Contract 0x05448D7D10EEa17C6423C5D92Ae943365F2af8Ee

 

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0 ETH

ETH Value:
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0xf8170d0322cb7acaf1345f330e3c0c9ed61d70b5b4eb4f5c11fcfc5485be348722743472021-10-16 12:34:4010 hrs 41 mins ago0x137aad5ed61b0867d8c9e2585b65b01e282d4b0f IN  0x05448d7d10eea17c6423c5d92ae943365f2af8ee0 ETH0.000897959548 ETH
0x2f7243303b31b5e3001a736bf39020b89a47fe3122cec6703738549a1a7d6dfa22553202021-10-15 17:44:431 day 5 hrs ago0x137aad5ed61b0867d8c9e2585b65b01e282d4b0f IN  0x05448d7d10eea17c6423c5d92ae943365f2af8ee0 ETH0.00100912437 ETH
0x82c7d580ae704dcd6084ea4f0e36779f8ae729a3fed0803e405f1fed2ea89d1022295972021-10-15 0:38:581 day 22 hrs ago0x137aad5ed61b0867d8c9e2585b65b01e282d4b0f IN  0x05448d7d10eea17c6423c5d92ae943365f2af8ee0 ETH0.000961752158 ETH
0x54e7bcd7c0866314bc5191ee46ee1236f46f60ed2d938115e9dff2fbe67a8eeb22157482021-10-14 13:44:332 days 9 hrs ago0x137aad5ed61b0867d8c9e2585b65b01e282d4b0f IN  0x05448d7d10eea17c6423c5d92ae943365f2af8ee0 ETH0.00082793102 ETH
0xef14b7b3a1eb9a2c3e8ad98bf1a28502e4b4f732197b4cd81f18c9f1a514f1c522040902021-10-14 4:22:542 days 18 hrs ago0x137aad5ed61b0867d8c9e2585b65b01e282d4b0f IN  0x05448d7d10eea17c6423c5d92ae943365f2af8ee0 ETH0.000859440208 ETH
0xb33e362af24cd547f8ecc3dc77bae871549e3b4800e533c7c53a0853c69e441d21952892021-10-13 20:33:453 days 2 hrs ago0x137aad5ed61b0867d8c9e2585b65b01e282d4b0f IN  0x05448d7d10eea17c6423c5d92ae943365f2af8ee0 ETH0.002226900878 ETH
0x0bda0ae001b5b18f6578b7daa127c3ea8a3bc3fb0ca13ff2415cfcf6dfa86c3221840242021-10-13 12:53:523 days 10 hrs ago0xff8e06115afdb7a215d3b1fa37096c863e9922c0 IN  0x05448d7d10eea17c6423c5d92ae943365f2af8ee0 ETH0.00203493233 ETH
0xd87e00790f3876667003ed6790505f94663221d78f831e2de79127d342a01e6621799552021-10-13 9:36:323 days 13 hrs ago0x22bf1c9e733bc05c1ff0de3ebf9963ac1403a849 IN  0x05448d7d10eea17c6423c5d92ae943365f2af8ee0 ETH0.000556335829 ETH
0xde29b0a365e6fbded14b70b65fc7d922346c04fd21d55d9f0284568c3da6fbdd21797762021-10-13 9:27:453 days 13 hrs ago0x22bf1c9e733bc05c1ff0de3ebf9963ac1403a849 IN  Contract Creation0 ETH0.082141622826 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
PledgePool

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at arbiscan.io on 2021-10-13
*/

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// 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 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;
    }
}

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


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, 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;
    }
}

// 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);
    }

    /**
     * @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);
            }
        }
    }
}

// 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/PledgePool.sol


pragma solidity ^0.6.12;




interface IMasterChef {
    function pendingOre(uint256 _pid, address _user) external view returns (uint256);
    function getMultiplier(uint256 _from, uint256 _to) external view returns (uint256);
    function orePerBlock() external view returns (uint256);
    function totalAllocPoint() external view returns (uint256);
    function deposit(uint256 _pid, uint256 _amount) external;
    function withdraw(uint256 _pid, uint256 _amount) external;
    function poolInfo(uint256 _pid) external view returns (address,uint256,uint256,uint256);
}

interface ICertificate {
    function mint(address _to, uint256 _amount) external;
    function burn(address _account, uint256 _amount) external;
    function transferOwnership(address newOwner) external;
}



contract PledgePool is Ownable {

    using SafeERC20 for IERC20;
    using SafeMath for uint256;

    address public oretoken = 0x3Bf0880fd26E49c46d1A1e69ADb268889B4be840;

    address public masterChef = 0xf6cd30D352b1829053fD210C79bf0C6D33bd056c;
    
    uint256 public period = 3888000;

    address public certificate;

    address public token;

    uint256 public pid;

    address public taxAddress = 0xBDfDF5b9a0D476565B380674f68359399b60a352;

    uint256 public taxRadio = 50;

    struct PoolInfo {
        uint256 allocPoint;
        uint256 lastRewardBlock;
        uint256 accOrePerShare;
    }

    struct UserInfo {
        uint256 amount;
        uint256 rewardDebt;
        uint256 created_at;
    }

    PoolInfo public poolInfo;

    mapping (address => UserInfo) public userInfo; 

    event Deposit(address indexed user, uint256 amount);
    event Withdraw(address indexed user, uint256 amount);
    
    constructor(address _token, address _certificate, uint256 _pid) public 
    {
        token = _token;
        certificate = _certificate;
        pid = _pid;
        (,uint256 _allocPoint,,) = IMasterChef(masterChef).poolInfo(_pid);
        poolInfo.allocPoint = _allocPoint;
        IERC20(certificate).safeApprove(masterChef, 0);
        IERC20(certificate).safeApprove(masterChef, uint(-1));
    }

    function setPeriod(uint256 _period) public onlyOwner {
        period = _period;
    }

    function setPid(uint256 _pid) public onlyOwner {
        pid = _pid;
        (,uint256 _allocPoint,,) = IMasterChef(masterChef).poolInfo(pid);
        poolInfo.allocPoint = _allocPoint;
    }

    function setTax(address _address) public onlyOwner {
        require(_address != address(0), "MasterChef: taxAddress not 0");
        taxAddress = _address;
        
    }

    function setRadio(uint256 _radio) public onlyOwner {
        require(_radio < 1000, "MasterChef: taxRadio too big");
        taxRadio = _radio;
    }

    function mintCertificate(uint256 _amount) private{
        IERC20(token).safeTransferFrom(address(msg.sender), address(this), _amount);
        ICertificate(certificate).mint(address(this), _amount);
    }
    
    function burnCertificate(address _address, uint256 _amount) private{
        ICertificate(certificate).burn(address(this), _amount);
        IERC20(token).transfer(_address, _amount);
    }


    function updatePool() private {
        if (block.number <= poolInfo.lastRewardBlock) {
            return;
        }
        uint256 lpSupply = IERC20(token).balanceOf(address(this));
        if (lpSupply == 0) {
            poolInfo.lastRewardBlock = block.number;
            return;
        }
        (,uint256 _allocPoint,,) = IMasterChef(masterChef).poolInfo(pid);
        poolInfo.allocPoint = _allocPoint;
        uint256 multiplier = IMasterChef(masterChef).getMultiplier(poolInfo.lastRewardBlock, block.number);
        uint256 oreReward = multiplier.mul(IMasterChef(masterChef).orePerBlock()).mul(poolInfo.allocPoint).div(IMasterChef(masterChef).totalAllocPoint());
        IMasterChef(masterChef).deposit(pid, 0);
        poolInfo.accOrePerShare = poolInfo.accOrePerShare.add(oreReward.mul(1e12).div(lpSupply));
        poolInfo.lastRewardBlock = block.number;
    } 


    function pendingOre(address _user) external view returns (uint256) {
        UserInfo storage user = userInfo[_user];
        uint256 lpSupply = IERC20(token).balanceOf(address(this));
        uint256 accOrePerShare = poolInfo.accOrePerShare;
        if (block.number > poolInfo.lastRewardBlock && lpSupply != 0) {
            uint256 multiplier = IMasterChef(masterChef).getMultiplier(poolInfo.lastRewardBlock, block.number);
            uint256 oreReward = multiplier.mul(IMasterChef(masterChef).orePerBlock()).mul(poolInfo.allocPoint).div(IMasterChef(masterChef).totalAllocPoint());
            accOrePerShare = accOrePerShare.add(oreReward.mul(1e12).div(lpSupply));
        }
        return user.amount.mul(accOrePerShare).div(1e12).sub(user.rewardDebt);
    }


    function deposit(uint256 _amount) public {
        UserInfo storage user = userInfo[msg.sender];
        updatePool();
        if (user.amount > 0) {
            uint256 pending = user.amount.mul(poolInfo.accOrePerShare).div(1e12).sub(user.rewardDebt);
            safeAppleTransfer(msg.sender, pending);
        }
        mintCertificate(_amount);
        IMasterChef(masterChef).deposit(pid, _amount);
        user.amount = user.amount.add(_amount);
        user.rewardDebt = user.amount.mul(poolInfo.accOrePerShare).div(1e12);
        user.created_at = block.timestamp;
        updatePool();
        emit Deposit(msg.sender, _amount);
    }


    function withdraw(uint256 _amount) public {
        UserInfo storage user = userInfo[msg.sender];
        require(user.amount >= _amount, "withdraw: not good");
        updatePool();
        uint256 pending = user.amount.mul(poolInfo.accOrePerShare).div(1e12).sub(user.rewardDebt);
        IMasterChef(masterChef).withdraw(pid, _amount);
        safeAppleTransfer(msg.sender, pending);
        user.amount = user.amount.sub(_amount);
        user.rewardDebt = user.amount.mul(poolInfo.accOrePerShare).div(1e12);
        uint256 time = block.timestamp;
        if(time.sub(user.created_at) < period && taxRadio > 0){
            burnCertificate(taxAddress, _amount.mul(taxRadio).div(1000));
            burnCertificate(msg.sender, _amount.mul(1000 - taxRadio).div(1000));
        }else{
            burnCertificate(msg.sender, _amount);
        }
        emit Withdraw(msg.sender, _amount);
    }


    function emergencyWithdraw() public {
        UserInfo storage user = userInfo[msg.sender];
        uint256 time = block.timestamp;
        if(time.sub(user.created_at) < period && taxRadio > 0){
            safeAppleTransfer(taxAddress,user.amount.mul(taxRadio).div(1000));
            safeAppleTransfer(msg.sender,user.amount.mul(1000 - taxRadio).div(1000));
        }else{
            safeAppleTransfer(msg.sender, user.amount);
        }
        user.amount = 0;
        user.rewardDebt = 0;
    }

    function safeAppleTransfer(address _to, uint256 _amount) internal {
        uint256 oreBal = IERC20(oretoken).balanceOf(address(this));
        if (_amount > oreBal) {
            IERC20(oretoken).transfer(_to, oreBal);
        }else{
            IERC20(oretoken).transfer(_to, _amount);
        }
    }

}

Contract ABI

[{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_certificate","type":"address"},{"internalType":"uint256","name":"_pid","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Deposit","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":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[],"name":"certificate","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"emergencyWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"masterChef","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"oretoken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"}],"name":"pendingOre","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"period","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pid","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"poolInfo","outputs":[{"internalType":"uint256","name":"allocPoint","type":"uint256"},{"internalType":"uint256","name":"lastRewardBlock","type":"uint256"},{"internalType":"uint256","name":"accOrePerShare","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_period","type":"uint256"}],"name":"setPeriod","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"}],"name":"setPid","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_radio","type":"uint256"}],"name":"setRadio","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_address","type":"address"}],"name":"setTax","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"taxAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"taxRadio","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userInfo","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"rewardDebt","type":"uint256"},{"internalType":"uint256","name":"created_at","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

000000000000000000000000874a86E9E78D123ABb745CAE5e97369d79D41554000000000000000000000000C056515B9c13A5B232091eFB7367287D4C5E69bE000000000000000000000000000000000000000000000000000000000000003a

-----Decoded View---------------
Arg [0] : _token (address): 0x874a86e9e78d123abb745cae5e97369d79d41554
Arg [1] : _certificate (address): 0xc056515b9c13a5b232091efb7367287d4c5e69be
Arg [2] : _pid (uint256): 58

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000874a86E9E78D123ABb745CAE5e97369d79D41554
Arg [1] : 000000000000000000000000C056515B9c13A5B232091eFB7367287D4C5E69bE
Arg [2] : 000000000000000000000000000000000000000000000000000000000000003a


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://8c57682e4ec7a5cdac06b651cdf26c8f99f51644bbc79c8191f612e7aba4a6e2
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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