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

import "@openzeppelin/contracts/access/Ownable.sol";
import "./base/ERC20Dividends.sol";
import "./libraries/TransferHelper.sol";
import "./interfaces/IWETH.sol";


contract ERC20DividendsOwned is ERC20Dividends, Ownable {
  using TransferHelper for address;

  address public immutable weth;

  receive() external payable { return; }

  constructor(
    address weth_,
    string memory name_,
    string memory symbol_
  ) ERC20Dividends(name_, symbol_) Ownable() {
    weth = weth_;
  }

  function mint(address to, uint256 amount) external onlyOwner {
    _mint(to, amount);
  }

  function burn(address from, uint256 amount) external onlyOwner {
    _burn(from, amount);
  }

  function collect() external {
    uint256 amount = _prepareCollect(msg.sender);
    weth.safeTransfer(msg.sender, amount);
  }

  function collectETH() external {
    uint256 amount = _prepareCollect(msg.sender);
    IWETH(weth).withdraw(amount);
    address(msg.sender).safeTransferETH(amount);
  }

  function distribute(uint256 amount) external {
    weth.safeTransferFrom(msg.sender, address(this), amount);
    _distributeDividends(amount);
  }

  function distribute() external payable {
    IWETH(weth).deposit{value: msg.value}();
    _distributeDividends(msg.value);
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @title SignedSafeMath
 * @dev Signed math operations with safety checks that revert on error.
 */
library SignedSafeMath {
    int256 constant private _INT256_MIN = -2**255;

    /**
     * @dev Returns the multiplication of two signed integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(int256 a, int256 b) internal pure returns (int256) {
        // 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 0;
        }

        require(!(a == -1 && b == _INT256_MIN), "SignedSafeMath: multiplication overflow");

        int256 c = a * b;
        require(c / a == b, "SignedSafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two signed integers. Reverts 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(int256 a, int256 b) internal pure returns (int256) {
        require(b != 0, "SignedSafeMath: division by zero");
        require(!(b == -1 && a == _INT256_MIN), "SignedSafeMath: division overflow");

        int256 c = a / b;

        return c;
    }

    /**
     * @dev Returns the subtraction of two signed integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a - b;
        require((b >= 0 && c <= a) || (b < 0 && c > a), "SignedSafeMath: subtraction overflow");

        return c;
    }

    /**
     * @dev Returns the addition of two signed integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a + b;
        require((b >= 0 && c >= a) || (b < 0 && c < a), "SignedSafeMath: addition overflow");

        return c;
    }
}

// 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;
    }
}

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

import "@openzeppelin/contracts/math/SignedSafeMath.sol";
import "../libraries/LowGasSafeMath.sol";
import "../libraries/SafeCast.sol";
import "../interfaces/IAbstractDividends.sol";

/**
 * @dev Many functions in this contract were taken from this repository:
 * https://github.com/atpar/funds-distribution-token/blob/master/contracts/FundsDistributionToken.sol
 * which is an example implementation of ERC 2222, the draft for which can be found at
 * https://github.com/atpar/funds-distribution-token/blob/master/EIP-DRAFT.md
 *
 * This contract has been substantially modified from the original and does not comply with ERC 2222.
 * Many functions were renamed as "dividends" rather than "funds" and the core functionality was separated
 * into this abstract contract which can be inherited by anything tracking ownership of dividend shares.
 */
abstract contract AbstractDividends is IAbstractDividends {
  using LowGasSafeMath for uint256;
  using SafeCast for uint128;
  using SafeCast for uint256;
  using SafeCast for int256;
  using SignedSafeMath for int256;

/* ========  Constants  ======== */
  uint128 internal constant POINTS_MULTIPLIER = type(uint128).max;

/* ========  Internal Function References  ======== */
  function(address) view returns (uint256) private immutable getSharesOf;
  function() view returns (uint256) private immutable getTotalShares;

/* ========  Storage  ======== */
  uint256 public pointsPerShare;
  mapping(address => int256) internal pointsCorrection;
  mapping(address => uint256) private withdrawnDividends;

  constructor(
    function(address) view returns (uint256) getSharesOf_,
    function() view returns (uint256) getTotalShares_
  ) {
    getSharesOf = getSharesOf_;
    getTotalShares = getTotalShares_;
  }

/* ========  Public View Functions  ======== */
  /**
   * @dev Returns the total amount of dividends a given address is able to withdraw.
   * @param account Address of a dividend recipient
   * @return A uint256 representing the dividends `account` can withdraw
   */
  function withdrawableDividendsOf(address account) public view override returns (uint256) {
    return cumulativeDividendsOf(account).sub(withdrawnDividends[account]);
  }

  /**
   * @notice View the amount of dividends that an address has withdrawn.
   * @param account The address of a token holder.
   * @return The amount of dividends that `account` has withdrawn.
   */
  function withdrawnDividendsOf(address account) public view override returns (uint256) {
    return withdrawnDividends[account];
  }

  /**
   * @notice View the amount of dividends that an address has earned in total.
   * @dev accumulativeFundsOf(account) = withdrawableDividendsOf(account) + withdrawnDividendsOf(account)
   * = (pointsPerShare * balanceOf(account) + pointsCorrection[account]) / POINTS_MULTIPLIER
   * @param account The address of a token holder.
   * @return The amount of dividends that `account` has earned in total.
   */
  function cumulativeDividendsOf(address account) public view override returns (uint256) {
    return pointsPerShare
      .mul(getSharesOf(account))
      .toInt256()
      .add(pointsCorrection[account])
      .toUint256() / POINTS_MULTIPLIER;
  }

/* ========  Dividend Utility Functions  ======== */

  /** 
   * @notice Distributes dividends to token holders.
   * @dev It reverts if the total supply is 0.
   * It emits the `FundsDistributed` event if the amount to distribute is greater than 0.
   * About undistributed dividends:
   *   In each distribution, there is a small amount which does not get distributed,
   *   which is `(amount * POINTS_MULTIPLIER) % totalShares()`.
   *   With a well-chosen `POINTS_MULTIPLIER`, the amount of funds that are not getting
   *   distributed in a distribution can be less than 1 (base unit).
   */
  function _distributeDividends(uint256 amount) internal {
    uint256 shares = getTotalShares();
    require(shares > 0, "SHARES");

    if (amount > 0) {
      pointsPerShare = pointsPerShare.add(
        amount.mul(POINTS_MULTIPLIER) / shares
      );
      emit DividendsDistributed(msg.sender, amount);
    }
  }

  /**
   * @notice Prepares collection of owed dividends
   * @dev It emits a `DividendsWithdrawn` event if the amount of withdrawn dividends is
   * greater than 0.
   */
  function _prepareCollect(address account) internal returns (uint256) {
    uint256 _withdrawableDividend = withdrawableDividendsOf(account);
    if (_withdrawableDividend > 0) {
      withdrawnDividends[account] = withdrawnDividends[account].add(_withdrawableDividend);
      emit DividendsWithdrawn(account, _withdrawableDividend);
    }
    return _withdrawableDividend;
  }

  function _correctPointsForTransfer(address from, address to, uint256 shares) internal {
    int256 _magCorrection = pointsPerShare.mul(shares).toInt256();
    pointsCorrection[from] = pointsCorrection[from].add(_magCorrection);
    pointsCorrection[to] = pointsCorrection[to].sub(_magCorrection);
  }

  /**
   * @dev Increases or decreases the points correction for `account` by
   * `shares*pointsPerShare`.
   */
  function _correctPoints(address account, int256 shares) internal {
    pointsCorrection[account] = pointsCorrection[account]
      .add(shares.mul(int256(pointsPerShare)));
  }
}

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

import "./ERC20VotesComp.sol";
import "./AbstractDividends.sol";


contract ERC20Dividends is ERC20VotesComp, AbstractDividends {
  constructor(string memory name, string memory symbol)
    ERC20VotesComp(name, symbol)
    AbstractDividends(balanceOf, totalSupply)
  {}

	/**
	 * @dev Internal function that transfer tokens from one address to another.
	 * Update pointsCorrection to keep funds unchanged.
	 * @param from The address to transfer from.
	 * @param to The address to transfer to.
	 * @param value The amount to be transferred.
	 */
	function _transfer(address from, address to, uint96 value) internal virtual override {
		super._transfer(from, to, value);
    _correctPointsForTransfer(from, to, value);
	}

	/**
	 * @dev Internal function that mints tokens to an account.
	 * Update pointsCorrection to keep funds unchanged.
	 * @param account The account that will receive the created tokens.
	 * @param amount The amount that will be created.
	 */
	function _mint(address account, uint256 amount) internal virtual override {
		super._mint(account, amount);
    _correctPoints(account, -int256(amount));
	}
	
	/** 
	 * @dev Internal function that burns an amount of the token of a given account.
	 * Update pointsCorrection to keep funds unchanged.
	 * @param account The account whose tokens will be burnt.
	 * @param amount The amount that will be burnt.
	 */
	function _burn(address account, uint256 amount) internal virtual override {
		super._burn(account, amount);
    _correctPoints(account, int256(amount));
	}
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
pragma abicoder v2;

import "../interfaces/IERC20VotesComp.sol";


contract ERC20VotesComp is IERC20VotesComp {
/** ========== Constants ==========  */

  /** @dev The EIP-712 typehash for the contract's domain */
  bytes32 public constant DOMAIN_TYPEHASH =
    keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");

  /** @dev The EIP-712 typehash for the delegation struct used by the contract */
  bytes32 public constant DELEGATION_TYPEHASH = keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");

  /** @dev The EIP-712 typehash for the permit struct used by the contract */
  bytes32 public constant PERMIT_TYPEHASH = keccak256(
    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
  );

  /** @dev The EIP-712 domain separator */
  bytes32 public immutable domainSeparator;

  /** @dev EIP-20 token decimals for this token */
  uint8 public constant decimals = 18;

  /** @dev EIP-20 token name for this token */
  string public name;

  /** @dev EIP-20 token symbol for this token */
  string public symbol;

/** ========== Storage ==========  */

  /** @dev Total number of tokens in circulation */
  uint96 internal _totalSupply;

  /** @dev Allowance amounts on behalf of others */
  mapping(address => mapping(address => uint96)) internal allowances;

  /** @dev Official record of token balances for each account */
  mapping(address => uint96) internal balances;

  /** @dev A record of each accounts delegate */
  mapping(address => address) public override delegates;

  /** @dev A record of votes checkpoints for each account, by index */
  mapping(address => mapping(uint32 => Checkpoint)) public override checkpoints;

  /** @dev The number of checkpoints for each account */
  mapping(address => uint32) public override numCheckpoints;

  /** @dev A record of states for signing / validating signatures */
  mapping(address => uint256) public override nonces;

/** ========== Constructor ==========  */

  constructor(string memory _name, string memory _symbol) {
    name = _name;
    symbol = _symbol;
    domainSeparator = keccak256(abi.encode(
      DOMAIN_TYPEHASH, keccak256(bytes(_name)), getChainId(), address(this)
    ));
  }

/** ========== Queries ==========  */

  function totalSupply() public view override returns (uint256) {
    return _totalSupply;
  }

  /**
   * @dev Get the number of tokens `spender` is approved to spend on behalf of `account`
   * @param account The address of the account holding the funds
   * @param spender The address of the account spending the funds
   * @return The number of tokens approved
   */
  function allowance(address account, address spender) public view override returns (uint256) {
    return allowances[account][spender];
  }

  /**
   * @dev Get the number of tokens held by the `account`
   * @param account The address of the account to get the balance of
   * @return The number of tokens held
   */
  function balanceOf(address account) public view override returns (uint256) {
    return balances[account];
  }

  /**
   * @dev Gets the current votes balance for `account`
   * @param account The address to get votes balance
   * @return The number of current votes for `account`
   */
  function getCurrentVotes(address account) external view override returns (uint96) {
    uint32 nCheckpoints = numCheckpoints[account];
    return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
  }

  /**
   * @dev Determine the prior number of votes for an account as of a block number
   * Block number must be a finalized block or else this function will revert to prevent misinformation.
   * @param account The address of the account to check
   * @param blockNumber The block number to get the vote balance at
   * @return The number of votes the account had as of the given block
   */
  function getPriorVotes(address account, uint256 blockNumber) external view override returns (uint96) {
    require(blockNumber < block.number, "not yet determined");

    uint32 nCheckpoints = numCheckpoints[account];
    if (nCheckpoints == 0) {
      return 0;
    }

    // First check most recent balance
    if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
      return checkpoints[account][nCheckpoints - 1].votes;
    }

    // Next check implicit zero balance
    if (checkpoints[account][0].fromBlock > blockNumber) {
      return 0;
    }

    uint32 lower = 0;
    uint32 upper = nCheckpoints - 1;
    while (upper > lower) {
      uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
      Checkpoint memory cp = checkpoints[account][center];
      if (cp.fromBlock == blockNumber) {
        return cp.votes;
      } else if (cp.fromBlock < blockNumber) {
        lower = center;
      } else {
        upper = center - 1;
      }
    }
    return checkpoints[account][lower].votes;
  }

/** ========== ERC20 Actions ==========  */

  /**
   * @dev Approve `spender` to transfer up to `amount` from `src`
   * This will overwrite the approval amount for `spender`
   *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
   * @param spender The address of the account which may transfer tokens
   * @param rawAmount The number of tokens that are approved (2^256-1 means infinite)
   * @return Whether or not the approval succeeded
   */
  function approve(address spender, uint256 rawAmount) external override returns (bool) {
    uint96 amount;
    if (rawAmount == uint256(-1)) {
      amount = uint96(-1);
    } else {
      amount = safe96(rawAmount);
    }

    allowances[msg.sender][spender] = amount;

    emit Approval(msg.sender, spender, amount);
    return true;
  }

  function permit(
    address owner,
    address spender,
    uint256 rawAmount,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external {
    uint96 amount;
    if (rawAmount == uint256(-1)) {
      amount = uint96(-1);
    } else {
      amount = safe96(rawAmount);
    }

    bytes32 structHash = keccak256(
      abi.encode(
        PERMIT_TYPEHASH,
        owner,
        spender,
        rawAmount,
        nonces[owner]++,
        deadline
      )
    );
    bytes32 digest = keccak256(
      abi.encodePacked("\x19\x01", domainSeparator, structHash)
    );
    address signatory = ecrecover(digest, v, r, s);
    require(signatory != address(0), "invalid signature");
    require(signatory == owner, "unauthorized");
    require(block.timestamp <= deadline, "signature expired");

    allowances[owner][spender] = amount;

    emit Approval(owner, spender, amount);
  }

  /**
   * @dev Transfer `amount` tokens from `msg.sender` to `dst`
   * @param dst The address of the destination account
   * @param rawAmount The number of tokens to transfer
   * @return Whether or not the transfer succeeded
   */
  function transfer(address dst, uint256 rawAmount) external override returns (bool) {
    uint96 amount = safe96(rawAmount);
    _transfer(msg.sender, dst, amount);
    return true;
  }

  /**
   * @dev Transfer `amount` tokens from `src` to `dst`
   * @param src The address of the source account
   * @param dst The address of the destination account
   * @param rawAmount The number of tokens to transfer
   * @return Whether or not the transfer succeeded
   */
  function transferFrom(
    address src,
    address dst,
    uint256 rawAmount
  ) external override returns (bool) {
    address spender = msg.sender;
    uint96 spenderAllowance = allowances[src][spender];
    uint96 amount = safe96(rawAmount);

    if (spender != src && spenderAllowance != uint96(-1)) {
      uint96 newAllowance =
        sub96(spenderAllowance, amount, "transfer amount exceeds allowance");
      allowances[src][spender] = newAllowance;

      emit Approval(src, spender, newAllowance);
    }

    _transfer(src, dst, amount);
    return true;
  }

/** ========== Delegation Actions ==========  */

  /**
   * @dev Delegate votes from `msg.sender` to `delegatee`
   * @param delegatee The address to delegate votes to
   */
  function delegate(address delegatee) external override {
    return _delegate(msg.sender, delegatee);
  }

  /**
   * @dev Delegates votes from signatory to `delegatee`
   * @param delegatee The address to delegate votes to
   * @param nonce The contract state required to match the signature
   * @param expiry The time at which to expire the signature
   * @param v The recovery byte of the signature
   * @param r Half of the ECDSA signature pair
   * @param s Half of the ECDSA signature pair
   */
  function delegateBySig(
    address delegatee,
    uint256 nonce,
    uint256 expiry,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external override {
    bytes32 structHash = keccak256(abi.encode(DELEGATION_TYPEHASH, delegatee, nonce, expiry));
    bytes32 digest = keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    address signatory = ecrecover(digest, v, r, s);
    require(signatory != address(0), "invalid signature");
    require(nonce == nonces[signatory]++, "invalid nonce");
    require(block.timestamp <= expiry, "signature expired");
    return _delegate(signatory, delegatee);
  }

/** ========== Internal Helpers ==========  */

  function _mint(address dst, uint256 rawAmount) internal virtual {
    require(dst != address(0), "mint to the zero address");
    uint96 amount = safe96(rawAmount);
    _totalSupply = add96(_totalSupply, amount, "mint amount overflows");
    balances[dst] += amount; // add96 not needed because totalSupply does not overflow
    emit Transfer(address(0), dst, amount);
    _moveDelegates(address(0), delegates[dst], amount);
  }

  function _burn(address src, uint256 rawAmount) internal virtual {
    require(src != address(0), "burn from the zero address");
    uint96 amount = safe96(rawAmount);
    balances[src] = sub96(balances[src], amount, "burn amount exceeds balance");
    _totalSupply -= amount; // add96 not needed because balance does not underflow
    emit Transfer(src, address(0), amount);
    _moveDelegates(delegates[src], address(0), amount);
  }

  function _delegate(address delegator, address delegatee) internal {
    address currentDelegate = delegates[delegator];
    uint96 delegatorBalance = balances[delegator];
    delegates[delegator] = delegatee;
    emit DelegateChanged(delegator, currentDelegate, delegatee);
    _moveDelegates(currentDelegate, delegatee, delegatorBalance);
  }

  function _transfer(
    address src,
    address dst,
    uint96 amount
  ) internal virtual {
    require(src != address(0), "transfer from the zero address");
    require(dst != address(0), "transfer to the zero address");

    balances[src] = sub96(balances[src], amount, "transfer amount exceeds balance");
    balances[dst] = add96(balances[dst], amount, "transfer amount overflows");
    emit Transfer(src, dst, amount);

    _moveDelegates(delegates[src], delegates[dst], amount);
  }

  function _moveDelegates(
    address srcRep,
    address dstRep,
    uint96 amount
  ) internal {
    if (srcRep != dstRep && amount > 0) {
      if (srcRep != address(0)) {
        uint32 srcRepNum = numCheckpoints[srcRep];
        uint96 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
        uint96 srcRepNew = sub96(srcRepOld, amount, "vote amount underflows");
        _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
      }

      if (dstRep != address(0)) {
        uint32 dstRepNum = numCheckpoints[dstRep];
        uint96 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
        uint96 dstRepNew = add96(dstRepOld, amount, "vote amount overflows");
        _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
      }
    }
  }

  function _writeCheckpoint(
    address delegatee,
    uint32 nCheckpoints,
    uint96 oldVotes,
    uint96 newVotes
  ) internal {
    uint32 blockNumber = safe32(block.number, "block number exceeds 32 bits");

    if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
      checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
    } else {
      checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
      numCheckpoints[delegatee] = nCheckpoints + 1;
    }

    emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
  }

  function safe32(uint256 n, string memory errorMessage) internal pure returns (uint32) {
    require(n < 2**32, errorMessage);
    return uint32(n);
  }

  function safe96(uint256 n) internal pure returns (uint96) {
    require(n < 2**96, "amount exceeds 96 bits");
    return uint96(n);
  }

  function add96(
    uint96 a,
    uint96 b,
    string memory errorMessage
  ) internal pure returns (uint96) {
    uint96 c = a + b;
    require(c >= a, errorMessage);
    return c;
  }

  function sub96(
    uint96 a,
    uint96 b,
    string memory errorMessage
  ) internal pure returns (uint96) {
    require(b <= a, errorMessage);
    return a - b;
  }

  function getChainId() internal pure returns (uint256) {
    uint256 chainId;
    assembly { chainId := chainid() }
    return chainId;
  }
}

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


interface IAbstractDividends {
	/**
	 * @dev Returns the total amount of dividends a given address is able to withdraw.
	 * @param account Address of a dividend recipient
	 * @return A uint256 representing the dividends `account` can withdraw
	 */
	function withdrawableDividendsOf(address account) external view returns (uint256);

  /**
	 * @dev View the amount of funds that an address has withdrawn.
	 * @param account The address of a token holder.
	 * @return The amount of funds that `account` has withdrawn.
	 */
	function withdrawnDividendsOf(address account) external view returns (uint256);

	/**
	 * @dev View the amount of funds that an address has earned in total.
	 * accumulativeFundsOf(account) = withdrawableDividendsOf(account) + withdrawnDividendsOf(account)
	 * = (pointsPerShare * balanceOf(account) + pointsCorrection[account]) / POINTS_MULTIPLIER
	 * @param account The address of a token holder.
	 * @return The amount of funds that `account` has earned in total.
	 */
	function cumulativeDividendsOf(address account) external view returns (uint256);

	/**
	 * @dev This event emits when new funds are distributed
	 * @param by the address of the sender who distributed funds
	 * @param dividendsDistributed the amount of funds received for distribution
	 */
	event DividendsDistributed(address indexed by, uint256 dividendsDistributed);

	/**
	 * @dev This event emits when distributed funds are withdrawn by a token holder.
	 * @param by the address of the receiver of funds
	 * @param fundsWithdrawn the amount of funds that were withdrawn
	 */
	event DividendsWithdrawn(address indexed by, uint256 fundsWithdrawn);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;


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

  function balanceOf(address account) external view returns (uint256);

  function transfer(address recipient, uint256 amount) external returns (bool);

  function allowance(address owner, address spender) external view returns (uint256);

  function approve(address spender, uint256 amount) external returns (bool);

  function transferFrom(
    address sender,
    address recipient,
    uint256 amount
  ) external returns (bool);

  event Transfer(address indexed from, address indexed to, uint256 value);

  event Approval(address indexed owner, address indexed spender, uint256 value);
}

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

import "./IERC20.sol";


interface IERC20VotesComp is IERC20 {
  event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

  event DelegateVotesChanged(address indexed delegate, uint256 previousBalance, uint256 newBalance);

  struct Checkpoint {
    uint32 fromBlock;
    uint96 votes;
  }

  function nonces(address) external view returns (uint256);

  function delegates(address) external view returns (address);

  function checkpoints(address, uint32) external view returns (uint32 fromBlock, uint96 votes);

  function numCheckpoints(address) external view returns (uint32);

  function getCurrentVotes(address account) external view returns (uint96);

  function getPriorVotes(address account, uint256 blockNumber) external view returns (uint96);

  function delegate(address delegatee) external;

  function delegateBySig(
    address delegatee,
    uint256 nonce,
    uint256 expiry,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;


interface IWETH {
  function deposit() external payable;
  function withdraw(uint) external;
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.7.0;

/************************************************************************************************
Originally from https://github.com/Uniswap/uniswap-v3-core/blob/main/contracts/libraries/LowGasSafeMath.sol

This source code has been modified from the original, which was copied from the github repository
at commit hash b83fcf497e895ae59b97c9d04e997023f69b5e97.

Subject to the GPL-2.0-or-later license
*************************************************************************************************/


/// @title Optimized overflow and underflow safe math operations
/// @notice Contains methods for doing math operations that revert on overflow or underflow for minimal gas cost
library LowGasSafeMath {
    /// @notice Returns x + y, reverts if sum overflows uint256
    /// @param x The augend
    /// @param y The addend
    /// @return z The sum of x and y
    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x + y) >= x);
    }

    /// @notice Returns x + y, reverts if sum overflows uint256
    /// @param x The augend
    /// @param y The addend
    /// @return z The sum of x and y
    function add(uint256 x, uint256 y, string memory errorMessage) internal pure returns (uint256 z) {
        require((z = x + y) >= x, errorMessage);
    }

    /// @notice Returns x - y, reverts if underflows
    /// @param x The minuend
    /// @param y The subtrahend
    /// @return z The difference of x and y
    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x - y) <= x);
    }

    /// @notice Returns x - y, reverts if underflows
    /// @param x The minuend
    /// @param y The subtrahend
    /// @return z The difference of x and y
    function sub(uint256 x, uint256 y, string memory errorMessage) internal pure returns (uint256 z) {
        require((z = x - y) <= x, errorMessage);
    }

    /// @notice Returns x * y, reverts if overflows
    /// @param x The multiplicand
    /// @param y The multiplier
    /// @return z The product of x and y
    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(x == 0 || (z = x * y) / x == y);
    }

    /// @notice Returns x * y, reverts if overflows
    /// @param x The multiplicand
    /// @param y The multiplier
    /// @return z The product of x and y
    function mul(uint256 x, uint256 y, string memory errorMessage) internal pure returns (uint256 z) {
        require(x == 0 || (z = x * y) / x == y, errorMessage);
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

/************************************************************************************************
Originally from https://github.com/Uniswap/uniswap-v3-core/blob/main/contracts/libraries/SafeCast.sol

This source code has been modified from the original, which was copied from the github repository
at commit hash b83fcf497e895ae59b97c9d04e997023f69b5e97.

Subject to the GPL-2.0-or-later license
*************************************************************************************************/


/// @title Safe casting methods
/// @notice Contains methods for safely casting between types
library SafeCast {
  /// @notice Cast a uint256 to a uint160, revert on overflow
  /// @param y The uint256 to be downcasted
  /// @return z The downcasted integer, now type uint160
  function toUint160(uint256 y) internal pure returns (uint160 z) {
    require((z = uint160(y)) == y);
  }

  /// @notice Cast a uint256 to a uint128, revert on overflow
  /// @param y The uint256 to be downcasted
  /// @return z The downcasted integer, now type uint128
  function toUint128(uint256 y) internal pure returns (uint128 z) {
    require((z = uint128(y)) == y);
  }

  /// @notice Cast a int256 to a int128, revert on overflow or underflow
  /// @param y The int256 to be downcasted
  /// @return z The downcasted integer, now type int128
  function toInt128(int256 y) internal pure returns (int128 z) {
    require((z = int128(y)) == y);
  }

  /// @notice Cast a uint256 to a int256, revert on overflow
  /// @param y The uint256 to be casted
  /// @return z The casted integer, now type int256
  function toInt256(uint256 y) internal pure returns (int256 z) {
    require(y < 2**255);
    z = int256(y);
  }

  /// @notice Cast an int256 to a uint256, revert on overflow
  /// @param y The uint256 to be downcasted
  /// @return z The downcasted integer, now type uint160
  function toUint256(int256 y) internal pure returns (uint256 z) {
    require(y >= 0);
    z = uint256(y);
  }
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.6.0;

import "../interfaces/IERC20.sol";
/************************************************************************************************
Originally from https://github.com/Uniswap/uniswap-v3-periphery/blob/main/contracts/libraries/TransferHelper.sol

This source code has been modified from the original, which was copied from the github repository
at commit hash 6a31c618fc3180a6ee945b869d1ce4449f253ee6.

Subject to the GPL-2.0-or-later license
*************************************************************************************************/


library TransferHelper {
  function safeTransferFrom(
    address token,
    address from,
    address to,
    uint256 value
  ) internal {
    (bool success, bytes memory data) =
      token.call(abi.encodeWithSelector(IERC20.transferFrom.selector, from, to, value));
    require(success && (data.length == 0 || abi.decode(data, (bool))), "STF");
  }

  function safeTransfer(
    address token,
    address to,
    uint256 value
  ) internal {
    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(IERC20.transfer.selector, to, value));
    require(success && (data.length == 0 || abi.decode(data, (bool))), "ST");
  }

  function safeTransferETH(address to, uint256 value) internal {
    (bool success, ) = to.call{value: value}(new bytes(0));
    require(success, "STE");
  }
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "none",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 800
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000144469766964656e642d42656172696e67204e44580000000000000000000000000000000000000000000000000000000000000000000000000000000000000004644e445800000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : weth_ (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
Arg [1] : name_ (string): Dividend-Bearing NDX
Arg [2] : symbol_ (string): dNDX

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000014
Arg [4] : 4469766964656e642d42656172696e67204e4458000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [6] : 644e445800000000000000000000000000000000000000000000000000000000