Contract Address Details

0x32c6379B2978A9aB75993cA82e3ADc77dd50010C

Contract Name
DistributionToDelegators
Creator
0x4598a6–d10d29 at 0x933339–c29f60
Balance
0 FLR
Tokens
Fetching tokens...
Transactions
1 Transactions
Transfers
0 Transfers
Gas Used
27,962
Last Balance Update
3077699
Contract name:
DistributionToDelegators




Optimization enabled
true
Compiler version
v0.7.6+commit.7338295f




Optimization runs
200
Verified at
2022-07-13T21:20:21.877257Z

Constructor Arguments

0000000000000000000000004598a6c05910ab914f0cbaaca1911cd337d10d29000000000000000000000000baf89d873d198ff78e72d2745b01cba3c6e5be6b000000000000000000000000100000000000000000000000000000000000000300000000000000000000000010000000000000000000000000000000000000040000000000000000000000000000000000000000476a3d4ef278dc3746d6bac00000000000000000000000000000000000000000000000000000000064602480

Arg [0] (address) : 0x4598a6c05910ab914f0cbaaca1911cd337d10d29
Arg [1] (address) : 0xbaf89d873d198ff78e72d2745b01cba3c6e5be6b
Arg [2] (address) : 0x1000000000000000000000000000000000000003
Arg [3] (address) : 0x1000000000000000000000000000000000000004
Arg [4] (uint256) : 22101871354868100254035000000
Arg [5] (uint256) : 1684022400

              

./contracts/tokenPools/implementation/DistributionToDelegators.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "../../addressUpdater/implementation/AddressUpdatable.sol";
import "../../governance/implementation/Governed.sol";
import "../../inflation/implementation/Supply.sol";
import "../../personalDelegation/implementation/DelegationAccountManager.sol";
import "../../token/implementation/WNat.sol";
import "../../utils/implementation/SafePct.sol";
import "@openzeppelin/contracts/math/Math.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "../../userInterfaces/IDistributionToDelegators.sol";
import "../../userInterfaces/IPriceSubmitter.sol";
import "../interface/IITokenPool.sol";
import "../../genesis/implementation/DistributionTreasury.sol";
import "../../utils/implementation/AddressSet.sol";

/**
 * @title Distribution to delegators
 * @notice A contract to manage the ongoing airdrop distribution after the initial airdrop allocation.
 * The remaining amount is distributed by this contract, with a set rate every 30 days
 * @notice The balance that will be added to this contract must initially be a part of circulating supply
 **/
//solhint-disable-next-line max-states-count
contract DistributionToDelegators is IDistributionToDelegators, IITokenPool,
    Governed, ReentrancyGuard, AddressUpdatable
{
    using SafeMath for uint256;
    using SafePct for uint256;
    using AddressSet for AddressSet.State;

    // constants
    uint256 internal constant WEEK = 7 days;
    uint256 internal constant MONTH = 30 days;
    uint256 internal constant NUMBER_OF_VOTE_POWER_BLOCKS = 3;
    uint256 internal constant TOTAL_CLAIMABLE_BIPS = 8500;
    // 2.37% every 30 days (so total distribution takes 36 * 30 days =~ 3 years)
    uint256 internal constant MONTHLY_CLAIMABLE_BIPS = 237;
    uint256 internal constant NUMBER_OF_MONTHS = TOTAL_CLAIMABLE_BIPS / MONTHLY_CLAIMABLE_BIPS + 1; // 36

    // Errors
    string internal constant ERR_ADDRESS_ZERO = "address zero";
    string internal constant ERR_BALANCE_TOO_LOW = "balance too low";
    string internal constant ERR_IN_THE_PAST = "in the past";
    string internal constant ERR_NOT_STARTED = "not started";
    string internal constant ERR_ALREADY_FINISHED = "already finished";
    string internal constant ERR_MONTH_EXPIRED = "month expired";
    string internal constant ERR_MONTH_NOT_CLAIMABLE = "month not claimable";
    string internal constant ERR_MONTH_NOT_CLAIMABLE_YET = "month not claimable yet";
    string internal constant ERR_CLAIM_FAILED = "claim failed";
    string internal constant ERR_OPT_OUT = "already opted out";
    string internal constant ERR_NOT_OPT_OUT = "not opted out";
    string internal constant ERR_DELEGATION_ACCOUNT_ZERO = "delegation account zero";
    string internal constant ERR_TREASURY_ONLY = "treasury only";
    string internal constant ERR_ALREADY_STARTED = "already started";
    string internal constant ERR_WRONG_START_TIMESTAMP = "wrong start timestamp";
    string internal constant ERR_EXECUTOR_ONLY = "claim executor only";
    string internal constant ERR_RECIPIENT_NOT_ALLOWED = "recipient not allowed";

    // storage
    uint256 public totalEntitlementWei;     // Total wei to be distributed (all but initial airdrop)
    uint256 public immutable latestEntitlementStartTs;  // Latest day 0 when contract starts
    uint256 public totalClaimedWei;         // All wei already claimed
    uint256 public totalBurnedWei;          // Amounts that were not claimed in time and expired and was burned
    uint256 public totalDistributableAmount;// Total amount that was pulled from Distribution treasury for 
                                            // distribution. (sum of totalAvailableAmount)
    uint256 public entitlementStartTs;      // Day 0 when contract starts
    // id of the first month to expire. Closed = expired and unclaimed amount will be redistributed
    uint256 internal nextMonthToExpireCandidate;

    mapping(uint256 => uint256) public startBlockNumber; // mapping from month to first block used in randomization
    mapping(uint256 => uint256) public endBlockNumber; // mapping from month to last block used in randomization
    mapping(uint256 => uint256[]) public votePowerBlockNumbers; // mapping from month to blocks used in claiming 
    mapping(uint256 => uint256) public totalAvailableAmount; // mapping from month to total available amount
    mapping(uint256 => uint256) public totalUnclaimedAmount; // mapping from month to unclaimed amount
    mapping(uint256 => uint256) public totalUnclaimedWeight; // mapping from month to weight of unclaimed amount
    mapping(address => mapping(uint256 => uint256)) internal claimed; // mapping from address to claimed amount / month

    mapping(address => bool) public optOutCandidate; // indicates if user has triggered to opt out of airdrop
    mapping(address => bool) public optOut; // indicates if user is opted out of airdrop (confirmed by governance)
    address[] public optOutAddresses; // all opted out addresses (confirmed by governance)
    bool public stopped;

    // mapping reward owner address => executor set
    mapping(address => AddressSet.State) private claimExecutorSet;
    
    // mapping reward owner address => claim recipient address
    mapping(address => AddressSet.State) private allowedClaimRecipientSet;

    // contracts
    IPriceSubmitter public immutable priceSubmitter;
    DistributionTreasury public immutable treasury;
    WNat public wNat;
    Supply public supply;
    DelegationAccountManager public delegationAccountManager;

    /**
     * @dev This modifier ensures that this contract's balance matches the expected balance.
     */
    modifier mustBalance {
        _;
        require (_getExpectedBalance() <= address(this).balance, ERR_BALANCE_TOO_LOW);
    }

    modifier onlyRewardExecutorAndAllowedRecipient(address _rewardOwner, address _recipient) {
        _checkExecutorAndAllowedRecipient(_rewardOwner, _recipient);
        _;
    }

    /**
     * @dev This modifier ensures that the entitelment was already started
     */
    modifier entitlementStarted {
        require (entitlementStartTs < block.timestamp, ERR_NOT_STARTED);
        _;
    }

    constructor(
        address _governance,
        address _addressUpdater,
        IPriceSubmitter _priceSubmitter,
        DistributionTreasury _treasury,
        uint256 _totalEntitlementWei,
        uint256 _latestEntitlementStartTs
    )
        Governed(_governance) AddressUpdatable(_addressUpdater)
    {
        require(address(_priceSubmitter) != address(0), ERR_ADDRESS_ZERO);
        require(address(_treasury) != address(0), ERR_ADDRESS_ZERO);
        require(address(_treasury).balance >= _totalEntitlementWei, ERR_BALANCE_TOO_LOW);
        require(_latestEntitlementStartTs >= block.timestamp, ERR_IN_THE_PAST);
        priceSubmitter = _priceSubmitter;
        treasury = _treasury;
        totalEntitlementWei = _totalEntitlementWei;
        latestEntitlementStartTs = _latestEntitlementStartTs;
        entitlementStartTs = _latestEntitlementStartTs;
        emit EntitlementStart(_latestEntitlementStartTs);
    }

    /**
     * @notice Needed in order to receive funds from DistributionTreasury
     */
    receive() external payable {
        require(msg.sender == address(treasury), ERR_TREASURY_ONLY);
    }

    function stop() external onlyGovernance {
        stopped = true;
    }

    /**
     * @notice Update the totalEntitlementWei
     */
    function updateTotalEntitlementWei() external onlyGovernance {
        uint256 newTotalEntitlementWei = totalDistributableAmount.add(address(treasury).balance);
        assert(newTotalEntitlementWei >= totalEntitlementWei);
        totalEntitlementWei = newTotalEntitlementWei;
    }

    /**
     * @notice Start the distribution contract at _entitlementStartTs timestamp
     * @param _entitlementStartTs point in time when we start
     */
    function setEntitlementStart(uint256 _entitlementStartTs) external onlyGovernance {
        require(entitlementStartTs > block.timestamp, ERR_ALREADY_STARTED);
        require(_entitlementStartTs >= block.timestamp && _entitlementStartTs <= latestEntitlementStartTs,
            ERR_WRONG_START_TIMESTAMP);
        entitlementStartTs = _entitlementStartTs;
        emit EntitlementStart(_entitlementStartTs);
    }

    /**
     * @notice Method to opt-out of receiving airdrop rewards
     */
    function optOutOfAirdrop() external override {
        require(!optOutCandidate[msg.sender], ERR_OPT_OUT);
        optOutCandidate[msg.sender] = true;
        // emit opt out event
        emit AccountOptOut(msg.sender, false);
    }

    /**
     * @notice Confirm opt out addresses
     * @param _optOutAddresses addresses to opt out
     */
    function confirmOptOutOfAirdrop(address[] calldata _optOutAddresses) external onlyGovernance {
        uint256 len = _optOutAddresses.length;
        for (uint256 i = 0; i < len; i++) {
            address optOutAddress = _optOutAddresses[i];
            require(optOutCandidate[optOutAddress], ERR_NOT_OPT_OUT);
            require(!optOut[optOutAddress], ERR_OPT_OUT);
            optOut[optOutAddress] = true;
            optOutAddresses.push(optOutAddress);
            // emit opt out event
            emit AccountOptOut(optOutAddress, true);
        }
    }

    /**
     * Set the addresses of executors, who are allowed to call claimByExecutor, claimAndWrapByExecutor
     * and claimToPersonalDelegationAccountByExecutor.
     * @param _executors The new executors. All old executors will be deleted and replaced by these.
     */    
    function setClaimExecutors(address[] memory _executors) external override {
        claimExecutorSet[msg.sender].replaceAll(_executors);
        emit ClaimExecutorsChanged(msg.sender, _executors);
    }
    
    /**
     * Set the addresses of allowed recipients in the methods claimByExecutor and claimAndWrapByExecutor.
     * Apart from these, the reward owner is always an allowed recipient.
     * @param _recipients The new allowed recipients. All old recipients will be deleted and replaced by these.
     */    
    function setAllowedClaimRecipients(address[] memory _recipients) external override {
        allowedClaimRecipientSet[msg.sender].replaceAll(_recipients);
        emit AllowedClaimRecipientsChanged(msg.sender, _recipients);
    }

    /**
     * @notice Method for claiming unlocked airdrop amounts for specified month
     * @param _recipient address representing the recipient of the reward
     * @param _month month of interest
     * @return _amountWei claimed wei
     */
    function claim(address _recipient, uint256 _month) external override 
        entitlementStarted mustBalance nonReentrant
        returns(uint256 _amountWei)
    {
        return _claimOrWrap(msg.sender, _recipient, _month, false);
    }

    /**
     * @notice Method for claiming and wrapping unlocked airdrop amounts for specified month
     * @param _recipient address representing the recipient of the reward
     * @param _month month of interest
     * @return _amountWei claimed wei
     */
    function claimAndWrap(address _recipient, uint256 _month) external override 
        entitlementStarted mustBalance nonReentrant
        returns(uint256 _amountWei)
    {
        return _claimOrWrap(msg.sender, _recipient, _month, true);
    }

    /**
     * @notice Method for claiming unlocked airdrop amounts for specified month by executor
     * @param _rewardOwner address of the reward owner
     * @param _recipient address representing the recipient of the reward
     * @param _month month of interest
     * @return _amountWei claimed wei
     */
    function claimByExecutor(address _rewardOwner, address _recipient, uint256 _month) external override 
        entitlementStarted mustBalance nonReentrant
        onlyRewardExecutorAndAllowedRecipient(_rewardOwner, _recipient)
        returns(uint256 _amountWei)
    {
        return _claimOrWrap(_rewardOwner, _recipient, _month, false);
    }

    /**
     * @notice Method for claiming and wrapping unlocked airdrop amounts for specified month by executor
     * @param _rewardOwner address of the reward owner
     * @param _recipient address representing the recipient of the reward
     * @param _month month of interest
     * @return _amountWei claimed wei
     */
    function claimAndWrapByExecutor(address _rewardOwner, address _recipient, uint256 _month) external override 
        entitlementStarted mustBalance nonReentrant
        onlyRewardExecutorAndAllowedRecipient(_rewardOwner, _recipient)
        returns(uint256 _amountWei)
    {
        return _claimOrWrap(_rewardOwner, _recipient, _month, true);
    }

    /**
     * @notice Method for claiming unlocked airdrop amounts for specified month to personal delegation account
     * @param _month month of interest
     * @return _amountWei claimed wei
     */
    function claimToPersonalDelegationAccount(uint256 _month) external override 
        entitlementStarted mustBalance nonReentrant
        returns(uint256 _amountWei)
    {
        address delegationAccount = delegationAccountManager.accountToDelegationAccount(msg.sender);
        require(delegationAccount != address(0), ERR_DELEGATION_ACCOUNT_ZERO);
        return _claimOrWrap(msg.sender, delegationAccount, _month, false);
    }

    /**
     * @notice Method for claiming unlocked airdrop amounts for rewardOwner and specified month
     *         to personal delegation account by executor
     * @param _rewardOwner address of the reward owner
     * @param _month month of interest
     * @return _amountWei claimed wei
     */
    function claimToPersonalDelegationAccountByExecutor(address _rewardOwner, uint256 _month) external override 
        entitlementStarted mustBalance nonReentrant
        returns(uint256 _amountWei)
    {
        require(claimExecutorSet[_rewardOwner].index[msg.sender] != 0, ERR_EXECUTOR_ONLY);
        address delegationAccount = delegationAccountManager.accountToDelegationAccount(_rewardOwner);
        require(delegationAccount != address(0), ERR_DELEGATION_ACCOUNT_ZERO);
        return _claimOrWrap(_rewardOwner, delegationAccount, _month, false);
    }

    /**
     * @notice Return token pool supply data
     * @return _lockedFundsWei                  Foundation locked funds (wei)
     * @return _totalInflationAuthorizedWei     Total inflation authorized amount (wei)
     * @return _totalClaimedWei                 Total claimed amount (wei)
     */
    function getTokenPoolSupplyData() external override mustBalance nonReentrant
        returns (uint256 _lockedFundsWei, uint256 _totalInflationAuthorizedWei, uint256 _totalClaimedWei)
    {
        // update only if called from supply
        // update start and end block numbers, calculate random vote power blocks, expire too old month, pull funds
        if (msg.sender == address(supply)) {
            _updateMonthlyClaimData();
        }

        // This is the total amount of tokens that are actually already in circulating supply
        _lockedFundsWei = stopped ? totalDistributableAmount : totalEntitlementWei;
        // We will never increase this balance since distribution funds are taken from genesis
        // amounts and not from inflation.
        _totalInflationAuthorizedWei = 0;
        // What was actually already added to circulating supply
        _totalClaimedWei = totalClaimedWei.add(totalBurnedWei);
    }

    /**
     * @notice get claimable amount of wei for requesting account for specified month
     * @param _month month of interest
     * @return _amountWei amount of wei available for this account and provided month
     */
    function getClaimableAmount(uint256 _month) external view override entitlementStarted
        returns(uint256 _amountWei)
    {
        (, _amountWei) = _getClaimableWei(msg.sender, _month);
    }

    /**
     * @notice get claimable amount of wei for account for specified month
     * @param _account the address of an account we want to get the claimable amount of wei
     * @param _month month of interest
     * @return _amountWei amount of wei available for provided account and month
     */
    function getClaimableAmountOf(address _account, uint256 _month) external view override entitlementStarted
        returns(uint256 _amountWei)
    {
        (, _amountWei) = _getClaimableWei(_account, _month);
    }

    /**
     * @notice get claimable amount of wei for requesting account for specified month
     * @param _month month of interest
     * @return _amountWei amount of wei claimed for this account and provided month
     */
    function getClaimedAmount(uint256 _month) external view override entitlementStarted
        returns(uint256 _amountWei)
    {
        return claimed[msg.sender][_month];
    }

    /**
     * @notice get claimed amount of wei for account for specified month
     * @param _account the address of an account we want to get the claimable amount of wei
     * @param _month month of interest
     * @return _amountWei amount of wei claimed for provided account and month
     */
    function getClaimedAmountOf(address _account, uint256 _month) external view override entitlementStarted
        returns(uint256 _amountWei)
    {
        return claimed[_account][_month];
    }

    /**
     * @notice Time till next Wei will be claimable (in secods)
     * @return _timeTill (sec) Time till next claimable Wei in seconds
     */
    function secondsTillNextClaim() external view override entitlementStarted
        returns(uint256 _timeTill)
    {
        require(block.timestamp.sub(entitlementStartTs).div(MONTH) < NUMBER_OF_MONTHS, ERR_ALREADY_FINISHED);
        return MONTH.sub(block.timestamp.sub(entitlementStartTs).mod(MONTH));
    }
    
    /**
     * Get the addresses of executors, who are allowed to call claimByExecutor, claimAndWrapByExecutor
     * and claimToPersonalDelegationAccountByExecutor.
     */    
    function claimExecutors(address _rewardOwner) external view override returns (address[] memory) {
        return claimExecutorSet[_rewardOwner].list;
    }

    /**
     * Get the addresses of allowed recipients in the methods claimByExecutor and claimAndWrapByExecutor.
     * Apart from these, the reward owner is always an allowed recipient.
     */    
    function allowedClaimRecipients(address _rewardOwner) external view override returns (address[] memory) {
        return allowedClaimRecipientSet[_rewardOwner].list;
    }

    /**
     * @notice Returns the current month
     * @return _currentMonth Current month, 0 before entitlementStartTs
     */
    function getCurrentMonth() public view override returns (uint256 _currentMonth) {
        (, uint256 diffSec) = block.timestamp.trySub(entitlementStartTs);
        return diffSec.div(MONTH);
    }

    /**
     * @notice Returns the month that will expire next
     * @return _monthToExpireNext Month that will expire next, 36 when last month expired
     */
    function getMonthToExpireNext() public view override returns (uint256 _monthToExpireNext) {
        uint256 cleanupBlockNumber = wNat.cleanupBlockNumber();
        uint256 blockNumber = startBlockNumber[nextMonthToExpireCandidate];
        if (blockNumber > 0 && blockNumber < cleanupBlockNumber) return nextMonthToExpireCandidate + 1;
        return nextMonthToExpireCandidate;
    }

    ///////////////////////////////////////////////////////////////////////////////////////////////
    // Update contracts

    /**
     * @notice Implementation of the AddressUpdatable abstract method.
     */
    function _updateContractAddresses(
        bytes32[] memory _contractNameHashes,
        address[] memory _contractAddresses
    )
        internal override
    {
        wNat = WNat(payable(_getContractAddress(_contractNameHashes, _contractAddresses, "WNat")));
        supply = Supply(_getContractAddress(_contractNameHashes, _contractAddresses, "Supply"));
        delegationAccountManager = DelegationAccountManager(
            _getContractAddress(_contractNameHashes, _contractAddresses, "DelegationAccountManager"));
    }

    ///////////////////////////////////////////////////////////////////////////////////////////////
    // Helpers

    /**
     * @notice Method for claiming unlocked airdrop amounts for specified month
     * @param _rewardOwner address of the owner of airdrop rewards
     * @param _recipient address representing the recipient of the reward
     * @param _month month of interest
     */
    function _claimOrWrap(
        address _rewardOwner,
        address _recipient,
        uint256 _month,
        bool _wrap
    )
        internal returns(uint256)
    {
        (uint256 weight, uint256 claimableWei) = _getClaimableWei(_rewardOwner, _month);
        // Make sure we are not withdrawing 0 funds
        if (claimableWei > 0) {
            claimed[_rewardOwner][_month] = claimableWei;
            // Update grand total claimed
            totalClaimedWei = totalClaimedWei.add(claimableWei);
            totalUnclaimedAmount[_month] = totalUnclaimedAmount[_month].sub(claimableWei);
            totalUnclaimedWeight[_month] = totalUnclaimedWeight[_month].sub(weight);

            if (_wrap) {
                _wrapFunds(_recipient, claimableWei);
            } else {
                _transferFunds(_recipient, claimableWei);
            }
            // Emit the claim event
            emit AccountClaimed(_rewardOwner, _recipient, _month, claimableWei);
        }
        return claimableWei;
    }

    /**
     * @notice Wrap (deposit) `_claimableAmount` to `_recipient` on WNat.
     * @param _recipient            address representing the reward recipient
     * @param _claimableAmount      number representing the amount to transfer
     */
    function _wrapFunds(address _recipient, uint256 _claimableAmount) internal {
        // transfer total amount (state is updated and events are emitted in _claimOrWrap)
        //slither-disable-next-line arbitrary-send          // amount always calculated by _claimOrWrap
        wNat.depositTo{value: _claimableAmount}(_recipient);
    }

    /**
     * @notice Transfers `_claimableAmount` to `_recipient`.
     * @param _recipient            address representing the reward recipient
     * @param _claimableAmount      number representing the amount to transfer
     * @dev Uses low level call to transfer funds.
     */
    function _transferFunds(address _recipient, uint256 _claimableAmount) internal {
        // transfer total amount (state is updated and events are emitted in _claimOrWrap)
        /* solhint-disable avoid-low-level-calls */
        //slither-disable-next-line arbitrary-send          // amount always calculated by _claimOrWrap
        (bool success, ) = _recipient.call{value: _claimableAmount}("");
        /* solhint-enable avoid-low-level-calls */
        require(success, ERR_CLAIM_FAILED);
    }

    /**
     * @notice Update start and end block numbers, calculate random vote power blocks, expire too old month, pull funds
     * @dev Only do some updates if distribution already started and not yet expired
     */
     //slither-disable-next-line reentrancy-eth          // guarded by nonReentrant in getTokenPoolSupplyData()
    function _updateMonthlyClaimData() internal {
        if (entitlementStartTs == 0 || entitlementStartTs > block.timestamp 
            || nextMonthToExpireCandidate >= NUMBER_OF_MONTHS) return;

        uint256 diffSec = block.timestamp.sub(entitlementStartTs);
        uint256 currentMonth = diffSec.div(MONTH);
        
        // can be called multiple times per block - update only needed once
        if (endBlockNumber[currentMonth] == block.number) return;

        uint256 remainingSec = diffSec - currentMonth * MONTH;
        uint256 currentWeek = remainingSec.div(WEEK);

        // if not the first week, which is left out for claiming, update start/end blocks
        if (currentWeek > 0 && currentMonth < NUMBER_OF_MONTHS) {
            // set starting block if not set yet
            if (startBlockNumber[currentMonth] == 0) {
                startBlockNumber[currentMonth] = block.number;
            }
            // update ending block
            endBlockNumber[currentMonth] = block.number;
        }

        // expire old month
        uint256 cleanupBlockNumber = wNat.cleanupBlockNumber();
        uint256 blockNumber = startBlockNumber[nextMonthToExpireCandidate];
        if (blockNumber > 0 && blockNumber < cleanupBlockNumber) {
            uint256 toBurnWei = totalUnclaimedAmount[nextMonthToExpireCandidate];
            nextMonthToExpireCandidate++;

            // Any to burn?
            if (toBurnWei > 0) {
                // Accumulate what we are about to burn
                totalBurnedWei = totalBurnedWei.add(toBurnWei);
                // Get the burn address; make it payable
                address payable burnAddress = payable(supply.burnAddress());
                //slither-disable-next-line arbitrary-send
                burnAddress.transfer(toBurnWei);
            }
        }

        // if in the last week, calculate votePowerBlocks and pull amount
        // it could be called twice - just to be sure it is called at least once
        if (currentWeek == 4 && currentMonth < NUMBER_OF_MONTHS && !stopped) {
            _updateVotePowerBlocksAndWeight(currentMonth);
            _updateDistributableAmount(currentMonth);
        }
    }
    
    /**
     * @notice Calculate and pull the distributable amount for the specified month
     * @param _month month of interest
     * @dev Every 30 days from initial day 1/36 of the total amount is unlocked and becomes available for claiming
     *      This method could be called more than once per month, so take care to only pull once
     */
    function _updateDistributableAmount(uint256 _month) internal {
        if (_month < NUMBER_OF_MONTHS && totalAvailableAmount[_month] == 0) {
            // maximal claimable bips for this month
            uint256 claimBIPS = Math.min((_month + 1).mul(MONTHLY_CLAIMABLE_BIPS), TOTAL_CLAIMABLE_BIPS);
            // what can be distributed minus what was already distributed till now
            uint256 amountWei = Math.min(Math.min(
                totalEntitlementWei.mulDiv(claimBIPS, TOTAL_CLAIMABLE_BIPS) - totalDistributableAmount,
                treasury.MAX_PULL_AMOUNT_WEI()),
                address(treasury).balance);
            // update total values
            totalAvailableAmount[_month] = amountWei;
            totalUnclaimedAmount[_month] = amountWei;
            totalDistributableAmount += amountWei;
            // pull funds
            treasury.pullFunds(amountWei);
        }
    }

    /**
     * @notice Calculate random vote power blocks and weight for the specified month
     * @param _month month of interest
     * @dev Can be called more than once per month, last call for specified month should apply
     */
    function _updateVotePowerBlocksAndWeight(uint256 _month) internal {
        uint256 startBlock = startBlockNumber[_month];
        uint256 endBlock = endBlockNumber[_month];
        // no underflow as both are set at the same time, only endBlock can be updated later
        uint256 slotSize = (endBlock - startBlock) / NUMBER_OF_VOTE_POWER_BLOCKS;

        uint256[] memory votePowerBlocks = new uint256[](NUMBER_OF_VOTE_POWER_BLOCKS);
        uint256 random = block.timestamp + priceSubmitter.getCurrentRandom();
        for (uint256 i = 0; i < NUMBER_OF_VOTE_POWER_BLOCKS; i++) {
            random = uint256(keccak256(abi.encode(random, i)));
            //slither-disable-next-line weak-prng
            uint256 votePowerBlock = startBlock + i * slotSize + random % slotSize;
            votePowerBlocks[i] = votePowerBlock;
        }
        votePowerBlockNumbers[_month] = votePowerBlocks;
        totalUnclaimedWeight[_month] = _calculateUnclaimedWeight(votePowerBlocks);
    }

    /**
     * @notice Get the total unclaimed weight for the specified vote power blocks
     * @param _votePowerBlocks array of vote power blocks of interest
     * @return _amountWei unclaimed weight of wei at vote power blocks
     */
    function _calculateUnclaimedWeight(uint256[] memory _votePowerBlocks) internal view returns (uint256 _amountWei) {
        for (uint256 i = 0; i < NUMBER_OF_VOTE_POWER_BLOCKS; i++) {
            _amountWei += wNat.totalSupplyAt(_votePowerBlocks[i]);
        }
        uint256 len = optOutAddresses.length;
        while (len > 0) {
            len--;
            address optOutAddress = optOutAddresses[len];
            for (uint256 i = 0; i < NUMBER_OF_VOTE_POWER_BLOCKS; i++) {
                _amountWei -= wNat.balanceOfAt(optOutAddress, _votePowerBlocks[i]);
            }
        }
    }

    /**
     * @notice Get weight and claimable amount for users account for the specified month
     * @param _owner address of interest
     * @param _month month of interest
     * @dev Every 30 days from initial day 1/36 of the amount is released
     */
    function _getClaimableWei(address _owner, uint256 _month) internal view entitlementStarted
        returns(uint256 _weight, uint256 _claimableWei)
    {
        require(!optOut[_owner], ERR_OPT_OUT);
        require(getMonthToExpireNext() <= _month, ERR_MONTH_EXPIRED);
        require(_month < NUMBER_OF_MONTHS, ERR_MONTH_NOT_CLAIMABLE);
        require(_month < getCurrentMonth(), ERR_MONTH_NOT_CLAIMABLE_YET);

        if (claimed[_owner][_month] > 0) {
            return (0, 0);
        }

        uint256 unclaimedAmount = totalUnclaimedAmount[_month];
        if (unclaimedAmount == 0) {
            return (0, 0);
        }

        uint256[] memory votePowerBlocks = votePowerBlockNumbers[_month];
        for (uint256 i = 0; i < NUMBER_OF_VOTE_POWER_BLOCKS; i++) {
            _weight += wNat.balanceOfAt(_owner, votePowerBlocks[i]);
        }
        if (_weight == 0) {
            return (0, 0);
        }

        uint256 unclaimedWeight = totalUnclaimedWeight[_month];
        if (_weight == unclaimedWeight) {
            return (_weight, unclaimedAmount);
        }
        assert(_weight < unclaimedWeight);
        return (_weight, unclaimedAmount.mulDiv(_weight, unclaimedWeight));
    }

    function _checkExecutorAndAllowedRecipient(address _rewardOwner, address _recipient) private view {
        require(claimExecutorSet[_rewardOwner].index[msg.sender] != 0, 
            ERR_EXECUTOR_ONLY);
        require(_recipient == _rewardOwner || allowedClaimRecipientSet[_rewardOwner].index[_recipient] != 0,
            ERR_RECIPIENT_NOT_ALLOWED);
    }

    /**
     * @notice Compute the expected balance of this contract.
     * @param _balanceExpectedWei The computed balance expected.
     */
    function _getExpectedBalance() private view returns(uint256 _balanceExpectedWei) {
        return totalDistributableAmount.sub(totalClaimedWei).sub(totalBurnedWei);
    }
}
        

@openzeppelin/contracts/utils/Context.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
          

./contracts/token/implementation/VPContract.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "../../governance/implementation/GovernedBase.sol";
import "./Delegatable.sol";
import "../interface/IIVPContract.sol";
import "../interface/IIVPToken.sol";
import "../../userInterfaces/IVPToken.sol";

contract VPContract is IIVPContract, Delegatable {
    using SafeMath for uint256;
    
    /**
     * The VPToken (or some other contract) that owns this VPContract.
     * All state changing methods may be called only from this address.
     * This is because original msg.sender is sent in `_from` parameter
     * and we must be sure that it cannot be faked by directly calling VPContract.
     * Owner token is also used in case of replacement to recover vote powers from balances.
     */
    IVPToken public immutable override ownerToken;
    
    /**
     * Return true if this IIVPContract is configured to be used as a replacement for other contract.
     * It means that vote powers are not necessarily correct at the initialization, therefore
     * every method that reads vote power must check whether it is initialized for that address and block.
     */
    bool public immutable override isReplacement;

    // The block number when vote power for an address was first set.
    // Reading vote power before this block would return incorrect result and must revert.
    mapping (address => uint256) private votePowerInitializationBlock;

    // Vote power cache for past blocks when vote power was not initialized.
    // Reading vote power at that block would return incorrect result, so cache must be set by some other means.
    // No need for revocation info, since there can be no delegations at such block.
    mapping (bytes32 => uint256) private uninitializedVotePowerCache;
    
    string constant private ALREADY_EXPLICIT_MSG = "Already delegated explicitly";
    string constant private ALREADY_PERCENT_MSG = "Already delegated by percentage";
    
    string constant internal VOTE_POWER_NOT_INITIALIZED = "Vote power not initialized";

    /**
     * All external methods in VPContract can only be executed by the owner token.
     */
    modifier onlyOwnerToken {
        require(msg.sender == address(ownerToken), "only owner token");
        _;
    }

    modifier onlyPercent(address sender) {
        // If a delegate cannot be added by percentage, revert.
        require(_canDelegateByPct(sender), ALREADY_EXPLICIT_MSG);
        _;
    }

    modifier onlyExplicit(address sender) {
        // If a delegate cannot be added by explicit amount, revert.
        require(_canDelegateByAmount(sender), ALREADY_PERCENT_MSG);
        _;
    }

    /**
     * Construct VPContract for given VPToken.
     */
    constructor(IVPToken _ownerToken, bool _isReplacement) {
        require(address(_ownerToken) != address(0), "VPContract must belong to a VPToken");
        ownerToken = _ownerToken;
        isReplacement = _isReplacement;
    }
    
    /**
     * Set the cleanup block number.
     * Historic data for the blocks before `cleanupBlockNumber` can be erased,
     * history before that block should never be used since it can be inconsistent.
     * In particular, cleanup block number must be before current vote power block.
     * The method can be called only by the owner token.
     * @param _blockNumber The new cleanup block number.
     */
    function setCleanupBlockNumber(uint256 _blockNumber) external override onlyOwnerToken {
        _setCleanupBlockNumber(_blockNumber);
    }

    /**
     * Set the contract that is allowed to call history cleaning methods.
     * The method can be called only by the owner token.
     */
    function setCleanerContract(address _cleanerContract) external override onlyOwnerToken {
        _setCleanerContract(_cleanerContract);
    }
    
    /**
     * Update vote powers when tokens are transfered.
     * Also update delegated vote powers for percentage delegation
     * and check for enough funds for explicit delegations.
     **/
    function updateAtTokenTransfer(
        address _from, 
        address _to, 
        uint256 _fromBalance,
        uint256 _toBalance,
        uint256 _amount
    )
        external override 
        onlyOwnerToken 
    {
        if (_from == address(0)) {
            // mint new vote power
            _initializeVotePower(_to, _toBalance);
            _mintVotePower(_to, _toBalance, _amount);
        } else if (_to == address(0)) {
            // burn vote power
            _initializeVotePower(_from, _fromBalance);
            _burnVotePower(_from, _fromBalance, _amount);
        } else {
            // transmit vote power _to receiver
            _initializeVotePower(_from, _fromBalance);
            _initializeVotePower(_to, _toBalance);
            _transmitVotePower(_from, _to, _fromBalance, _toBalance, _amount);
        }
    }

    /**
     * @notice Delegate `_bips` percentage of voting power to `_to` from `_from`
     * @param _from The address of the delegator
     * @param _to The address of the recipient
     * @param _balance The delegator's current balance
     * @param _bips The percentage of voting power to be delegated expressed in basis points (1/100 of one percent).
     *   Not cummulative - every call resets the delegation value (and value of 0 revokes delegation).
     **/
    function delegate(
        address _from, 
        address _to, 
        uint256 _balance, 
        uint256 _bips
    )
        external override 
        onlyOwnerToken 
        onlyPercent(_from)
    {
        _initializeVotePower(_from, _balance);
        if (!_votePowerInitialized(_to)) {
            _initializeVotePower(_to, ownerToken.balanceOf(_to));
        }
        _delegateByPercentage(_from, _to, _balance, _bips);
    }
    
    /**
     * @notice Explicitly delegate `_amount` of voting power to `_to` from `_from`.
     * @param _from The address of the delegator
     * @param _to The address of the recipient
     * @param _balance The delegator's current balance
     * @param _amount An explicit vote power amount to be delegated.
     *   Not cummulative - every call resets the delegation value (and value of 0 undelegates `to`).
     **/    
    function delegateExplicit(
        address _from, 
        address _to, 
        uint256 _balance, 
        uint _amount
    )
        external override 
        onlyOwnerToken
        onlyExplicit(_from)
    {
        _initializeVotePower(_from, _balance);
        if (!_votePowerInitialized(_to)) {
            _initializeVotePower(_to, ownerToken.balanceOf(_to));
        }
        _delegateByAmount(_from, _to, _balance, _amount);
    }

    /**
     * @notice Revoke all delegation from `_from` to `_to` at given block. 
     *    Only affects the reads via `votePowerOfAtCached()` in the block `_blockNumber`.
     *    Block `_blockNumber` must be in the past. 
     *    This method should be used only to prevent rogue delegate voting in the current voting block.
     *    To stop delegating use delegate/delegateExplicit with value of 0 or undelegateAll/undelegateAllExplicit.
     * @param _from The address of the delegator
     * @param _to Address of the delegatee
     * @param _balance The delegator's current balance
     * @param _blockNumber The block number at which to revoke delegation.
     **/
    function revokeDelegationAt(
        address _from, 
        address _to, 
        uint256 _balance,
        uint _blockNumber
    )
        external override 
        onlyOwnerToken
    {
        // ASSERT: if there was a delegation, _from and _to must be initialized
        if (!isReplacement || 
            (_votePowerInitializedAt(_from, _blockNumber) && _votePowerInitializedAt(_to, _blockNumber))) {
            _revokeDelegationAt(_from, _to, _balance, _blockNumber);
        }
    }

    /**
     * @notice Undelegate all voting power for delegates of `_from`
     *    Can only be used with percentage delegation.
     *    Does not reset delegation mode back to NOTSET.
     * @param _from The address of the delegator
     **/
    function undelegateAll(
        address _from,
        uint256 _balance
    )
        external override 
        onlyOwnerToken 
        onlyPercent(_from)
    {
        if (_hasAnyDelegations(_from)) {
            // ASSERT: since there were delegations, _from and its targets must be initialized
            _undelegateAllByPercentage(_from, _balance);
        }
    }

    /**
     * @notice Undelegate all explicit vote power by amount delegates for `_from`.
     *    Can only be used with explicit delegation.
     *    Does not reset delegation mode back to NOTSET.
     * @param _from The address of the delegator
     * @param _delegateAddresses Explicit delegation does not store delegatees' addresses, 
     *   so the caller must supply them.
     * @return The amount still delegated (in case the list of delegates was incomplete).
     */
    function undelegateAllExplicit(
        address _from, 
        address[] memory _delegateAddresses
    )
        external override 
        onlyOwnerToken 
        onlyExplicit(_from) 
        returns (uint256)
    {
        if (_hasAnyDelegations(_from)) {
            // ASSERT: since there were delegations, _from and its targets must be initialized
            return _undelegateAllByAmount(_from, _delegateAddresses);
        }
        return 0;
    }
    
    /**
    * @notice Get the vote power of `_who` at block `_blockNumber`
    *   Reads/updates cache and upholds revocations.
    * @param _who The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_who` at `_blockNumber`.
    */
    function votePowerOfAtCached(address _who, uint256 _blockNumber) external override returns(uint256) {
        if (!isReplacement || _votePowerInitializedAt(_who, _blockNumber)) {
            // use standard method
            return _votePowerOfAtCached(_who, _blockNumber);
        } else {
            // use uninitialized vote power cache
            bytes32 key = keccak256(abi.encode(_who, _blockNumber));
            uint256 cached = uninitializedVotePowerCache[key];
            if (cached != 0) {
                return cached - 1;  // safe, cached != 0
            }
            uint256 balance = ownerToken.balanceOfAt(_who, _blockNumber);
            uninitializedVotePowerCache[key] = balance.add(1);
            return balance;
        }
    }
    
    /**
     * Get the current cleanup block number.
     */
    function cleanupBlockNumber() external view override returns (uint256) {
        return _cleanupBlockNumber();
    }
    
    /**
     * @notice Get the current vote power of `_who`.
     * @param _who The address to get voting power.
     * @return Current vote power of `_who`.
     */
    function votePowerOf(address _who) external view override returns(uint256) {
        if (_votePowerInitialized(_who)) {
            return _votePowerOf(_who);
        } else {
            return ownerToken.balanceOf(_who);
        }
    }
    
    /**
    * @notice Get the vote power of `_who` at block `_blockNumber`
    * @param _who The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_who` at `_blockNumber`.
    */
    function votePowerOfAt(address _who, uint256 _blockNumber) public view override returns(uint256) {
        if (!isReplacement || _votePowerInitializedAt(_who, _blockNumber)) {
            return _votePowerOfAt(_who, _blockNumber);
        } else {
            return ownerToken.balanceOfAt(_who, _blockNumber);
        }
    }

    /**
    * @notice Get the vote power of `_who` at block `_blockNumber`, ignoring revocation information (and cache).
    * @param _who The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_who` at `_blockNumber`. Result doesn't change if vote power is revoked.
    */
    function votePowerOfAtIgnoringRevocation(address _who, uint256 _blockNumber) 
        external view override 
        returns(uint256) 
    {
        if (!isReplacement || _votePowerInitializedAt(_who, _blockNumber)) {
            return _votePowerOfAtIgnoringRevocation(_who, _blockNumber);
        } else {
            return ownerToken.balanceOfAt(_who, _blockNumber);
        }
    }
    
    /**
     * Return vote powers for several addresses in a batch.
     * @param _owners The list of addresses to fetch vote power of.
     * @param _blockNumber The block number at which to fetch.
     * @return _votePowers A list of vote powers corresponding to _owners.
     */    
    function batchVotePowerOfAt(
        address[] memory _owners, 
        uint256 _blockNumber
    )
        external view override 
        returns(uint256[] memory _votePowers)
    {
        _votePowers = _batchVotePowerOfAt(_owners, _blockNumber);
        // zero results might not have been initialized
        if (isReplacement) {
            for (uint256 i = 0; i < _votePowers.length; i++) {
                if (_votePowers[i] == 0 && !_votePowerInitializedAt(_owners[i], _blockNumber)) {
                    _votePowers[i] = ownerToken.balanceOfAt(_owners[i], _blockNumber);
                }
            }
        }
    }
    
    /**
    * @notice Get current delegated vote power `_from` delegator delegated `_to` delegatee.
    * @param _from Address of delegator
    * @param _to Address of delegatee
    * @param _balance The delegator's current balance
    * @return The delegated vote power.
    */
    function votePowerFromTo(
        address _from, 
        address _to, 
        uint256 _balance
    )
        external view override 
        returns (uint256)
    {
        // ASSERT: if the result is nonzero, _from and _to are initialized
        return _votePowerFromTo(_from, _to, _balance);
    }
    
    /**
    * @notice Get delegated the vote power `_from` delegator delegated `_to` delegatee at `_blockNumber`.
    * @param _from Address of delegator
    * @param _to Address of delegatee
    * @param _balance The delegator's current balance
    * @param _blockNumber The block number at which to fetch.
    * @return The delegated vote power.
    */
    function votePowerFromToAt(
        address _from, 
        address _to, 
        uint256 _balance,
        uint _blockNumber
    )
        external view override
        returns (uint256)
    {
        // ASSERT: if the result is nonzero, _from and _to were initialized at _blockNumber
        return _votePowerFromToAt(_from, _to, _balance, _blockNumber);
    }
    
    /**
     * @notice Get the delegation mode for '_who'. This mode determines whether vote power is
     *  allocated by percentage or by explicit value.
     * @param _who The address to get delegation mode.
     * @return Delegation mode (NOTSET=0, PERCENTAGE=1, AMOUNT=2))
     */
    function delegationModeOf(address _who) external view override returns (uint256) {
        return uint256(_delegationModeOf(_who));
    }

    /**
     * @notice Compute the current undelegated vote power of `_owner`
     * @param _owner The address to get undelegated voting power.
     * @param _balance Owner's current balance
     * @return The unallocated vote power of `_owner`
     */
    function undelegatedVotePowerOf(
        address _owner,
        uint256 _balance
    )
        external view override
        returns (uint256)
    {
        if (_votePowerInitialized(_owner)) {
            return _undelegatedVotePowerOf(_owner, _balance);
        } else {
            // ASSERT: there are no delegations
            return _balance;
        }
    }
    
    /**
     * @notice Get the undelegated vote power of `_owner` at given block.
     * @param _owner The address to get undelegated voting power.
     * @param _blockNumber The block number at which to fetch.
     * @return The undelegated vote power of `_owner` (= owner's own balance minus all delegations from owner)
     */
    function undelegatedVotePowerOfAt(
        address _owner, 
        uint256 _balance,
        uint256 _blockNumber
    )
        external view override
        returns (uint256)
    {
        if (_votePowerInitialized(_owner)) {
            return _undelegatedVotePowerOfAt(_owner, _balance, _blockNumber);
        } else {
            // ASSERT: there were no delegations at _blockNumber
            return _balance;
        }
    }

    /**
    * @notice Get the vote power delegation `_delegateAddresses` 
    *  and `pcts` of an `_owner`. Returned in two separate positional arrays.
    *  Also returns the count of delegates and delegation mode.
    * @param _owner The address to get delegations.
    * @return _delegateAddresses Positional array of delegation addresses.
    * @return _bips Positional array of delegation percents specified in basis points (1/100 or 1 percent)
    * @return _count The number of delegates.
    * @return _delegationMode The mode of the delegation (NOTSET=0, PERCENTAGE=1, AMOUNT=2).
    */
    function delegatesOf(address _owner)
        external view override 
        returns (
            address[] memory _delegateAddresses, 
            uint256[] memory _bips,
            uint256 _count,
            uint256 _delegationMode
        )
    {
        // ASSERT: either _owner is initialized or there are no delegations
        return delegatesOfAt(_owner, block.number);
    }
    
    /**
    * @notice Get the vote power delegation `delegationAddresses` 
    *  and `_bips` of an `_owner`. Returned in two separate positional arrays.
    *  Also returns the count of delegates and delegation mode.
    * @param _owner The address to get delegations.
    * @param _blockNumber The block for which we want to know the delegations.
    * @return _delegateAddresses Positional array of delegation addresses.
    * @return _bips Positional array of delegation percents specified in basis points (1/100 or 1 percent)
    * @return _count The number of delegates.
    * @return _delegationMode The mode of the delegation (NOTSET=0, PERCENTAGE=1, AMOUNT=2).
    */
    function delegatesOfAt(
        address _owner,
        uint256 _blockNumber
    )
        public view override 
        returns (
            address[] memory _delegateAddresses, 
            uint256[] memory _bips,
            uint256 _count,
            uint256 _delegationMode
        )
    {
        // ASSERT: either _owner was initialized or there were no delegations
        DelegationMode mode = _delegationModeOf(_owner);
        if (mode == DelegationMode.PERCENTAGE) {
            // Get the vote power delegation for the _owner
            (_delegateAddresses, _bips) = _percentageDelegatesOfAt(_owner, _blockNumber);
        } else if (mode == DelegationMode.NOTSET) {
            _delegateAddresses = new address[](0);
            _bips = new uint256[](0);
        } else {
            revert ("delegatesOf does not work in AMOUNT delegation mode");
        }
        _count = _delegateAddresses.length;
        _delegationMode = uint256(mode);
    }

    /**
     * Initialize vote power to current balance if not initialized already.
     * @param _owner The address to initialize voting power.
     * @param _balance The owner's current balance.
     */
    function _initializeVotePower(address _owner, uint256 _balance) internal {
        if (!isReplacement) return;
        if (_owner == address(0)) return;    // 0 address is special (usually marks no source/dest - no init needed)
        if (votePowerInitializationBlock[_owner] == 0) {
            // consistency check - no delegations should be made from or to owner before vote power is initialized
            // (that would be dangerous, because vote power would have been delegated incorrectly)
            assert(_votePowerOf(_owner) == 0 && !_hasAnyDelegations(_owner));
            _mintVotePower(_owner, 0, _balance);
            votePowerInitializationBlock[_owner] = block.number.add(1);
        }
    }
    
    /**
     * Has the vote power of `_owner` been initialized?
     * @param _owner The address to check.
     * @return true if vote power of _owner is initialized
     */
    function _votePowerInitialized(address _owner) internal view returns (bool) {
        if (!isReplacement) return true;
        return votePowerInitializationBlock[_owner] != 0;
    }

    /**
     * Was vote power of `_owner` initialized at some block?
     * @param _owner The address to check.
     * @param _blockNumber The block for which we want to check.
     * @return true if vote power of _owner was initialized at _blockNumber
     */
    function _votePowerInitializedAt(address _owner, uint256 _blockNumber) internal view returns (bool) {
        if (!isReplacement) return true;
        uint256 initblock = votePowerInitializationBlock[_owner];
        return initblock != 0 && initblock - 1 <= _blockNumber;
    }
}
          

./contracts/personalDelegation/interface/IDelegationAccount.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

import "../../tokenPools/interface/IIFtsoRewardManager.sol";
import "../../token/implementation/WNat.sol";
import "../../userInterfaces/IDistributionToDelegators.sol";
import "../../token/interface/IIGovernanceVotePower.sol";
import "../implementation/DelegationAccountManager.sol";

interface IDelegationAccount {

    event ClaimFtsoRewards(address delegationAccount, uint256[] rewardEpochs, uint256 amount,
        IIFtsoRewardManager ftsoRewardManager);
    event ClaimAirdrop(address delegationAccount, uint256 amount, uint256 month,
        IDistributionToDelegators distribution);
    event DelegateFtso(address delegationAccount, address to, uint256 bips);
    event DelegateGovernance(address delegationAccount, address to, uint256 balance);
    event UndelegateAllFtso(address delegationAccount);
    event UndelegateGovernance(address delegationAccount);
    event SetExecutor(address delegationAccount, address executor);
    event RemoveExecutor(address delegationAccount, address executor);
    event WidthrawToOwner(address delegationAccount, uint256 amount);
    event Initialize(address owner, DelegationAccountManager manager);
    event ClaimFtsoFailure(string err, IIFtsoRewardManager ftsoRewardManager);
    event ClaimDistributionFailure(string err, IDistributionToDelegators distribution);
    event EpochsWithUnclaimedRewardsFailure(string err, IIFtsoRewardManager ftsoRewardManager);

    function claimFtsoRewards(uint256[] memory _epochs) external returns(uint256);

    function claimAllFtsoRewards() external returns(uint256);

    function claimAirdropDistribution(uint256 _month) external returns(uint256);

    function delegate(address _to, uint256 _bips) external;

    function undelegateAll() external;

    function revokeDelegationAt(address _who, uint256 _blockNumber) external;

    function delegateGovernance(address _to) external;

    function undelegateGovernance() external;

    function setExecutor(address _executor) external;

    function removeExecutor(address _executor) external;

    function withdraw(uint256 _amount) external;
    
    function transferExternalToken(IERC20 _token, uint256 _amount) external;
}
          

./contracts/inflation/interface/IIInflationReceiver.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

interface IIInflationReceiver {
    /**
     * Notify the receiver that it is entitled to receive `_toAuthorizeWei` inflation amount.
     * @param _toAuthorizeWei the amount of inflation that can be awarded in the coming day
     */
    function setDailyAuthorizedInflation(uint256 _toAuthorizeWei) external;
    
    /**
     * Receive native tokens from inflation.
     */
    function receiveInflation() external payable;

    /**
     * Inflation receivers have a reference to the Inflation contract.
     */
    function getInflationAddress() external returns(address);
    
    /**
     * Implement this function for updating inflation receiver contracts through AddressUpdater.
     */
    function getContractName() external view returns (string memory);
}
          

@openzeppelin/contracts/token/ERC20/ERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../utils/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
          

./contracts/genesis/interface/IFtsoGenesis.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;


interface IFtsoGenesis {

    /**
     * @notice Reveals submitted price during epoch reveal period - only price submitter
     * @param _voter                Voter address
     * @param _epochId              Id of the epoch in which the price hash was submitted
     * @param _price                Submitted price in USD
     * @notice The hash of _price and _random must be equal to the submitted hash
     * @notice Emits PriceRevealed event
     */
    function revealPriceSubmitter(
        address _voter,
        uint256 _epochId,
        uint256 _price,
        uint256 _wNatVP
    ) external;

    /**
     * @notice Get (and cache) wNat vote power for specified voter and given epoch id
     * @param _voter                Voter address
     * @param _epochId              Id of the epoch in which the price hash was submitted
     * @return wNat vote power
     */
    function wNatVotePowerCached(address _voter, uint256 _epochId) external returns (uint256);
}
          

./contracts/userInterfaces/IVPToken.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {IGovernanceVotePower} from "./IGovernanceVotePower.sol";
import {IVPContractEvents} from "./IVPContractEvents.sol";

interface IVPToken is IERC20 {
    /**
     * @notice Delegate by percentage `_bips` of voting power to `_to` from `msg.sender`.
     * @param _to The address of the recipient
     * @param _bips The percentage of voting power to be delegated expressed in basis points (1/100 of one percent).
     *   Not cummulative - every call resets the delegation value (and value of 0 undelegates `to`).
     **/
    function delegate(address _to, uint256 _bips) external;
    
    /**
     * @notice Undelegate all percentage delegations from teh sender and then delegate corresponding 
     *   `_bips` percentage of voting power from the sender to each member of `_delegatees`.
     * @param _delegatees The addresses of the new recipients.
     * @param _bips The percentages of voting power to be delegated expressed in basis points (1/100 of one percent).
     *   Total of all `_bips` values must be at most 10000.
     **/
    function batchDelegate(address[] memory _delegatees, uint256[] memory _bips) external;
        
    /**
     * @notice Explicitly delegate `_amount` of voting power to `_to` from `msg.sender`.
     * @param _to The address of the recipient
     * @param _amount An explicit vote power amount to be delegated.
     *   Not cummulative - every call resets the delegation value (and value of 0 undelegates `to`).
     **/    
    function delegateExplicit(address _to, uint _amount) external;

    /**
    * @notice Revoke all delegation from sender to `_who` at given block. 
    *    Only affects the reads via `votePowerOfAtCached()` in the block `_blockNumber`.
    *    Block `_blockNumber` must be in the past. 
    *    This method should be used only to prevent rogue delegate voting in the current voting block.
    *    To stop delegating use delegate/delegateExplicit with value of 0 or undelegateAll/undelegateAllExplicit.
    * @param _who Address of the delegatee
    * @param _blockNumber The block number at which to revoke delegation.
    */
    function revokeDelegationAt(address _who, uint _blockNumber) external;
    
    /**
     * @notice Undelegate all voting power for delegates of `msg.sender`
     *    Can only be used with percentage delegation.
     *    Does not reset delegation mode back to NOTSET.
     **/
    function undelegateAll() external;
    
    /**
     * @notice Undelegate all explicit vote power by amount delegates for `msg.sender`.
     *    Can only be used with explicit delegation.
     *    Does not reset delegation mode back to NOTSET.
     * @param _delegateAddresses Explicit delegation does not store delegatees' addresses, 
     *   so the caller must supply them.
     * @return The amount still delegated (in case the list of delegates was incomplete).
     */
    function undelegateAllExplicit(address[] memory _delegateAddresses) external returns (uint256);


    /**
     * @dev Should be compatible with ERC20 method
     */
    function name() external view returns (string memory);

    /**
     * @dev Should be compatible with ERC20 method
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Should be compatible with ERC20 method
     */
    function decimals() external view returns (uint8);
    

    /**
     * @notice Total amount of tokens at a specific `_blockNumber`.
     * @param _blockNumber The block number when the totalSupply is queried
     * @return The total amount of tokens at `_blockNumber`
     **/
    function totalSupplyAt(uint _blockNumber) external view returns(uint256);

    /**
     * @dev Queries the token balance of `_owner` at a specific `_blockNumber`.
     * @param _owner The address from which the balance will be retrieved.
     * @param _blockNumber The block number when the balance is queried.
     * @return The balance at `_blockNumber`.
     **/
    function balanceOfAt(address _owner, uint _blockNumber) external view returns (uint256);

    
    /**
     * @notice Get the current total vote power.
     * @return The current total vote power (sum of all accounts' vote powers).
     */
    function totalVotePower() external view returns(uint256);
    
    /**
    * @notice Get the total vote power at block `_blockNumber`
    * @param _blockNumber The block number at which to fetch.
    * @return The total vote power at the block  (sum of all accounts' vote powers).
    */
    function totalVotePowerAt(uint _blockNumber) external view returns(uint256);

    /**
     * @notice Get the current vote power of `_owner`.
     * @param _owner The address to get voting power.
     * @return Current vote power of `_owner`.
     */
    function votePowerOf(address _owner) external view returns(uint256);
    
    /**
    * @notice Get the vote power of `_owner` at block `_blockNumber`
    * @param _owner The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_owner` at `_blockNumber`.
    */
    function votePowerOfAt(address _owner, uint256 _blockNumber) external view returns(uint256);

    /**
    * @notice Get the vote power of `_owner` at block `_blockNumber`, ignoring revocation information (and cache).
    * @param _owner The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_owner` at `_blockNumber`. Result doesn't change if vote power is revoked.
    */
    function votePowerOfAtIgnoringRevocation(address _owner, uint256 _blockNumber) external view returns(uint256);

    /**
     * @notice Get the delegation mode for '_who'. This mode determines whether vote power is
     *  allocated by percentage or by explicit value. Once the delegation mode is set, 
     *  it never changes, even if all delegations are removed.
     * @param _who The address to get delegation mode.
     * @return delegation mode: 0 = NOTSET, 1 = PERCENTAGE, 2 = AMOUNT (i.e. explicit)
     */
    function delegationModeOf(address _who) external view returns(uint256);
        
    /**
    * @notice Get current delegated vote power `_from` delegator delegated `_to` delegatee.
    * @param _from Address of delegator
    * @param _to Address of delegatee
    * @return The delegated vote power.
    */
    function votePowerFromTo(address _from, address _to) external view returns(uint256);
    
    /**
    * @notice Get delegated the vote power `_from` delegator delegated `_to` delegatee at `_blockNumber`.
    * @param _from Address of delegator
    * @param _to Address of delegatee
    * @param _blockNumber The block number at which to fetch.
    * @return The delegated vote power.
    */
    function votePowerFromToAt(address _from, address _to, uint _blockNumber) external view returns(uint256);
    
    /**
     * @notice Compute the current undelegated vote power of `_owner`
     * @param _owner The address to get undelegated voting power.
     * @return The unallocated vote power of `_owner`
     */
    function undelegatedVotePowerOf(address _owner) external view returns(uint256);
    
    /**
     * @notice Get the undelegated vote power of `_owner` at given block.
     * @param _owner The address to get undelegated voting power.
     * @param _blockNumber The block number at which to fetch.
     * @return The undelegated vote power of `_owner` (= owner's own balance minus all delegations from owner)
     */
    function undelegatedVotePowerOfAt(address _owner, uint256 _blockNumber) external view returns(uint256);
    
    /**
    * @notice Get the vote power delegation `delegationAddresses` 
    *  and `_bips` of `_who`. Returned in two separate positional arrays.
    * @param _who The address to get delegations.
    * @return _delegateAddresses Positional array of delegation addresses.
    * @return _bips Positional array of delegation percents specified in basis points (1/100 or 1 percent)
    * @return _count The number of delegates.
    * @return _delegationMode The mode of the delegation (NOTSET=0, PERCENTAGE=1, AMOUNT=2).
    */
    function delegatesOf(address _who)
        external view 
        returns (
            address[] memory _delegateAddresses,
            uint256[] memory _bips,
            uint256 _count, 
            uint256 _delegationMode
        );
        
    /**
    * @notice Get the vote power delegation `delegationAddresses` 
    *  and `pcts` of `_who`. Returned in two separate positional arrays.
    * @param _who The address to get delegations.
    * @param _blockNumber The block for which we want to know the delegations.
    * @return _delegateAddresses Positional array of delegation addresses.
    * @return _bips Positional array of delegation percents specified in basis points (1/100 or 1 percent)
    * @return _count The number of delegates.
    * @return _delegationMode The mode of the delegation (NOTSET=0, PERCENTAGE=1, AMOUNT=2).
    */
    function delegatesOfAt(address _who, uint256 _blockNumber)
        external view 
        returns (
            address[] memory _delegateAddresses, 
            uint256[] memory _bips, 
            uint256 _count, 
            uint256 _delegationMode
        );

    /**
     * Returns VPContract used for readonly operations (view methods).
     * The only non-view method that might be called on it is `revokeDelegationAt`.
     *
     * @notice `readVotePowerContract` is almost always equal to `writeVotePowerContract`
     * except during upgrade from one VPContract to a new version (which should happen
     * rarely or never and will be anounced before).
     *
     * @notice You shouldn't call any methods on VPContract directly, all are exposed
     * via VPToken (and state changing methods are forbidden from direct calls). 
     * This is the reason why this method returns `IVPContractEvents` - it should only be used
     * for listening to events (`Revoke` only).
     */
    function readVotePowerContract() external view returns (IVPContractEvents);

    /**
     * Returns VPContract used for state changing operations (non-view methods).
     * The only non-view method that might be called on it is `revokeDelegationAt`.
     *
     * @notice `writeVotePowerContract` is almost always equal to `readVotePowerContract`
     * except during upgrade from one VPContract to a new version (which should happen
     * rarely or never and will be anounced before). In the case of upgrade,
     * `writeVotePowerContract` will be replaced first to establish delegations, and
     * after some perio (e.g. after a reward epoch ends) `readVotePowerContract` will be set equal to it.
     *
     * @notice You shouldn't call any methods on VPContract directly, all are exposed
     * via VPToken (and state changing methods are forbidden from direct calls). 
     * This is the reason why this method returns `IVPContractEvents` - it should only be used
     * for listening to events (`Delegate` and `Revoke` only).
     */
    function writeVotePowerContract() external view returns (IVPContractEvents);
    
    /**
     * When set, allows token owners to participate in governance voting
     * and delegate governance vote power.
     */
    function governanceVotePower() external view returns (IGovernanceVotePower);
}
          

./contracts/userInterfaces/IPriceSubmitter.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

import "../genesis/interface/IFtsoGenesis.sol";
import "../genesis/interface/IFtsoRegistryGenesis.sol";
import "../genesis/interface/IFtsoManagerGenesis.sol";

interface IPriceSubmitter {
    /**
     * Event emitted when hash was submitted through PriceSubmitter.
     * @param submitter the address of the sender
     * @param epochId current price epoch id
     * @param hash the submitted hash
     * @param timestamp current block timestamp
     */
    event HashSubmitted(
        address indexed submitter,
        uint256 indexed epochId,
        bytes32 hash,
        uint256 timestamp
    );

    /**
     * Event emitted when prices were revealed through PriceSubmitter.
     * @param voter the address of the sender
     * @param epochId id of the epoch in which the price hash was submitted
     * @param ftsos array of ftsos that correspond to the indexes in the call
     * @param prices the submitted prices
     * @param timestamp current block timestamp
     */
    event PricesRevealed(
        address indexed voter,
        uint256 indexed epochId,
        IFtsoGenesis[] ftsos,
        uint256[] prices,
        uint256 random,
        uint256 timestamp
    );
    
    /**
     * @notice Submits hash for current epoch
     * @param _epochId              Target epoch id to which hash is submitted
     * @param _hash                 Hash of ftso indices, prices, random number and voter address
     * @notice Emits HashSubmitted event
     */
    function submitHash(
        uint256 _epochId,
        bytes32 _hash
    ) external;

    /**
     * @notice Reveals submitted prices during epoch reveal period
     * @param _epochId              Id of the epoch in which the price hashes was submitted
     * @param _ftsoIndices          List of increasing ftso indices
     * @param _prices               List of submitted prices in USD
     * @param _random               Submitted random number
     * @notice The hash of ftso indices, prices, random number and voter address must be equal to the submitted hash
     * @notice Emits PricesRevealed event
     */
    function revealPrices(
        uint256 _epochId,
        uint256[] memory _ftsoIndices,
        uint256[] memory _prices,
        uint256 _random
    ) external;

    /**
     * Returns bitmap of all ftso's for which `_voter` is allowed to submit prices/hashes.
     * If voter is allowed to vote for ftso at index (see *_FTSO_INDEX), the corrsponding
     * bit in the result will be 1.
     */    
    function voterWhitelistBitmap(address _voter) external view returns (uint256);

    function getVoterWhitelister() external view returns (address);
    function getFtsoRegistry() external view returns (IFtsoRegistryGenesis);
    function getFtsoManager() external view returns (IFtsoManagerGenesis);

    /**
     * @notice Returns current random number
     */
    function getCurrentRandom() external view returns (uint256);
    
    /**
     * @notice Returns random number of the specified epoch
     * @param _epochId              Id of the epoch
     */
    function getRandom(uint256 _epochId) external view returns (uint256);
}
          

./contracts/userInterfaces/IGovernanceSettings.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;


/**
 * A special contract that holds Flare governance address.
 * This contract enables updating governance address and timelock only by hard forking the network,
 * meaning only by updating validator code.
 */
interface IGovernanceSettings {
    /**
     * Get the governance account address.
     * The governance address can only be changed by a hardfork.
     */
    function getGovernanceAddress() external view returns (address);
    
    /**
     * Get the time in seconds that must pass between a governance call and execution.
     * The timelock value can only be changed by a hardfork.
     */
    function getTimelock() external view returns (uint256);
    
    /**
     * Get the addresses of the accounts that are allowed to execute the timelocked governance calls
     * once the timelock period expires.
     * Executors can be changed without a hardfork, via a normal governance call.
     */
    function getExecutors() external view returns (address[] memory);
    
    /**
     * Check whether an address is one of the executors.
     */
    function isExecutor(address _address) external view returns (bool);
}
          

./contracts/token/lib/CheckPointHistory.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "@openzeppelin/contracts/math/Math.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/SafeCast.sol";


/**
 * @title Check Point History library
 * @notice A contract to manage checkpoints as of a given block.
 * @dev Store value history by block number with detachable state.
 **/
library CheckPointHistory {
    using SafeMath for uint256;
    using SafeCast for uint256;

    /**
     * @dev `CheckPoint` is the structure that attaches a block number to a
     *  given value; the block number attached is the one that last changed the
     *  value
     **/
    struct CheckPoint {
        // `value` is the amount of tokens at a specific block number
        uint192 value;
        // `fromBlock` is the block number that the value was generated from
        uint64 fromBlock;
    }

    struct CheckPointHistoryState {
        // `checkpoints` is an array that tracks values at non-contiguous block numbers
        mapping(uint256 => CheckPoint) checkpoints;
        // `checkpoints` before `startIndex` have been deleted
        // INVARIANT: checkpoints.endIndex == 0 || startIndex < checkpoints.endIndex      (strict!)
        // startIndex and endIndex are both less then fromBlock, so 64 bits is enough
        uint64 startIndex;
        // the index AFTER last
        uint64 endIndex;
    }

    /**
     * @notice Binary search of _checkpoints array.
     * @param _checkpoints An array of CheckPoint to search.
     * @param _startIndex Smallest possible index to be returned.
     * @param _blockNumber The block number to search for.
     */
    function _indexOfGreatestBlockLessThan(
        mapping(uint256 => CheckPoint) storage _checkpoints, 
        uint256 _startIndex,
        uint256 _endIndex,
        uint256 _blockNumber
    )
        private view 
        returns (uint256 index)
    {
        // Binary search of the value by given block number in the array
        uint256 min = _startIndex;
        uint256 max = _endIndex.sub(1);
        while (max > min) {
            uint256 mid = (max.add(min).add(1)).div(2);
            if (_checkpoints[mid].fromBlock <= _blockNumber) {
                min = mid;
            } else {
                max = mid.sub(1);
            }
        }
        return min;
    }

    /**
     * @notice Queries the value at a specific `_blockNumber`
     * @param _self A CheckPointHistoryState instance to manage.
     * @param _blockNumber The block number of the value active at that time
     * @return _value The value at `_blockNumber`     
     **/
    function valueAt(
        CheckPointHistoryState storage _self, 
        uint256 _blockNumber
    )
        internal view 
        returns (uint256 _value)
    {
        uint256 historyCount = _self.endIndex;

        // No _checkpoints, return 0
        if (historyCount == 0) return 0;

        // Shortcut for the actual value (extra optimized for current block, to save one storage read)
        // historyCount - 1 is safe, since historyCount != 0
        if (_blockNumber >= block.number || _blockNumber >= _self.checkpoints[historyCount - 1].fromBlock) {
            return _self.checkpoints[historyCount - 1].value;
        }
        
        // guard values at start    
        uint256 startIndex = _self.startIndex;
        if (_blockNumber < _self.checkpoints[startIndex].fromBlock) {
            // reading data before `startIndex` is only safe before first cleanup
            require(startIndex == 0, "CheckPointHistory: reading from cleaned-up block");
            return 0;
        }

        // Find the block with number less than or equal to block given
        uint256 index = _indexOfGreatestBlockLessThan(_self.checkpoints, startIndex, _self.endIndex, _blockNumber);

        return _self.checkpoints[index].value;
    }

    /**
     * @notice Queries the value at `block.number`
     * @param _self A CheckPointHistoryState instance to manage.
     * @return _value The value at `block.number`
     **/
    function valueAtNow(CheckPointHistoryState storage _self) internal view returns (uint256 _value) {
        uint256 historyCount = _self.endIndex;
        // No _checkpoints, return 0
        if (historyCount == 0) return 0;
        // Return last value
        return _self.checkpoints[historyCount - 1].value;
    }

    /**
     * @notice Writes the value at the current block.
     * @param _self A CheckPointHistoryState instance to manage.
     * @param _value Value to write.
     **/
    function writeValue(
        CheckPointHistoryState storage _self, 
        uint256 _value
    )
        internal
    {
        uint256 historyCount = _self.endIndex;
        if (historyCount == 0) {
            // checkpoints array empty, push new CheckPoint
            _self.checkpoints[0] = 
                CheckPoint({ fromBlock: block.number.toUint64(), value: _toUint192(_value) });
            _self.endIndex = 1;
        } else {
            // historyCount - 1 is safe, since historyCount != 0
            CheckPoint storage lastCheckpoint = _self.checkpoints[historyCount - 1];
            uint256 lastBlock = lastCheckpoint.fromBlock;
            // slither-disable-next-line incorrect-equality
            if (block.number == lastBlock) {
                // If last check point is the current block, just update
                lastCheckpoint.value = _toUint192(_value);
            } else {
                // we should never have future blocks in history
                assert (block.number > lastBlock);
                // push new CheckPoint
                _self.checkpoints[historyCount] = 
                    CheckPoint({ fromBlock: block.number.toUint64(), value: _toUint192(_value) });
                _self.endIndex = uint64(historyCount + 1);  // 64 bit safe, because historyCount <= block.number
            }
        }
    }
    
    /**
     * Delete at most `_count` of the oldest checkpoints.
     * At least one checkpoint at or before `_cleanupBlockNumber` will remain 
     * (unless the history was empty to start with).
     */    
    function cleanupOldCheckpoints(
        CheckPointHistoryState storage _self, 
        uint256 _count,
        uint256 _cleanupBlockNumber
    )
        internal
        returns (uint256)
    {
        if (_cleanupBlockNumber == 0) return 0;   // optimization for when cleaning is not enabled
        uint256 length = _self.endIndex;
        if (length == 0) return 0;
        uint256 startIndex = _self.startIndex;
        // length - 1 is safe, since length != 0 (check above)
        uint256 endIndex = Math.min(startIndex.add(_count), length - 1);    // last element can never be deleted
        uint256 index = startIndex;
        // we can delete `checkpoint[index]` while the next checkpoint is at `_cleanupBlockNumber` or before
        while (index < endIndex && _self.checkpoints[index + 1].fromBlock <= _cleanupBlockNumber) {
            delete _self.checkpoints[index];
            index++;
        }
        if (index > startIndex) {   // index is the first not deleted index
            _self.startIndex = index.toUint64();
        }
        return index - startIndex;  // safe: index >= startIndex at start and then increases
    }

    // SafeCast lib is missing cast to uint192    
    function _toUint192(uint256 _value) internal pure returns (uint192) {
        require(_value < 2**192, "value doesn't fit in 192 bits");
        return uint192(_value);
    }
}
          

./contracts/governance/implementation/Governed.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import { GovernedBase } from "./GovernedBase.sol";


/**
 * @title Governed
 * @dev For deployed, governed contracts, enforce a non-zero address at create time.
 **/
contract Governed is GovernedBase {
    constructor(address _governance) GovernedBase(_governance) {
        require(_governance != address(0), "_governance zero");
    }
}
          

./contracts/governance/implementation/GovernedBase.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "../../userInterfaces/IGovernanceSettings.sol";


/**
 * @title Governed Base
 * @notice This abstract base class defines behaviors for a governed contract.
 * @dev This class is abstract so that specific behaviors can be defined for the constructor.
 *   Contracts should not be left ungoverned, but not all contract will have a constructor
 *   (for example those pre-defined in genesis).
 **/
abstract contract GovernedBase {
    struct TimelockedCall {
        uint256 allowedAfterTimestamp;
        bytes encodedCall;
    }
    
    // solhint-disable-next-line const-name-snakecase
    IGovernanceSettings public constant governanceSettings = 
        IGovernanceSettings(0x1000000000000000000000000000000000000007);

    address private initialGovernance;

    bool private initialised;
    
    bool public productionMode;
    
    bool private executing;
    
    mapping(bytes4 => TimelockedCall) public timelockedCalls;
    
    event GovernanceCallTimelocked(bytes4 selector, uint256 allowedAfterTimestamp, bytes encodedCall);
    event TimelockedGovernanceCallExecuted(bytes4 selector, uint256 timestamp);
    event TimelockedGovernanceCallCanceled(bytes4 selector, uint256 timestamp);
    
    event GovernanceInitialised(address initialGovernance);
    event GovernedProductionModeEntered(address governanceSettings);
    
    modifier onlyGovernance {
        if (executing || !productionMode) {
            _beforeExecute();
            _;
        } else {
            _recordTimelockedCall(msg.data);
        }
    }
    
    modifier onlyImmediateGovernance () {
        _checkOnlyGovernance();
        _;
    }

    constructor(address _initialGovernance) {
        if (_initialGovernance != address(0)) {
            initialise(_initialGovernance);
        }
    }

    /**
     * @notice Execute the timelocked governance calls once the timelock period expires.
     * @dev Only executor can call this method.
     * @param _selector The method selector (only one timelocked call per method is stored).
     */
    function executeGovernanceCall(bytes4 _selector) external {
        require(governanceSettings.isExecutor(msg.sender), "only executor");
        TimelockedCall storage call = timelockedCalls[_selector];
        require(call.allowedAfterTimestamp != 0, "timelock: invalid selector");
        require(block.timestamp >= call.allowedAfterTimestamp, "timelock: not allowed yet");
        bytes memory encodedCall = call.encodedCall;
        delete timelockedCalls[_selector];
        executing = true;
        //solhint-disable-next-line avoid-low-level-calls
        (bool success,) = address(this).call(encodedCall);
        executing = false;
        emit TimelockedGovernanceCallExecuted(_selector, block.timestamp);
        _passReturnOrRevert(success);
    }
    
    /**
     * Cancel a timelocked governance call before it has been executed.
     * @dev Only governance can call this method.
     * @param _selector The method selector.
     */
    function cancelGovernanceCall(bytes4 _selector) external onlyImmediateGovernance {
        require(timelockedCalls[_selector].allowedAfterTimestamp != 0, "timelock: invalid selector");
        emit TimelockedGovernanceCallCanceled(_selector, block.timestamp);
        delete timelockedCalls[_selector];
    }
    
    /**
     * Enter the production mode after all the initial governance settings have been set.
     * This enables timelocks and the governance is afterwards obtained by calling 
     * governanceSettings.getGovernanceAddress(). 
     */
    function switchToProductionMode() external {
        _checkOnlyGovernance();
        require(!productionMode, "already in production mode");
        initialGovernance = address(0);
        productionMode = true;
        emit GovernedProductionModeEntered(address(governanceSettings));
    }

    /**
     * @notice Initialize the governance address if not first initialized.
     */
    function initialise(address _initialGovernance) public virtual {
        require(initialised == false, "initialised != false");
        initialised = true;
        initialGovernance = _initialGovernance;
        emit GovernanceInitialised(_initialGovernance);
    }
    
    /**
     * Returns the current effective governance address.
     */
    function governance() public view returns (address) {
        return productionMode ? governanceSettings.getGovernanceAddress() : initialGovernance;
    }

    function _beforeExecute() private {
        if (executing) {
            // can only be run from executeGovernanceCall(), where we check that only executor can call
            // make sure nothing else gets executed, even in case of reentrancy
            assert(msg.sender == address(this));
            executing = false;
        } else {
            // must be called with: productionMode=false
            // must check governance in this case
            _checkOnlyGovernance();
        }
    }

    function _recordTimelockedCall(bytes calldata _data) private {
        _checkOnlyGovernance();
        bytes4 selector;
        //solhint-disable-next-line no-inline-assembly
        assembly {
            selector := calldataload(_data.offset)
        }
        uint256 timelock = governanceSettings.getTimelock();
        uint256 allowedAt = block.timestamp + timelock;
        timelockedCalls[selector] = TimelockedCall({
            allowedAfterTimestamp: allowedAt,
            encodedCall: _data
        });
        emit GovernanceCallTimelocked(selector, allowedAt, _data);
    }
    
    function _checkOnlyGovernance() private view {
        require(msg.sender == governance(), "only governance");
    }
    
    function _passReturnOrRevert(bool _success) private pure {
        // pass exact return or revert data - needs to be done in assembly
        //solhint-disable-next-line no-inline-assembly
        assembly {
            let size := returndatasize()
            let ptr := mload(0x40)
            mstore(0x40, add(ptr, size))
            returndatacopy(ptr, 0, size)
            if _success {
                return(ptr, size)
            }
            revert(ptr, size)
        }
    }
}
          

./contracts/personalDelegation/implementation/DelegationAccountManager.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "./DelegationAccountClonable.sol";
import "./CloneFactory.sol";
import "../interface/IDelegationAccountManager.sol";
import "../../tokenPools/interface/IIFtsoRewardManager.sol";
import "../../token/implementation/WNat.sol";
import "../../userInterfaces/IDistributionToDelegators.sol";
import "../..//userInterfaces/IGovernanceVotePower.sol";
import "../../governance/implementation/Governed.sol";
import "../../addressUpdater/implementation/AddressUpdatable.sol";

contract DelegationAccountManager is CloneFactory, IDelegationAccountManager, Governed, AddressUpdatable {

    WNat public wNat;
    IIFtsoRewardManager[] public ftsoRewardManagers;
    IGovernanceVotePower public governanceVP;
    IDistributionToDelegators[] public distributions;

    address public libraryAddress;

    mapping(address => address) public accountToDelegationAccount;

    constructor(
        address _governance,
        address _addressUpdater
    ) 
        Governed(_governance)
        AddressUpdatable(_addressUpdater)
    {}

    function setLibraryAddress(address _libraryAddress) external override onlyGovernance {
        libraryAddress = _libraryAddress;
        emit SetLibraryAddress(libraryAddress);
    }

    function createDelegationAccount() external override returns (DelegationAccountClonable) {
        require(libraryAddress != address(0), "library address is not set yet");
        require(accountToDelegationAccount[msg.sender] == address(0), "account already has delegation account");

        DelegationAccountClonable delegationAccount = DelegationAccountClonable(
            payable(createClone(libraryAddress))
        );

        delegationAccount.initialize(msg.sender, DelegationAccountManager(address(this)));
            
        accountToDelegationAccount[msg.sender] = address(delegationAccount);

        emit CreateDelegationAccount(address(delegationAccount), msg.sender);

        return delegationAccount;
    }

    function getFtsoRewardManagers() external view override returns(IIFtsoRewardManager[] memory) {
        return ftsoRewardManagers;
    }

    function getDistributions() external view override returns(IDistributionToDelegators[] memory) {
        return distributions;
    }

    /**
     * @notice Implementation of the AddressUpdatable abstract method.
     */
    function _updateContractAddresses(
        bytes32[] memory _contractNameHashes,
        address[] memory _contractAddresses
    )
        internal override
    {
        wNat = WNat(payable(_getContractAddress(_contractNameHashes, _contractAddresses, "WNat")));

        governanceVP = wNat.governanceVotePower();

        IIFtsoRewardManager ftsoRewardManager = IIFtsoRewardManager(
            _getContractAddress(_contractNameHashes, _contractAddresses, "FtsoRewardManager"));
        bool rewardManagersContain = false;
        for (uint256 i = 0; i < ftsoRewardManagers.length; i++) {
            if (ftsoRewardManagers[i] == ftsoRewardManager) {
                rewardManagersContain = true;
                break;
            }
        }
        if (!rewardManagersContain) {
            ftsoRewardManagers.push(ftsoRewardManager);
        }

        IDistributionToDelegators distribution = IDistributionToDelegators(
            _getContractAddress(_contractNameHashes, _contractAddresses, "DistributionToDelegators"));
        bool distributionsContain = false;
        for (uint256 i = 0; i < distributions.length; i++) {
            if (distributions[i] == distribution) {
                distributionsContain = true;
                break;
            }
        }
        if (!distributionsContain) {
            distributions.push(distribution);
        }
    }
}
          

./contracts/token/interface/IIVPToken.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

import "../../userInterfaces/IVPToken.sol";
import "../../userInterfaces/IGovernanceVotePower.sol";
import "./IIVPContract.sol";
import "./IIGovernanceVotePower.sol";
import "./IICleanable.sol";

interface IIVPToken is IVPToken, IICleanable {
    /**
     * Set the contract that is allowed to set cleanupBlockNumber.
     * Usually this will be an instance of CleanupBlockNumberManager.
     */
    function setCleanupBlockNumberManager(address _cleanupBlockNumberManager) external;
    
    /**
     * Sets new governance vote power contract that allows token owners to participate in governance voting
     * and delegate governance vote power. 
     */
    function setGovernanceVotePower(IIGovernanceVotePower _governanceVotePower) external;
    
    /**
    * @notice Get the total vote power at block `_blockNumber` using cache.
    *   It tries to read the cached value and if not found, reads the actual value and stores it in cache.
    *   Can only be used if `_blockNumber` is in the past, otherwise reverts.    
    * @param _blockNumber The block number at which to fetch.
    * @return The total vote power at the block (sum of all accounts' vote powers).
    */
    function totalVotePowerAtCached(uint256 _blockNumber) external returns(uint256);
    
    /**
    * @notice Get the vote power of `_owner` at block `_blockNumber` using cache.
    *   It tries to read the cached value and if not found, reads the actual value and stores it in cache.
    *   Can only be used if _blockNumber is in the past, otherwise reverts.    
    * @param _owner The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_owner` at `_blockNumber`.
    */
    function votePowerOfAtCached(address _owner, uint256 _blockNumber) external returns(uint256);

    /**
     * Return vote powers for several addresses in a batch.
     * @param _owners The list of addresses to fetch vote power of.
     * @param _blockNumber The block number at which to fetch.
     * @return A list of vote powers.
     */    
    function batchVotePowerOfAt(
        address[] memory _owners, 
        uint256 _blockNumber
    ) external view returns(uint256[] memory);
}
          

./contracts/userInterfaces/IDistributionToDelegators.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;
pragma abicoder v2;

interface IDistributionToDelegators {
    // Events
    event EntitlementStart(uint256 entitlementStartTs);
    event AccountClaimed(address indexed whoClaimed, address indexed sentTo, uint256 month, uint256 amountWei);
    event AccountOptOut(address indexed theAccount, bool confirmed);
    event ClaimExecutorsChanged(address rewardOwner, address[] executors);
    event AllowedClaimRecipientsChanged(address rewardOwner, address[] recipients);


    // Methods
    function optOutOfAirdrop() external;
    function claim(address _recipient, uint256 _month) external returns(uint256 _amountWei);
    function claimAndWrap(address _recipient, uint256 _month) external returns(uint256 _amountWei);
    function claimToPersonalDelegationAccount(uint256 _month) external returns(uint256 _amountWei);
    function claimByExecutor(address _rewardOwner, address _recipient, uint256 _month)
        external returns(uint256 _amountWei);
    function claimAndWrapByExecutor(address _rewardOwner, address _recipient, uint256 _month)
        external returns(uint256 _amountWei);
    function claimToPersonalDelegationAccountByExecutor(address _rewardOwner, uint256 _month) 
        external returns(uint256 _amountWei);
    function setClaimExecutors(address[] memory _executors) external;
    function setAllowedClaimRecipients(address[] memory _recipients) external;

    function getClaimableAmount(uint256 _month) external view returns(uint256 _amountWei);
    function getClaimableAmountOf(address account, uint256 _month) external view returns(uint256 _amountWei);
    function getClaimedAmount(uint256 _month) external view returns(uint256 _amountWei);
    function getClaimedAmountOf(address _account, uint256 _month) external view returns(uint256 _amountWei);
    function getCurrentMonth() external view returns (uint256 _currentMonth);
    function getMonthToExpireNext() external view returns (uint256 _monthToExpireNext);
    function secondsTillNextClaim() external view returns(uint256 _timetill);
    function claimExecutors(address _rewardOwner) external view returns (address[] memory);
    function allowedClaimRecipients(address _rewardOwner) external view returns (address[] memory);
}
          

./contracts/personalDelegation/implementation/CloneFactory.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

/*
The MIT License (MIT)

Copyright (c) 2018 Murray Software, LLC.

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
//solhint-disable max-line-length
//solhint-disable no-inline-assembly

contract CloneFactory {

  function createClone(address target) internal returns (address result) {
    bytes20 targetBytes = bytes20(target);
    assembly {
      let clone := mload(0x40)
      mstore(clone, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
      mstore(add(clone, 0x14), targetBytes)
      mstore(add(clone, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
      result := create(0, clone, 0x37)
    }
  }

  function isClone(address target, address query) internal view returns (bool result) {
    bytes20 targetBytes = bytes20(target);
    assembly {
      let clone := mload(0x40)
      mstore(clone, 0x363d3d373d3d3d363d7300000000000000000000000000000000000000000000)
      mstore(add(clone, 0xa), targetBytes)
      mstore(add(clone, 0x1e), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)

      let other := add(clone, 0x40)
      extcodecopy(query, other, 0, 0x2d)
      result := and(
        eq(mload(clone), mload(other)),
        eq(mload(add(clone, 0xd)), mload(add(other, 0xd)))
      )
    }
  }
}
          

./contracts/genesis/interface/IFtsoManagerGenesis.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;


interface IFtsoManagerGenesis {

    function getCurrentPriceEpochId() external view returns (uint256 _priceEpochId);

}
          

./contracts/tokenPools/interface/IITokenPool.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

interface IITokenPool {

    /**
     * @notice Return token pool supply data
     * @return _lockedFundsWei                  Funds that are intentionally locked in the token pool 
     * and not part of circulating supply
     * @return _totalInflationAuthorizedWei     Total inflation authorized amount (wei)
     * @return _totalClaimedWei                 Total claimed amount (wei)
     */
    function getTokenPoolSupplyData() external returns (
        uint256 _lockedFundsWei,
        uint256 _totalInflationAuthorizedWei,
        uint256 _totalClaimedWei
    );
}
          

./contracts/token/interface/IIGovernanceVotePower.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

import "../../userInterfaces/IVPToken.sol";
import "../../userInterfaces/IGovernanceVotePower.sol";

interface IIGovernanceVotePower is IGovernanceVotePower {
    /**
     * Event triggered when an delegator's balance changes.
     *
     * Note: the event is always emitted from `GovernanceVotePower`.
     */
    event DelegateVotesChanged(
    address indexed delegate, 
    uint256 previousBalance, 
    uint256 newBalance
    );

    /**
     * Event triggered when an account delegates to another account.
     *
     * Note: the event is always emitted from `GovernanceVotePower`.
     */
    event DelegateChanged(
    address indexed delegator, 
    address indexed fromDelegate, 
    address indexed toDelegate
    );

    /**
     * Update vote powers when tokens are transfered.
     **/
    function updateAtTokenTransfer(
        address _from,
        address _to,
        uint256 _fromBalance,
        uint256 _toBalance,
        uint256 _amount
    ) external;

    /**
     * Set the cleanup block number.
     * Historic data for the blocks before `cleanupBlockNumber` can be erased,
     * history before that block should never be used since it can be inconsistent.
     * In particular, cleanup block number must be before current vote power block.
     * @param _blockNumber The new cleanup block number.
     */
    function setCleanupBlockNumber(uint256 _blockNumber) external;

    /**
     * Set the contract that is allowed to call history cleaning methods.
     */
    function setCleanerContract(address _cleanerContract) external;

    /**
     * @notice Get the token that this governance vote power contract belongs to.
     */
    function ownerToken() external view returns (IVPToken);

    function getCleanupBlockNumber() external view returns(uint256);
}
          

./contracts/utils/implementation/AddressSet.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

library AddressSet {
    struct State {
        address[] list;
        mapping (address => uint256) index;
    }
    
    function add(State storage _state, address _address) internal {
        if (_state.index[_address] != 0) return;
        _state.list.push(_address);
        _state.index[_address] = _state.list.length;
    }
    
    function remove(State storage _state, address _address) internal {
        uint256 position = _state.index[_address];
        if (position == 0) return;
        if (position < _state.list.length) {
            _state.list[position - 1] = _state.list[_state.list.length - 1];
        }
        _state.list.pop();
        delete _state.index[_address];
    }
    
    function addAll(State storage _state, address[] memory _addresses) internal {
        for (uint256 i = 0; i < _addresses.length; i++) {
            add(_state, _addresses[i]);
        }
    }
    
    function replaceAll(State storage _state, address[] memory _addresses) internal {
        clear(_state);
        addAll(_state, _addresses);
    }
    
    function clear(State storage _state) internal {
        while (_state.list.length > 0) {
            delete _state.index[_state.list[_state.list.length - 1]];
            _state.list.pop();
        }
    }
}
          

./contracts/tokenPools/interface/IIFtsoRewardManager.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

import "../../userInterfaces/IFtsoRewardManager.sol";
import "../interface/IITokenPool.sol";
import "../../inflation/interface/IIInflationReceiver.sol";

interface IIFtsoRewardManager is IFtsoRewardManager, IIInflationReceiver, IITokenPool {

    event DailyAuthorizedInflationSet(uint256 authorizedAmountWei);
    event InflationReceived(uint256 amountReceivedWei);
    event RewardsBurned(uint256 amountBurnedWei);

    function activate() external;
    function enableClaims() external;
    function deactivate() external;
    function closeExpiredRewardEpoch(uint256 _rewardEpochId) external;

    function distributeRewards(
        address[] memory addresses,
        uint256[] memory weights,
        uint256 totalWeight,
        uint256 epochId,
        address ftso,
        uint256 priceEpochDurationSeconds,
        uint256 currentRewardEpoch,
        uint256 priceEpochEndTime,
        uint256 votePowerBlock
    ) external;

    function accrueUnearnedRewards(
        uint256 epochId,
        uint256 priceEpochDurationSeconds,
        uint256 priceEpochEndTime
    ) external;

    function firstClaimableRewardEpoch() external view returns (uint256);

    /**
     * @notice Returns the information on unclaimed reward of `_dataProvider` for `_rewardEpoch`
     * @param _rewardEpoch          reward epoch number
     * @param _dataProvider         address representing the data provider
     * @return _amount              number representing the unclaimed amount
     * @return _weight              number representing the share that has not yet been claimed
     */
    function getUnclaimedReward(
        uint256 _rewardEpoch,
        address _dataProvider
    )
        external view
        returns (
            uint256 _amount,
            uint256 _weight
        );
}
          

./contracts/governance/implementation/GovernedAtGenesis.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "./GovernedBase.sol";


/**
 * @title Governed At Genesis
 * @dev This contract enforces a fixed governance address when the constructor
 *  is not executed on a contract (for instance when directly loaded to the genesis block).
 *  This is required to fix governance on a contract when the network starts, at such point
 *  where theoretically no accounts yet exist, and leaving it ungoverned could result in a race
 *  to claim governance by an unauthorized address.
 **/
contract GovernedAtGenesis is GovernedBase {
    constructor(address _governance) GovernedBase(_governance) { }

    /**
     * @notice Set governance to a fixed address when constructor is not called.
     **/
    function initialiseFixedAddress() public virtual returns (address) {
        address governanceAddress = address(0xfffEc6C83c8BF5c3F4AE0cCF8c45CE20E4560BD7);
        
        super.initialise(governanceAddress);
        return governanceAddress;
    }

    /**
     * @notice Disallow initialise to be called
     * @param _governance The governance address for initial claiming
     **/
    // solhint-disable-next-line no-unused-vars
    function initialise(address _governance) public override pure {
        assert(false);
    }
}
          

@openzeppelin/contracts/utils/SafeCast.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;


/**
 * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow
 * checks.
 *
 * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can
 * easily result in undesired exploitation or bugs, since developers usually
 * assume that overflows raise errors. `SafeCast` restores this intuition by
 * reverting the transaction when such an operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 *
 * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing
 * all math on `uint256` and `int256` and then downcasting.
 */
library SafeCast {

    /**
     * @dev Returns the downcasted uint128 from uint256, reverting on
     * overflow (when the input is greater than largest uint128).
     *
     * Counterpart to Solidity's `uint128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     */
    function toUint128(uint256 value) internal pure returns (uint128) {
        require(value < 2**128, "SafeCast: value doesn\'t fit in 128 bits");
        return uint128(value);
    }

    /**
     * @dev Returns the downcasted uint64 from uint256, reverting on
     * overflow (when the input is greater than largest uint64).
     *
     * Counterpart to Solidity's `uint64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     */
    function toUint64(uint256 value) internal pure returns (uint64) {
        require(value < 2**64, "SafeCast: value doesn\'t fit in 64 bits");
        return uint64(value);
    }

    /**
     * @dev Returns the downcasted uint32 from uint256, reverting on
     * overflow (when the input is greater than largest uint32).
     *
     * Counterpart to Solidity's `uint32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     */
    function toUint32(uint256 value) internal pure returns (uint32) {
        require(value < 2**32, "SafeCast: value doesn\'t fit in 32 bits");
        return uint32(value);
    }

    /**
     * @dev Returns the downcasted uint16 from uint256, reverting on
     * overflow (when the input is greater than largest uint16).
     *
     * Counterpart to Solidity's `uint16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     */
    function toUint16(uint256 value) internal pure returns (uint16) {
        require(value < 2**16, "SafeCast: value doesn\'t fit in 16 bits");
        return uint16(value);
    }

    /**
     * @dev Returns the downcasted uint8 from uint256, reverting on
     * overflow (when the input is greater than largest uint8).
     *
     * Counterpart to Solidity's `uint8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits.
     */
    function toUint8(uint256 value) internal pure returns (uint8) {
        require(value < 2**8, "SafeCast: value doesn\'t fit in 8 bits");
        return uint8(value);
    }

    /**
     * @dev Converts a signed int256 into an unsigned uint256.
     *
     * Requirements:
     *
     * - input must be greater than or equal to 0.
     */
    function toUint256(int256 value) internal pure returns (uint256) {
        require(value >= 0, "SafeCast: value must be positive");
        return uint256(value);
    }

    /**
     * @dev Returns the downcasted int128 from int256, reverting on
     * overflow (when the input is less than smallest int128 or
     * greater than largest int128).
     *
     * Counterpart to Solidity's `int128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     *
     * _Available since v3.1._
     */
    function toInt128(int256 value) internal pure returns (int128) {
        require(value >= -2**127 && value < 2**127, "SafeCast: value doesn\'t fit in 128 bits");
        return int128(value);
    }

    /**
     * @dev Returns the downcasted int64 from int256, reverting on
     * overflow (when the input is less than smallest int64 or
     * greater than largest int64).
     *
     * Counterpart to Solidity's `int64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     *
     * _Available since v3.1._
     */
    function toInt64(int256 value) internal pure returns (int64) {
        require(value >= -2**63 && value < 2**63, "SafeCast: value doesn\'t fit in 64 bits");
        return int64(value);
    }

    /**
     * @dev Returns the downcasted int32 from int256, reverting on
     * overflow (when the input is less than smallest int32 or
     * greater than largest int32).
     *
     * Counterpart to Solidity's `int32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     *
     * _Available since v3.1._
     */
    function toInt32(int256 value) internal pure returns (int32) {
        require(value >= -2**31 && value < 2**31, "SafeCast: value doesn\'t fit in 32 bits");
        return int32(value);
    }

    /**
     * @dev Returns the downcasted int16 from int256, reverting on
     * overflow (when the input is less than smallest int16 or
     * greater than largest int16).
     *
     * Counterpart to Solidity's `int16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     *
     * _Available since v3.1._
     */
    function toInt16(int256 value) internal pure returns (int16) {
        require(value >= -2**15 && value < 2**15, "SafeCast: value doesn\'t fit in 16 bits");
        return int16(value);
    }

    /**
     * @dev Returns the downcasted int8 from int256, reverting on
     * overflow (when the input is less than smallest int8 or
     * greater than largest int8).
     *
     * Counterpart to Solidity's `int8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits.
     *
     * _Available since v3.1._
     */
    function toInt8(int256 value) internal pure returns (int8) {
        require(value >= -2**7 && value < 2**7, "SafeCast: value doesn\'t fit in 8 bits");
        return int8(value);
    }

    /**
     * @dev Converts an unsigned uint256 into a signed int256.
     *
     * Requirements:
     *
     * - input must be less than or equal to maxInt256.
     */
    function toInt256(uint256 value) internal pure returns (int256) {
        require(value < 2**255, "SafeCast: value doesn't fit in an int256");
        return int256(value);
    }
}
          

./contracts/token/lib/CheckPointHistoryCache.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "./CheckPointHistory.sol";


library CheckPointHistoryCache {
    using SafeMath for uint256;
    using CheckPointHistory for CheckPointHistory.CheckPointHistoryState;
    
    struct CacheState {
        // mapping blockNumber => (value + 1)
        mapping(uint256 => uint256) cache;
    }
    
    function valueAt(
        CacheState storage _self,
        CheckPointHistory.CheckPointHistoryState storage _checkPointHistory,
        uint256 _blockNumber
    )
        internal returns (uint256 _value, bool _cacheCreated)
    {
        // is it in cache?
        uint256 cachedValue = _self.cache[_blockNumber];
        if (cachedValue != 0) {
            return (cachedValue - 1, false);    // safe, cachedValue != 0
        }
        // read from _checkPointHistory
        uint256 historyValue = _checkPointHistory.valueAt(_blockNumber);
        _self.cache[_blockNumber] = historyValue.add(1);  // store to cache (add 1 to differentiate from empty)
        return (historyValue, true);
    }
    
    function deleteAt(
        CacheState storage _self,
        uint256 _blockNumber
    )
        internal returns (uint256 _deleted)
    {
        if (_self.cache[_blockNumber] != 0) {
            _self.cache[_blockNumber] = 0;
            return 1;
        }
        return 0;
    }
}
          

./contracts/token/implementation/VPToken.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "./CheckPointable.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "../../utils/implementation/SafePct.sol";
import "../../userInterfaces/IVPToken.sol";
import "../../userInterfaces/IVPContractEvents.sol";
import "../interface/IIVPToken.sol";
import "../interface/IIVPContract.sol";
import "../interface/IIGovernanceVotePower.sol";
import "../../userInterfaces/IGovernanceVotePower.sol";
import "../../governance/implementation/Governed.sol";

/**
 * @title Vote Power Token
 * @dev An ERC20 token to enable the holder to delegate voting power
 *  equal 1-1 to their balance, with history tracking by block.
 **/
contract VPToken is IIVPToken, ERC20, CheckPointable, Governed {
    using SafeMath for uint256;
    using SafePct for uint256;

    // the VPContract to use for reading vote powers and delegations
    IIVPContract private readVpContract;

    // the VPContract to use for writing vote powers and delegations
    // normally same as `readVpContract` except during switch
    // when reading happens from the old and writing goes to the new VPContract
    IIVPContract private writeVpContract;
    
    // the contract to use for governance vote power and delegation
    // here only to properly update governance vp during transfers -
    // all actual operations go directly to governance vp contract
    IIGovernanceVotePower private governanceVP;
    
    // the contract that is allowed to set cleanupBlockNumber
    // usually this will be an instance of CleanupBlockNumberManager
    address public cleanupBlockNumberManager;
    
    /**
     * When true, the argument to `setWriteVpContract` must be a vpContract
     * with `isReplacement` set to `true`. To be used for creating the correct VPContract.
     */
    bool public vpContractInitialized = false;

    /**
     * Event used to track history of VPToken -> VPContract / GovernanceVotePower 
     * associations (e.g. by external cleaners).
     * @param _contractType 0 = read VPContract, 1 = write VPContract, 2 = governance vote power
     * @param _oldContractAddress vote power contract address before change
     * @param _newContractAddress vote power contract address after change
     */ 
    event VotePowerContractChanged(uint256 _contractType, address _oldContractAddress, address _newContractAddress);
    
    constructor(
        address _governance,
        //slither-disable-next-line shadowing-local
        string memory _name, 
        //slither-disable-next-line shadowing-local
        string memory _symbol
    )
        Governed(_governance) ERC20(_name, _symbol) 
    {
        /* empty block */
    }
    
    /**
     * @dev Should be compatible with ERC20 method
     */
    function name() public view override(ERC20, IVPToken) returns (string memory) {
        return ERC20.name();
    }

    /**
     * @dev Should be compatible with ERC20 method
     */
    function symbol() public view override(ERC20, IVPToken) returns (string memory) {
        return ERC20.symbol();
    }

    /**
     * @dev Should be compatible with ERC20 method
     */
    function decimals() public view override(ERC20, IVPToken) returns (uint8) {
        return ERC20.decimals();
    }

    /**
     * @notice Total amount of tokens at a specific `_blockNumber`.
     * @param _blockNumber The block number when the totalSupply is queried
     * @return The total amount of tokens at `_blockNumber`
     **/
    function totalSupplyAt(uint256 _blockNumber) public view override(CheckPointable, IVPToken) returns(uint256) {
        return CheckPointable.totalSupplyAt(_blockNumber);
    }

    /**
     * @dev Queries the token balance of `_owner` at a specific `_blockNumber`.
     * @param _owner The address from which the balance will be retrieved.
     * @param _blockNumber The block number when the balance is queried.
     * @return The balance at `_blockNumber`.
     **/
    function balanceOfAt(
        address _owner, 
        uint256 _blockNumber
    )
        public view 
        override(CheckPointable, IVPToken)
        returns (uint256)
    {
        return CheckPointable.balanceOfAt(_owner, _blockNumber);
    }
    
    /**
     * @notice Delegate `_bips` of voting power to `_to` from `msg.sender`
     * @param _to The address of the recipient
     * @param _bips The percentage of voting power to be delegated expressed in basis points (1/100 of one percent).
     *   Not cummulative - every call resets the delegation value (and value of 0 revokes delegation).
     **/
    function delegate(address _to, uint256 _bips) external override {
        // Get the current balance of sender and delegate by percentage _to recipient
        _checkWriteVpContract().delegate(msg.sender, _to, balanceOf(msg.sender), _bips);
    }

    /**
     * @notice Undelegate all percentage delegations from teh sender and then delegate corresponding 
     *   `_bips` percentage of voting power from the sender to each member of `_delegatees`.
     * @param _delegatees The addresses of the new recipients.
     * @param _bips The percentages of voting power to be delegated expressed in basis points (1/100 of one percent).
     *   Total of all `_bips` values must be at most 10000.
     **/
    function batchDelegate(address[] memory _delegatees, uint256[] memory _bips) external override {
        require(_delegatees.length == _bips.length, "Array length mismatch");
        IIVPContract vpContract = _checkWriteVpContract();
        uint256 balance = balanceOf(msg.sender);
        vpContract.undelegateAll(msg.sender, balance);
        for (uint256 i = 0; i < _delegatees.length; i++) {
            vpContract.delegate(msg.sender, _delegatees[i], balance, _bips[i]);
        }
    }
    
    /**
     * @notice Delegate `_amount` of voting power to `_to` from `msg.sender`
     * @param _to The address of the recipient
     * @param _amount An explicit vote power amount to be delegated.
     *   Not cummulative - every call resets the delegation value (and value of 0 revokes delegation).
     **/    
    function delegateExplicit(address _to, uint256 _amount) external override {
        _checkWriteVpContract().delegateExplicit(msg.sender, _to, balanceOf(msg.sender), _amount);
    }

    /**
     * @notice Compute the current undelegated vote power of `_owner`
     * @param _owner The address to get undelegated voting power.
     * @return The unallocated vote power of `_owner`
     */
    function undelegatedVotePowerOf(address _owner) external view override returns(uint256) {
        return _checkReadVpContract().undelegatedVotePowerOf(_owner, balanceOf(_owner));
    }

    /**
     * @notice Get the undelegated vote power of `_owner` at given block.
     * @param _owner The address to get undelegated voting power.
     * @param _blockNumber The block number at which to fetch.
     * @return The unallocated vote power of `_owner`
     */
    function undelegatedVotePowerOfAt(address _owner, uint256 _blockNumber) external view override returns (uint256) {
        return _checkReadVpContract()
            .undelegatedVotePowerOfAt(_owner, balanceOfAt(_owner, _blockNumber), _blockNumber);
    }

    /**
     * @notice Undelegate all voting power for delegates of `msg.sender`
     **/
    function undelegateAll() external override {
        _checkWriteVpContract().undelegateAll(msg.sender, balanceOf(msg.sender));
    }

    /**
     * @notice Undelegate all explicit vote power by amount delegates for `msg.sender`.
     * @param _delegateAddresses Explicit delegation does not store delegatees' addresses, 
     *   so the caller must supply them.
     * @return _remainingDelegation The amount still delegated (in case the list of delegates was incomplete).
     */
    function undelegateAllExplicit(
        address[] memory _delegateAddresses
    )
        external override 
        returns (uint256 _remainingDelegation)
    {
        return _checkWriteVpContract().undelegateAllExplicit(msg.sender, _delegateAddresses);
    }
    
    /**
    * @notice Revoke all delegation from sender to `_who` at given block. 
    *    Only affects the reads via `votePowerOfAtCached()` in the block `_blockNumber`.
    *    Block `_blockNumber` must be in the past. 
    *    This method should be used only to prevent rogue delegate voting in the current voting block.
    *    To stop delegating use delegate/delegateExplicit with value of 0 or undelegateAll/undelegateAllExplicit.
    */
    function revokeDelegationAt(address _who, uint256 _blockNumber) public override {
        IIVPContract writeVPC = writeVpContract;
        IIVPContract readVPC = readVpContract;
        if (address(writeVPC) != address(0)) {
            writeVPC.revokeDelegationAt(msg.sender, _who, balanceOfAt(msg.sender, _blockNumber), _blockNumber);
        }
        if (address(readVPC) != address(writeVPC) && address(readVPC) != address(0)) {
            try readVPC.revokeDelegationAt(msg.sender, _who, balanceOfAt(msg.sender, _blockNumber), _blockNumber) {
            } catch {
                // do nothing
            }
        }
    }

    /**
    * @notice Get current delegated vote power `_from` delegator delegated `_to` delegatee.
    * @param _from Address of delegator
    * @param _to Address of delegatee
    * @return votePower The delegated vote power.
    */
    function votePowerFromTo(
        address _from, 
        address _to
    )
        external view override 
        returns(uint256)
    {
        return _checkReadVpContract().votePowerFromTo(_from, _to, balanceOf(_from));
    }
    
    /**
    * @notice Get delegated the vote power `_from` delegator delegated `_to` delegatee at `_blockNumber`.
    * @param _from Address of delegator
    * @param _to Address of delegatee
    * @param _blockNumber The block number at which to fetch.
    * @return The delegated vote power.
    */
    function votePowerFromToAt(
        address _from, 
        address _to, 
        uint256 _blockNumber
    )
        external view override 
        returns(uint256)
    {
        return _checkReadVpContract().votePowerFromToAt(_from, _to, balanceOfAt(_from, _blockNumber), _blockNumber);
    }
    
    /**
     * @notice Get the current total vote power.
     * @return The current total vote power (sum of all accounts' vote powers).
     */
    function totalVotePower() external view override returns(uint256) {
        return totalSupply();
    }

    /**
    * @notice Get the total vote power at block `_blockNumber`
    * @param _blockNumber The block number at which to fetch.
    * @return The total vote power at the block  (sum of all accounts' vote powers).
    */
    function totalVotePowerAt(uint256 _blockNumber) external view override returns(uint256) {
        return totalSupplyAt(_blockNumber);
    }

    /**
    * @notice Get the total vote power at block `_blockNumber` using cache.
    *   It tries to read the cached value and if not found, reads the actual value and stores it in cache.
    *   Can only be used if `_blockNumber` is in the past, otherwise reverts.    
    * @param _blockNumber The block number at which to fetch.
    * @return The total vote power at the block (sum of all accounts' vote powers).
    */
    function totalVotePowerAtCached(uint256 _blockNumber) public override returns(uint256) {
        return _totalSupplyAtCached(_blockNumber);
    }
    
    /**
     * @notice Get the delegation mode for '_who'. This mode determines whether vote power is
     *  allocated by percentage or by explicit value. Once the delegation mode is set, 
     *  it never changes, even if all delegations are removed.
     * @param _who The address to get delegation mode.
     * @return delegation mode: 0 = NOTSET, 1 = PERCENTAGE, 2 = AMOUNT (i.e. explicit)
     */
    function delegationModeOf(address _who) external view override returns (uint256) {
        return _checkReadVpContract().delegationModeOf(_who);
    }

    /**
     * @notice Get the current vote power of `_owner`.
     * @param _owner The address to get voting power.
     * @return Current vote power of `_owner`.
     */
    function votePowerOf(address _owner) external view override returns(uint256) {
        return _checkReadVpContract().votePowerOf(_owner);
    }


    /**
    * @notice Get the vote power of `_owner` at block `_blockNumber`
    * @param _owner The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_owner` at `_blockNumber`.
    */
    function votePowerOfAt(address _owner, uint256 _blockNumber) external view override returns(uint256) {
        return _checkReadVpContract().votePowerOfAt(_owner, _blockNumber);
    }

    /**
    * @notice Get the vote power of `_owner` at block `_blockNumber`, ignoring revocation information (and cache).
    * @param _owner The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_owner` at `_blockNumber`. Result doesn't change if vote power is revoked.
    */
    function votePowerOfAtIgnoringRevocation(address _owner, uint256 _blockNumber)
        external view override
        returns(uint256) 
    {
        return _checkReadVpContract().votePowerOfAtIgnoringRevocation(_owner, _blockNumber);
    }

    /**
     * Return vote powers for several addresses in a batch.
     * @param _owners The list of addresses to fetch vote power of.
     * @param _blockNumber The block number at which to fetch.
     * @return A list of vote powers.
     */    
    function batchVotePowerOfAt(
        address[] memory _owners, 
        uint256 _blockNumber
    )
        external view override 
        returns(uint256[] memory)
    {
        return _checkReadVpContract().batchVotePowerOfAt(_owners, _blockNumber);
    }
    
    /**
    * @notice Get the vote power of `_owner` at block `_blockNumber` using cache.
    *   It tries to read the cached value and if not found, reads the actual value and stores it in cache.
    *   Can only be used if _blockNumber is in the past, otherwise reverts.    
    * @param _owner The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_owner` at `_blockNumber`.
    */
    function votePowerOfAtCached(address _owner, uint256 _blockNumber) public override returns(uint256) {
        return _checkReadVpContract().votePowerOfAtCached(_owner, _blockNumber);
    }
    
    /**
    * @notice Get the vote power delegation `delegationAddresses` 
    *  and `_bips` of `_who`. Returned in two separate positional arrays.
    * @param _owner The address to get delegations.
    * @return _delegateAddresses Positional array of delegation addresses.
    * @return _bips Positional array of delegation percents specified in basis points (1/100 or 1 percent)
    * @return _count The number of delegates.
    * @return _delegationMode The mode of the delegation (NOTSET=0, PERCENTAGE=1, AMOUNT=2).
    */
    function delegatesOf(
        address _owner
    )
        external view override 
        returns (
            address[] memory _delegateAddresses, 
            uint256[] memory _bips,
            uint256 _count,
            uint256 _delegationMode
        )
    {
        return _checkReadVpContract().delegatesOf(_owner);
    }
    
    /**
    * @notice Get the vote power delegation `delegationAddresses` 
    *  and `pcts` of `_who`. Returned in two separate positional arrays.
    * @param _owner The address to get delegations.
    * @param _blockNumber The block for which we want to know the delegations.
    * @return _delegateAddresses Positional array of delegation addresses.
    * @return _bips Positional array of delegation percents specified in basis points (1/100 or 1 percent)
    * @return _count The number of delegates.
    * @return _delegationMode The mode of the delegation (NOTSET=0, PERCENTAGE=1, AMOUNT=2).
    */
    function delegatesOfAt(
        address _owner,
        uint256 _blockNumber
    )
        external view override 
        returns (
            address[] memory _delegateAddresses, 
            uint256[] memory _bips,
            uint256 _count,
            uint256 _delegationMode
        )
    {
        return _checkReadVpContract().delegatesOfAt(_owner, _blockNumber);
    }

    // Update vote power and balance checkpoints before balances are modified. This is implemented
    // in the _beforeTokenTransfer hook, which is executed for _mint, _burn, and _transfer operations.
    function _beforeTokenTransfer(
        address _from, 
        address _to, 
        uint256 _amount
    )
        internal virtual 
        override(ERC20)
    {
        require(_from != _to, "Cannot transfer to self");
        
        uint256 fromBalance = _from != address(0) ? balanceOf(_from) : 0;
        uint256 toBalance = _to != address(0) ? balanceOf(_to) : 0;
        
        // update vote powers
        IIVPContract vpc = writeVpContract;
        if (address(vpc) != address(0)) {
            vpc.updateAtTokenTransfer(_from, _to, fromBalance, toBalance, _amount);
        } else if (!vpContractInitialized) {
            // transfers without vpcontract are allowed, but after they are made
            // any added vpcontract must have isReplacement set
            vpContractInitialized = true;
        }
        
        // update governance vote powers
        IIGovernanceVotePower gvp = governanceVP;
        if (address(gvp) != address(0)) {
            gvp.updateAtTokenTransfer(_from, _to, fromBalance, toBalance, _amount);
        }

        // update balance history
        _updateBalanceHistoryAtTransfer(_from, _to, _amount);
    }

    /**
     * Call from governance to set read VpContract on token, e.g. 
     * `vpToken.setReadVpContract(new VPContract(vpToken))`
     * Read VPContract must be set before any of the VPToken delegation or vote power reading methods are called, 
     * otherwise they will revert.
     * NOTE: If readVpContract differs from writeVpContract all reads will be "frozen" and will not reflect
     * changes (not even revokes; they may or may not reflect balance transfers).
     * @param _vpContract Read vote power contract to be used by this token.
     */
    function setReadVpContract(IIVPContract _vpContract) external onlyGovernance {
        if (address(_vpContract) != address(0)) {
            require(address(_vpContract.ownerToken()) == address(this),
                "VPContract not owned by this token");
            // set contract's cleanup block
            _vpContract.setCleanupBlockNumber(_cleanupBlockNumber());
        }
        emit VotePowerContractChanged(0, address(readVpContract), address(_vpContract));
        readVpContract = _vpContract;
    }

    /**
     * Call from governance to set write VpContract on token, e.g. 
     * `vpToken.setWriteVpContract(new VPContract(vpToken))`
     * Write VPContract must be set before any of the VPToken delegation modifying methods are called, 
     * otherwise they will revert.
     * @param _vpContract Write vote power contract to be used by this token.
     */
    function setWriteVpContract(IIVPContract _vpContract) external onlyGovernance {
        if (address(_vpContract) != address(0)) {
            require(address(_vpContract.ownerToken()) == address(this),
                "VPContract not owned by this token");
            require(!vpContractInitialized || _vpContract.isReplacement(),
                "VPContract not configured for replacement");
            // set contract's cleanup block
            _vpContract.setCleanupBlockNumber(_cleanupBlockNumber());
            // once a non-null vpcontract is set, every other has to have isReplacement flag set
            vpContractInitialized = true;
        }
        emit VotePowerContractChanged(1, address(writeVpContract), address(_vpContract));
        writeVpContract = _vpContract;
    }
    
    /**
     * Return read vpContract, ensuring that it is not zero.
     */
    function _checkReadVpContract() internal view returns (IIVPContract) {
        IIVPContract vpc = readVpContract;
        require(address(vpc) != address(0), "Token missing read VPContract");
        return vpc;
    }

    /**
     * Return write vpContract, ensuring that it is not zero.
     */
    function _checkWriteVpContract() internal view returns (IIVPContract) {
        IIVPContract vpc = writeVpContract;
        require(address(vpc) != address(0), "Token missing write VPContract");
        return vpc;
    }
    
    /**
     * Return vpContract use for reading, may be zero.
     */
    function _getReadVpContract() internal view returns (IIVPContract) {
        return readVpContract;
    }

    /**
     * Return vpContract use for writing, may be zero.
     */
    function _getWriteVpContract() internal view returns (IIVPContract) {
        return writeVpContract;
    }

    /**
     * Returns VPContract event interface used for readonly operations (view methods).
     */
    function readVotePowerContract() external view override returns (IVPContractEvents) {
        return readVpContract;
    }

    /**
     * Returns VPContract event interface used for state changing operations (non-view methods).
     */
    function writeVotePowerContract() external view override returns (IVPContractEvents) {
        return writeVpContract;
    }

    /**
     * Set the cleanup block number.
     * Historic data for the blocks before `cleanupBlockNumber` can be erased,
     * history before that block should never be used since it can be inconsistent.
     * In particular, cleanup block number must be before current vote power block.
     * @param _blockNumber The new cleanup block number.
     */
    function setCleanupBlockNumber(uint256 _blockNumber) external override {
        require(msg.sender == cleanupBlockNumberManager, "only cleanup block manager");
        _setCleanupBlockNumber(_blockNumber);
        if (address(readVpContract) != address(0)) {
            readVpContract.setCleanupBlockNumber(_blockNumber);
        }
        if (address(writeVpContract) != address(0) && address(writeVpContract) != address(readVpContract)) {
            writeVpContract.setCleanupBlockNumber(_blockNumber);
        }
        if (address(governanceVP) != address(0)) {
            governanceVP.setCleanupBlockNumber(_blockNumber);
        }
    }
    
    /**
     * Get the current cleanup block number.
     */
    function cleanupBlockNumber() external view override returns (uint256) {
        return _cleanupBlockNumber();
    }
    
    /**
     * Set the contract that is allowed to set cleanupBlockNumber.
     * Usually this will be an instance of CleanupBlockNumberManager.
     */
    function setCleanupBlockNumberManager(address _cleanupBlockNumberManager) external override onlyGovernance {
        cleanupBlockNumberManager = _cleanupBlockNumberManager;
    }
    
    /**
     * Set the contract that is allowed to call history cleaning methods.
     */
    function setCleanerContract(address _cleanerContract) external override onlyGovernance {
        _setCleanerContract(_cleanerContract);
        if (address(readVpContract) != address(0)) {
            readVpContract.setCleanerContract(_cleanerContract);
        }
        if (address(writeVpContract) != address(0) && address(writeVpContract) != address(readVpContract)) {
            writeVpContract.setCleanerContract(_cleanerContract);
        }
        if (address(governanceVP) != address(0)) {
            governanceVP.setCleanerContract(_cleanerContract);
        }
    }
    
    /**
     * Sets new governance vote power contract that allows token owners to participate in governance voting
     * and delegate governance vote power. 
     */
    function setGovernanceVotePower(IIGovernanceVotePower _governanceVotePower) external override onlyGovernance {
        require(address(_governanceVotePower.ownerToken()) == address(this), 
            "Governance vote power contract does not belong to this token.");
        emit VotePowerContractChanged(2, address(governanceVP), address(_governanceVotePower));
        governanceVP = _governanceVotePower;
    }

    /**
     * When set, allows token owners to participate in governance voting
     * and delegate governance vote power. 
     */
     function governanceVotePower() external view override returns (IGovernanceVotePower) {
         return governanceVP;
     }
}
          

./contracts/inflation/interface/IISupply.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;


interface IISupply {

    /**
     * @notice Updates circulating supply
     * @dev Also updates the burn address amount
    */
    function updateCirculatingSupply() external;

    /**
     * @notice Updates authorized inflation and circulating supply - emits event if error
     * @param _inflationAuthorizedWei               Authorized inflation
     * @dev Also updates the burn address amount
    */
    function updateAuthorizedInflationAndCirculatingSupply(uint256 _inflationAuthorizedWei) external;

    /**
     * @notice Get approximate circulating supply for given block number from cache - only past block
     * @param _blockNumber                          Block number
     * @return _circulatingSupplyWei Return approximate circulating supply for last known block <= _blockNumber
    */
    function getCirculatingSupplyAtCached(uint256 _blockNumber) external returns(uint256 _circulatingSupplyWei);

    /**
     * @notice Get approximate circulating supply for given block number
     * @param _blockNumber                          Block number
     * @return _circulatingSupplyWei Return approximate circulating supply for last known block <= _blockNumber
    */
    function getCirculatingSupplyAt(uint256 _blockNumber) external view returns(uint256 _circulatingSupplyWei);

    /**
     * @notice Get total inflatable balance (initial genesis amount + total authorized inflation)
     * @return _inflatableBalanceWei Return inflatable balance
    */
    function getInflatableBalance() external view returns(uint256 _inflatableBalanceWei);
}
          

./contracts/userInterfaces/IFtsoRewardManager.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

interface IFtsoRewardManager {

    event RewardClaimed(
        address indexed dataProvider,
        address indexed whoClaimed,
        address indexed sentTo,
        uint256 rewardEpoch, 
        uint256 amount
    );

    event UnearnedRewardsAccrued(
        uint256 epochId,
        uint256 reward
    );

    event RewardsDistributed(
        address indexed ftso,
        uint256 epochId,
        address[] addresses,
        uint256[] rewards
    );

    event RewardClaimsEnabled(
        uint256 rewardEpochId
    ); 

    event FeePercentageChanged(
        address indexed dataProvider,
        uint256 value,
        uint256 validFromEpoch
    );

    event RewardClaimsExpired(
        uint256 rewardEpochId
    );    
    
    event ClaimExecutorsChanged(
        address rewardOwner,
        address[] executors
    );

    event AllowedClaimRecipientsChanged(
        address rewardOwner,
        address[] recipients
    );

    /**
     * @notice Allows a percentage delegator to claim rewards.
     * @notice This function is intended to be used to claim rewards in case of delegation by percentage.
     * @param _recipient            address to transfer funds to
     * @param _rewardEpochs         array of reward epoch numbers to claim for
     * @return _rewardAmount        amount of total claimed rewards
     * @dev Reverts if `msg.sender` is delegating by amount
     */
    function claimReward(address payable _recipient, uint256[] memory _rewardEpochs)
        external returns (uint256 _rewardAmount);

    /**
     * @notice Allows a percentage delegator to claim and wrap rewards.
     * @notice This function is intended to be used to claim and wrap rewards in case of delegation by percentage.
     * @param _recipient            address to transfer funds to
     * @param _rewardEpochs         array of reward epoch numbers to claim for
     * @return _rewardAmount        amount of total claimed rewards
     * @dev Reverts if `msg.sender` is delegating by amount
     */
    function claimAndWrapReward(address payable _recipient, uint256[] memory _rewardEpochs)
        external returns (uint256 _rewardAmount);

    /**
     * @notice Allows a percentage delegator to claim and wrap rewards.
     * @notice This function is intended to be used to claim and wrap rewards in case of delegation by percentage.
     * @notice The caller does not have to be the owner, but must be approved by the owner to claim on his behalf.
     *   this approval is done by calling `addClaimExecutor`.
     * @notice It is actually safe for this to be called by anybody (nothing can be stolen), but by limiting who can
     *   call, we allow the owner to control the timing of the calls.
     * @param _rewardOwner          address of the reward owner
     * @param _recipient            address of the recipient; must be either _rewardOwner or one of the addresses 
     *  allowed by the _rewardOwner
     * @param _rewardEpochs         array of reward epoch numbers to claim for
     * @return _rewardAmount        amount of total claimed rewards
     * @dev Reverts if `msg.sender` is delegating by amount
     */
    function claimAndWrapRewardByExecutor(
        address _rewardOwner,
        address payable _recipient,
        uint256[] memory _rewardEpochs
    ) external returns (uint256 _rewardAmount);

    /**
     * @notice Allows the sender to claim rewards from specified data providers.
     * @notice This function is intended to be used to claim rewards in case of delegation by amount.
     * @param _recipient            address to transfer funds to
     * @param _rewardEpochs         array of reward epoch numbers to claim for
     * @param _dataProviders        array of addresses representing data providers to claim the reward from
     * @return _rewardAmount        amount of total claimed rewards
     * @dev Function can be used by a percentage delegator but is more gas consuming than `claimReward`.
     */
    function claimRewardFromDataProviders(
        address payable _recipient,
        uint256[] memory _rewardEpochs,
        address[] memory _dataProviders
    )
        external
        returns (uint256 _rewardAmount);

    /**
     * @notice Allows the sender to claim and wrap rewards from specified data providers.
     * @notice This function is intended to be used to claim and wrap rewards in case of delegation by amount.
     * @param _recipient            address to transfer funds to
     * @param _rewardEpochs         array of reward epoch numbers to claim for
     * @param _dataProviders        array of addresses representing data providers to claim the reward from
     * @return _rewardAmount        amount of total claimed rewards
     * @dev Function can be used by a percentage delegator but is more gas consuming than `claimReward`.
     */
    function claimAndWrapRewardFromDataProviders(
        address payable _recipient,
        uint256[] memory _rewardEpochs,
        address[] memory _dataProviders
    )
        external
        returns (uint256 _rewardAmount);

    /**
     * @notice Allows the sender to claim and wrap rewards from specified data providers.
     * @notice This function is intended to be used to claim and wrap rewards in case of delegation by amount.
     * @notice The caller does not have to be the owner, but must be approved by the owner to claim on his behalf.
     *   this approval is done by calling `addClaimExecutor`.
     * @notice It is actually safe for this to be called by anybody (nothing can be stolen), but by limiting who can
     *   call, we allow the owner to control the timing of the calls.
     * @param _rewardOwner          address of the reward owner
     * @param _recipient            address of the recipient; must be either _rewardOwner or one of the addresses 
     *  allowed by the _rewardOwner
     * @param _rewardEpochs         array of reward epoch numbers to claim for
     * @param _dataProviders        array of addresses representing data providers to claim the reward from
     * @return _rewardAmount        amount of total claimed rewards
     * @dev Function can be used by a percentage delegator but is more gas consuming than `claimReward`.
     */
    function claimAndWrapRewardFromDataProvidersByExecutor(
        address _rewardOwner,
        address payable _recipient,
        uint256[] memory _rewardEpochs,
        address[] memory _dataProviders
    ) external returns (uint256 _rewardAmount);
        
    /**
     * Set the addresses of executors, who are allowed to call claimAndWrapRewardByExecutor
     * and claimAndWrapRewardFromDataProvidersByExecutor.
     * @param _executors The new executors. All old executors will be deleted and replaced by these.
     */    
    function setClaimExecutors(address[] memory _executors) external;

    /**
     * Set the addresses of allowed recipients in the methods claimAndWrapRewardByExecutor
     * and claimAndWrapRewardFromDataProvidersByExecutor.
     * Apart from these, the reward owner is always an allowed recipient.
     * @param _recipients The new allowed recipients. All old recipients will be deleted and replaced by these.
     */    
    function setAllowedClaimRecipients(address[] memory _recipients) external;
    
    /**
     * @notice Allows data provider to set (or update last) fee percentage.
     * @param _feePercentageBIPS    number representing fee percentage in BIPS
     * @return _validFromEpoch      reward epoch number when the setting becomes effective.
     */
    function setDataProviderFeePercentage(uint256 _feePercentageBIPS)
        external returns (uint256 _validFromEpoch);

    /**
     * @notice Allows reward claiming
     */
    function active() external view returns (bool);

    /**
     * @notice Returns the current fee percentage of `_dataProvider`
     * @param _dataProvider         address representing data provider
     */
    function getDataProviderCurrentFeePercentage(address _dataProvider)
        external view returns (uint256 _feePercentageBIPS);

    /**
     * @notice Returns the fee percentage of `_dataProvider` at `_rewardEpoch`
     * @param _dataProvider         address representing data provider
     * @param _rewardEpoch          reward epoch number
     */
    function getDataProviderFeePercentage(
        address _dataProvider,
        uint256 _rewardEpoch
    )
        external view
        returns (uint256 _feePercentageBIPS);

    /**
     * @notice Returns the scheduled fee percentage changes of `_dataProvider`
     * @param _dataProvider         address representing data provider
     * @return _feePercentageBIPS   positional array of fee percentages in BIPS
     * @return _validFromEpoch      positional array of block numbers the fee setings are effective from
     * @return _fixed               positional array of boolean values indicating if settings are subjected to change
     */
    function getDataProviderScheduledFeePercentageChanges(address _dataProvider) external view 
        returns (
            uint256[] memory _feePercentageBIPS,
            uint256[] memory _validFromEpoch,
            bool[] memory _fixed
        );

    /**
     * @notice Returns information on epoch reward
     * @param _rewardEpoch          reward epoch number
     * @return _totalReward         number representing the total epoch reward
     * @return _claimedReward       number representing the amount of total epoch reward that has been claimed
     */
    function getEpochReward(uint256 _rewardEpoch) external view
        returns (uint256 _totalReward, uint256 _claimedReward);

    /**
     * @notice Returns the state of rewards for `_beneficiary` at `_rewardEpoch`
     * @param _beneficiary          address of reward beneficiary
     * @param _rewardEpoch          reward epoch number
     * @return _dataProviders       positional array of addresses representing data providers
     * @return _rewardAmounts       positional array of reward amounts
     * @return _claimed             positional array of boolean values indicating if reward is claimed
     * @return _claimable           boolean value indicating if rewards are claimable
     * @dev Reverts when queried with `_beneficary` delegating by amount
     */
    function getStateOfRewards(
        address _beneficiary,
        uint256 _rewardEpoch
    )
        external view 
        returns (
            address[] memory _dataProviders,
            uint256[] memory _rewardAmounts,
            bool[] memory _claimed,
            bool _claimable
        );

    /**
     * @notice Returns the state of rewards for `_beneficiary` at `_rewardEpoch` from `_dataProviders`
     * @param _beneficiary          address of reward beneficiary
     * @param _rewardEpoch          reward epoch number
     * @param _dataProviders        positional array of addresses representing data providers
     * @return _rewardAmounts       positional array of reward amounts
     * @return _claimed             positional array of boolean values indicating if reward is claimed
     * @return _claimable           boolean value indicating if rewards are claimable
     */
    function getStateOfRewardsFromDataProviders(
        address _beneficiary,
        uint256 _rewardEpoch,
        address[] memory _dataProviders
    )
        external view
        returns (
            uint256[] memory _rewardAmounts,
            bool[] memory _claimed,
            bool _claimable
        );

    /**
     * @notice Returns the start and the end of the reward epoch range for which the reward is claimable
     * @param _startEpochId         the oldest epoch id that allows reward claiming
     * @param _endEpochId           the newest epoch id that allows reward claiming
     */
    function getEpochsWithClaimableRewards() external view 
        returns (
            uint256 _startEpochId,
            uint256 _endEpochId
        );

    /**
     * @notice Returns the array of claimable epoch ids for which the reward has not yet been claimed
     * @param _beneficiary          address of reward beneficiary
     * @return _epochIds            array of epoch ids
     * @dev Reverts when queried with `_beneficary` delegating by amount
     */
    function getEpochsWithUnclaimedRewards(address _beneficiary) external view returns (
        uint256[] memory _epochIds
    );

    /**
     * @notice Returns the information on claimed reward of `_dataProvider` for `_rewardEpoch` by `_claimer`
     * @param _rewardEpoch          reward epoch number
     * @param _dataProvider         address representing the data provider
     * @param _claimer              address representing the claimer
     * @return _claimed             boolean indicating if reward has been claimed
     * @return _amount              number representing the claimed amount
     */
    function getClaimedReward(
        uint256 _rewardEpoch,
        address _dataProvider,
        address _claimer
    )
        external view
        returns (
            bool _claimed,
            uint256 _amount
        );

    /**
     * @notice Return reward epoch that will expire, when new reward epoch will start
     * @return Reward epoch id that will expire next
     */
    function getRewardEpochToExpireNext() external view returns (uint256);

    /**
     * @notice Return reward epoch vote power block
     * @param _rewardEpoch          reward epoch number
     */
    function getRewardEpochVotePowerBlock(uint256 _rewardEpoch) external view returns (uint256);

    /**
     * @notice Return current reward epoch number
     */
    function getCurrentRewardEpoch() external view returns (uint256);

    /**
     * @notice Return initial reward epoch number
     */
    function getInitialRewardEpoch() external view returns (uint256);

    /**
     * @notice Returns the information on rewards and initial vote power of `_dataProvider` for `_rewardEpoch`
     * @param _rewardEpoch                      reward epoch number
     * @param _dataProvider                     address representing the data provider
     * @return _rewardAmount                    number representing the amount of rewards
     * @return _votePowerIgnoringRevocation     number representing the vote power ignoring revocations
     */
    function getDataProviderPerformanceInfo(
        uint256 _rewardEpoch,
        address _dataProvider
    )
        external view 
        returns (
            uint256 _rewardAmount,
            uint256 _votePowerIgnoringRevocation
        );

    /**
     * Get the addresses of executors, who are allowed to call claimAndWrapRewardByExecutor
     * and claimAndWrapRewardFromDataProvidersByExecutor.
     */    
    function claimExecutors(address _rewardOwner) external view returns (address[] memory);
    
    /**
     * Get the addresses of allowed recipients in the methods claimAndWrapRewardByExecutor
     * and claimAndWrapRewardFromDataProvidersByExecutor.
     * Apart from these, the reward owner is always an allowed recipient.
     */    
    function allowedClaimRecipients(address _rewardOwner) external view returns (address[] memory);
}
          

./contracts/token/implementation/Delegatable.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "../lib/PercentageDelegation.sol";
import "../lib/ExplicitDelegation.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "../../utils/implementation/SafePct.sol";
import "../lib/VotePower.sol";
import "../lib/VotePowerCache.sol";
import "../../userInterfaces/IVPContractEvents.sol";

/**
 * @title Delegateable ERC20 behavior
 * @notice An ERC20 Delegateable behavior to delegate voting power
 *  of a token to delegates. This contract orchestrates interaction between
 *  managing a delegation and the vote power allocations that result.
 **/
contract Delegatable is IVPContractEvents {
    using PercentageDelegation for PercentageDelegation.DelegationState;
    using ExplicitDelegation for ExplicitDelegation.DelegationState;
    using SafeMath for uint256;
    using SafePct for uint256;
    using VotePower for VotePower.VotePowerState;
    using VotePowerCache for VotePowerCache.CacheState;

    enum DelegationMode { 
        NOTSET, 
        PERCENTAGE, 
        AMOUNT
    }

    // The number of history cleanup steps executed for every write operation.
    // It is more than 1 to make as certain as possible that all history gets cleaned eventually.
    uint256 private constant CLEANUP_COUNT = 2;
    
    string constant private UNDELEGATED_VP_TOO_SMALL_MSG = 
        "Undelegated vote power too small";

    // Map that tracks delegation mode of each address.
    mapping(address => DelegationMode) private delegationModes;

    // `percentageDelegations` is the map that tracks the percentage voting power delegation of each address.
    // Explicit delegations are tracked directly through votePower.
    mapping(address => PercentageDelegation.DelegationState) private percentageDelegations;
    
    mapping(address => ExplicitDelegation.DelegationState) private explicitDelegations;

    // `votePower` tracks all voting power balances
    VotePower.VotePowerState private votePower;

    // `votePower` tracks all voting power balances
    VotePowerCache.CacheState private votePowerCache;

    // Historic data for the blocks before `cleanupBlockNumber` can be erased,
    // history before that block should never be used since it can be inconsistent.
    uint256 private cleanupBlockNumber;
    
    // Address of the contract that is allowed to call methods for history cleaning.
    address public cleanerContract;
    
    /**
     * Emitted when a vote power cache entry is created.
     * Allows history cleaners to track vote power cache cleanup opportunities off-chain.
     */
    event CreatedVotePowerCache(address _owner, uint256 _blockNumber);
    
    // Most history cleanup opportunities can be deduced from standard events:
    // Transfer(from, to, amount):
    //  - vote power checkpoints for `from` (if nonzero) and `to` (if nonzero)
    //  - vote power checkpoints for percentage delegatees of `from` and `to` are also created,
    //    but they don't have to be checked since Delegate events are also emitted in case of 
    //    percentage delegation vote power change due to delegators balance change
    //  - Note: Transfer event is emitted from VPToken but vote power checkpoint delegationModes
    //    must be called on its writeVotePowerContract
    // Delegate(from, to, priorVP, newVP):
    //  - vote power checkpoints for `from` and `to`
    //  - percentage delegation checkpoint for `from` (if `from` uses percentage delegation mode)
    //  - explicit delegation checkpoint from `from` to `to` (if `from` uses explicit delegation mode)
    // Revoke(from, to, vp, block):
    //  - vote power cache for `from` and `to` at `block`
    //  - revocation cache block from `from` to `to` at `block`
    
    /**
     * Reading from history is not allowed before `cleanupBlockNumber`, since data before that
     * might have been deleted and is thus unreliable.
     */    
    modifier notBeforeCleanupBlock(uint256 _blockNumber) {
        require(_blockNumber >= cleanupBlockNumber, "Delegatable: reading from cleaned-up block");
        _;
    }
    
    /**
     * History cleaning methods can be called only from the cleaner address.
     */
    modifier onlyCleaner {
        require(msg.sender == cleanerContract, "Only cleaner contract");
        _;
    }

    /**
     * @notice (Un)Allocate `_owner` vote power of `_amount` across owner delegate
     *  vote power percentages.
     * @param _owner The address of the vote power owner.
     * @param _priorBalance The owner's balance before change.
     * @param _newBalance The owner's balance after change.
     * @dev precondition: delegationModes[_owner] == DelegationMode.PERCENTAGE
     */
    function _allocateVotePower(address _owner, uint256 _priorBalance, uint256 _newBalance) private {
        // Get the voting delegation for the _owner
        PercentageDelegation.DelegationState storage delegation = percentageDelegations[_owner];
        // Track total owner vp change
        uint256 ownerVpAdd = _newBalance;
        uint256 ownerVpSub = _priorBalance;
        // Iterate over the delegates
        (uint256 length, mapping(uint256 => DelegationHistory.Delegation) storage delegations) = 
            delegation.getDelegationsRaw();
        for (uint256 i = 0; i < length; i++) {
            DelegationHistory.Delegation storage dlg = delegations[i];
            address delegatee = dlg.delegate;
            uint256 value = dlg.value;
            // Compute the delegated vote power for the delegatee
            uint256 priorValue = _priorBalance.mulDiv(value, PercentageDelegation.MAX_BIPS);
            uint256 newValue = _newBalance.mulDiv(value, PercentageDelegation.MAX_BIPS);
            ownerVpAdd = ownerVpAdd.add(priorValue);
            ownerVpSub = ownerVpSub.add(newValue);
            // could optimize next lines by checking that priorValue != newValue, but that can only happen
            // for the transfer of 0 amount, which is prevented by the calling function
            votePower.changeValue(delegatee, newValue, priorValue);
            votePower.cleanupOldCheckpoints(delegatee, CLEANUP_COUNT, cleanupBlockNumber);
            emit Delegate(_owner, delegatee, priorValue, newValue);
        }
        // (ownerVpAdd - ownerVpSub) is how much the owner vp changes - will be 0 if delegation is 100%
        if (ownerVpAdd != ownerVpSub) {
            votePower.changeValue(_owner, ownerVpAdd, ownerVpSub);
            votePower.cleanupOldCheckpoints(_owner, CLEANUP_COUNT, cleanupBlockNumber);    
        }
    }

    /**
     * @notice Burn `_amount` of vote power for `_owner`.
     * @param _owner The address of the _owner vote power to burn.
     * @param _ownerCurrentBalance The current token balance of the owner (which is their allocatable vote power).
     * @param _amount The amount of vote power to burn.
     */
    function _burnVotePower(address _owner, uint256 _ownerCurrentBalance, uint256 _amount) internal {
        // revert with the same error as ERC20 in case transfer exceeds balance
        uint256 newOwnerBalance = _ownerCurrentBalance.sub(_amount, "ERC20: transfer amount exceeds balance");
        if (delegationModes[_owner] == DelegationMode.PERCENTAGE) {
            // for PERCENTAGE delegation: reduce owner vote power allocations
            _allocateVotePower(_owner, _ownerCurrentBalance, newOwnerBalance);
        } else {
            // for AMOUNT delegation: is there enough unallocated VP _to burn if explicitly delegated?
            require(_isTransmittable(_owner, _ownerCurrentBalance, _amount), UNDELEGATED_VP_TOO_SMALL_MSG);
            // burn vote power
            votePower.changeValue(_owner, 0, _amount);
            votePower.cleanupOldCheckpoints(_owner, CLEANUP_COUNT, cleanupBlockNumber);
        }
    }

    /**
     * @notice Get whether `_owner` current delegation can be delegated by percentage.
     * @param _owner Address of delegation to check.
     * @return True if delegation can be delegated by percentage.
     */
    function _canDelegateByPct(address _owner) internal view returns(bool) {
        // Get the delegation mode.
        DelegationMode delegationMode = delegationModes[_owner];
        // Return true if delegation is safe _to store percents, which can also
        // apply if there is not delegation mode set.
        return delegationMode == DelegationMode.NOTSET || delegationMode == DelegationMode.PERCENTAGE;
    }

    /**
     * @notice Get whether `_owner` current delegation can be delegated by amount.
     * @param _owner Address of delegation to check.
     * @return True if delegation can be delegated by amount.
     */
    function _canDelegateByAmount(address _owner) internal view returns(bool) {
        // Get the delegation mode.
        DelegationMode delegationMode = delegationModes[_owner];
        // Return true if delegation is safe to store explicit amounts, which can also
        // apply if there is not delegation mode set.
        return delegationMode == DelegationMode.NOTSET || delegationMode == DelegationMode.AMOUNT;
    }

    /**
     * @notice Delegate `_amount` of voting power to `_to` from `_from`
     * @param _from The address of the delegator
     * @param _to The address of the recipient
     * @param _senderCurrentBalance The senders current balance (not their voting power)
     * @param _amount The amount of voting power to be delegated
     **/
    function _delegateByAmount(
        address _from, 
        address _to, 
        uint256 _senderCurrentBalance, 
        uint256 _amount
    )
        internal virtual 
    {
        require (_to != address(0), "Cannot delegate to zero");
        require (_to != _from, "Cannot delegate to self");
        require (_canDelegateByAmount(_from), "Cannot delegate by amount");
        
        // Get the vote power delegation for the sender
        ExplicitDelegation.DelegationState storage delegation = explicitDelegations[_from];
        
        // the prior value
        uint256 priorAmount = delegation.getDelegatedValue(_to);
        
        // Delegate new power
        if (_amount < priorAmount) {
            // Prior amount is greater, just reduce the delegated amount.
            // subtraction is safe since _amount < priorAmount
            votePower.undelegate(_from, _to, priorAmount - _amount);
        } else {
            // Is there enough undelegated vote power?
            uint256 availableAmount = _undelegatedVotePowerOf(_from, _senderCurrentBalance).add(priorAmount);
            require(availableAmount >= _amount, UNDELEGATED_VP_TOO_SMALL_MSG);
            // Increase the delegated amount of vote power.
            // subtraction is safe since _amount >= priorAmount
            votePower.delegate(_from, _to, _amount - priorAmount);
        }
        votePower.cleanupOldCheckpoints(_from, CLEANUP_COUNT, cleanupBlockNumber);
        votePower.cleanupOldCheckpoints(_to, CLEANUP_COUNT, cleanupBlockNumber);
        
        // Add/replace delegate
        delegation.addReplaceDelegate(_to, _amount);
        delegation.cleanupOldCheckpoints(_to, CLEANUP_COUNT, cleanupBlockNumber);

        // update mode if needed
        if (delegationModes[_from] != DelegationMode.AMOUNT) {
            delegationModes[_from] = DelegationMode.AMOUNT;
        }
        
        // emit event for delegation change
        emit Delegate(_from, _to, priorAmount, _amount);
    }

    /**
     * @notice Delegate `_bips` of voting power to `_to` from `_from`
     * @param _from The address of the delegator
     * @param _to The address of the recipient
     * @param _senderCurrentBalance The senders current balance (not their voting power)
     * @param _bips The percentage of voting power in basis points (1/100 of 1 percent) to be delegated
     **/
    function _delegateByPercentage(
        address _from, 
        address _to, 
        uint256 _senderCurrentBalance, 
        uint256 _bips
    )
        internal virtual
    {
        require (_to != address(0), "Cannot delegate to zero");
        require (_to != _from, "Cannot delegate to self");
        require (_canDelegateByPct(_from), "Cannot delegate by percentage");
        
        // Get the vote power delegation for the sender
        PercentageDelegation.DelegationState storage delegation = percentageDelegations[_from];

        // Get prior percent for delegate if exists
        uint256 priorBips = delegation.getDelegatedValue(_to);
        uint256 reverseVotePower = 0;
        uint256 newVotePower = 0;

        // Add/replace delegate
        delegation.addReplaceDelegate(_to, _bips);
        delegation.cleanupOldCheckpoints(CLEANUP_COUNT, cleanupBlockNumber);
        
        // First, back out old voting power percentage, if not zero
        if (priorBips != 0) {
            reverseVotePower = _senderCurrentBalance.mulDiv(priorBips, PercentageDelegation.MAX_BIPS);
        }

        // Calculate the new vote power
        if (_bips != 0) {
            newVotePower = _senderCurrentBalance.mulDiv(_bips, PercentageDelegation.MAX_BIPS);
        }

        // Delegate new power
        if (newVotePower < reverseVotePower) {
            // subtraction is safe since newVotePower < reverseVotePower
            votePower.undelegate(_from, _to, reverseVotePower - newVotePower);
        } else {
            // subtraction is safe since newVotePower >= reverseVotePower
            votePower.delegate(_from, _to, newVotePower - reverseVotePower);
        }
        votePower.cleanupOldCheckpoints(_from, CLEANUP_COUNT, cleanupBlockNumber);
        votePower.cleanupOldCheckpoints(_to, CLEANUP_COUNT, cleanupBlockNumber);
        
        // update mode if needed
        if (delegationModes[_from] != DelegationMode.PERCENTAGE) {
            delegationModes[_from] = DelegationMode.PERCENTAGE;
        }

        // emit event for delegation change
        emit Delegate(_from, _to, reverseVotePower, newVotePower);
    }

    /**
     * @notice Get the delegation mode for '_who'. This mode determines whether vote power is
     *  allocated by percentage or by explicit value.
     * @param _who The address to get delegation mode.
     * @return Delegation mode
     */
    function _delegationModeOf(address _who) internal view returns (DelegationMode) {
        return delegationModes[_who];
    }

    /**
    * @notice Get the vote power delegation `delegationAddresses` 
    *  and `_bips` of an `_owner`. Returned in two separate positional arrays.
    * @param _owner The address to get delegations.
    * @param _blockNumber The block for which we want to know the delegations.
    * @return _delegateAddresses Positional array of delegation addresses.
    * @return _bips Positional array of delegation percents specified in basis points (1/100 or 1 percent)
    */
    function _percentageDelegatesOfAt(
        address _owner,
        uint256 _blockNumber
    )
        internal view
        notBeforeCleanupBlock(_blockNumber) 
        returns (
            address[] memory _delegateAddresses, 
            uint256[] memory _bips
        )
    {
        PercentageDelegation.DelegationState storage delegation = percentageDelegations[_owner];
        address[] memory allDelegateAddresses;
        uint256[] memory allBips;
        (allDelegateAddresses, allBips) = delegation.getDelegationsAt(_blockNumber);
        // delete revoked addresses
        for (uint256 i = 0; i < allDelegateAddresses.length; i++) {
            if (votePowerCache.revokedFromToAt(_owner, allDelegateAddresses[i], _blockNumber)) {
                allBips[i] = 0;
            }
        }
        uint256 length = 0;
        for (uint256 i = 0; i < allDelegateAddresses.length; i++) {
            if (allBips[i] != 0) length++;
        }
        _delegateAddresses = new address[](length);
        _bips = new uint256[](length);
        uint256 destIndex = 0;
        for (uint256 i = 0; i < allDelegateAddresses.length; i++) {
            if (allBips[i] != 0) {
                _delegateAddresses[destIndex] = allDelegateAddresses[i];
                _bips[destIndex] = allBips[i];
                destIndex++;
            }
        }
    }

    /**
     * @notice Checks if enough undelegated vote power exists to allow a token
     *  transfer to occur if vote power is explicitly delegated.
     * @param _owner The address of transmittable vote power to check.
     * @param _ownerCurrentBalance The current balance of `_owner`.
     * @param _amount The amount to check.
     * @return True is `_amount` is transmittable.
     */
    function _isTransmittable(
        address _owner, 
        uint256 _ownerCurrentBalance, 
        uint256 _amount
    )
        private view returns(bool)
    {
        // Only proceed if we have a delegation by _amount
        if (delegationModes[_owner] == DelegationMode.AMOUNT) {
            // Return true if there is enough vote power _to cover the transfer
            return _undelegatedVotePowerOf(_owner, _ownerCurrentBalance) >= _amount;
        } else {
            // Not delegated by _amount, so transfer always allowed
            return true;
        }
    }

    /**
     * @notice Mint `_amount` of vote power for `_owner`.
     * @param _owner The address of the owner to receive new vote power.
     * @param _amount The amount of vote power to mint.
     */
    function _mintVotePower(address _owner, uint256 _ownerCurrentBalance, uint256 _amount) internal {
        if (delegationModes[_owner] == DelegationMode.PERCENTAGE) {
            // Allocate newly minted vote power over delegates
            _allocateVotePower(_owner, _ownerCurrentBalance, _ownerCurrentBalance.add(_amount));
        } else {
            votePower.changeValue(_owner, _amount, 0);
            votePower.cleanupOldCheckpoints(_owner, CLEANUP_COUNT, cleanupBlockNumber);
        }
    }
    
    /**
    * @notice Revoke the vote power of `_to` at block `_blockNumber`
    * @param _from The address of the delegator
    * @param _to The delegatee address of vote power to revoke.
    * @param _senderBalanceAt The sender's balance at the block to be revoked.
    * @param _blockNumber The block number at which to revoke.
    */
    function _revokeDelegationAt(
        address _from, 
        address _to, 
        uint256 _senderBalanceAt, 
        uint256 _blockNumber
    )
        internal 
        notBeforeCleanupBlock(_blockNumber)
    {
        require(_blockNumber < block.number, "Revoke is only for the past, use undelegate for the present");
        
        // Get amount revoked
        uint256 votePowerRevoked = _votePowerFromToAtNoRevokeCheck(_from, _to, _senderBalanceAt, _blockNumber);
        
        // Revoke vote power
        votePowerCache.revokeAt(votePower, _from, _to, votePowerRevoked, _blockNumber);

        // Emit revoke event
        emit Revoke(_from, _to, votePowerRevoked, _blockNumber);
    }

    /**
    * @notice Transmit `_amount` of vote power `_from` address `_to` address.
    * @param _from The address of the sender.
    * @param _to The address of the receiver.
    * @param _fromCurrentBalance The current token balance of the transmitter.
    * @param _toCurrentBalance The current token balance of the receiver.
    * @param _amount The amount of vote power to transmit.
    */
    function _transmitVotePower(
        address _from, 
        address _to, 
        uint256 _fromCurrentBalance, 
        uint256 _toCurrentBalance,
        uint256 _amount
    )
        internal
    {
        _burnVotePower(_from, _fromCurrentBalance, _amount);
        _mintVotePower(_to, _toCurrentBalance, _amount);
    }

    /**
     * @notice Undelegate all vote power by percentage for `delegation` of `_who`.
     * @param _from The address of the delegator
     * @param _senderCurrentBalance The current balance of message sender.
     * precondition: delegationModes[_who] == DelegationMode.PERCENTAGE
     */
    function _undelegateAllByPercentage(address _from, uint256 _senderCurrentBalance) internal {
        DelegationMode delegationMode = delegationModes[_from];
        if (delegationMode == DelegationMode.NOTSET) return;
        require(delegationMode == DelegationMode.PERCENTAGE,
            "undelegateAll can only be used in percentage delegation mode");
            
        PercentageDelegation.DelegationState storage delegation = percentageDelegations[_from];
        
        // Iterate over the delegates
        (address[] memory delegates, uint256[] memory _bips) = delegation.getDelegations();
        for (uint256 i = 0; i < delegates.length; i++) {
            address to = delegates[i];
            // Compute vote power to be reversed for the delegate
            uint256 reverseVotePower = _senderCurrentBalance.mulDiv(_bips[i], PercentageDelegation.MAX_BIPS);
            // Transmit vote power back to _owner
            votePower.undelegate(_from, to, reverseVotePower);
            votePower.cleanupOldCheckpoints(_from, CLEANUP_COUNT, cleanupBlockNumber);
            votePower.cleanupOldCheckpoints(to, CLEANUP_COUNT, cleanupBlockNumber);
            // Emit vote power reversal event
            emit Delegate(_from, to, reverseVotePower, 0);
        }

        // Clear delegates
        delegation.clear();
        delegation.cleanupOldCheckpoints(CLEANUP_COUNT, cleanupBlockNumber);
    }

    /**
     * @notice Undelegate all vote power by amount delegates for `_from`.
     * @param _from The address of the delegator
     * @param _delegateAddresses Explicit delegation does not store delegatees' addresses, 
     *   so the caller must supply them.
     */
    function _undelegateAllByAmount(
        address _from,
        address[] memory _delegateAddresses
    ) 
        internal 
        returns (uint256 _remainingDelegation)
    {
        DelegationMode delegationMode = delegationModes[_from];
        if (delegationMode == DelegationMode.NOTSET) return 0;
        require(delegationMode == DelegationMode.AMOUNT,
            "undelegateAllExplicit can only be used in explicit delegation mode");
            
        ExplicitDelegation.DelegationState storage delegation = explicitDelegations[_from];
        
        // Iterate over the delegates
        for (uint256 i = 0; i < _delegateAddresses.length; i++) {
            address to = _delegateAddresses[i];
            // Compute vote power _to be reversed for the delegate
            uint256 reverseVotePower = delegation.getDelegatedValue(to);
            if (reverseVotePower == 0) continue;
            // Transmit vote power back _to _owner
            votePower.undelegate(_from, to, reverseVotePower);
            votePower.cleanupOldCheckpoints(_from, CLEANUP_COUNT, cleanupBlockNumber);
            votePower.cleanupOldCheckpoints(to, CLEANUP_COUNT, cleanupBlockNumber);
            // change delagation
            delegation.addReplaceDelegate(to, 0);
            delegation.cleanupOldCheckpoints(to, CLEANUP_COUNT, cleanupBlockNumber);
            // Emit vote power reversal event
            emit Delegate(_from, to, reverseVotePower, 0);
        }
        
        return delegation.getDelegatedTotal();
    }
    
    /**
     * @notice Check if the `_owner` has made any delegations.
     * @param _owner The address of owner to get delegated vote power.
     * @return The total delegated vote power at block.
     */
    function _hasAnyDelegations(address _owner) internal view returns(bool) {
        DelegationMode delegationMode = delegationModes[_owner];
        if (delegationMode == DelegationMode.NOTSET) {
            return false;
        } else if (delegationMode == DelegationMode.AMOUNT) {
            return explicitDelegations[_owner].getDelegatedTotal() > 0;
        } else { // delegationMode == DelegationMode.PERCENTAGE
            return percentageDelegations[_owner].getCount() > 0;
        }
    }

    /**
     * @notice Get the total delegated vote power of `_owner` at some block.
     * @param _owner The address of owner to get delegated vote power.
     * @param _ownerBalanceAt The balance of the owner at that block (not their vote power).
     * @param _blockNumber The block number at which to fetch.
     * @return _votePower The total delegated vote power at block.
     */
    function _delegatedVotePowerOfAt(
        address _owner, 
        uint256 _ownerBalanceAt,
        uint256 _blockNumber
    ) 
        internal view
        notBeforeCleanupBlock(_blockNumber)
        returns(uint256 _votePower)
    {
        // Get the vote power delegation for the _owner
        DelegationMode delegationMode = delegationModes[_owner];
        if (delegationMode == DelegationMode.NOTSET) {
            return 0;
        } else if (delegationMode == DelegationMode.AMOUNT) {
            return explicitDelegations[_owner].getDelegatedTotalAt(_blockNumber);
        } else { // delegationMode == DelegationMode.PERCENTAGE
            return percentageDelegations[_owner].getDelegatedTotalAmountAt(_ownerBalanceAt, _blockNumber);
        }
    }

    /**
     * @notice Get the undelegated vote power of `_owner` at some block.
     * @param _owner The address of owner to get undelegated vote power.
     * @param _ownerBalanceAt The balance of the owner at that block (not their vote power).
     * @param _blockNumber The block number at which to fetch.
     * @return _votePower The undelegated vote power at block.
     */
    function _undelegatedVotePowerOfAt(
        address _owner, 
        uint256 _ownerBalanceAt,
        uint256 _blockNumber
    ) 
        internal view 
        notBeforeCleanupBlock(_blockNumber) 
        returns(uint256 _votePower)
    {
        // Return the current balance less delegations or zero if negative
        uint256 delegated = _delegatedVotePowerOfAt(_owner, _ownerBalanceAt, _blockNumber);
        bool overflow;
        uint256 result;
        (overflow, result) = _ownerBalanceAt.trySub(delegated);
        return result;
    }

    /**
     * @notice Get the undelegated vote power of `_owner`.
     * @param _owner The address of owner to get undelegated vote power.
     * @param _ownerCurrentBalance The current balance of the owner (not their vote power).
     * @return _votePower The undelegated vote power.
     */
    function _undelegatedVotePowerOf(
        address _owner, 
        uint256 _ownerCurrentBalance
    ) 
        internal view 
        returns(uint256 _votePower)
    {
        return _undelegatedVotePowerOfAt(_owner, _ownerCurrentBalance, block.number);
    }
    
    /**
    * @notice Get current delegated vote power `_from` delegator delegated `_to` delegatee.
    * @param _from Address of delegator
    * @param _to Address of delegatee
    * @return _votePower The delegated vote power.
    */
    function _votePowerFromTo(
        address _from, 
        address _to, 
        uint256 _currentFromBalance
    ) 
        internal view 
        returns(uint256 _votePower)
    {
        DelegationMode delegationMode = delegationModes[_from];
        if (delegationMode == DelegationMode.NOTSET) {
            return 0;
        } else if (delegationMode == DelegationMode.PERCENTAGE) {
            uint256 _bips = percentageDelegations[_from].getDelegatedValue(_to);
            return _currentFromBalance.mulDiv(_bips, PercentageDelegation.MAX_BIPS);
        } else { // delegationMode == DelegationMode.AMOUNT
            return explicitDelegations[_from].getDelegatedValue(_to);
        }
    }

    /**
    * @notice Get delegated the vote power `_from` delegator delegated `_to` delegatee at `_blockNumber`.
    * @param _from Address of delegator
    * @param _to Address of delegatee
    * @param _fromBalanceAt From's balance at the block `_blockNumber`.
    * @param _blockNumber The block number at which to fetch.
    * @return _votePower The delegated vote power.
    */
    function _votePowerFromToAt(
        address _from, 
        address _to, 
        uint256 _fromBalanceAt, 
        uint256 _blockNumber
    ) 
        internal view 
        notBeforeCleanupBlock(_blockNumber) 
        returns(uint256 _votePower) 
    {
        // if revoked, return 0
        if (votePowerCache.revokedFromToAt(_from, _to, _blockNumber)) return 0;
        return _votePowerFromToAtNoRevokeCheck(_from, _to, _fromBalanceAt, _blockNumber);
    }

    /**
    * @notice Get delegated the vote power `_from` delegator delegated `_to` delegatee at `_blockNumber`.
    *   Private use only - ignores revocations.
    * @param _from Address of delegator
    * @param _to Address of delegatee
    * @param _fromBalanceAt From's balance at the block `_blockNumber`.
    * @param _blockNumber The block number at which to fetch.
    * @return _votePower The delegated vote power.
    */
    function _votePowerFromToAtNoRevokeCheck(
        address _from, 
        address _to, 
        uint256 _fromBalanceAt, 
        uint256 _blockNumber
    )
        private view 
        returns(uint256 _votePower)
    {
        // assumed: notBeforeCleanupBlock(_blockNumber)
        DelegationMode delegationMode = delegationModes[_from];
        if (delegationMode == DelegationMode.NOTSET) {
            return 0;
        } else if (delegationMode == DelegationMode.PERCENTAGE) {
            uint256 _bips = percentageDelegations[_from].getDelegatedValueAt(_to, _blockNumber);
            return _fromBalanceAt.mulDiv(_bips, PercentageDelegation.MAX_BIPS);
        } else { // delegationMode == DelegationMode.AMOUNT
            return explicitDelegations[_from].getDelegatedValueAt(_to, _blockNumber);
        }
    }

    /**
     * @notice Get the current vote power of `_who`.
     * @param _who The address to get voting power.
     * @return Current vote power of `_who`.
     */
    function _votePowerOf(address _who) internal view returns(uint256) {
        return votePower.votePowerOfAtNow(_who);
    }

    /**
    * @notice Get the vote power of `_who` at block `_blockNumber`
    * @param _who The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_who` at `_blockNumber`.
    */
    function _votePowerOfAt(
        address _who, 
        uint256 _blockNumber
    )
        internal view 
        notBeforeCleanupBlock(_blockNumber) 
        returns(uint256)
    {
        // read cached value for past blocks to respect revocations (and possibly get a cache speedup)
        if (_blockNumber < block.number) {
            return votePowerCache.valueOfAtReadonly(votePower, _who, _blockNumber);
        } else {
            return votePower.votePowerOfAtNow(_who);
        }
    }

    /**
    * @notice Get the vote power of `_who` at block `_blockNumber`, ignoring revocation information (and cache).
    * @param _who The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_who` at `_blockNumber`. Result doesn't change if vote power is revoked.
    */
    function _votePowerOfAtIgnoringRevocation(
        address _who, 
        uint256 _blockNumber
    )
        internal view 
        notBeforeCleanupBlock(_blockNumber) 
        returns(uint256)
    {
        return votePower.votePowerOfAt(_who, _blockNumber);
    }

    /**
     * Return vote powers for several addresses in a batch.
     * Only works for past blocks.
     * @param _owners The list of addresses to fetch vote power of.
     * @param _blockNumber The block number at which to fetch.
     * @return _votePowers A list of vote powers corresponding to _owners.
     */    
    function _batchVotePowerOfAt(
        address[] memory _owners, 
        uint256 _blockNumber
    ) 
        internal view 
        notBeforeCleanupBlock(_blockNumber) 
        returns(uint256[] memory _votePowers)
    {
        require(_blockNumber < block.number, "Can only be used for past blocks");
        _votePowers = new uint256[](_owners.length);
        for (uint256 i = 0; i < _owners.length; i++) {
            // read through cache, much faster if it has been set
            _votePowers[i] = votePowerCache.valueOfAtReadonly(votePower, _owners[i], _blockNumber);
        }
    }
    
    /**
    * @notice Get the vote power of `_who` at block `_blockNumber`
    *   Reads/updates cache and upholds revocations.
    * @param _who The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_who` at `_blockNumber`.
    */
    function _votePowerOfAtCached(
        address _who, 
        uint256 _blockNumber
    )
        internal 
        notBeforeCleanupBlock(_blockNumber)
        returns(uint256) 
    {
        require(_blockNumber < block.number, "Can only be used for past blocks");
        (uint256 vp, bool createdCache) = votePowerCache.valueOfAt(votePower, _who, _blockNumber);
        if (createdCache) emit CreatedVotePowerCache(_who, _blockNumber);
        return vp;
    }
    
    /**
     * Set the cleanup block number.
     */
    function _setCleanupBlockNumber(uint256 _blockNumber) internal {
        require(_blockNumber >= cleanupBlockNumber, "Cleanup block number must never decrease");
        require(_blockNumber < block.number, "Cleanup block must be in the past");
        cleanupBlockNumber = _blockNumber;
    }

    /**
     * Get the cleanup block number.
     */
    function _cleanupBlockNumber() internal view returns (uint256) {
        return cleanupBlockNumber;
    }
    
    /**
     * Set the contract that is allowed to call history cleaning methods.
     */
    function _setCleanerContract(address _cleanerContract) internal {
        cleanerContract = _cleanerContract;
    }
    
    // history cleanup methods
    
    /**
     * Delete vote power checkpoints that expired (i.e. are before `cleanupBlockNumber`).
     * Method can only be called from the `cleanerContract` (which may be a proxy to external cleaners).
     * @param _owner vote power owner account address
     * @param _count maximum number of checkpoints to delete
     * @return the number of checkpoints deleted
     */    
    function votePowerHistoryCleanup(address _owner, uint256 _count) external onlyCleaner returns (uint256) {
        return votePower.cleanupOldCheckpoints(_owner, _count, cleanupBlockNumber);
    }

    /**
     * Delete vote power cache entry that expired (i.e. is before `cleanupBlockNumber`).
     * Method can only be called from the `cleanerContract` (which may be a proxy to external cleaners).
     * @param _owner vote power owner account address
     * @param _blockNumber the block number for which total supply value was cached
     * @return the number of cache entries deleted (always 0 or 1)
     */    
    function votePowerCacheCleanup(address _owner, uint256 _blockNumber) external onlyCleaner returns (uint256) {
        require(_blockNumber < cleanupBlockNumber, "No cleanup after cleanup block");
        return votePowerCache.deleteValueAt(_owner, _blockNumber);
    }

    /**
     * Delete revocation entry that expired (i.e. is before `cleanupBlockNumber`).
     * Method can only be called from the `cleanerContract` (which may be a proxy to external cleaners).
     * @param _from the delegator address
     * @param _to the delegatee address
     * @param _blockNumber the block number for which total supply value was cached
     * @return the number of revocation entries deleted (always 0 or 1)
     */    
    function revocationCleanup(
        address _from, 
        address _to, 
        uint256 _blockNumber
    )
        external onlyCleaner 
        returns (uint256)
    {
        require(_blockNumber < cleanupBlockNumber, "No cleanup after cleanup block");
        return votePowerCache.deleteRevocationAt(_from, _to, _blockNumber);
    }
    
    /**
     * Delete percentage delegation checkpoints that expired (i.e. are before `cleanupBlockNumber`).
     * Method can only be called from the `cleanerContract` (which may be a proxy to external cleaners).
     * @param _owner balance owner account address
     * @param _count maximum number of checkpoints to delete
     * @return the number of checkpoints deleted
     */    
    function percentageDelegationHistoryCleanup(address _owner, uint256 _count)
        external onlyCleaner 
        returns (uint256)
    {
        return percentageDelegations[_owner].cleanupOldCheckpoints(_count, cleanupBlockNumber);
    }
    
    /**
     * Delete explicit delegation checkpoints that expired (i.e. are before `cleanupBlockNumber`).
     * Method can only be called from the `cleanerContract` (which may be a proxy to external cleaners).
     * @param _from the delegator address
     * @param _to the delegatee address
     * @param _count maximum number of checkpoints to delete
     * @return the number of checkpoints deleted
     */    
    function explicitDelegationHistoryCleanup(address _from, address _to, uint256 _count)
        external
        onlyCleaner 
        returns (uint256)
    {
        return explicitDelegations[_from].cleanupOldCheckpoints(_to, _count, cleanupBlockNumber);
    }
}
          

./contracts/token/implementation/CheckPointable.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
import "../lib/CheckPointHistory.sol";
import "../lib/CheckPointsByAddress.sol";
import "../lib/CheckPointHistoryCache.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
 
/**
 * @title Check Pointable ERC20 Behavior
 * @notice ERC20 behavior which adds balance check point features.
 **/
abstract contract CheckPointable {
    using CheckPointHistory for CheckPointHistory.CheckPointHistoryState;
    using CheckPointsByAddress for CheckPointsByAddress.CheckPointsByAddressState;
    using CheckPointHistoryCache for CheckPointHistoryCache.CacheState;
    using SafeMath for uint256;

    // The number of history cleanup steps executed for every write operation.
    // It is more than 1 to make as certain as possible that all history gets cleaned eventually.
    uint256 private constant CLEANUP_COUNT = 2;
    
    // Private member variables
    CheckPointsByAddress.CheckPointsByAddressState private balanceHistory;
    CheckPointHistory.CheckPointHistoryState private totalSupply;
    CheckPointHistoryCache.CacheState private totalSupplyCache;

    // Historic data for the blocks before `cleanupBlockNumber` can be erased,
    // history before that block should never be used since it can be inconsistent.
    uint256 private cleanupBlockNumber;
    
    // Address of the contract that is allowed to call methods for history cleaning.
    address public cleanerContract;
    
    /**
     * Emitted when a total supply cache entry is created.
     * Allows history cleaners to track total supply cache cleanup opportunities off-chain.
     */
    event CreatedTotalSupplyCache(uint256 _blockNumber);
    
    // Most cleanup opportunities can be deduced from standard event 
    // Transfer(from, to, amount):
    //   - balance history for `from` (if nonzero) and `to` (if nonzero)
    //   - total supply history when either `from` or `to` is zero
    
    modifier notBeforeCleanupBlock(uint256 _blockNumber) {
        require(_blockNumber >= cleanupBlockNumber, "CheckPointable: reading from cleaned-up block");
        _;
    }
    
    modifier onlyCleaner {
        require(msg.sender == cleanerContract, "Only cleaner contract");
        _;
    }
    
    /**
     * @dev Queries the token balance of `_owner` at a specific `_blockNumber`.
     * @param _owner The address from which the balance will be retrieved.
     * @param _blockNumber The block number when the balance is queried.
     * @return _balance The balance at `_blockNumber`.
     **/
    function balanceOfAt(address _owner, uint256 _blockNumber)
        public virtual view 
        notBeforeCleanupBlock(_blockNumber) 
        returns (uint256 _balance)
    {
        return balanceHistory.valueOfAt(_owner, _blockNumber);
    }

    /**
     * @notice Burn current token `amount` for `owner` of checkpoints at current block.
     * @param _owner The address of the owner to burn tokens.
     * @param _amount The amount to burn.
     */
    function _burnForAtNow(address _owner, uint256 _amount) internal virtual {
        uint256 newBalance = balanceOfAt(_owner, block.number).sub(_amount, "Burn too big for owner");
        balanceHistory.writeValue(_owner, newBalance);
        balanceHistory.cleanupOldCheckpoints(_owner, CLEANUP_COUNT, cleanupBlockNumber);
        totalSupply.writeValue(totalSupplyAt(block.number).sub(_amount, "Burn too big for total supply"));
        totalSupply.cleanupOldCheckpoints(CLEANUP_COUNT, cleanupBlockNumber);
    }

    /**
     * @notice Mint current token `amount` for `owner` of checkpoints at current block.
     * @param _owner The address of the owner to burn tokens.
     * @param _amount The amount to burn.
     */
    function _mintForAtNow(address _owner, uint256 _amount) internal virtual {
        uint256 newBalance = balanceOfAt(_owner, block.number).add(_amount);
        balanceHistory.writeValue(_owner, newBalance);
        balanceHistory.cleanupOldCheckpoints(_owner, CLEANUP_COUNT, cleanupBlockNumber);
        totalSupply.writeValue(totalSupplyAt(block.number).add(_amount));
        totalSupply.cleanupOldCheckpoints(CLEANUP_COUNT, cleanupBlockNumber);
    }

    /**
     * @notice Total amount of tokens at a specific `_blockNumber`.
     * @param _blockNumber The block number when the _totalSupply is queried
     * @return _totalSupply The total amount of tokens at `_blockNumber`
     **/
    function totalSupplyAt(uint256 _blockNumber)
        public virtual view 
        notBeforeCleanupBlock(_blockNumber)
        returns(uint256 _totalSupply)
    {
        return totalSupply.valueAt(_blockNumber);
    }

    /**
     * @notice Total amount of tokens at a specific `_blockNumber`.
     * @param _blockNumber The block number when the _totalSupply is queried
     * @return _totalSupply The total amount of tokens at `_blockNumber`
     **/
    function _totalSupplyAtCached(uint256 _blockNumber) internal 
        notBeforeCleanupBlock(_blockNumber)
        returns(uint256 _totalSupply)
    {
        // use cache only for the past (the value will never change)
        require(_blockNumber < block.number, "Can only be used for past blocks");
        (uint256 value, bool cacheCreated) = totalSupplyCache.valueAt(totalSupply, _blockNumber);
        if (cacheCreated) emit CreatedTotalSupplyCache(_blockNumber);
        return value;
    }

    /**
     * @notice Transmit token `_amount` `_from` address `_to` address of checkpoints at current block.
     * @param _from The address of the sender.
     * @param _to The address of the receiver.
     * @param _amount The amount to transmit.
     */
    function _transmitAtNow(address _from, address _to, uint256 _amount) internal virtual {
        balanceHistory.transmit(_from, _to, _amount);
        balanceHistory.cleanupOldCheckpoints(_from, CLEANUP_COUNT, cleanupBlockNumber);
        balanceHistory.cleanupOldCheckpoints(_to, CLEANUP_COUNT, cleanupBlockNumber);
    }
    
    /**
     * Set the cleanup block number.
     */
    function _setCleanupBlockNumber(uint256 _blockNumber) internal {
        require(_blockNumber >= cleanupBlockNumber, "Cleanup block number must never decrease");
        require(_blockNumber < block.number, "Cleanup block must be in the past");
        cleanupBlockNumber = _blockNumber;
    }

    /**
     * Get the cleanup block number.
     */
    function _cleanupBlockNumber() internal view returns (uint256) {
        return cleanupBlockNumber;
    }
    
    /**
     * @notice Update history at token transfer, the CheckPointable part of `_beforeTokenTransfer` hook.
     * @param _from The address of the sender.
     * @param _to The address of the receiver.
     * @param _amount The amount to transmit.
     */
    function _updateBalanceHistoryAtTransfer(address _from, address _to, uint256 _amount) internal virtual {
        if (_from == address(0)) {
            // mint checkpoint balance data for transferee
            _mintForAtNow(_to, _amount);
        } else if (_to == address(0)) {
            // burn checkpoint data for transferer
            _burnForAtNow(_from, _amount);
        } else {
            // transfer checkpoint balance data
            _transmitAtNow(_from, _to, _amount);
        }
    }

    // history cleanup methods

    /**
     * Set the contract that is allowed to call history cleaning methods.
     */
    function _setCleanerContract(address _cleanerContract) internal {
        cleanerContract = _cleanerContract;
    }

    /**
     * Delete balance checkpoints that expired (i.e. are before `cleanupBlockNumber`).
     * Method can only be called from the `cleanerContract` (which may be a proxy to external cleaners).
     * @param _owner balance owner account address
     * @param _count maximum number of checkpoints to delete
     * @return the number of checkpoints deleted
     */    
    function balanceHistoryCleanup(address _owner, uint256 _count) external onlyCleaner returns (uint256) {
        return balanceHistory.cleanupOldCheckpoints(_owner, _count, cleanupBlockNumber);
    }
    
    /**
     * Delete total supply checkpoints that expired (i.e. are before `cleanupBlockNumber`).
     * Method can only be called from the `cleanerContract` (which may be a proxy to external cleaners).
     * @param _count maximum number of checkpoints to delete
     * @return the number of checkpoints deleted
     */    
    function totalSupplyHistoryCleanup(uint256 _count) external onlyCleaner returns (uint256) {
        return totalSupply.cleanupOldCheckpoints(_count, cleanupBlockNumber);
    }
    
    /**
     * Delete total supply cache entry that expired (i.e. is before `cleanupBlockNumber`).
     * Method can only be called from the `cleanerContract` (which may be a proxy to external cleaners).
     * @param _blockNumber the block number for which total supply value was cached
     * @return the number of cache entries deleted (always 0 or 1)
     */    
    function totalSupplyCacheCleanup(uint256 _blockNumber) external onlyCleaner returns (uint256) {
        require(_blockNumber < cleanupBlockNumber, "No cleanup after cleanup block");
        return totalSupplyCache.deleteAt(_blockNumber);
    }
}
          

./contracts/addressUpdater/interface/IIAddressUpdatable.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;


interface IIAddressUpdatable {
    /**
     * @notice Updates contract addresses - should be called only from AddressUpdater contract
     * @param _contractNameHashes       list of keccak256(abi.encode(...)) contract names
     * @param _contractAddresses        list of contract addresses corresponding to the contract names
     */
    function updateContractAddresses(
        bytes32[] memory _contractNameHashes,
        address[] memory _contractAddresses
        ) external;
}
          

./contracts/utils/implementation/SafePct.sol

// SPDX-License-Identifier: MIT

pragma solidity 0.7.6;
import {SafeMath} from "@openzeppelin/contracts/math/SafeMath.sol";

/**
 * @dev Compute percentages safely without phantom overflows.
 *
 * Intermediate operations can overflow even when the result will always
 * fit into computed type. Developers usually
 * assume that overflows raise errors. `SafePct` restores this intuition by
 * reverting the transaction when such an operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 *
 * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing
 * all math on `uint256` and `int256` and then downcasting.
 */
library SafePct {
    using SafeMath for uint256;
    /**
     * Requirements:
     *
     * - intermediate operations must revert on overflow
     */
    function mulDiv(uint256 x, uint256 y, uint256 z) internal pure returns (uint256) {
        require(z > 0, "Division by zero");

        if (x == 0) return 0;
        uint256 xy = x * y;
        if (xy / x == y) { // no overflow happened - same as in SafeMath mul
            return xy / z;
        }

        //slither-disable-next-line divide-before-multiply
        uint256 a = x / z;
        uint256 b = x % z; // x = a * z + b

        //slither-disable-next-line divide-before-multiply
        uint256 c = y / z;
        uint256 d = y % z; // y = c * z + d

        return (a.mul(c).mul(z)).add(a.mul(d)).add(b.mul(c)).add(b.mul(d).div(z));
    }
}
          

./contracts/personalDelegation/implementation/DelegationAccountClonable.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "../interface/IDelegationAccount.sol";
import "./DelegationAccountManager.sol";

contract DelegationAccountClonable is IDelegationAccount {

    string internal constant CLAIM_FAILURE = "unknown error when claiming";
    string internal constant UNCLAIMED_EPOCHS_FAILURE = "unknown error when claiming";

    address public owner;
    DelegationAccountManager public manager;

    mapping(address => bool) public isExecutor;

    /**
     * Some external methods in DelegationAccount contract can only be executed by the owner account.
     */
    modifier onlyOwner {
        require(msg.sender == owner, "only owner account");
        _;
    }

    /**
     * Some external methods in DelegationAccount contract can only be executed by the owner 
    or executor account.
     */
    modifier onlyOwnerOrExecutor {
        require(msg.sender == owner || isExecutor[msg.sender], "only owner or executor account");
        _;
    }

    receive() external payable {
        manager.wNat().deposit{value: msg.value}();
    }

    function initialize(address _owner, DelegationAccountManager _manager) external {
        require(address(owner) == address(0), "owner already set");
        require(address(_owner) != address(0), "owner address missing");
        owner = _owner;
        manager = _manager;
        emit Initialize(owner, _manager);
    }
    
    /**
     * @notice Allows user to claim ftso rewards for his delegation contract account
     * @param _epochs            epochs for which user wants to claim rewards
     * @dev Reverts if `msg.sender` is not an owner or executor
     */
    function claimFtsoRewards(uint256[] memory _epochs) external override onlyOwnerOrExecutor returns(uint256) {
        uint256 amount;
        IIFtsoRewardManager[] memory rewardManagers = manager.getFtsoRewardManagers();
        for(uint256 i=0; i < rewardManagers.length; i++) {
            try rewardManagers[i].claimReward(address(this), _epochs) returns (uint256 _amount) {
                amount += _amount;
                emit ClaimFtsoRewards(address(this), _epochs, _amount, rewardManagers[i]);
            } catch Error(string memory _err) {
                emit ClaimFtsoFailure(_err, rewardManagers[i]);
            } catch {
                emit ClaimFtsoFailure(CLAIM_FAILURE, rewardManagers[i]);
            }
        }
        return amount;
    }

    /**
     * @notice Allows user to claim all unclaimed ftso rewards for his delegation contract account
     * @dev Reverts if `msg.sender` is not an owner or executor
     */
    function claimAllFtsoRewards() external override onlyOwnerOrExecutor returns(uint256) {
        uint256 amount;
        IIFtsoRewardManager[] memory rewardManagers = manager.getFtsoRewardManagers();
        for(uint256 i = 0; i < rewardManagers.length; i++) {
            try rewardManagers[i].getEpochsWithUnclaimedRewards(address(this)) returns(uint256[] memory epochs) {
                try rewardManagers[i].claimReward(address(this), epochs) returns (uint256 _amount) {
                    amount += _amount;
                    emit ClaimFtsoRewards(address(this), epochs, _amount, rewardManagers[i]);
                } catch Error(string memory _err) {
                    emit ClaimFtsoFailure(_err, rewardManagers[i]);
                } catch {
                    emit ClaimFtsoFailure(CLAIM_FAILURE, rewardManagers[i]);
                }
            } catch Error(string memory _err) {
                    emit EpochsWithUnclaimedRewardsFailure(_err, rewardManagers[i]);
            } catch {
                    emit EpochsWithUnclaimedRewardsFailure(UNCLAIMED_EPOCHS_FAILURE, rewardManagers[i]);
            }
        }
        return amount;
    }

    function claimAirdropDistribution(uint256 _month) external override onlyOwnerOrExecutor returns(uint256) {
        uint256 amount;
        IDistributionToDelegators[] memory distributions = manager.getDistributions();
        for(uint256 i = 0; i < distributions.length; i++) {
            try distributions[i].claim(address(this), _month) returns (uint256 _amount) {
                if (_amount > 0) {
                    amount += _amount;
                    emit ClaimAirdrop(address(this), _amount, _month, distributions[i]);
                }
            } catch Error(string memory _err) {
                emit ClaimDistributionFailure(_err, distributions[i]);
            } catch {
                emit ClaimDistributionFailure(CLAIM_FAILURE, distributions[i]);
            }
        }
        return amount;
    }

    function claimAllUnclaimedAirdropDistribution() external onlyOwnerOrExecutor returns(uint256) {
        uint256 amount;
        IDistributionToDelegators[] memory distributions = manager.getDistributions();
        for(uint256 i = 0; i < distributions.length; i++) {
            uint256 _amount = _claimAirdrop(distributions[i]);
            amount += _amount;
        }
        return amount;
    }

    function delegate(address _to, uint256 _bips) external override onlyOwner { 
        manager.wNat().delegate(_to, _bips);
        emit DelegateFtso(address(this), _to, _bips);
    }

    function undelegateAll() external override onlyOwner {
        manager.wNat().undelegateAll();
        emit UndelegateAllFtso(address(this));
    }

    function revokeDelegationAt(address _who, uint256 _blockNumber) external override onlyOwner {
        manager.wNat().revokeDelegationAt(_who, _blockNumber);
    }

    function delegateGovernance(address _to) external override onlyOwner { 
        manager.governanceVP().delegate(_to);
        emit DelegateGovernance(address(this), _to, manager.wNat().balanceOf(address(this)));
    }

    function undelegateGovernance() external override onlyOwner {
        manager.governanceVP().undelegate();
        emit UndelegateGovernance(address(this));
    }

    function setExecutor(address _executor) external override onlyOwner {
        isExecutor[_executor] = true;
        emit SetExecutor(address(this), _executor);
    }

    function removeExecutor(address _executor) external override onlyOwner {
        isExecutor[_executor] = false;
        emit RemoveExecutor(address(this), _executor);
    }

    function withdraw(uint256 _amount) external override onlyOwner {
        bool returnValue = manager.wNat().transfer(owner, _amount);
        require(returnValue == true, "transfer failed");
        emit WidthrawToOwner(address(this), _amount);
    }

    /**
     * @notice Allows user to transfer balance of ERC20 tokens owned by the personal delegation contract.
     The main use case is to transfer tokens/NFTs that were received as part of an airdrop or register 
     as participant in such airdrop.
     * @param _token            Target token contract address
     * @param _amount           Amount of tokens to transfer
     * @dev Reverts if `msg.sender` is not an owner or the target token in WNat contract
     */
    function transferExternalToken(IERC20 _token, uint256 _amount) external override onlyOwner {
        require(address(_token) != address(manager.wNat()), "Transfer from wNat not allowed");
        bool returnValue = _token.transfer(owner, _amount);
        require(returnValue == true, "transfer failed");
    }
    
    function _claimAirdrop(IDistributionToDelegators _distribution) internal returns (uint256) {
        uint maxMonth = Math.min(_distribution.getCurrentMonth(), 36);
        uint256 amount;
        for (uint256 month = _distribution.getMonthToExpireNext(); month < maxMonth; month++) {
            try _distribution.claim(address(this), month) returns (uint256 _amount) {
                if (_amount > 0) {
                    amount += _amount;
                    emit ClaimAirdrop(address(this), _amount, month, _distribution);
                }
            } catch Error(string memory _err) {
                emit ClaimDistributionFailure(_err, _distribution);
            } catch {
                emit ClaimDistributionFailure(CLAIM_FAILURE, _distribution);
            }
        }
        return amount;
    }
}
          

./contracts/token/interface/IICleanable.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

interface IICleanable {
    /**
     * Set the contract that is allowed to call history cleaning methods.
     */
    function setCleanerContract(address _cleanerContract) external;
    
    /**
     * Set the cleanup block number.
     * Historic data for the blocks before `cleanupBlockNumber` can be erased,
     * history before that block should never be used since it can be inconsistent.
     * In particular, cleanup block number must be before current vote power block.
     * @param _blockNumber The new cleanup block number.
     */
    function setCleanupBlockNumber(uint256 _blockNumber) external;
    
    /**
     * Get the current cleanup block number.
     */
    function cleanupBlockNumber() external view returns (uint256);
}
          

@openzeppelin/contracts/utils/ReentrancyGuard.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
          

./contracts/personalDelegation/interface/IDelegationAccountManager.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

import "../../tokenPools/interface/IIFtsoRewardManager.sol";
import "../../userInterfaces/IDistributionToDelegators.sol";
import "../implementation/DelegationAccountClonable.sol";

interface IDelegationAccountManager {

    event SetLibraryAddress(address libraryAddress);
    event CreateDelegationAccount(address delegationAccount, address owner);

    function setLibraryAddress(address _libraryAddress) external;

    function createDelegationAccount() external returns (DelegationAccountClonable);

    function getFtsoRewardManagers() external view returns(IIFtsoRewardManager[] memory);

    function getDistributions() external view returns(IDistributionToDelegators[] memory);

}
          

./contracts/genesis/implementation/DistributionTreasury.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "../../governance/implementation/GovernedAtGenesis.sol";


/**
 * @title Distribution treasury
 * @notice A genesis contract used to hold funds until the distribution plan is chosen.
 */
contract DistributionTreasury is GovernedAtGenesis {

    // How often can the distribution contract pull funds - 29 days constant
    uint256 internal constant MAX_PULL_FREQUENCY_SEC = 29 days;
    uint256 public constant MAX_PULL_AMOUNT_WEI = 725000000 ether;

    // Errors
    string internal constant ERR_DISTRIBUTION_ONLY = "distribution only";
    string internal constant ERR_TOO_OFTEN = "too often";
    string internal constant ERR_TOO_MUCH = "too much";
    string internal constant ERR_SEND_FUNDS_FAILED = "send funds failed";
    string internal constant ERR_ALREADY_SET = "already set";
    string internal constant ERR_WRONG_ADDRESS = "wrong address";
    string internal constant ERR_ADDRESS_ZERO = "address zero";

    // Storage
    address public selectedDistribution;
    address public initialDistribution;
    address public distributionToDelegators;
    uint256 public lastPullTs;


    modifier onlyDistributionToDelegators {
        require (msg.sender == selectedDistribution && msg.sender == distributionToDelegators, ERR_DISTRIBUTION_ONLY);
        _;
    }

    /**
     * @dev This constructor should contain no code as this contract is pre-loaded into the genesis block.
     *   The super constructor is called for testing convenience.
     */
    constructor() GovernedAtGenesis(address(0)) {
        /* empty block */
    }

    /**
     * @notice Sets both distribution contract addresses.
     * @param _initialDistribution          Initial distribution contract address.
     * @param _distributionToDelegators     Distribution to delegators contracts address.
     */
    function setContracts(address _initialDistribution, address _distributionToDelegators) external onlyGovernance {
        require(initialDistribution == address(0) && distributionToDelegators == address(0), ERR_ALREADY_SET);
        require(_initialDistribution != address(0) && _distributionToDelegators != address(0), ERR_ADDRESS_ZERO);
        initialDistribution = _initialDistribution;
        distributionToDelegators = _distributionToDelegators;
    }

    /**
     * @notice Selects one of the two distribution contracts
     * @param _selectedDistribution         Selected distribution contract address.
     */
    function selectDistributionContract(address _selectedDistribution) external onlyGovernance {
        require(selectedDistribution == address(0), ERR_ALREADY_SET);
        require(_selectedDistribution == initialDistribution || _selectedDistribution == distributionToDelegators, 
            ERR_WRONG_ADDRESS);
        selectedDistribution = _selectedDistribution;
        if (_selectedDistribution == initialDistribution) {
            // send funds
            _sendFunds(_selectedDistribution, address(this).balance);
        }
    }

    /**
     * @notice Moves funds to the distribution contract (once per month)
     * @param _amountWei   The amount of wei to pull to distribution contract
     */
    function pullFunds(uint256 _amountWei) external onlyDistributionToDelegators {
        // this also serves as reentrancy guard, since any re-entry will happen in the same block
        require(lastPullTs + MAX_PULL_FREQUENCY_SEC <= block.timestamp, ERR_TOO_OFTEN);
        require(_amountWei <= MAX_PULL_AMOUNT_WEI, ERR_TOO_MUCH);
        lastPullTs = block.timestamp;
        _sendFunds(msg.sender, _amountWei);
    }

    function _sendFunds(address _recipient, uint256 _amountWei) internal {
        /* solhint-disable avoid-low-level-calls */
        //slither-disable-next-line arbitrary-send
        (bool success, ) = _recipient.call{value: _amountWei}("");
        /* solhint-enable avoid-low-level-calls */
        require(success, ERR_SEND_FUNDS_FAILED);
    }
}
          

./contracts/userInterfaces/IWNat.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

interface IWNat {
    /**
     * @notice Deposit native token and mint WNAT ERC20.
     */
    function deposit() external payable;

    /**
     * @notice Withdraw native token and burn WNAT ERC20.
     * @param _amount The amount to withdraw.
     */
    function withdraw(uint256 _amount) external;
    
    /**
     * @notice Deposit native token from msg.sender and mint WNAT ERC20.
     * @param _recipient An address to receive minted WNAT.
     */
    function depositTo(address _recipient) external payable;
    
    /**
     * @notice Withdraw WNAT from an owner and send NAT to msg.sender given an allowance.
     * @param _owner An address spending the native tokens.
     * @param _amount The amount to spend.
     *
     * Requirements:
     *
     * - `_owner` must have a balance of at least `_amount`.
     * - the caller must have allowance for `_owners`'s tokens of at least
     * `_amount`.
     */
    function withdrawFrom(address _owner, uint256 _amount) external;
}
          

./contracts/token/implementation/WNat.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "./VPToken.sol";
import "./VPContract.sol";
import "../../userInterfaces/IWNat.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";

/**
 * @title Wrapped Native token
 * @notice Accept native token deposits and mint ERC20 WNAT (wrapped native) tokens 1-1.
 * @dev Attribution: https://rinkeby.etherscan.io/address/0xc778417e063141139fce010982780140aa0cd5ab#code 
 */
contract WNat is VPToken, IWNat {
    using SafeMath for uint256;
    event  Deposit(address indexed dst, uint amount);
    event  Withdrawal(address indexed src, uint amount);

    /**
     * Construct an ERC20 token.
     */
    constructor(address _governance, string memory _name, string memory _symbol) 
        VPToken(_governance, _name, _symbol) 
    {
    }

    receive() external payable {
        deposit();
    }

    /**
     * @notice Withdraw WNAT from an owner and send native tokens to msg.sender given an allowance.
     * @param owner An address spending the Native tokens.
     * @param amount The amount to spend.
     *
     * Requirements:
     *
     * - `owner` must have a balance of at least `amount`.
     * - the caller must have allowance for `owners`'s tokens of at least
     * `amount`.
     */
    function withdrawFrom(address owner, uint256 amount) external override {
        // Reduce senders allowance
        _approve(owner, msg.sender, allowance(owner, msg.sender).sub(amount, "allowance below zero"));
        // Burn the owners balance
        _burn(owner, amount);
        // Emit withdraw event
        emit Withdrawal(owner, amount);
        // Move value to sender (last statement, to prevent reentrancy)
        msg.sender.transfer(amount);
    }

    /**
     * @notice Deposit Native from msg.sender and mints WNAT ERC20 to recipient address.
     * @param recipient An address to receive minted WNAT.
     */
    function depositTo(address recipient) external payable override {
        require(recipient != address(0), "Cannot deposit to zero address");
        // Mint WNAT
        _mint(recipient, msg.value);
        // Emit deposit event
        emit Deposit(recipient, msg.value);
    }

    /**
     * @notice Deposit Native and mint wNat ERC20.
     */
    function deposit() public payable override {
        // Mint WNAT
        _mint(msg.sender, msg.value);
        // Emit deposit event
        emit Deposit(msg.sender, msg.value);
    }

    /**
     * @notice Withdraw Native and burn WNAT ERC20.
     * @param amount The amount to withdraw.
     */
    function withdraw(uint256 amount) external override {
        // Burn WNAT tokens
        _burn(msg.sender, amount);
        // Emit withdrawal event
        emit Withdrawal(msg.sender, amount);
        // Send Native to sender (last statement, to prevent reentrancy)
        msg.sender.transfer(amount);
    }
}
          

./contracts/genesis/interface/IFtsoRegistryGenesis.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

import "./IFtsoGenesis.sol";


interface IFtsoRegistryGenesis {

    function getFtsos(uint256[] memory _indices) external view returns(IFtsoGenesis[] memory _ftsos);
}
          

@openzeppelin/contracts/math/Math.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}
          

./contracts/token/lib/VotePower.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "./CheckPointHistory.sol";
import "./CheckPointsByAddress.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";


/**
 * @title Vote power library
 * @notice A library to record delegate vote power balances by delegator 
 *  and delegatee.
 **/
library VotePower {
    using CheckPointHistory for CheckPointHistory.CheckPointHistoryState;
    using CheckPointsByAddress for CheckPointsByAddress.CheckPointsByAddressState;
    using SafeMath for uint256;

    /**
     * @dev `VotePowerState` is state structure used by this library to manage vote
     *  power amounts by delegator and it's delegates.
     */
    struct VotePowerState {
        // `votePowerByAddress` is the map that tracks the voting power balance
        //  of each address, by block.
        CheckPointsByAddress.CheckPointsByAddressState votePowerByAddress;
    }

    /**
     * @notice This modifier checks that both addresses are non-zero.
     * @param _delegator A delegator address.
     * @param _delegatee A delegatee address.
     */
    modifier addressesNotZero(address _delegator, address _delegatee) {
        // Both addresses cannot be zero
        assert(!(_delegator == address(0) && _delegatee == address(0)));
        _;
    }


    /**
     * @notice Delegate vote power `_amount` to `_delegatee` address from `_delegator` address.
     * @param _delegator Delegator address 
     * @param _delegatee Delegatee address
     * @param _amount The _amount of vote power to send from _delegator to _delegatee
     * @dev Amount recorded at the current block.
     **/
    function delegate(
        VotePowerState storage _self, 
        address _delegator, 
        address _delegatee,
        uint256 _amount
    )
        internal 
        addressesNotZero(_delegator, _delegatee)
    {
        // Shortcut
        if (_amount == 0) {
            return;
        }

        // Transmit vote power
        _self.votePowerByAddress.transmit(_delegator, _delegatee, _amount);
    }

    /**
     * @notice Change the current vote power value.
     * @param _owner Address of vote power owner.
     * @param _add The amount to add to the vote power.
     * @param _sub The amount to subtract from the vote power.
     */
    function changeValue(
        VotePowerState storage _self, 
        address _owner,
        uint256 _add,
        uint256 _sub
    )
        internal
    {
        assert(_owner != address(0));
        if (_add == _sub) return;
        uint256 value = _self.votePowerByAddress.valueOfAtNow(_owner);
        value = value.add(_add).sub(_sub);
        _self.votePowerByAddress.writeValue(_owner, value);
    }
    
    /**
     * @notice Undelegate vote power `_amount` from `_delegatee` address 
     *  to `_delegator` address
     * @param _delegator Delegator address 
     * @param _delegatee Delegatee address
     * @param _amount The amount of vote power recovered by delegator from delegatee
     **/
    function undelegate(
        VotePowerState storage _self, 
        address _delegator, 
        address _delegatee,
        uint256 _amount
    )
        internal
        addressesNotZero(_delegator, _delegatee)
    {
        // Shortcut
        if (_amount == 0) {
            return;
        }

        // Recover vote power
        _self.votePowerByAddress.transmit(_delegatee, _delegator, _amount);
    }

    /**
     * Delete at most `_count` of the oldest checkpoints.
     * At least one checkpoint at or before `_cleanupBlockNumber` will remain 
     * (unless the history was empty to start with).
     */    
    function cleanupOldCheckpoints(
        VotePowerState storage _self, 
        address _owner, 
        uint256 _count,
        uint256 _cleanupBlockNumber
    )
        internal
        returns (uint256)
    {
        return _self.votePowerByAddress.cleanupOldCheckpoints(_owner, _count, _cleanupBlockNumber);
    }

    /**
     * @notice Get the vote power of `_who` at `_blockNumber`.
     * @param _self A VotePowerState instance to manage.
     * @param _who Address to get vote power.
     * @param _blockNumber Block number of the block to fetch vote power.
     * @return _votePower The fetched vote power.
     */
    function votePowerOfAt(
        VotePowerState storage _self, 
        address _who, 
        uint256 _blockNumber
    )
        internal view 
        returns(uint256 _votePower)
    {
        return _self.votePowerByAddress.valueOfAt(_who, _blockNumber);
    }

    /**
     * @notice Get the current vote power of `_who`.
     * @param _self A VotePowerState instance to manage.
     * @param _who Address to get vote power.
     * @return _votePower The fetched vote power.
     */
    function votePowerOfAtNow(
        VotePowerState storage _self, 
        address _who
    )
        internal view
        returns(uint256 _votePower)
    {
        return _self.votePowerByAddress.valueOfAtNow(_who);
    }
}
          

@openzeppelin/contracts/math/SafeMath.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
          

./contracts/addressUpdater/implementation/AddressUpdatable.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "../interface/IIAddressUpdatable.sol";


abstract contract AddressUpdatable is IIAddressUpdatable {

    // https://docs.soliditylang.org/en/v0.8.7/contracts.html#constant-and-immutable-state-variables
    // No storage slot is allocated
    bytes32 internal constant ADDRESS_STORAGE_POSITION = 
        keccak256("flare.diamond.AddressUpdatable.ADDRESS_STORAGE_POSITION");

    modifier onlyAddressUpdater() {
        require (msg.sender == getAddressUpdater(), "only address updater");
        _;
    }

    constructor(address _addressUpdater) {
        setAddressUpdaterValue(_addressUpdater);
    }

    function getAddressUpdater() public view returns (address _addressUpdater) {
        // Only direct constants are allowed in inline assembly, so we assign it here
        bytes32 position = ADDRESS_STORAGE_POSITION;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            _addressUpdater := sload(position)
        }
    }

    /**
     * @notice external method called from AddressUpdater only
     */
    function updateContractAddresses(
        bytes32[] memory _contractNameHashes,
        address[] memory _contractAddresses
    )
        external override
        onlyAddressUpdater
    {
        // update addressUpdater address
        setAddressUpdaterValue(_getContractAddress(_contractNameHashes, _contractAddresses, "AddressUpdater"));
        // update all other addresses
        _updateContractAddresses(_contractNameHashes, _contractAddresses);
    }

    /**
     * @notice virtual method that a contract extending AddressUpdatable must implement
     */
    function _updateContractAddresses(
        bytes32[] memory _contractNameHashes,
        address[] memory _contractAddresses
    ) internal virtual;

    /**
     * @notice helper method to get contract address
     * @dev it reverts if contract name does not exist
     */
    function _getContractAddress(
        bytes32[] memory _nameHashes,
        address[] memory _addresses,
        string memory _nameToFind
    )
        internal pure
        returns(address)
    {
        bytes32 nameHash = keccak256(abi.encode(_nameToFind));
        address a = address(0);
        for (uint256 i = 0; i < _nameHashes.length; i++) {
            if (nameHash == _nameHashes[i]) {
                a = _addresses[i];
                break;
            }
        }
        require(a != address(0), "address zero");
        return a;
    }

    function setAddressUpdaterValue(address _addressUpdater) internal {
        // Only direct constants are allowed in inline assembly, so we assign it here
        bytes32 position = ADDRESS_STORAGE_POSITION;
        // solhint-disable-next-line no-inline-assembly  
        assembly {
            sstore(position, _addressUpdater)
        }
    }
}
          

./contracts/token/lib/DelegationHistory.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "@openzeppelin/contracts/math/Math.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/SafeCast.sol";
import "../../utils/implementation/SafePct.sol";

/**
 * @title DelegationHistory library
 * @notice A contract to manage checkpoints as of a given block.
 * @dev Store value history by block number with detachable state.
 **/
library DelegationHistory {
    using SafeMath for uint256;
    using SafePct for uint256;
    using SafeCast for uint256;

    uint256 public constant MAX_DELEGATES_BY_PERCENT = 2;
    string private constant MAX_DELEGATES_MSG = "Max delegates exceeded";
    
    struct Delegation {
        address delegate;
        uint16 value;
        
        // delegations[0] will also hold length and blockNumber to save 1 slot of storage per checkpoint
        // for all other indexes these fields will be 0
        // also, when checkpoint is empty, `length` will automatically be 0, which is ok
        uint64 fromBlock;
        uint8 length;       // length is limited to MAX_DELEGATES_BY_PERCENT which fits in 8 bits
    }
    
    /**
     * @dev `CheckPoint` is the structure that attaches a block number to a
     *  given value; the block number attached is the one that last changed the
     *  value
     **/
    struct CheckPoint {
        // the list of delegations at the time
        mapping(uint256 => Delegation) delegations;
    }

    struct CheckPointHistoryState {
        // `checkpoints` is an array that tracks delegations at non-contiguous block numbers
        mapping(uint256 => CheckPoint) checkpoints;
        // `checkpoints` before `startIndex` have been deleted
        // INVARIANT: checkpoints.length == 0 || startIndex < checkpoints.length      (strict!)
        uint64 startIndex;
        uint64 length;
    }

    /**
     * @notice Queries the value at a specific `_blockNumber`
     * @param _self A CheckPointHistoryState instance to manage.
     * @param _delegate The delegate for which we need value.
     * @param _blockNumber The block number of the value active at that time
     * @return _value The value of the `_delegate` at `_blockNumber`     
     **/
    function valueOfAt(
        CheckPointHistoryState storage _self, 
        address _delegate, 
        uint256 _blockNumber
    )
        internal view 
        returns (uint256 _value)
    {
        (bool found, uint256 index) = _findGreatestBlockLessThan(_self, _blockNumber);
        if (!found) return 0;
        return _getValueForDelegate(_self.checkpoints[index], _delegate);
    }

    /**
     * @notice Queries the value at `block.number`
     * @param _self A CheckPointHistoryState instance to manage.
     * @param _delegate The delegate for which we need value.
     * @return _value The value at `block.number`
     **/
    function valueOfAtNow(
        CheckPointHistoryState storage _self, 
        address _delegate
    )
        internal view
        returns (uint256 _value)
    {
        uint256 length = _self.length;
        if (length == 0) return 0;
        return _getValueForDelegate(_self.checkpoints[length - 1], _delegate);
    }

    /**
     * @notice Writes the value at the current block.
     * @param _self A CheckPointHistoryState instance to manage.
     * @param _delegate The delegate tu update.
     * @param _value The new value to set for this delegate (value `0` deletes `_delegate` from the list).
     **/
    function writeValue(
        CheckPointHistoryState storage _self, 
        address _delegate, 
        uint256 _value
    )
        internal
    {
        uint256 historyCount = _self.length;
        if (historyCount == 0) {
            // checkpoints array empty, push new CheckPoint
            if (_value != 0) {
                CheckPoint storage cp = _self.checkpoints[historyCount];
                _self.length = SafeCast.toUint64(historyCount + 1);
                cp.delegations[0] = Delegation({ 
                    delegate: _delegate,
                    value: _value.toUint16(),
                    fromBlock:  block.number.toUint64(),
                    length: 1 
                });
            }
        } else {
            // historyCount - 1 is safe, since historyCount != 0
            CheckPoint storage lastCheckpoint = _self.checkpoints[historyCount - 1];
            uint256 lastBlock = lastCheckpoint.delegations[0].fromBlock;
            // slither-disable-next-line incorrect-equality
            if (block.number == lastBlock) {
                // If last check point is the current block, just update
                _updateDelegates(lastCheckpoint, _delegate, _value);
            } else {
                // we should never have future blocks in history
                assert(block.number > lastBlock); 
                // last check point block is before
                CheckPoint storage cp = _self.checkpoints[historyCount];
                _self.length = SafeCast.toUint64(historyCount + 1);
                _copyAndUpdateDelegates(cp, lastCheckpoint, _delegate, _value);
                cp.delegations[0].fromBlock = block.number.toUint64();
            }
        }
    }
    
    /**
     * Get all percentage delegations active at a time.
     * @param _self A CheckPointHistoryState instance to manage.
     * @param _blockNumber The block number to query. 
     * @return _delegates The active percentage delegates at the time. 
     * @return _values The delegates' values at the time. 
     **/
    function delegationsAt(
        CheckPointHistoryState storage _self,
        uint256 _blockNumber
    )
        internal view
        returns (
            address[] memory _delegates,
            uint256[] memory _values
        )
    {
        (bool found, uint256 index) = _findGreatestBlockLessThan(_self, _blockNumber);
        if (!found) {
            return (new address[](0), new uint256[](0));
        }

        // copy delegates and values to memory arrays
        // (to prevent caller updating the stored value)
        CheckPoint storage cp = _self.checkpoints[index];
        uint256 length = cp.delegations[0].length;
        _delegates = new address[](length);
        _values = new uint256[](length);
        for (uint256 i = 0; i < length; i++) {
            Delegation storage dlg = cp.delegations[i];
            _delegates[i] = dlg.delegate;
            _values[i] = dlg.value;
        }
    }
    
    /**
     * Get all percentage delegations active now.
     * @param _self A CheckPointHistoryState instance to manage.
     * @return _delegates The active percentage delegates. 
     * @return _values The delegates' values. 
     **/
    function delegationsAtNow(
        CheckPointHistoryState storage _self
    )
        internal view
        returns (address[] memory _delegates, uint256[] memory _values)
    {
        return delegationsAt(_self, block.number);
    }
    
    /**
     * Get all percentage delegations active now.
     * @param _self A CheckPointHistoryState instance to manage.
     * @return _length The number of delegations. 
     * @return _delegations . 
     **/
    function delegationsAtNowRaw(
        CheckPointHistoryState storage _self
    )
        internal view
        returns (
            uint256 _length, 
            mapping(uint256 => Delegation) storage _delegations
        )
    {
        uint256 length = _self.length;
        if (length == 0) {
            return (0, _self.checkpoints[0].delegations);
        }
        CheckPoint storage cp = _self.checkpoints[length - 1];
        return (cp.delegations[0].length, cp.delegations);
    }
    
    /**
     * Get the number of delegations.
     * @param _self A CheckPointHistoryState instance to query.
     * @param _blockNumber The block number to query. 
     * @return _count Count of delegations at the time.
     **/
    function countAt(
        CheckPointHistoryState storage _self,
        uint256 _blockNumber
    )
        internal view
        returns (uint256 _count)
    {
        (bool found, uint256 index) = _findGreatestBlockLessThan(_self, _blockNumber);
        if (!found) return 0;
        return _self.checkpoints[index].delegations[0].length;
    }
    
    /**
     * Get the sum of all delegation values.
     * @param _self A CheckPointHistoryState instance to query.
     * @param _blockNumber The block number to query. 
     * @return _total Total delegation value at the time.
     **/
    function totalValueAt(
        CheckPointHistoryState storage _self, 
        uint256 _blockNumber
    )
        internal view
        returns (uint256 _total)
    {
        (bool found, uint256 index) = _findGreatestBlockLessThan(_self, _blockNumber);
        if (!found) return 0;
        
        CheckPoint storage cp = _self.checkpoints[index];
        uint256 length = cp.delegations[0].length;
        _total = 0;
        for (uint256 i = 0; i < length; i++) {
            _total = _total.add(cp.delegations[i].value);
        }
    }

    /**
     * Get the sum of all delegation values.
     * @param _self A CheckPointHistoryState instance to query.
     * @return _total Total delegation value at the time.
     **/
    function totalValueAtNow(
        CheckPointHistoryState storage _self
    )
        internal view
        returns (uint256 _total)
    {
        return totalValueAt(_self, block.number);
    }

    /**
     * Get the sum of all delegation values, every one scaled by `_mul/_div`.
     * @param _self A CheckPointHistoryState instance to query.
     * @param _mul The multiplier.
     * @param _div The divisor.
     * @param _blockNumber The block number to query. 
     * @return _total Total scaled delegation value at the time.
     **/
    function scaledTotalValueAt(
        CheckPointHistoryState storage _self, 
        uint256 _mul,
        uint256 _div,
        uint256 _blockNumber
    )
        internal view
        returns (uint256 _total)
    {
        (bool found, uint256 index) = _findGreatestBlockLessThan(_self, _blockNumber);
        if (!found) return 0;
        
        CheckPoint storage cp = _self.checkpoints[index];
        uint256 length = cp.delegations[0].length;
        _total = 0;
        for (uint256 i = 0; i < length; i++) {
            _total = _total.add(uint256(cp.delegations[i].value).mulDiv(_mul, _div));
        }
    }

    /**
     * Clear all delegations at this moment.
     * @param _self A CheckPointHistoryState instance to manage.
     */    
    function clear(CheckPointHistoryState storage _self) internal {
        uint256 historyCount = _self.length;
        if (historyCount > 0) {
            // add an empty checkpoint
            CheckPoint storage cp = _self.checkpoints[historyCount];
            _self.length = SafeCast.toUint64(historyCount + 1);
            // create empty checkpoint = only set fromBlock
            cp.delegations[0] = Delegation({ 
                delegate: address(0),
                value: 0,
                fromBlock: block.number.toUint64(),
                length: 0
            });
        }
    }

    /**
     * Delete at most `_count` of the oldest checkpoints.
     * At least one checkpoint at or before `_cleanupBlockNumber` will remain 
     * (unless the history was empty to start with).
     */    
    function cleanupOldCheckpoints(
        CheckPointHistoryState storage _self, 
        uint256 _count,
        uint256 _cleanupBlockNumber
    )
        internal
        returns (uint256)
    {
        if (_cleanupBlockNumber == 0) return 0;   // optimization for when cleaning is not enabled
        uint256 length = _self.length;
        if (length == 0) return 0;
        uint256 startIndex = _self.startIndex;
        // length - 1 is safe, since length != 0 (check above)
        uint256 endIndex = Math.min(startIndex.add(_count), length - 1);    // last element can never be deleted
        uint256 index = startIndex;
        // we can delete `checkpoint[index]` while the next checkpoint is at `_cleanupBlockNumber` or before
        while (index < endIndex && _self.checkpoints[index + 1].delegations[0].fromBlock <= _cleanupBlockNumber) {
            CheckPoint storage cp = _self.checkpoints[index];
            uint256 cplength = cp.delegations[0].length;
            for (uint256 i = 0; i < cplength; i++) {
                delete cp.delegations[i];
            }
            index++;
        }
        if (index > startIndex) {   // index is the first not deleted index
            _self.startIndex = SafeCast.toUint64(index);
        }
        return index - startIndex;  // safe: index = startIndex at start and increases in loop
    }

    /////////////////////////////////////////////////////////////////////////////////
    // helper functions for writeValueAt
    
    function _copyAndUpdateDelegates(
        CheckPoint storage _cp, 
        CheckPoint storage _orig, 
        address _delegate, 
        uint256 _value
    )
        private
    {
        uint256 length = _orig.delegations[0].length;
        bool updated = false;
        uint256 newlength = 0;
        for (uint256 i = 0; i < length; i++) {
            Delegation memory origDlg = _orig.delegations[i];
            if (origDlg.delegate == _delegate) {
                // copy delegate, but with new value
                newlength = _appendDelegate(_cp, origDlg.delegate, _value, newlength);
                updated = true;
            } else {
                // just copy the delegate with original value
                newlength = _appendDelegate(_cp, origDlg.delegate, origDlg.value, newlength);
            }
        }
        if (!updated) {
            // delegate is not in the original list, so add it
            newlength = _appendDelegate(_cp, _delegate, _value, newlength);
        }
        // safe - newlength <= length + 1 <= MAX_DELEGATES_BY_PERCENT
        _cp.delegations[0].length = uint8(newlength);
    }

    function _updateDelegates(CheckPoint storage _cp, address _delegate, uint256 _value) private {
        uint256 length = _cp.delegations[0].length;
        uint256 i = 0;
        while (i < length && _cp.delegations[i].delegate != _delegate) ++i;
        if (i < length) {
            if (_value != 0) {
                _cp.delegations[i].value = _value.toUint16();
            } else {
                _deleteDelegate(_cp, i, length - 1);  // length - 1 is safe:  0 <= i < length
                _cp.delegations[0].length = uint8(length - 1);
            }
        } else {
            uint256 newlength = _appendDelegate(_cp, _delegate, _value, length);
            _cp.delegations[0].length = uint8(newlength);  // safe - length <= MAX_DELEGATES_BY_PERCENT
        }
    }
    
    function _appendDelegate(CheckPoint storage _cp, address _delegate, uint256 _value, uint256 _length) 
        private 
        returns (uint256)
    {
        if (_value != 0) {
            require(_length < MAX_DELEGATES_BY_PERCENT, MAX_DELEGATES_MSG);
            Delegation storage dlg = _cp.delegations[_length];
            dlg.delegate = _delegate;
            dlg.value = _value.toUint16();
            // for delegations[0], fromBlock and length are assigned outside
            return _length + 1;
        }
        return _length;
    }
    
    function _deleteDelegate(CheckPoint storage _cp, uint256 _index, uint256 _last) private {
        Delegation storage dlg = _cp.delegations[_index];
        Delegation storage lastDlg = _cp.delegations[_last];
        if (_index < _last) {
            dlg.delegate = lastDlg.delegate;
            dlg.value = lastDlg.value;
        }
        lastDlg.delegate = address(0);
        lastDlg.value = 0;
    }
    
    /////////////////////////////////////////////////////////////////////////////////
    // helper functions for querying
    
    /**
     * @notice Binary search of _checkpoints array.
     * @param _checkpoints An array of CheckPoint to search.
     * @param _startIndex Smallest possible index to be returned.
     * @param _blockNumber The block number to search for.
     */
    function _binarySearchGreatestBlockLessThan(
        mapping(uint256 => CheckPoint) storage _checkpoints, 
        uint256 _startIndex,
        uint256 _endIndex,
        uint256 _blockNumber
    )
        private view
        returns (uint256 _index)
    {
        // Binary search of the value by given block number in the array
        uint256 min = _startIndex;
        uint256 max = _endIndex.sub(1);
        while (max > min) {
            uint256 mid = (max.add(min).add(1)).div(2);
            if (_checkpoints[mid].delegations[0].fromBlock <= _blockNumber) {
                min = mid;
            } else {
                max = mid.sub(1);
            }
        }
        return min;
    }

    /**
     * @notice Binary search of _checkpoints array. Extra optimized for the common case when we are 
     *   searching for the last block.
     * @param _self The state to query.
     * @param _blockNumber The block number to search for.
     * @return _found true if value was found (only `false` if `_blockNumber` is before first 
     *   checkpoint or the checkpoint array is empty)
     * @return _index index of the newest block with number less than or equal `_blockNumber`
     */
    function _findGreatestBlockLessThan(
        CheckPointHistoryState storage _self, 
        uint256 _blockNumber
    )
        private view
        returns (
            bool _found,
            uint256 _index
        )
    {
        uint256 startIndex = _self.startIndex;
        uint256 historyCount = _self.length;
        if (historyCount == 0) {
            _found = false;
        } else if (_blockNumber >= _self.checkpoints[historyCount - 1].delegations[0].fromBlock) {
            _found = true;
            _index = historyCount - 1;  // safe, historyCount != 0 in this branch
        } else if (_blockNumber < _self.checkpoints[startIndex].delegations[0].fromBlock) {
            // reading data before `_startIndex` is only safe before first cleanup
            require(startIndex == 0, "DelegationHistory: reading from cleaned-up block");
            _found = false;
        } else {
            _found = true;
            _index = _binarySearchGreatestBlockLessThan(_self.checkpoints, startIndex, historyCount, _blockNumber);
        }
    }
    
    /**
     * Find delegate and return its value or 0 if not found.
     */
    function _getValueForDelegate(CheckPoint storage _cp, address _delegate) internal view returns (uint256) {
        uint256 length = _cp.delegations[0].length;
        for (uint256 i = 0; i < length; i++) {
            Delegation storage dlg = _cp.delegations[i];
            if (dlg.delegate == _delegate) {
                return dlg.value;
            }
        }
        return 0;   // _delegate not found
    }
}
          

./contracts/token/lib/CheckPointsByAddress.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "./CheckPointHistory.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";


/**
 * @title Check Points By Address library
 * @notice A contract to manage checkpoint history for a collection of addresses.
 * @dev Store value history by address, and then by block number.
 **/
library CheckPointsByAddress {
    using SafeMath for uint256;
    using CheckPointHistory for CheckPointHistory.CheckPointHistoryState;

    struct CheckPointsByAddressState {
        // `historyByAddress` is the map that stores the check point history of each address
        mapping(address => CheckPointHistory.CheckPointHistoryState) historyByAddress;
    }

    /**
    /**
     * @notice Send `amount` value to `to` address from `from` address.
     * @param _self A CheckPointsByAddressState instance to manage.
     * @param _from Address of the history of from values 
     * @param _to Address of the history of to values 
     * @param _amount The amount of value to be transferred
     **/
    function transmit(
        CheckPointsByAddressState storage _self, 
        address _from, 
        address _to, 
        uint256 _amount
    )
        internal
    {
        // Shortcut
        if (_amount == 0) return;

        // Both from and to can never be zero
        assert(!(_from == address(0) && _to == address(0)));

        // Update transferer value
        if (_from != address(0)) {
            // Compute the new from balance
            uint256 newValueFrom = valueOfAtNow(_self, _from).sub(_amount);
            writeValue(_self, _from, newValueFrom);
        }

        // Update transferee value
        if (_to != address(0)) {
            // Compute the new to balance
            uint256 newValueTo = valueOfAtNow(_self, _to).add(_amount);
            writeValue(_self, _to, newValueTo);
        }
    }

    /**
     * @notice Queries the value of `_owner` at a specific `_blockNumber`.
     * @param _self A CheckPointsByAddressState instance to manage.
     * @param _owner The address from which the value will be retrieved.
     * @param _blockNumber The block number to query for the then current value.
     * @return The value at `_blockNumber` for `_owner`.
     **/
    function valueOfAt(
        CheckPointsByAddressState storage _self, 
        address _owner, 
        uint256 _blockNumber
    )
        internal view
        returns (uint256)
    {
        // Get history for _owner
        CheckPointHistory.CheckPointHistoryState storage history = _self.historyByAddress[_owner];
        // Return value at given block
        return history.valueAt(_blockNumber);
    }

    /**
     * @notice Get the value of the `_owner` at the current `block.number`.
     * @param _self A CheckPointsByAddressState instance to manage.
     * @param _owner The address of the value is being requested.
     * @return The value of `_owner` at the current block.
     **/
    function valueOfAtNow(CheckPointsByAddressState storage _self, address _owner) internal view returns (uint256) {
        // Get history for _owner
        CheckPointHistory.CheckPointHistoryState storage history = _self.historyByAddress[_owner];
        // Return value at now
        return history.valueAtNow();
    }

    /**
     * @notice Writes the `value` at the current block number for `_owner`.
     * @param _self A CheckPointsByAddressState instance to manage.
     * @param _owner The address of `_owner` to write.
     * @param _value The value to write.
     * @dev Sender must be the owner of the contract.
     **/
    function writeValue(
        CheckPointsByAddressState storage _self, 
        address _owner, 
        uint256 _value
    )
        internal
    {
        // Get history for _owner
        CheckPointHistory.CheckPointHistoryState storage history = _self.historyByAddress[_owner];
        // Write the value
        history.writeValue(_value);
    }
    
    /**
     * Delete at most `_count` of the oldest checkpoints.
     * At least one checkpoint at or before `_cleanupBlockNumber` will remain 
     * (unless the history was empty to start with).
     */    
    function cleanupOldCheckpoints(
        CheckPointsByAddressState storage _self, 
        address _owner, 
        uint256 _count,
        uint256 _cleanupBlockNumber
    )
        internal
        returns (uint256)
    {
        if (_owner != address(0)) {
            return _self.historyByAddress[_owner].cleanupOldCheckpoints(_count, _cleanupBlockNumber);
        }
        return 0;
    }
}
          

./contracts/token/lib/VotePowerCache.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "../lib/VotePower.sol";


/**
 * @title Vote power library
 * @notice A library to record delegate vote power balances by delegator 
 *  and delegatee.
 **/
library VotePowerCache {
    using SafeMath for uint256;
    using VotePower for VotePower.VotePowerState;

    struct RevocationCacheRecord {
        // revoking delegation only affects cached value therefore we have to track
        // the revocation in order not to revoke twice
        // mapping delegatee => revokedValue
        mapping(address => uint256) revocations;
    }
    
    /**
     * @dev `CacheState` is state structure used by this library to manage vote
     *  power amounts by delegator and it's delegates.
     */
    struct CacheState {
        // map keccak256([address, _blockNumber]) -> (value + 1)
        mapping(bytes32 => uint256) valueCache;
        
        // map keccak256([address, _blockNumber]) -> RevocationCacheRecord
        mapping(bytes32 => RevocationCacheRecord) revocationCache;
    }

    /**
    * @notice Get the cached value at given block. If there is no cached value, original
    *    value is returned and stored to cache. Cache never gets stale, because original
    *    value can never change in a past block.
    * @param _self A VotePowerCache instance to manage.
    * @param _votePower A VotePower instance to read from if cache is empty.
    * @param _who Address to get vote power.
    * @param _blockNumber Block number of the block to fetch vote power.
    * precondition: _blockNumber < block.number
    */
    function valueOfAt(
        CacheState storage _self,
        VotePower.VotePowerState storage _votePower,
        address _who,
        uint256 _blockNumber
    )
        internal 
        returns (uint256 _value, bool _createdCache)
    {
        bytes32 key = keccak256(abi.encode(_who, _blockNumber));
        // is it in cache?
        uint256 cachedValue = _self.valueCache[key];
        if (cachedValue != 0) {
            return (cachedValue - 1, false);    // safe, cachedValue != 0
        }
        // read from _votePower
        uint256 votePowerValue = _votePower.votePowerOfAt(_who, _blockNumber);
        _writeCacheValue(_self, key, votePowerValue);
        return (votePowerValue, true);
    }

    /**
    * @notice Get the cached value at given block. If there is no cached value, original
    *    value is returned. Cache is never modified.
    * @param _self A VotePowerCache instance to manage.
    * @param _votePower A VotePower instance to read from if cache is empty.
    * @param _who Address to get vote power.
    * @param _blockNumber Block number of the block to fetch vote power.
    * precondition: _blockNumber < block.number
    */
    function valueOfAtReadonly(
        CacheState storage _self,
        VotePower.VotePowerState storage _votePower,
        address _who,
        uint256 _blockNumber
    )
        internal view 
        returns (uint256 _value)
    {
        bytes32 key = keccak256(abi.encode(_who, _blockNumber));
        // is it in cache?
        uint256 cachedValue = _self.valueCache[key];
        if (cachedValue != 0) {
            return cachedValue - 1;     // safe, cachedValue != 0
        }
        // read from _votePower
        return _votePower.votePowerOfAt(_who, _blockNumber);
    }
    
    /**
    * @notice Delete cached value for `_who` at given block.
    *   Only used for history cleanup.
    * @param _self A VotePowerCache instance to manage.
    * @param _who Address to get vote power.
    * @param _blockNumber Block number of the block to fetch vote power.
    * @return _deleted The number of cache items deleted (always 0 or 1).
    * precondition: _blockNumber < cleanupBlockNumber
    */
    function deleteValueAt(
        CacheState storage _self,
        address _who,
        uint256 _blockNumber
    )
        internal
        returns (uint256 _deleted)
    {
        bytes32 key = keccak256(abi.encode(_who, _blockNumber));
        if (_self.valueCache[key] != 0) {
            delete _self.valueCache[key];
            return 1;
        }
        return 0;
    }
    
    /**
    * @notice Revoke vote power delegation from `from` to `to` at given block.
    *   Updates cached values for the block, so they are the only vote power values respecting revocation.
    * @dev Only delegatees cached value is changed, delegator doesn't get the vote power back; so
    *   the revoked vote power is forfeit for as long as this vote power block is in use. This is needed to
    *   prevent double voting.
    * @param _self A VotePowerCache instance to manage.
    * @param _votePower A VotePower instance to read from if cache is empty.
    * @param _from The delegator.
    * @param _to The delegatee.
    * @param _revokedValue Value of delegation is not stored here, so it must be supplied by caller.
    * @param _blockNumber Block number of the block to modify.
    * precondition: _blockNumber < block.number
    */
    function revokeAt(
        CacheState storage _self,
        VotePower.VotePowerState storage _votePower,
        address _from,
        address _to,
        uint256 _revokedValue,
        uint256 _blockNumber
    )
        internal
    {
        if (_revokedValue == 0) return;
        bytes32 keyFrom = keccak256(abi.encode(_from, _blockNumber));
        if (_self.revocationCache[keyFrom].revocations[_to] != 0) {
            revert("Already revoked");
        }
        // read values and prime cacheOf
        (uint256 valueTo,) = valueOfAt(_self, _votePower, _to, _blockNumber);
        // write new values
        bytes32 keyTo = keccak256(abi.encode(_to, _blockNumber));
        _writeCacheValue(_self, keyTo, valueTo.sub(_revokedValue, "Revoked value too large"));
        // mark as revoked
        _self.revocationCache[keyFrom].revocations[_to] = _revokedValue;
    }
    
    /**
    * @notice Delete revocation from `_from` to `_to` at block `_blockNumber`.
    *   Only used for history cleanup.
    * @param _self A VotePowerCache instance to manage.
    * @param _from The delegator.
    * @param _to The delegatee.
    * @param _blockNumber Block number of the block to modify.
    * precondition: _blockNumber < cleanupBlockNumber
    */
    function deleteRevocationAt(
        CacheState storage _self,
        address _from,
        address _to,
        uint256 _blockNumber
    )
        internal
        returns (uint256 _deleted)
    {
        bytes32 keyFrom = keccak256(abi.encode(_from, _blockNumber));
        RevocationCacheRecord storage revocationRec = _self.revocationCache[keyFrom];
        uint256 value = revocationRec.revocations[_to];
        if (value != 0) {
            delete revocationRec.revocations[_to];
            return 1;
        }
        return 0;
    }

    /**
    * @notice Returns true if `from` has revoked vote pover delgation of `to` in block `_blockNumber`.
    * @param _self A VotePowerCache instance to manage.
    * @param _from The delegator.
    * @param _to The delegatee.
    * @param _blockNumber Block number of the block to fetch result.
    * precondition: _blockNumber < block.number
    */
    function revokedFromToAt(
        CacheState storage _self,
        address _from,
        address _to,
        uint256 _blockNumber
    )
        internal view
        returns (bool revoked)
    {
        bytes32 keyFrom = keccak256(abi.encode(_from, _blockNumber));
        return _self.revocationCache[keyFrom].revocations[_to] != 0;
    }
    
    function _writeCacheValue(CacheState storage _self, bytes32 _key, uint256 _value) private {
        // store to cacheOf (add 1 to differentiate from empty)
        _self.valueCache[_key] = _value.add(1);
    }
}
          

./contracts/token/interface/IIVPContract.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

import "../../userInterfaces/IVPToken.sol";
import "../../userInterfaces/IVPContractEvents.sol";
import "./IICleanable.sol";

interface IIVPContract is IICleanable, IVPContractEvents {
    /**
     * Update vote powers when tokens are transfered.
     * Also update delegated vote powers for percentage delegation
     * and check for enough funds for explicit delegations.
     **/
    function updateAtTokenTransfer(
        address _from, 
        address _to, 
        uint256 _fromBalance,
        uint256 _toBalance,
        uint256 _amount
    ) external;

    /**
     * @notice Delegate `_bips` percentage of voting power to `_to` from `_from`
     * @param _from The address of the delegator
     * @param _to The address of the recipient
     * @param _balance The delegator's current balance
     * @param _bips The percentage of voting power to be delegated expressed in basis points (1/100 of one percent).
     *   Not cummulative - every call resets the delegation value (and value of 0 revokes delegation).
     **/
    function delegate(
        address _from, 
        address _to, 
        uint256 _balance, 
        uint256 _bips
    ) external;
    
    /**
     * @notice Explicitly delegate `_amount` of voting power to `_to` from `msg.sender`.
     * @param _from The address of the delegator
     * @param _to The address of the recipient
     * @param _balance The delegator's current balance
     * @param _amount An explicit vote power amount to be delegated.
     *   Not cummulative - every call resets the delegation value (and value of 0 undelegates `to`).
     **/    
    function delegateExplicit(
        address _from, 
        address _to, 
        uint256 _balance, 
        uint _amount
    ) external;    

    /**
     * @notice Revoke all delegation from sender to `_who` at given block. 
     *    Only affects the reads via `votePowerOfAtCached()` in the block `_blockNumber`.
     *    Block `_blockNumber` must be in the past. 
     *    This method should be used only to prevent rogue delegate voting in the current voting block.
     *    To stop delegating use delegate/delegateExplicit with value of 0 or undelegateAll/undelegateAllExplicit.
     * @param _from The address of the delegator
     * @param _who Address of the delegatee
     * @param _balance The delegator's current balance
     * @param _blockNumber The block number at which to revoke delegation.
     **/
    function revokeDelegationAt(
        address _from, 
        address _who, 
        uint256 _balance,
        uint _blockNumber
    ) external;
    
        /**
     * @notice Undelegate all voting power for delegates of `msg.sender`
     *    Can only be used with percentage delegation.
     *    Does not reset delegation mode back to NOTSET.
     * @param _from The address of the delegator
     **/
    function undelegateAll(
        address _from,
        uint256 _balance
    ) external;
    
    /**
     * @notice Undelegate all explicit vote power by amount delegates for `msg.sender`.
     *    Can only be used with explicit delegation.
     *    Does not reset delegation mode back to NOTSET.
     * @param _from The address of the delegator
     * @param _delegateAddresses Explicit delegation does not store delegatees' addresses, 
     *   so the caller must supply them.
     * @return The amount still delegated (in case the list of delegates was incomplete).
     */
    function undelegateAllExplicit(
        address _from, 
        address[] memory _delegateAddresses
    ) external returns (uint256);
    
    /**
    * @notice Get the vote power of `_who` at block `_blockNumber`
    *   Reads/updates cache and upholds revocations.
    * @param _who The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_who` at `_blockNumber`.
    */
    function votePowerOfAtCached(address _who, uint256 _blockNumber) external returns(uint256);
    
    /**
     * @notice Get the current vote power of `_who`.
     * @param _who The address to get voting power.
     * @return Current vote power of `_who`.
     */
    function votePowerOf(address _who) external view returns(uint256);
    
    /**
    * @notice Get the vote power of `_who` at block `_blockNumber`
    * @param _who The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_who` at `_blockNumber`.
    */
    function votePowerOfAt(address _who, uint256 _blockNumber) external view returns(uint256);

    /**
    * @notice Get the vote power of `_who` at block `_blockNumber`, ignoring revocation information (and cache).
    * @param _who The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return Vote power of `_who` at `_blockNumber`. Result doesn't change if vote power is revoked.
    */
    function votePowerOfAtIgnoringRevocation(address _who, uint256 _blockNumber) external view returns(uint256);

    /**
     * Return vote powers for several addresses in a batch.
     * @param _owners The list of addresses to fetch vote power of.
     * @param _blockNumber The block number at which to fetch.
     * @return A list of vote powers.
     */    
    function batchVotePowerOfAt(
        address[] memory _owners, 
        uint256 _blockNumber
    )
        external view returns(uint256[] memory);

    /**
    * @notice Get current delegated vote power `_from` delegator delegated `_to` delegatee.
    * @param _from Address of delegator
    * @param _to Address of delegatee
    * @param _balance The delegator's current balance
    * @return The delegated vote power.
    */
    function votePowerFromTo(
        address _from, 
        address _to, 
        uint256 _balance
    ) external view returns(uint256);
    
    /**
    * @notice Get delegated the vote power `_from` delegator delegated `_to` delegatee at `_blockNumber`.
    * @param _from Address of delegator
    * @param _to Address of delegatee
    * @param _balance The delegator's current balance
    * @param _blockNumber The block number at which to fetch.
    * @return The delegated vote power.
    */
    function votePowerFromToAt(
        address _from, 
        address _to, 
        uint256 _balance,
        uint _blockNumber
    ) external view returns(uint256);

    /**
     * @notice Compute the current undelegated vote power of `_owner`
     * @param _owner The address to get undelegated voting power.
     * @param _balance Owner's current balance
     * @return The unallocated vote power of `_owner`
     */
    function undelegatedVotePowerOf(
        address _owner,
        uint256 _balance
    ) external view returns(uint256);

    /**
     * @notice Get the undelegated vote power of `_owner` at given block.
     * @param _owner The address to get undelegated voting power.
     * @param _blockNumber The block number at which to fetch.
     * @return The undelegated vote power of `_owner` (= owner's own balance minus all delegations from owner)
     */
    function undelegatedVotePowerOfAt(
        address _owner, 
        uint256 _balance,
        uint256 _blockNumber
    ) external view returns(uint256);

    /**
     * @notice Get the delegation mode for '_who'. This mode determines whether vote power is
     *  allocated by percentage or by explicit value.
     * @param _who The address to get delegation mode.
     * @return Delegation mode (NOTSET=0, PERCENTAGE=1, AMOUNT=2))
     */
    function delegationModeOf(address _who) external view returns (uint256);
    
    /**
    * @notice Get the vote power delegation `_delegateAddresses` 
    *  and `pcts` of an `_owner`. Returned in two separate positional arrays.
    * @param _owner The address to get delegations.
    * @return _delegateAddresses Positional array of delegation addresses.
    * @return _bips Positional array of delegation percents specified in basis points (1/100 or 1 percent)
    * @return _count The number of delegates.
    * @return _delegationMode The mode of the delegation (NOTSET=0, PERCENTAGE=1, AMOUNT=2).
    */
    function delegatesOf(
        address _owner
    )
        external view 
        returns (
            address[] memory _delegateAddresses, 
            uint256[] memory _bips,
            uint256 _count,
            uint256 _delegationMode
        );

    /**
    * @notice Get the vote power delegation `delegationAddresses` 
    *  and `pcts` of an `_owner`. Returned in two separate positional arrays.
    * @param _owner The address to get delegations.
    * @param _blockNumber The block for which we want to know the delegations.
    * @return _delegateAddresses Positional array of delegation addresses.
    * @return _bips Positional array of delegation percents specified in basis points (1/100 or 1 percent)
    * @return _count The number of delegates.
    * @return _delegationMode The mode of the delegation (NOTSET=0, PERCENTAGE=1, AMOUNT=2).
    */
    function delegatesOfAt(
        address _owner,
        uint256 _blockNumber
    )
        external view 
        returns (
            address[] memory _delegateAddresses, 
            uint256[] memory _bips,
            uint256 _count,
            uint256 _delegationMode
        );

    /**
     * The VPToken (or some other contract) that owns this VPContract.
     * All state changing methods may be called only from this address.
     * This is because original msg.sender is sent in `_from` parameter
     * and we must be sure that it cannot be faked by directly calling VPContract.
     * Owner token is also used in case of replacement to recover vote powers from balances.
     */
    function ownerToken() external view returns (IVPToken);
    
    /**
     * Return true if this IIVPContract is configured to be used as a replacement for other contract.
     * It means that vote powers are not necessarily correct at the initialization, therefore
     * every method that reads vote power must check whether it is initialized for that address and block.
     */
    function isReplacement() external view returns (bool);
}
          

./contracts/userInterfaces/IVPContractEvents.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

interface IVPContractEvents {
    /**
     * Event triggered when an account delegates or undelegates another account. 
     * Definition: `votePowerFromTo(from, to)` is `changed` from `priorVotePower` to `newVotePower`.
     * For undelegation, `newVotePower` is 0.
     *
     * Note: the event is always emitted from VPToken's `writeVotePowerContract`.
     */
    event Delegate(address indexed from, address indexed to, uint256 priorVotePower, uint256 newVotePower);
    
    /**
     * Event triggered only when account `delegator` revokes delegation to `delegatee`
     * for a single block in the past (typically the current vote block).
     *
     * Note: the event is always emitted from VPToken's `writeVotePowerContract` and/or `readVotePowerContract`.
     */
    event Revoke(address indexed delegator, address indexed delegatee, uint256 votePower, uint256 blockNumber);
}
          

./contracts/inflation/implementation/Supply.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "../interface/IISupply.sol";
import "../../tokenPools/interface/IITokenPool.sol";
import "../../token/lib/CheckPointHistory.sol";
import "../../token/lib/CheckPointHistoryCache.sol";
import "../../governance/implementation/Governed.sol";
import "../../addressUpdater/implementation/AddressUpdatable.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";


/**
 * @title Supply contract
 * @notice This contract maintains and computes various native token supply totals.
 **/

contract Supply is IISupply, Governed, AddressUpdatable {
    using CheckPointHistory for CheckPointHistory.CheckPointHistoryState;
    using CheckPointHistoryCache for CheckPointHistoryCache.CacheState;
    using SafeMath for uint256;

    address payable private constant BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD;
    
    struct SupplyData {
        IITokenPool tokenPool;
        uint256 totalLockedWei;
        uint256 totalInflationAuthorizedWei;
        uint256 totalClaimedWei;
    }

    string internal constant ERR_INFLATION_ONLY = "inflation only";
    string internal constant ERR_TOKEN_POOL_ALREADY_ADDED = "token pool already added";
    string internal constant ERR_INITIAL_GENESIS_AMOUNT_ZERO = "initial genesis amount zero";

    CheckPointHistory.CheckPointHistoryState private circulatingSupplyWei;
    CheckPointHistoryCache.CacheState private circulatingSupplyWeiCache;

    uint256 immutable public initialGenesisAmountWei;
    uint256 immutable public totalExcludedSupplyWei; // Foundation supply, distribution treasury, team escrow
    uint256 public distributedExcludedSupplyWei;
    uint256 public totalLockedWei; // Amounts temporary locked and not considered in the inflatable supply
    uint256 public totalInflationAuthorizedWei;
    uint256 public totalClaimedWei;

    SupplyData[] public tokenPools;

    address public inflation;

    // balance of burn address at last check - needed for updating circulating supply
    uint256 private burnAddressBalance;

    // events
    event AuthorizedInflationUpdateError(uint256 actual, uint256 expected);

    modifier onlyInflation {
        require(msg.sender == inflation, ERR_INFLATION_ONLY);
        _;
    }

    constructor(
        address _governance,
        address _addressUpdater,
        uint256 _initialGenesisAmountWei,
        uint256 _totalExcludedSupplyWei,
        IITokenPool[] memory _tokenPools
    )
        Governed(_governance) AddressUpdatable(_addressUpdater)
    {
        require(_initialGenesisAmountWei > 0, ERR_INITIAL_GENESIS_AMOUNT_ZERO);
        initialGenesisAmountWei = _initialGenesisAmountWei;
        totalExcludedSupplyWei = _totalExcludedSupplyWei;

        _increaseCirculatingSupply(_initialGenesisAmountWei.sub(_totalExcludedSupplyWei));

        for (uint256 i = 0; i < _tokenPools.length; i++) {
            _addTokenPool(_tokenPools[i]);
        }

        _updateCirculatingSupply(BURN_ADDRESS);
    }

    /**
     * @notice Updates circulating supply
     * @dev Also updates the burn address amount
    */
    function updateCirculatingSupply() external override onlyInflation {
        _updateCirculatingSupply(BURN_ADDRESS);
    }

    /**
     * @notice Updates authorized inflation and circulating supply - emits event if error
     * @param _inflationAuthorizedWei               Authorized inflation
     * @dev Also updates the burn address amount
    */
    function updateAuthorizedInflationAndCirculatingSupply(
            uint256 _inflationAuthorizedWei
    )
        external override
        onlyInflation 
    {
        // Save old total inflation authorized value to compare with after update.
        uint256 oldTotalInflationAuthorizedWei = totalInflationAuthorizedWei;
        
        _updateCirculatingSupply(BURN_ADDRESS);
        
        // Check if new authorized inflation was distributed and updated correctly.
        if (totalInflationAuthorizedWei != oldTotalInflationAuthorizedWei.add(_inflationAuthorizedWei)) {
            emit AuthorizedInflationUpdateError(totalInflationAuthorizedWei - oldTotalInflationAuthorizedWei,
                _inflationAuthorizedWei);
        }
    }

    /**
     * @notice Adds token pool so it can call updateTokenPoolDistributedAmount method when 
        some tokens are distributed
     * @param _tokenPool                            Token pool address
     * @param _increaseDistributedSupplyByAmountWei If token pool was given initial supply from excluded supply, 
        increase distributed value by this amount
     */
    function addTokenPool(
        IITokenPool _tokenPool,
        uint256 _increaseDistributedSupplyByAmountWei
    )
        external
        onlyGovernance
    {
        _increaseDistributedSupply(_increaseDistributedSupplyByAmountWei);
        _addTokenPool(_tokenPool);
        _updateCirculatingSupply(BURN_ADDRESS);
    }

    /**
     * @notice Increase distributed supply when excluded funds are released to a token pool or team members
     * @param _amountWei                            Amount to increase by
     */
    function increaseDistributedSupply(uint256 _amountWei) external onlyGovernance {
        _increaseDistributedSupply(_amountWei);
        _updateCirculatingSupply(BURN_ADDRESS);
    }

    /**
     * @notice Descrease distributed supply if excluded funds are no longer locked to a token pool
     * @param _amountWei                            Amount to decrease by
     */
    function decreaseDistributedSupply(uint256 _amountWei) external onlyGovernance {
        distributedExcludedSupplyWei = distributedExcludedSupplyWei.sub(_amountWei);
        _decreaseCirculatingSupply(_amountWei);
        _updateCirculatingSupply(BURN_ADDRESS);
    }
    
    /**
     * @notice Get approximate circulating supply for given block number from cache - only past block
     * @param _blockNumber                          Block number
     * @return _circulatingSupplyWei Return approximate circulating supply for last known block <= _blockNumber
    */
    function getCirculatingSupplyAtCached(
        uint256 _blockNumber
    )
        external override 
        returns(uint256 _circulatingSupplyWei)
    {
        // use cache only for the past (the value will never change)
        require(_blockNumber < block.number, "Can only be used for past blocks");
        (_circulatingSupplyWei,) = circulatingSupplyWeiCache.valueAt(circulatingSupplyWei, _blockNumber);
    }
    
    /**
     * @notice Get approximate circulating supply for given block number
     * @param _blockNumber                          Block number
     * @return _circulatingSupplyWei Return approximate circulating supply for last known block <= _blockNumber
    */
    function getCirculatingSupplyAt(
        uint256 _blockNumber
    )
        external view override 
        returns(uint256 _circulatingSupplyWei)
    {
        return circulatingSupplyWei.valueAt(_blockNumber);
    }

    /**
     * @notice Get total inflatable balance (initial genesis amount + total claimed - total excluded/locked amount)
     * @return _inflatableBalanceWei Return inflatable balance
    */
    function getInflatableBalance() external view override returns(uint256 _inflatableBalanceWei) {
        return initialGenesisAmountWei
            .add(totalClaimedWei)
            .sub(totalExcludedSupplyWei.sub(distributedExcludedSupplyWei))
            .sub(totalLockedWei);
    }

    /**
     * Return the burn address (a constant).
     */
    function burnAddress() external pure returns (address payable) {
        return BURN_ADDRESS;
    }

    /**
     * @notice Implementation of the AddressUpdatable abstract method.
     */
    function _updateContractAddresses(
        bytes32[] memory _contractNameHashes,
        address[] memory _contractAddresses
    )
        internal override
    {
        inflation = _getContractAddress(_contractNameHashes, _contractAddresses, "Inflation");
    }

    function _increaseCirculatingSupply(uint256 _increaseBy) internal {
        circulatingSupplyWei.writeValue(circulatingSupplyWei.valueAtNow().add(_increaseBy));
    }

    function _decreaseCirculatingSupply(uint256 _descreaseBy) internal {
        circulatingSupplyWei.writeValue(circulatingSupplyWei.valueAtNow().sub(_descreaseBy));
    }

    function _updateCirculatingSupply(address _burnAddress) internal {
        uint256 len = tokenPools.length;
        for (uint256 i = 0; i < len; i++) {
            SupplyData storage data = tokenPools[i];

            uint256 newTotalLockedWei;
            uint256 newTotalInflationAuthorizedWei;
            uint256 newTotalClaimedWei;
            
            (newTotalLockedWei, newTotalInflationAuthorizedWei, newTotalClaimedWei) = 
                data.tokenPool.getTokenPoolSupplyData();
            assert(newTotalLockedWei.add(newTotalInflationAuthorizedWei) >= newTotalClaimedWei);
            
            // updates total inflation authorized with daily authorized inflation
            uint256 dailyInflationAuthorizedWei = newTotalInflationAuthorizedWei.sub(data.totalInflationAuthorizedWei);
            totalInflationAuthorizedWei = totalInflationAuthorizedWei.add(dailyInflationAuthorizedWei);

            // updates circulating supply
            uint256 claimChange = newTotalClaimedWei.sub(data.totalClaimedWei);
            _increaseCirculatingSupply(claimChange);
            totalClaimedWei = totalClaimedWei.add(claimChange);
            if (newTotalLockedWei >= data.totalLockedWei) {
                uint256 lockChange = newTotalLockedWei - data.totalLockedWei;
                _decreaseCirculatingSupply(lockChange);
                totalLockedWei = totalLockedWei.add(lockChange);
            } else {
                // if founds are unlocked, they are returned to excluded amount
                uint256 lockChange = data.totalLockedWei - newTotalLockedWei;
                distributedExcludedSupplyWei = distributedExcludedSupplyWei.sub(lockChange);
                totalLockedWei = totalLockedWei.sub(lockChange);
            }

            // update data
            data.totalLockedWei = newTotalLockedWei;
            data.totalInflationAuthorizedWei = newTotalInflationAuthorizedWei;
            data.totalClaimedWei = newTotalClaimedWei;
        }

        _updateBurnAddressAmount(_burnAddress);
    }

    function _updateBurnAddressAmount(address _burnAddress) internal {
        uint256 newBalance = _burnAddress.balance;
        _decreaseCirculatingSupply(newBalance.sub(burnAddressBalance));
        burnAddressBalance = newBalance;
    }

    function _addTokenPool(IITokenPool _tokenPool) internal {
        uint256 len = tokenPools.length;
        for (uint256 i = 0; i < len; i++) {
            if (_tokenPool == tokenPools[i].tokenPool) {
                revert(ERR_TOKEN_POOL_ALREADY_ADDED);
            }
        }
        tokenPools.push();
        tokenPools[len].tokenPool = _tokenPool;
    }
    
    function _increaseDistributedSupply(uint256 _amountWei) internal {
        assert(totalExcludedSupplyWei.sub(distributedExcludedSupplyWei) >= _amountWei);
        _increaseCirculatingSupply(_amountWei);
        distributedExcludedSupplyWei = distributedExcludedSupplyWei.add(_amountWei);
    }
}
          

./contracts/token/lib/PercentageDelegation.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "./CheckPointHistory.sol";
import "./DelegationHistory.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "../../utils/implementation/SafePct.sol";


/**
 * @title PercentageDelegation library
 * @notice Only handles percentage delegation  
 * @notice A library to manage a group of _delegates for allocating voting power by a delegator.
 **/
library PercentageDelegation {
    using CheckPointHistory for CheckPointHistory.CheckPointHistoryState;
    using DelegationHistory for DelegationHistory.CheckPointHistoryState;
    using SafeMath for uint256;
    using SafePct for uint256;

    uint256 public constant MAX_BIPS = 10000;
    string private constant MAX_BIPS_MSG = "Max delegation bips exceeded";
    
    /**
     * @dev `DelegationState` is the state structure used by this library to contain/manage
     *  a grouing of _delegates (a PercentageDelegation) for a delegator.
     */
    struct DelegationState {
        // percentages by _delegates
        DelegationHistory.CheckPointHistoryState delegation;
    }

    /**
     * @notice Add or replace an existing _delegate with allocated vote power in basis points.
     * @param _self A DelegationState instance to manage.
     * @param _delegate The address of the _delegate to add/replace
     * @param _bips Allocation of the delegation specified in basis points (1/100 of 1 percent)
     * @dev If you send a `_bips` of zero, `_delegate` will be deleted if one
     *  exists in the delegation; if zero and `_delegate` does not exist, it will not be added.
     */
    function addReplaceDelegate(
        DelegationState storage _self, 
        address _delegate, 
        uint256 _bips
    )
        internal
    {
        // Check for max delegation basis points
        assert(_bips <= MAX_BIPS);

        // Change the delegate's percentage
        _self.delegation.writeValue(_delegate, _bips);
        
        // check the total
        require(_self.delegation.totalValueAtNow() <= MAX_BIPS, MAX_BIPS_MSG);
    }

    /**
     * @notice Get the total of the explicit vote power delegation bips of all delegates at given block.
     * @param _self A DelegationState instance to manage.
     * @param _blockNumber The block to query.
     * @return _totalBips The total vote power bips delegated.
     */
    function getDelegatedTotalAt(
        DelegationState storage _self,
        uint256 _blockNumber
    )
        internal view
        returns (uint256 _totalBips)
    {
        return _self.delegation.totalValueAt(_blockNumber);
    }

    /**
     * @notice Get the total of the bips vote power delegation bips of all _delegates.
     * @param _self A DelegationState instance to manage.
     * @return _totalBips The total vote power bips delegated.
     */
    function getDelegatedTotal(
        DelegationState storage _self
    )
        internal view
        returns (uint256 _totalBips)
    {
        return _self.delegation.totalValueAtNow();
    }

    /**
     * @notice Given a _delegate address, return the bips of the vote power delegation.
     * @param _self A DelegationState instance to manage.
     * @param _delegate The delegate address to find.
     * @param _blockNumber The block to query.
     * @return _bips The percent of vote power allocated to the delegate address.
     */
    function getDelegatedValueAt(
        DelegationState storage _self, 
        address _delegate,
        uint256 _blockNumber
    )
        internal view 
        returns (uint256 _bips)
    {
        return _self.delegation.valueOfAt(_delegate, _blockNumber);
    }

    /**
     * @notice Given a delegate address, return the bips of the vote power delegation.
     * @param _self A DelegationState instance to manage.
     * @param _delegate The delegate address to find.
     * @return _bips The percent of vote power allocated to the delegate address.
     */
    function getDelegatedValue(
        DelegationState storage _self, 
        address _delegate
    )
        internal view
        returns (uint256 _bips)
    {
        return _self.delegation.valueOfAtNow(_delegate);
    }

    /**
     * @notice Returns lists of delegate addresses and corresponding values at given block.
     * @param _self A DelegationState instance to manage.
     * @param _blockNumber The block to query.
     * @return _delegates Positional array of delegation addresses.
     * @return _values Positional array of delegation percents specified in basis points (1/100 or 1 percent)
     */
    function getDelegationsAt(
        DelegationState storage _self,
        uint256 _blockNumber
    )
        internal view 
        returns (
            address[] memory _delegates,
            uint256[] memory _values
        )
    {
        return _self.delegation.delegationsAt(_blockNumber);
    }
    
    /**
     * @notice Returns lists of delegate addresses and corresponding values.
     * @param _self A DelegationState instance to manage.
     * @return _delegates Positional array of delegation addresses.
     * @return _values Positional array of delegation percents specified in basis points (1/100 or 1 percent)
     */
    function getDelegations(
        DelegationState storage _self
    )
        internal view
        returns (
            address[] memory _delegates,
            uint256[] memory _values
        ) 
    {
        return _self.delegation.delegationsAtNow();
    }
    
    /**
     * Get all percentage delegations active now.
     * @param _self A CheckPointHistoryState instance to manage.
     * @return _length The number of delegations. 
     * @return _delegations . 
     **/
    function getDelegationsRaw(
        DelegationState storage _self
    )
        internal view
        returns (
            uint256 _length, 
            mapping(uint256 => DelegationHistory.Delegation) storage _delegations
        )
    {
        return _self.delegation.delegationsAtNowRaw();
    }
    
    /**
     * Get the number of delegations.
     * @param _self A DelegationState instance to manage.
     * @param _blockNumber The block number to query. 
     * @return _count Count of delegations at the time.
     **/
    function getCountAt(
        DelegationState storage _self,
        uint256 _blockNumber
    )
        internal view 
        returns (uint256 _count)
    {
        return _self.delegation.countAt(_blockNumber);
    }

    /**
     * Get the number of delegations.
     * @param _self A DelegationState instance to manage.
     * @return _count Count of delegations at the time.
     **/
    function getCount(
        DelegationState storage _self
    )
        internal view
        returns (uint256 _count)
    {
        return _self.delegation.countAt(block.number);
    }
    
    /**
     * @notice Get the total amount (absolute) of the vote power delegation of all delegates.
     * @param _self A DelegationState instance to manage.
     * @param _balance Owner's balance.
     * @return _totalAmount The total vote power amount delegated.
     */
    function getDelegatedTotalAmountAt(
        DelegationState storage _self, 
        uint256 _balance,
        uint256 _blockNumber
    )
        internal view 
        returns (uint256 _totalAmount)
    {
        return _self.delegation.scaledTotalValueAt(_balance, MAX_BIPS, _blockNumber);
    }
    
    /**
     * @notice Clears all delegates.
     * @param _self A DelegationState instance to manage.
     * @dev Delegation mode remains PERCENTAGE, even though the delgation is now empty.
     */
    function clear(DelegationState storage _self) internal {
        _self.delegation.clear();
    }


    /**
     * Delete at most `_count` of the oldest checkpoints.
     * At least one checkpoint at or before `_cleanupBlockNumber` will remain 
     * (unless the history was empty to start with).
     */    
    function cleanupOldCheckpoints(
        DelegationState storage _self, 
        uint256 _count,
        uint256 _cleanupBlockNumber
    )
        internal
        returns (uint256)
    {
        return _self.delegation.cleanupOldCheckpoints(_count, _cleanupBlockNumber);
    }
}
          

./contracts/token/lib/ExplicitDelegation.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "./CheckPointsByAddress.sol";
import "./CheckPointHistory.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "../../utils/implementation/SafePct.sol";


/**
 * @title ExplicitDelegation library
 * @notice A library to manage a group of delegates for allocating voting power by a delegator.
 **/
library ExplicitDelegation {
    using CheckPointHistory for CheckPointHistory.CheckPointHistoryState;
    using CheckPointsByAddress for CheckPointsByAddress.CheckPointsByAddressState;
    using SafeMath for uint256;
    using SafePct for uint256;

    /**
     * @dev `DelegationState` is the state structure used by this library to contain/manage
     *  a grouing of delegates (a ExplicitDelegation) for a delegator.
     */
    struct DelegationState {
        CheckPointHistory.CheckPointHistoryState delegatedTotal;

        // `delegatedVotePower` is a map of delegators pointing to a map of delegates
        // containing a checkpoint history of delegated vote power balances.
        CheckPointsByAddress.CheckPointsByAddressState delegatedVotePower;
    }

    /**
     * @notice Add or replace an existing _delegate with new vote power (explicit).
     * @param _self A DelegationState instance to manage.
     * @param _delegate The address of the _delegate to add/replace
     * @param _amount Allocation of the delegation as explicit amount
     */
    function addReplaceDelegate(
        DelegationState storage _self, 
        address _delegate, 
        uint256 _amount
    )
        internal
    {
        uint256 prevAmount = _self.delegatedVotePower.valueOfAtNow(_delegate);
        uint256 newTotal = _self.delegatedTotal.valueAtNow().sub(prevAmount, "Total < 0").add(_amount);
        _self.delegatedVotePower.writeValue(_delegate, _amount);
        _self.delegatedTotal.writeValue(newTotal);
    }
    

    /**
     * Delete at most `_count` of the oldest checkpoints.
     * At least one checkpoint at or before `_cleanupBlockNumber` will remain 
     * (unless the history was empty to start with).
     */    
    function cleanupOldCheckpoints(
        DelegationState storage _self, 
        address _owner, 
        uint256 _count,
        uint256 _cleanupBlockNumber
    )
        internal
        returns(uint256 _deleted)
    {
        _deleted = _self.delegatedTotal.cleanupOldCheckpoints(_count, _cleanupBlockNumber);
        // safe: cleanupOldCheckpoints always returns the number of deleted elements which is small, so no owerflow
        _deleted += _self.delegatedVotePower.cleanupOldCheckpoints(_owner, _count, _cleanupBlockNumber);
    }
    
    /**
     * @notice Get the _total of the explicit vote power delegation amount.
     * @param _self A DelegationState instance to manage.
     * @param _blockNumber The block to query.
     * @return _total The _total vote power amount delegated.
     */
    function getDelegatedTotalAt(
        DelegationState storage _self, uint256 _blockNumber
    )
        internal view 
        returns (uint256 _total)
    {
        return _self.delegatedTotal.valueAt(_blockNumber);
    }
    
    /**
     * @notice Get the _total of the explicit vote power delegation amount.
     * @param _self A DelegationState instance to manage.
     * @return _total The total vote power amount delegated.
     */
    function getDelegatedTotal(
        DelegationState storage _self
    )
        internal view 
        returns (uint256 _total)
    {
        return _self.delegatedTotal.valueAtNow();
    }
    
    /**
     * @notice Given a delegate address, return the explicit amount of the vote power delegation.
     * @param _self A DelegationState instance to manage.
     * @param _delegate The _delegate address to find.
     * @param _blockNumber The block to query.
     * @return _value The percent of vote power allocated to the _delegate address.
     */
    function getDelegatedValueAt(
        DelegationState storage _self, 
        address _delegate,
        uint256 _blockNumber
    )
        internal view
        returns (uint256 _value)
    {
        return _self.delegatedVotePower.valueOfAt(_delegate, _blockNumber);
    }

    /**
     * @notice Given a delegate address, return the explicit amount of the vote power delegation.
     * @param _self A DelegationState instance to manage.
     * @param _delegate The _delegate address to find.
     * @return _value The percent of vote power allocated to the _delegate address.
     */
    function getDelegatedValue(
        DelegationState storage _self, 
        address _delegate
    )
        internal view 
        returns (uint256 _value)
    {
        return _self.delegatedVotePower.valueOfAtNow(_delegate);
    }
}
          

@openzeppelin/contracts/token/ERC20/IERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
          

./contracts/userInterfaces/IGovernanceVotePower.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

interface IGovernanceVotePower {
    /**
     * @notice Delegate all governance vote power of `msg.sender` to `_to`.
     * @param _to The address of the recipient
     **/
    function delegate(address _to) external;

    /**
     * @notice Undelegate all governance vote power of `msg.sender``.
     **/
    function undelegate() external;

    /**
    * @notice Get the governance vote power of `_who` at block `_blockNumber`
    * @param _who The address to get voting power.
    * @param _blockNumber The block number at which to fetch.
    * @return _votePower    Governance vote power of `_who` at `_blockNumber`.
    */
    function votePowerOfAt(address _who, uint256 _blockNumber) external view returns(uint256);

    /**
    * @notice Get the vote power of `account` at the current block.
    * @param account The address to get voting power.
    * @return Vote power of `account` at the current block number.
    */    
    function getVotes(address account) external view returns (uint256);

    /**
    * @notice Get the delegate's address of `_who` at block `_blockNumber`
    * @param _who The address to get delegate's address.
    * @param _blockNumber The block number at which to fetch.
    * @return Delegate's address of `_who` at `_blockNumber`.
    */
    function getDelegateOfAt(address _who, uint256 _blockNumber) external view returns (address);

    /**
    * @notice Get the delegate's address of `_who` at the current block.
    * @param _who The address to get delegate's address.
    * @return Delegate's address of `_who` at the current block number.
    */    
    function getDelegateOfAtNow(address _who) external  view returns (address);

}
          

Contract ABI

[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"_governance","internalType":"address"},{"type":"address","name":"_addressUpdater","internalType":"address"},{"type":"address","name":"_priceSubmitter","internalType":"contract IPriceSubmitter"},{"type":"address","name":"_treasury","internalType":"contract DistributionTreasury"},{"type":"uint256","name":"_totalEntitlementWei","internalType":"uint256"},{"type":"uint256","name":"_latestEntitlementStartTs","internalType":"uint256"}]},{"type":"event","name":"AccountClaimed","inputs":[{"type":"address","name":"whoClaimed","internalType":"address","indexed":true},{"type":"address","name":"sentTo","internalType":"address","indexed":true},{"type":"uint256","name":"month","internalType":"uint256","indexed":false},{"type":"uint256","name":"amountWei","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"AccountOptOut","inputs":[{"type":"address","name":"theAccount","internalType":"address","indexed":true},{"type":"bool","name":"confirmed","internalType":"bool","indexed":false}],"anonymous":false},{"type":"event","name":"AllowedClaimRecipientsChanged","inputs":[{"type":"address","name":"rewardOwner","internalType":"address","indexed":false},{"type":"address[]","name":"recipients","internalType":"address[]","indexed":false}],"anonymous":false},{"type":"event","name":"ClaimExecutorsChanged","inputs":[{"type":"address","name":"rewardOwner","internalType":"address","indexed":false},{"type":"address[]","name":"executors","internalType":"address[]","indexed":false}],"anonymous":false},{"type":"event","name":"EntitlementStart","inputs":[{"type":"uint256","name":"entitlementStartTs","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"GovernanceCallTimelocked","inputs":[{"type":"bytes4","name":"selector","internalType":"bytes4","indexed":false},{"type":"uint256","name":"allowedAfterTimestamp","internalType":"uint256","indexed":false},{"type":"bytes","name":"encodedCall","internalType":"bytes","indexed":false}],"anonymous":false},{"type":"event","name":"GovernanceInitialised","inputs":[{"type":"address","name":"initialGovernance","internalType":"address","indexed":false}],"anonymous":false},{"type":"event","name":"GovernedProductionModeEntered","inputs":[{"type":"address","name":"governanceSettings","internalType":"address","indexed":false}],"anonymous":false},{"type":"event","name":"TimelockedGovernanceCallCanceled","inputs":[{"type":"bytes4","name":"selector","internalType":"bytes4","indexed":false},{"type":"uint256","name":"timestamp","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"TimelockedGovernanceCallExecuted","inputs":[{"type":"bytes4","name":"selector","internalType":"bytes4","indexed":false},{"type":"uint256","name":"timestamp","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"address[]","name":"","internalType":"address[]"}],"name":"allowedClaimRecipients","inputs":[{"type":"address","name":"_rewardOwner","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"cancelGovernanceCall","inputs":[{"type":"bytes4","name":"_selector","internalType":"bytes4"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"_amountWei","internalType":"uint256"}],"name":"claim","inputs":[{"type":"address","name":"_recipient","internalType":"address"},{"type":"uint256","name":"_month","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"_amountWei","internalType":"uint256"}],"name":"claimAndWrap","inputs":[{"type":"address","name":"_recipient","internalType":"address"},{"type":"uint256","name":"_month","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"_amountWei","internalType":"uint256"}],"name":"claimAndWrapByExecutor","inputs":[{"type":"address","name":"_rewardOwner","internalType":"address"},{"type":"address","name":"_recipient","internalType":"address"},{"type":"uint256","name":"_month","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"_amountWei","internalType":"uint256"}],"name":"claimByExecutor","inputs":[{"type":"address","name":"_rewardOwner","internalType":"address"},{"type":"address","name":"_recipient","internalType":"address"},{"type":"uint256","name":"_month","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address[]","name":"","internalType":"address[]"}],"name":"claimExecutors","inputs":[{"type":"address","name":"_rewardOwner","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"_amountWei","internalType":"uint256"}],"name":"claimToPersonalDelegationAccount","inputs":[{"type":"uint256","name":"_month","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"_amountWei","internalType":"uint256"}],"name":"claimToPersonalDelegationAccountByExecutor","inputs":[{"type":"address","name":"_rewardOwner","internalType":"address"},{"type":"uint256","name":"_month","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"confirmOptOutOfAirdrop","inputs":[{"type":"address[]","name":"_optOutAddresses","internalType":"address[]"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract DelegationAccountManager"}],"name":"delegationAccountManager","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"endBlockNumber","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"entitlementStartTs","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"executeGovernanceCall","inputs":[{"type":"bytes4","name":"_selector","internalType":"bytes4"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"_addressUpdater","internalType":"address"}],"name":"getAddressUpdater","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"_amountWei","internalType":"uint256"}],"name":"getClaimableAmount","inputs":[{"type":"uint256","name":"_month","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"_amountWei","internalType":"uint256"}],"name":"getClaimableAmountOf","inputs":[{"type":"address","name":"_account","internalType":"address"},{"type":"uint256","name":"_month","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"_amountWei","internalType":"uint256"}],"name":"getClaimedAmount","inputs":[{"type":"uint256","name":"_month","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"_amountWei","internalType":"uint256"}],"name":"getClaimedAmountOf","inputs":[{"type":"address","name":"_account","internalType":"address"},{"type":"uint256","name":"_month","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"_currentMonth","internalType":"uint256"}],"name":"getCurrentMonth","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"_monthToExpireNext","internalType":"uint256"}],"name":"getMonthToExpireNext","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"_lockedFundsWei","internalType":"uint256"},{"type":"uint256","name":"_totalInflationAuthorizedWei","internalType":"uint256"},{"type":"uint256","name":"_totalClaimedWei","internalType":"uint256"}],"name":"getTokenPoolSupplyData","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"governance","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IGovernanceSettings"}],"name":"governanceSettings","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"initialise","inputs":[{"type":"address","name":"_initialGovernance","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"latestEntitlementStartTs","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"optOut","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"optOutAddresses","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"optOutCandidate","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"optOutOfAirdrop","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IPriceSubmitter"}],"name":"priceSubmitter","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"productionMode","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"_timeTill","internalType":"uint256"}],"name":"secondsTillNextClaim","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setAllowedClaimRecipients","inputs":[{"type":"address[]","name":"_recipients","internalType":"address[]"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setClaimExecutors","inputs":[{"type":"address[]","name":"_executors","internalType":"address[]"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setEntitlementStart","inputs":[{"type":"uint256","name":"_entitlementStartTs","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"startBlockNumber","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"stop","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"stopped","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract Supply"}],"name":"supply","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"switchToProductionMode","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"allowedAfterTimestamp","internalType":"uint256"},{"type":"bytes","name":"encodedCall","internalType":"bytes"}],"name":"timelockedCalls","inputs":[{"type":"bytes4","name":"","internalType":"bytes4"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalAvailableAmount","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalBurnedWei","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalClaimedWei","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalDistributableAmount","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalEntitlementWei","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalUnclaimedAmount","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalUnclaimedWeight","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract DistributionTreasury"}],"name":"treasury","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updateContractAddresses","inputs":[{"type":"bytes32[]","name":"_contractNameHashes","internalType":"bytes32[]"},{"type":"address[]","name":"_contractAddresses","internalType":"address[]"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updateTotalEntitlementWei","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"votePowerBlockNumbers","inputs":[{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract WNat"}],"name":"wNat","inputs":[]},{"type":"receive","stateMutability":"payable"}]
            

Deployed ByteCode

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