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Contract

0x7BDD633aAb71cCFB348f3cf03392a63C093f311A
 

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0 ETH

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Token Holdings

Transaction Hash
Method
Block
From
To
Deposit173558092023-05-28 6:42:11542 days ago1685256131IN
0x7BDD633a...C093f311A
0 ETH0.0032179123.97352643
Deposit166602002023-02-19 4:14:59640 days ago1676780099IN
0x7BDD633a...C093f311A
0 ETH0.0023154921.85917379
Claim SAND166601982023-02-19 4:14:35640 days ago1676780075IN
0x7BDD633a...C093f311A
0 ETH0.002055920.21660297
Deposit164888952023-01-26 5:26:47664 days ago1674710807IN
0x7BDD633a...C093f311A
0 ETH0.0018491615.78752926
Deposit164512302023-01-20 23:14:35669 days ago1674256475IN
0x7BDD633a...C093f311A
0 ETH0.0046348430.6278308
Deposit164449202023-01-20 2:06:47670 days ago1674180407IN
0x7BDD633a...C093f311A
0 ETH0.0017409516.43526323
Deposit164019522023-01-14 2:07:59676 days ago1673662079IN
0x7BDD633a...C093f311A
0 ETH0.0043302128.61479058
Deposit163946782023-01-13 1:44:59677 days ago1673574299IN
0x7BDD633a...C093f311A
0 ETH0.0017748616.75536818
Deposit162220512022-12-19 23:33:35701 days ago1671492815IN
0x7BDD633a...C093f311A
0 ETH0.001672914.28270162
Claim SAND160839992022-11-30 16:29:35720 days ago1669825775IN
0x7BDD633a...C093f311A
0 ETH0.0010675814.54587598
Deposit160839982022-11-30 16:29:23720 days ago1669825763IN
0x7BDD633a...C093f311A
0 ETH0.0020708413.68446377
Deposit160723262022-11-29 1:19:35722 days ago1669684775IN
0x7BDD633a...C093f311A
0 ETH0.0015713211.70639287
Deposit160524112022-11-26 6:36:35725 days ago1669444595IN
0x7BDD633a...C093f311A
0 ETH0.0013553712.79524665
Claim SAND160524032022-11-26 6:34:59725 days ago1669444499IN
0x7BDD633a...C093f311A
0 ETH0.0014187411.94286536
Deposit160429832022-11-24 22:59:59726 days ago1669330799IN
0x7BDD633a...C093f311A
0 ETH0.0011446710.8061919
Deposit159833802022-11-16 15:08:11734 days ago1668611291IN
0x7BDD633a...C093f311A
0 ETH0.0017150316.19054629
Deposit159777342022-11-15 20:11:59735 days ago1668543119IN
0x7BDD633a...C093f311A
0 ETH0.0025624821.87761302
Deposit159505132022-11-12 1:00:23739 days ago1668214823IN
0x7BDD633a...C093f311A
0 ETH0.0024931317.23598633
Deposit159137212022-11-06 21:39:23744 days ago1667770763IN
0x7BDD633a...C093f311A
0 ETH0.0015429614.56612316
Deposit159004902022-11-05 1:19:11746 days ago1667611151IN
0x7BDD633a...C093f311A
0 ETH0.0022991815.19339902
Deposit159004202022-11-05 1:05:11746 days ago1667610311IN
0x7BDD633a...C093f311A
0 ETH0.001883716.34850705
Deposit159004062022-11-05 1:02:23746 days ago1667610143IN
0x7BDD633a...C093f311A
0 ETH0.0022727616.83178385
Deposit158998832022-11-04 23:17:23746 days ago1667603843IN
0x7BDD633a...C093f311A
0 ETH0.0018131214.09744381
Deposit158970452022-11-04 13:47:35746 days ago1667569655IN
0x7BDD633a...C093f311A
0 ETH0.0040644131.60164125
Deposit158879872022-11-03 7:24:11748 days ago1667460251IN
0x7BDD633a...C093f311A
0 ETH0.0023971118.63805441
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Contract Source Code Verified (Exact Match)

Contract Name:
MasterChefSAND

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2021-09-23
*/

// SPDX-License-Identifier: MIT

pragma solidity =0.6.12;


// 
/*
 * @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;
    }
}

//

// 
/**
 * @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);
}

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

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

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

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

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

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

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

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

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

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

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

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

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

// 
/**
 * @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);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(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);
            }
        }
    }
}

// 
/**
 * @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 virtual returns (address) {
        return _owner;
    }

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

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

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

// 
/**
 * @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");
        }
    }
}

// MasterChef is the master of VEMP. He can make VEMP and he is a fair guy.
//
// Note that it's ownable and the owner wields tremendous power. The ownership
// will be transferred to a governance smart contract once VEMP is sufficiently
// distributed and the community can show to govern itself.
//
// Have fun reading it. Hopefully it's bug-free. God bless.
contract MasterChefSAND is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    // Info of each user.
    struct UserInfo {
        uint256 amount;     // How many LP tokens the user has provided.
        uint256 rewardDebt; // Reward debt. See explanation below.
        uint256 rewardSANDDebt; // Reward debt in SAND.
        //
        // We do some fancy math here. Basically, any point in time, the amount of VEMPs
        // entitled to a user but is pending to be distributed is:
        //
        //   pending reward = (user.amount * pool.accVEMPPerShare) - user.rewardDebt
        //
        // Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:
        //   1. The pool's `accVEMPPerShare` (and `lastRewardBlock`) gets updated.
        //   2. User receives the pending reward sent to his/her address.
        //   3. User's `amount` gets updated.
        //   4. User's `rewardDebt` gets updated.
    }

    // Info of each pool.
    struct PoolInfo {
        IERC20 lpToken;           // Address of LP token contract.
        uint256 allocPoint;       // How many allocation points assigned to this pool. VEMPs to distribute per block.
        uint256 lastRewardBlock;  // Last block number that VEMPs distribution occurs.
        uint256 accVEMPPerShare; // Accumulated VEMPs per share, times 1e12. See below.
        uint256 accSANDPerShare; // Accumulated SANDs per share, times 1e12. See below.
        uint256 lastTotalSANDReward; // last total rewards
        uint256 lastSANDRewardBalance; // last SAND rewards tokens
        uint256 totalSANDReward; // total SAND rewards tokens
    }

    // The VEMP TOKEN!
    IERC20 public VEMP;
    // admin address.
    address public adminaddr;
    // VEMP tokens created per block.
    uint256 public VEMPPerBlock;
    // Bonus muliplier for early VEMP makers.
    uint256 public constant BONUS_MULTIPLIER = 1;

    // Info of each pool.
    PoolInfo[] public poolInfo;
    // Info of each user that stakes LP tokens.
    mapping (uint256 => mapping (address => UserInfo)) public userInfo;
    // Total allocation poitns. Must be the sum of all allocation points in all pools.
    uint256 public totalAllocPoint = 0;
    // The block number when VEMP mining starts.
    uint256 public startBlock;
    // total SAND staked
    uint256 public totalSANDStaked;
    // total SAND used for purchase land
    uint256 public totalSANDUsedForPurchase = 0;

    event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);

    constructor(
        IERC20 _VEMP,
        address _adminaddr,
        uint256 _VEMPPerBlock,
        uint256 _startBlock
    ) public {
        VEMP = _VEMP;
        adminaddr = _adminaddr;
        VEMPPerBlock = _VEMPPerBlock;
        startBlock = _startBlock;
    }

    function poolLength() external view returns (uint256) {
        return poolInfo.length;
    }

    // Add a new lp to the pool. Can only be called by the owner.
    // XXX DO NOT add the same LP token more than once. Rewards will be messed up if you do.
    function add(uint256 _allocPoint, IERC20 _lpToken, bool _withUpdate) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }
        uint256 lastRewardBlock = block.number > startBlock ? block.number : startBlock;
        totalAllocPoint = totalAllocPoint.add(_allocPoint);
        poolInfo.push(PoolInfo({
            lpToken: _lpToken,
            allocPoint: _allocPoint,
            lastRewardBlock: lastRewardBlock,
            accVEMPPerShare: 0,
            accSANDPerShare: 0,
            lastTotalSANDReward: 0,
            lastSANDRewardBalance: 0,
            totalSANDReward: 0
        }));
    }

    // Update the given pool's VEMP allocation point. Can only be called by the owner.
    function set(uint256 _pid, uint256 _allocPoint, bool _withUpdate) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }
        totalAllocPoint = totalAllocPoint.sub(poolInfo[_pid].allocPoint).add(_allocPoint);
        poolInfo[_pid].allocPoint = _allocPoint;
    }
    
    // Return reward multiplier over the given _from to _to block.
    function getMultiplier(uint256 _from, uint256 _to) public pure returns (uint256) {
        if (_to >= _from) {
            return _to.sub(_from).mul(BONUS_MULTIPLIER);
        } else {
            return _from.sub(_to);
        }
    }

    // View function to see pending VEMPs on frontend.
    function pendingVEMP(uint256 _pid, address _user) external view returns (uint256) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 accVEMPPerShare = pool.accVEMPPerShare;
        uint256 lpSupply = totalSANDStaked;
        if (block.number > pool.lastRewardBlock && lpSupply != 0) {
            uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
            uint256 VEMPReward = multiplier.mul(VEMPPerBlock).mul(pool.allocPoint).div(totalAllocPoint);
            accVEMPPerShare = accVEMPPerShare.add(VEMPReward.mul(1e12).div(lpSupply));
        }
        return user.amount.mul(accVEMPPerShare).div(1e12).sub(user.rewardDebt);
    }
    
    // View function to see pending SANDs on frontend.
    function pendingSAND(uint256 _pid, address _user) external view returns (uint256) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 accSANDPerShare = pool.accSANDPerShare;
        uint256 lpSupply = totalSANDStaked;
        if (block.number > pool.lastRewardBlock && lpSupply != 0) {
            uint256 rewardBalance = pool.lpToken.balanceOf(address(this)).sub(totalSANDStaked.sub(totalSANDUsedForPurchase));
            uint256 _totalReward = rewardBalance.sub(pool.lastSANDRewardBalance);
            accSANDPerShare = accSANDPerShare.add(_totalReward.mul(1e12).div(lpSupply));
        }
        return user.amount.mul(accSANDPerShare).div(1e12).sub(user.rewardSANDDebt);
    }

    // Update reward vairables for all pools. Be careful of gas spending!
    function massUpdatePools() public {
        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            updatePool(pid);
        }
    }

    // Update reward variables of the given pool to be up-to-date.
    function updatePool(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        
        if (block.number <= pool.lastRewardBlock) {
            return;
        }
        uint256 rewardBalance = pool.lpToken.balanceOf(address(this)).sub(totalSANDStaked.sub(totalSANDUsedForPurchase));
        uint256 _totalReward = pool.totalSANDReward.add(rewardBalance.sub(pool.lastSANDRewardBalance));
        pool.lastSANDRewardBalance = rewardBalance;
        pool.totalSANDReward = _totalReward;
        
        uint256 lpSupply = totalSANDStaked;
        if (lpSupply == 0) {
            pool.lastRewardBlock = block.number;
            pool.accSANDPerShare = 0;
            pool.lastTotalSANDReward = 0;
            user.rewardSANDDebt = 0;
            pool.lastSANDRewardBalance = 0;
            pool.totalSANDReward = 0;
            return;
        }
        uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
        uint256 VEMPReward = multiplier.mul(VEMPPerBlock).mul(pool.allocPoint).div(totalAllocPoint);
        pool.accVEMPPerShare = pool.accVEMPPerShare.add(VEMPReward.mul(1e12).div(lpSupply));
        pool.lastRewardBlock = block.number;
        
        uint256 reward = _totalReward.sub(pool.lastTotalSANDReward);
        pool.accSANDPerShare = pool.accSANDPerShare.add(reward.mul(1e12).div(lpSupply));
        pool.lastTotalSANDReward = _totalReward;
    }

    // Deposit LP tokens to MasterChef for VEMP allocation.
    function deposit(uint256 _pid, uint256 _amount) public {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        updatePool(_pid);
        if (user.amount > 0) {
            uint256 pending = user.amount.mul(pool.accVEMPPerShare).div(1e12).sub(user.rewardDebt);
            safeVEMPTransfer(msg.sender, pending);
            
            uint256 SANDReward = user.amount.mul(pool.accSANDPerShare).div(1e12).sub(user.rewardSANDDebt);
            pool.lpToken.safeTransfer(msg.sender, SANDReward);
            pool.lastSANDRewardBalance = pool.lpToken.balanceOf(address(this)).sub(totalSANDStaked.sub(totalSANDUsedForPurchase));
        }
        pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
        totalSANDStaked = totalSANDStaked.add(_amount);
        user.amount = user.amount.add(_amount);
        user.rewardDebt = user.amount.mul(pool.accVEMPPerShare).div(1e12);
        user.rewardSANDDebt = user.amount.mul(pool.accSANDPerShare).div(1e12);
        emit Deposit(msg.sender, _pid, _amount);
    }
    
    // Earn SAND tokens to MasterChef.
    function claimSAND(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        updatePool(_pid);
        
        uint256 SANDReward = user.amount.mul(pool.accSANDPerShare).div(1e12).sub(user.rewardSANDDebt);
        pool.lpToken.safeTransfer(msg.sender, SANDReward);
        pool.lastSANDRewardBalance = pool.lpToken.balanceOf(address(this)).sub(totalSANDStaked.sub(totalSANDUsedForPurchase));
        
        user.rewardSANDDebt = user.amount.mul(pool.accSANDPerShare).div(1e12);
    }

    // Safe VEMP transfer function, just in case if rounding error causes pool to not have enough VEMPs.
    function safeVEMPTransfer(address _to, uint256 _amount) internal {
        uint256 VEMPBal = VEMP.balanceOf(address(this));
        if (_amount > VEMPBal) {
            VEMP.transfer(_to, VEMPBal);
        } else {
            VEMP.transfer(_to, _amount);
        }
    }
    
    // Safe SAND transfer function to admin.
    function accessSANDTokens(uint256 _pid, address _to, uint256 _amount) public {
        require(msg.sender == adminaddr, "sender must be admin address");
        require(totalSANDStaked.sub(totalSANDUsedForPurchase) >= _amount, "Amount must be less than staked SAND amount");
        PoolInfo storage pool = poolInfo[_pid];
        uint256 SANDBal = pool.lpToken.balanceOf(address(this));
        if (_amount > SANDBal) {
            pool.lpToken.transfer(_to, SANDBal);
            totalSANDUsedForPurchase = totalSANDUsedForPurchase.add(SANDBal);
        } else {
            pool.lpToken.transfer(_to, _amount);
            totalSANDUsedForPurchase = totalSANDUsedForPurchase.add(_amount);
        }
    }
    
    // Update Reward per block
    function updateRewardPerBlock(uint256 _newRewardPerBlock) public onlyOwner {
        massUpdatePools();
        VEMPPerBlock = _newRewardPerBlock;
    }

    // Update admin address by the previous admin.
    function admin(address _adminaddr) public {
        require(msg.sender == adminaddr, "admin: wut?");
        adminaddr = _adminaddr;
    }
}

Contract Security Audit

Contract ABI

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IERC20","name":"_VEMP","type":"address"},{"internalType":"address","name":"_adminaddr","type":"address"},{"internalType":"uint256","name":"_VEMPPerBlock","type":"uint256"},{"internalType":"uint256","name":"_startBlock","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"pid","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"pid","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"EmergencyWithdraw","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"pid","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[],"name":"BONUS_MULTIPLIER","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"VEMP","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"VEMPPerBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"accessSANDTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_allocPoint","type":"uint256"},{"internalType":"contract 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IERC20","name":"lpToken","type":"address"},{"internalType":"uint256","name":"allocPoint","type":"uint256"},{"internalType":"uint256","name":"lastRewardBlock","type":"uint256"},{"internalType":"uint256","name":"accVEMPPerShare","type":"uint256"},{"internalType":"uint256","name":"accSANDPerShare","type":"uint256"},{"internalType":"uint256","name":"lastTotalSANDReward","type":"uint256"},{"internalType":"uint256","name":"lastSANDRewardBalance","type":"uint256"},{"internalType":"uint256","name":"totalSANDReward","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"poolLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"uint256","name":"_allocPoint","type":"uint256"},{"internalType":"bool","name":"_withUpdate","type":"bool"}],"name":"set","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"startBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalAllocPoint","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSANDStaked","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSANDUsedForPurchase","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"}],"name":"updatePool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newRewardPerBlock","type":"uint256"}],"name":"updateRewardPerBlock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"address","name":"","type":"address"}],"name":"userInfo","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"rewardDebt","type":"uint256"},{"internalType":"uint256","name":"rewardSANDDebt","type":"uint256"}],"stateMutability":"view","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000cfeb09c3c5f0f78ad72166d55f9e6e9a60e96eec0000000000000000000000002f00df4f995451e0df337b91744006eb8892bfb100000000000000000000000000000000000000000000000014d1120d7b1600000000000000000000000000000000000000000000000000000000000000caad7d

-----Decoded View---------------
Arg [0] : _VEMP (address): 0xcFEB09C3c5F0f78aD72166D55f9e6E9A60e96eEC
Arg [1] : _adminaddr (address): 0x2f00dF4F995451e0DF337B91744006EB8892bfB1
Arg [2] : _VEMPPerBlock (uint256): 1500000000000000000
Arg [3] : _startBlock (uint256): 13282685

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000cfeb09c3c5f0f78ad72166d55f9e6e9a60e96eec
Arg [1] : 0000000000000000000000002f00df4f995451e0df337b91744006eb8892bfb1
Arg [2] : 00000000000000000000000000000000000000000000000014d1120d7b160000
Arg [3] : 0000000000000000000000000000000000000000000000000000000000caad7d


Deployed Bytecode Sourcemap

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Swarm Source

ipfs://137e9fbfe9b42c70041d2866d9df187f2df1409a18f4035dda8d18274314d34a

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.