Contract 0x178a256886db96070a71d189af365514f62b5ff6

 
 
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0x88c1d01762fa06c5fd2cb073074967b245000f8cf989c37a55c585d865c08d6fWithdraw110150792021-09-18 6:54:227 days 9 hrs ago0x72d940fbff2314aeba633677e4d1a703e2e5d30b IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00038556
0xa1a2b30933de4ea0746b8e33d70ee052d7b1b759490034e7bf535208a27232b6Withdraw109608742021-09-16 9:39:109 days 6 hrs ago0xb229afcdc23a48a9bc9671f6451cb7b7b0f053aa IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00048156
0x0676f25e0989c75f8bb6a4bada9e6348306f5afe9d2752f7c1b3e64e53efc87cWithdraw109254522021-09-15 4:00:4710 days 12 hrs ago0x0696cca4f346552e2a8b822ce9afa50413976a0f IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.000569184
0x7707f9e0222bacb5fa0bdcb5dc2ae739b42bb4ef1f9519725b962b4477f16058Withdraw108960312021-09-14 3:26:1411 days 12 hrs ago0xc784bb6f6252a68a34184a650747bfe3d96893a8 IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00040656
0x72455fc042e2b4e5759bcdc3ba0ed01bd16117615cb5170b098c63d9afcd6e9aWithdraw107997592021-09-10 18:50:2214 days 21 hrs ago0x2107735355c48d6ee1ae668b6a659b11dd5e62e3 IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00040656
0x88150922ce20de4de15e1db91726f8b9b6ff806bcffb64e96cadffad9af722a3Withdraw106670742021-09-06 2:51:2419 days 13 hrs ago0xc41919bf3409e5252950ebf811e26701bbd6397a IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.0004065
0x46205e25a4b91a9fe523f745752d9028bbf7e0003237c89d002ed250cdeebc80Withdraw106384122021-09-05 2:55:3920 days 13 hrs ago0xf224f2b1d1e38a82bc9a0b159bab2c858b19d4e8 IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.0004065
0xc146b7cbf6cb64ec652b992d601882d83837e33a4223f0c8581fb1ae396d43bbWithdraw106122052021-09-04 4:58:5621 days 11 hrs ago0xe1e16db06483f5f66d8f1d7dfc18fa6869f1dc1c IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.0004065
0xf746ab10ec7926bdcfcb97db4d4954a5a2eeee2519fd39522b7d65d07e328fc0Withdraw105519482021-09-02 2:13:2623 days 14 hrs ago0x33e5d94ad55ff8971bff544d1ea17804bb47a264 IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00040656
0x57bd51b1d9b93ddd2ddfbf37f10d0c87b839b75e525b09e5dabe9feb9884963bWithdraw105453162021-09-01 20:37:2723 days 19 hrs ago0x03b02613ccc038afeba7deb07ffc4c296f7377e3 IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00040656
0x74288554327ea54043d64ed90a03fb287634557bd93b54124af7b9d6576f78f9Withdraw104599472021-08-29 20:22:0726 days 19 hrs ago0xeeab5fb158a37716585d2d66d22cf4aa340c5e56 IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00040656
0xf2e5241692951f8b4b6c37fd542228d6e982a4231c28b29d0588f39107400fadWithdraw104037832021-08-27 21:12:0528 days 19 hrs ago0x2436f979a1382b800ab76158e2b14605c7649aaa IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00048156
0x2e2f8a7cd5a4b6fa89935d201e4cc98bb995124e6f0586e332b3fa5e027e901bWithdraw103962172021-08-27 14:40:4229 days 1 hr ago0x617499939d9775abab117b3d57d110aa20bdefab IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.0004815
0xe3539fd804a4571df9bfb4cff9d926fec327651ce4905c81a2a2164df7ec2e33Withdraw103464062021-08-25 20:22:1330 days 19 hrs ago0x30d2066dbe6cb48d840b4a235139d1e8e105da19 IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.000487872
0x7e0ac7152717c8135501870ff590a48504241951255cf372acff57c8dbbb999dWithdraw103301082021-08-25 6:46:3931 days 9 hrs ago0x274bb35a3f71f479913968321dedbd79b3b6dc09 IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00040656
0x3821f93bc6a68f98120d6af808e526d99c0decca81cc7e9b453d1298cda24683Withdraw102916362021-08-23 22:33:4132 days 17 hrs ago0xbcf9808e95f17b771dead7dea0e8b6bbe022d4c6 IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.0004605
0x2c7df3a4d810fd618a04c38cc86dd3d99652d9c6a2c4984071569e6bd73a4238Withdraw102883582021-08-23 19:49:4732 days 20 hrs ago0xa306abe8962f47bba031276620bbe6705f2eaca1 IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.0004065
0x41361e4b686ff5286062d0c42d65fb9320fada1a99c914b500688e076b5666bcWithdraw102801762021-08-23 12:52:2333 days 3 hrs ago0x7203fbf23f4a5c509e1b7ad9bd130a2dd798088f IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00048156
0x2d37bf7a2d41828981da195169ca3c6c5baed55ed1fc1db93a23047db0946317Withdraw102706102021-08-23 4:51:4833 days 11 hrs ago0xd257c4d7ffb737295e3c608277046d170b3b153d IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00048156
0xc750f461b05ac228ce7648cb6e27c85820933bfcd5de859bf427756d386b8a8fWithdraw102622772021-08-22 21:55:0633 days 18 hrs ago0x336c81621822bab3f07c55530daa60e2faa2e70d IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00048156
0x76bc6013995534ef846c0046716d8afec060fe116ca2cbc0b3de0f5fa04fb3f8Withdraw102485332021-08-22 10:26:4934 days 5 hrs ago0xe9de2a0b834ecdb9c8cb3ac177f5183e57fe95a2 IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00040656
0x631b0c094fb4ea0548e16bc8699d28f6c04a9c8e21f2e724cf9d1b5856cc8d16Withdraw101968652021-08-20 15:02:1336 days 1 hr ago0x9c9d5b739b53e28934ebfe215b973daeddc69e0b IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00040656
0x2996528910536a16cda32ed28e79a15b2cbc7d4c21b780bc563e16ee190abb88Withdraw101967912021-08-20 14:58:2636 days 1 hr ago0x8e6a19891a7fb3ee9ffb6e59c7004c4426af517a IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.00038556
0x3470348c34df3e8a8ef21aa0b325696d902223d852c56bdd18a8d3ac21b0d05eWithdraw101819272021-08-20 2:29:4536 days 13 hrs ago0x41c62bcf371ed43d85b89d5641c2ddade73faecd IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.000487872
0xea505a95bf5f8cfdd93ff831fe66f2ba00043ee396e234cc6bb91335b540082fWithdraw101796562021-08-20 0:36:1236 days 15 hrs ago0x5fbc2d71646936dcc2e9af3cd7e2ae20bf8e9f99 IN  0x178a256886db96070a71d189af365514f62b5ff60 BNB0.0004065
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Contract Source Code Verified (Similar Match)
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x788FEf04480fb0Db7402EF3b74BB062136d9Fd98

Contract Name:
Boardroom

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2021-06-18
*/

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/math/SafeMath.sol


pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, 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) {
        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: @openzeppelin/contracts/utils/Address.sol


pragma solidity >=0.6.2 <0.8.0;

/**
 * @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) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @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");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol


pragma solidity >=0.6.0 <0.8.0;




/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: contracts/lib/Safe112.sol

pragma solidity ^0.6.0;

library Safe112 {
    function add(uint112 a, uint112 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, 'Safe112: addition overflow');

        return c;
    }

    function sub(uint112 a, uint112 b) internal pure returns (uint256) {
        return sub(a, b, 'Safe112: subtraction overflow');
    }

    function sub(
        uint112 a,
        uint112 b,
        string memory errorMessage
    ) internal pure returns (uint112) {
        require(b <= a, errorMessage);
        uint112 c = a - b;

        return c;
    }

    function mul(uint112 a, uint112 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, 'Safe112: multiplication overflow');

        return c;
    }

    function div(uint112 a, uint112 b) internal pure returns (uint256) {
        return div(a, b, 'Safe112: division by zero');
    }

    function div(
        uint112 a,
        uint112 b,
        string memory errorMessage
    ) internal pure returns (uint112) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint112 c = a / b;

        return c;
    }

    function mod(uint112 a, uint112 b) internal pure returns (uint256) {
        return mod(a, b, 'Safe112: modulo by zero');
    }

    function mod(
        uint112 a,
        uint112 b,
        string memory errorMessage
    ) internal pure returns (uint112) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/GSN/Context.sol


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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


pragma solidity >=0.6.0 <0.8.0;

/**
 * @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 () internal {
        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/owner/Operator.sol

pragma solidity ^0.6.0;



contract Operator is Context, Ownable {
    address private _operator;

    event OperatorTransferred(
        address indexed previousOperator,
        address indexed newOperator
    );

    constructor() internal {
        _operator = _msgSender();
        emit OperatorTransferred(address(0), _operator);
    }

    function operator() public view returns (address) {
        return _operator;
    }

    modifier onlyOperator() {
        require(
            _operator == msg.sender,
            'operator: caller is not the operator'
        );
        _;
    }

    function isOperator() public view returns (bool) {
        return _msgSender() == _operator;
    }

    function transferOperator(address newOperator_) public onlyOwner {
        _transferOperator(newOperator_);
    }

    function _transferOperator(address newOperator_) internal {
        require(
            newOperator_ != address(0),
            'operator: zero address given for new operator'
        );
        emit OperatorTransferred(_operator, newOperator_);
        _operator = newOperator_;
    }
}

// File: contracts/utils/ContractGuard.sol

pragma solidity ^0.6.12;

contract ContractGuard {
    mapping(uint256 => mapping(address => bool)) private _status;

    function checkSameOriginReentranted() internal view returns (bool) {
        return _status[block.number][tx.origin];
    }

    function checkSameSenderReentranted() internal view returns (bool) {
        return _status[block.number][msg.sender];
    }

    modifier onlyOneBlock() {
        require(
            !checkSameOriginReentranted(),
            'ContractGuard: one block, one function'
        );
        require(
            !checkSameSenderReentranted(),
            'ContractGuard: one block, one function'
        );

        _;

        _status[block.number][tx.origin] = true;
        _status[block.number][msg.sender] = true;
    }
}

// File: contracts/interfaces/IBasisAsset.sol

pragma solidity ^0.6.0;

interface IBasisAsset {
    function mint(address recipient, uint256 amount) external returns (bool);

    function burn(uint256 amount) external;

    function burnFrom(address from, uint256 amount) external;

    function isOperator() external returns (bool);

    function operator() external view returns (address);
}

// File: contracts/Boardroom.sol

pragma solidity ^0.6.0;


contract ShareWrapper {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    IERC20 public share;

    uint256 private _totalSupply;
    mapping(address => uint256) private _balances;

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

    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    function stake(uint256 amount) public virtual {
        _totalSupply = _totalSupply.add(amount);
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        share.safeTransferFrom(msg.sender, address(this), amount);
    }

    function withdraw(uint256 amount) public virtual {
        uint256 directorShare = _balances[msg.sender];
        require(
            directorShare >= amount,
            'Boardroom: withdraw request greater than staked amount'
        );
        _totalSupply = _totalSupply.sub(amount);
        _balances[msg.sender] = directorShare.sub(amount);
        share.safeTransfer(msg.sender, amount);
    }
}

contract Boardroom is ShareWrapper, ContractGuard, Operator {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;
    using Safe112 for uint112;

    /* ========== DATA STRUCTURES ========== */

    struct Boardseat {
        uint256 lastSnapshotIndex;
    }

    struct BoardSnapshot {
        uint256 time;
        uint256 rewardReceived;
        uint256 rewardPerShare;
    }

    /* ========== STATE VARIABLES ========== */

    IERC20 public cash;
    uint256 public timeLock;

    mapping(address => Boardseat) private directors;
    BoardSnapshot[] private boardHistory;

    /* ========== CONSTRUCTOR ========== */

    constructor(IERC20 _cash, IERC20 _share) public {
        cash = _cash;
        share = _share;

        BoardSnapshot memory genesisSnapshot = BoardSnapshot({
            time: block.number,
            rewardReceived: 0,
            rewardPerShare: 0
        });
        boardHistory.push(genesisSnapshot);
    }

    /* ========== Modifiers =============== */
    modifier directorExists {
        require(
            balanceOf(msg.sender) > 0,
            'Boardroom: The director does not exist'
        );
        _;
    }

    /* ========== VIEW FUNCTIONS ========== */

    // =========== Snapshot getters

    function latestSnapshotIndex() public view returns (uint256) {
        return boardHistory.length.sub(1);
    }

    function getLatestSnapshot() internal view returns (BoardSnapshot memory) {
        return boardHistory[latestSnapshotIndex()];
    }

    function getLastSnapshotIndexOf(address director)
        public
        view
        returns (uint256)
    {
        return directors[director].lastSnapshotIndex;
    }

    function getLastSnapshotOf(address director)
        internal
        view
        returns (BoardSnapshot memory)
    {
        return boardHistory[getLastSnapshotIndexOf(director)];
    }

    // =========== Director getters

    function rewardPerShare() public view returns (uint256) {
        return getLatestSnapshot().rewardPerShare;
    }

    function earned(address director) public view returns (uint256) {
        uint256 latestRPS = getLatestSnapshot().rewardPerShare;
        uint256 storedRPS = getLastSnapshotOf(director).rewardPerShare; 

        return
            balanceOf(director).mul(latestRPS.sub(storedRPS)).div(1e18);
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    function stake(uint256 amount)
        public
        override
        onlyOneBlock
    {
        require(amount > 0, 'Boardroom: Cannot stake 0');
        claimReward();
        super.stake(amount);
        emit Staked(msg.sender, amount);
    }

    function withdraw(uint256 amount)
        public
        override
        onlyOneBlock
        directorExists
    {
        require(amount > 0, 'Boardroom: Cannot withdraw 0');
        require(block.timestamp >= timeLock,"Boardroom: Withdraw Time Lockd");
        claimReward();
        super.withdraw(amount);
        emit Withdrawn(msg.sender, amount);
    }

    function claimReward() public {
        uint256 reward = earned(msg.sender);
        if (reward > 0) {
            cash.safeTransfer(msg.sender, reward);
            emit RewardPaid(msg.sender, reward);
        }
        directors[msg.sender].lastSnapshotIndex = latestSnapshotIndex();
    }

    function allocateSeigniorage(uint256 amount)
        external
        onlyOneBlock
        onlyOperator
    {
        require(amount > 0, 'Boardroom: Cannot allocate 0');
        require(
            totalSupply() > 0,
            'Boardroom: Cannot allocate when totalSupply is 0'
        );

        // Create & add new snapshot
        uint256 prevRPS = getLatestSnapshot().rewardPerShare;
        uint256 nextRPS = prevRPS.add(amount.mul(1e18).div(totalSupply()));

        BoardSnapshot memory newSnapshot = BoardSnapshot({
            time: block.number,
            rewardReceived: amount,
            rewardPerShare: nextRPS
        });
        boardHistory.push(newSnapshot);

        cash.safeTransferFrom(msg.sender, address(this), amount);
        emit RewardAdded(msg.sender, amount);
    }
    
    function burnReward() 
        external         
        onlyOneBlock
        onlyOperator 
    {
        for(uint256 i = 0;i<boardHistory.length;i++){
            boardHistory[i].rewardPerShare = 0;
        }
        IERC20 _cash = IERC20(cash);
        uint256 boardBalance = _cash.balanceOf(address(this));
        if (boardBalance > 0){
            // transfer treasury
            _cash.transfer(operator(),boardBalance);
        }
    }

    function setTimeLock(uint256 time) external onlyOperator {
        timeLock = time;
    }

    /* ========== EVENTS ========== */
    event Staked(address indexed user, uint256 amount);
    event Withdrawn(address indexed user, uint256 amount);
    event RewardPaid(address indexed user, uint256 reward);
    event RewardAdded(address indexed user, uint256 reward);
}

Contract Security Audit

Contract ABI

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Swarm Source

ipfs://5b78c599a1fefd0e6bc004561721c84a0ec807e18a6128a730caa6ca2b5145b5
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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