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// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.6;

import "@openzeppelin/contracts/access/Ownable.sol";

// solhint-disable const-name-snakecase
// solhint-disable private-vars-leading-underscore
contract GovernanceToken is Ownable {
  /// @notice EIP-20 token name for this token
  string public constant name = "DeFiHelper Governance Token";

  /// @notice EIP-20 token symbol for this token
  string public constant symbol = "DFH";

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

  /// @notice Total number of tokens in circulation
  uint256 public totalSupply = 1_000_000_000e18; // 1 billion GovernanceToken

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

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

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

  /// @notice A checkpoint for marking number of votes from a given block
  struct Checkpoint {
    uint32 fromBlock;
    uint96 votes;
  }

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

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

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

  /// @notice 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)");

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

  /// @notice An event thats emitted when an account changes its delegate
  event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

  /// @notice An event thats emitted when a delegate account's vote balance changes
  event DelegateVotesChanged(address indexed delegate, uint256 previousBalance, uint256 newBalance);

  /// @notice The standard EIP-20 transfer event
  event Transfer(address indexed from, address indexed to, uint256 amount);

  /// @notice The standard EIP-20 approval event
  event Approval(address indexed owner, address indexed spender, uint256 amount);

  /**
   * @notice Construct a new GovernanceToken token
   * @param account The initial account to grant all the tokens
   */
  constructor(address account) {
    balances[account] = uint96(totalSupply);
    emit Transfer(address(0), account, totalSupply);
  }

  /**
   * @notice Creates `amount` tokens and assigns them to `account`, increasing
   * the total supply.
   *
   * @param account Recipient of created token.
   * @param amount Amount of token to be created.
   */
  function mint(address account, uint256 amount) public onlyOwner {
    _mint(account, amount);
  }

  /**
   * @param account Owner of removed token.
   * @param amount Amount of token to be removed.
   */
  function burn(address account, uint256 amount) public onlyOwner {
    _burn(account, amount);
  }

  /**
   * @notice 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) external view returns (uint256) {
    return allowances[account][spender];
  }

  /**
   * @notice Approve `spender` to transfer up to `amount` from `src`
   * @dev 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 returns (bool) {
    uint96 amount;
    if (rawAmount == 2**256 - 1) {
      amount = 2**96 - 1;
    } else {
      amount = safe96(rawAmount, "GovernanceToken::approve: amount exceeds 96 bits");
    }

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

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

  /**
   * @notice 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) external view returns (uint256) {
    return balances[account];
  }

  /**
   * @notice 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 returns (bool) {
    uint96 amount = safe96(rawAmount, "GovernanceToken::transfer: amount exceeds 96 bits");
    _transferTokens(msg.sender, dst, amount);
    return true;
  }

  /**
   * @notice 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 returns (bool) {
    address spender = msg.sender;
    uint96 spenderAllowance = allowances[src][spender];
    uint96 amount = safe96(rawAmount, "GovernanceToken::approve: amount exceeds 96 bits");

    if (spender != src && spenderAllowance != 2**96 - 1) {
      uint96 newAllowance = sub96(
        spenderAllowance,
        amount,
        "GovernanceToken::transferFrom: transfer amount exceeds spender allowance"
      );
      allowances[src][spender] = newAllowance;

      emit Approval(src, spender, newAllowance);
    }

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

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

  /**
   * @notice 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
  ) public {
    bytes32 domainSeparator = keccak256(
      abi.encode(DOMAIN_TYPEHASH, keccak256(bytes(name)), getChainId(), address(this))
    );
    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), "GovernanceToken::delegateBySig: invalid signature");
    require(nonce == nonces[signatory]++, "GovernanceToken::delegateBySig: invalid nonce");
    // solhint-disable-next-line not-rely-on-time
    require(block.timestamp <= expiry, "GovernanceToken::delegateBySig: signature expired");
    return _delegate(signatory, delegatee);
  }

  /**
   * @notice 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 returns (uint96) {
    uint32 nCheckpoints = numCheckpoints[account];
    return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
  }

  /**
   * @notice Determine the prior number of votes for an account as of a block number
   * @dev 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) public view returns (uint96) {
    require(blockNumber < block.number, "GovernanceToken::getPriorVotes: 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;
  }

  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 _transferTokens(
    address src,
    address dst,
    uint96 amount
  ) internal {
    require(src != address(0), "GovernanceToken::_transferTokens: cannot transfer from the zero address");
    require(dst != address(0), "GovernanceToken::_transferTokens: cannot transfer to the zero address");

    balances[src] = sub96(balances[src], amount, "GovernanceToken::_transferTokens: transfer amount exceeds balance");
    balances[dst] = add96(balances[dst], amount, "GovernanceToken::_transferTokens: 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, "GovernanceToken::_moveVotes: 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, "GovernanceToken::_moveVotes: vote amount overflows");
        _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
      }
    }
  }

  function _writeCheckpoint(
    address delegatee,
    uint32 nCheckpoints,
    uint96 oldVotes,
    uint96 newVotes
  ) internal {
    uint32 blockNumber = safe32(block.number, "GovernanceToken::_writeCheckpoint: 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);
  }

  /** @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
     *
     * - `account` cannot be the zero address.
     */
  function _mint(address account, uint256 rawAmount) internal virtual {
    require(account != address(0), "GovernanceToken::_mint: mint to the zero address");
    uint96 amount = safe96(rawAmount, "GovernanceToken::_mint: amount exceeds 96 bits");

    totalSupply += amount;
    balances[account] = add96(balances[account], amount, "GovernanceToken::_mint: mint amount overflows");
    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 rawAmount) internal virtual {
    require(account != address(0), "GovernanceToken::_burn: burn from the zero address");
    uint96 amount = safe96(rawAmount, "GovernanceToken::_burn: amount exceeds 96 bits");

    balances[account] = sub96(balances[account], amount, "GovernanceToken::_burn: burn amount exceeds balance");
    totalSupply -= amount;
    emit Transfer(account, address(0), amount);
  }

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

  function safe96(uint256 n, string memory errorMessage) internal pure returns (uint96) {
    require(n < 2**96, errorMessage);
    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 view returns (uint256) {
    uint256 chainId;
    // solhint-disable-next-line no-inline-assembly
    assembly {
      chainId := chainid()
    }
    return chainId;
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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() {
        _setOwner(_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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

{
  "evmVersion": "berlin",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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000000000000000000000000bb73463b88b0cb9681f176d6d43a12c2fea2c237

-----Decoded View---------------
Arg [0] : account (address): 0xBB73463b88b0Cb9681f176d6D43a12C2FeA2c237

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000bb73463b88b0cb9681f176d6d43a12c2fea2c237