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Burn Remaining112188182020-11-08 20:03:041933 days ago1604865784IN
0x764973a1...86b0BC48c
0 ETH0.0005346420
Transfer112134072020-11-08 0:01:421934 days ago1604793702IN
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0.1 ETH0.0006650923.1
Transfer112133912020-11-07 23:57:101934 days ago1604793430IN
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8.30994738 ETH0.0012036819.8000016
Transfer112133832020-11-07 23:54:561934 days ago1604793296IN
0x764973a1...86b0BC48c
6.25 ETH0.0011368118.70000296
Transfer112133792020-11-07 23:54:061934 days ago1604793246IN
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6.25 ETH0.0011368118.7
Transfer112133732020-11-07 23:52:361934 days ago1604793156IN
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6.25 ETH0.0011368118.7
Transfer112133632020-11-07 23:49:391934 days ago1604792979IN
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6.25 ETH0.0011368118.7
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6.25 ETH0.0011368118.7
Transfer112133422020-11-07 23:45:401934 days ago1604792740IN
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6.25 ETH0.0012036819.8000016
Transfer112133352020-11-07 23:43:581934 days ago1604792638IN
0x764973a1...86b0BC48c
6.25 ETH0.0011434918.81
Transfer112133262020-11-07 23:42:381934 days ago1604792558IN
0x764973a1...86b0BC48c
6.25 ETH0.0012504920.57
Transfer112133192020-11-07 23:41:131934 days ago1604792473IN
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6.25 ETH0.0012504920.57
Transfer112133132020-11-07 23:39:391934 days ago1604792379IN
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6.25 ETH0.0012504920.57
Transfer112132972020-11-07 23:35:001934 days ago1604792100IN
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6.25 ETH0.0011368118.7
Transfer112132832020-11-07 23:33:501934 days ago1604792030IN
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6.25 ETH0.0011434918.81
Transfer112132692020-11-07 23:30:241934 days ago1604791824IN
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6.25 ETH0.0012036819.8
Transfer112132572020-11-07 23:28:141934 days ago1604791694IN
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6.25 ETH0.0013001721.3872117
Transfer112132292020-11-07 23:19:311934 days ago1604791171IN
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6.25 ETH0.0010766217.71
Transfer112132202020-11-07 23:18:141934 days ago1604791094IN
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6.25 ETH0.0011368118.7
Transfer112132092020-11-07 23:15:211934 days ago1604790921IN
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6.25 ETH0.0011368118.7
Transfer112131932020-11-07 23:12:451934 days ago1604790765IN
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6.25 ETH0.0011568719.03
Transfer112131792020-11-07 23:10:111934 days ago1604790611IN
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6.25 ETH0.0012036819.8000016
Transfer112131622020-11-07 23:07:561934 days ago1604790476IN
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6.25 ETH0.0012036819.8000016
Transfer112131512020-11-07 23:04:321934 days ago1604790272IN
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6.25 ETH0.0011368118.7000016
Transfer112131422020-11-07 23:02:541934 days ago1604790174IN
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6.25 ETH0.0011368118.7000016
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-112133912020-11-07 23:57:101934 days ago1604793430
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8.30994738 ETH
-112133832020-11-07 23:54:561934 days ago1604793296
0x764973a1...86b0BC48c
6.25 ETH
-112133792020-11-07 23:54:061934 days ago1604793246
0x764973a1...86b0BC48c
6.25 ETH
-112133732020-11-07 23:52:361934 days ago1604793156
0x764973a1...86b0BC48c
6.25 ETH
-112133632020-11-07 23:49:391934 days ago1604792979
0x764973a1...86b0BC48c
6.25 ETH
-112133532020-11-07 23:47:501934 days ago1604792870
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6.25 ETH
-112133422020-11-07 23:45:401934 days ago1604792740
0x764973a1...86b0BC48c
6.25 ETH
-112133352020-11-07 23:43:581934 days ago1604792638
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6.25 ETH
-112133262020-11-07 23:42:381934 days ago1604792558
0x764973a1...86b0BC48c
6.25 ETH
-112133192020-11-07 23:41:131934 days ago1604792473
0x764973a1...86b0BC48c
6.25 ETH
-112133132020-11-07 23:39:391934 days ago1604792379
0x764973a1...86b0BC48c
6.25 ETH
-112132972020-11-07 23:35:001934 days ago1604792100
0x764973a1...86b0BC48c
6.25 ETH
-112132832020-11-07 23:33:501934 days ago1604792030
0x764973a1...86b0BC48c
6.25 ETH
-112132692020-11-07 23:30:241934 days ago1604791824
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-112132572020-11-07 23:28:141934 days ago1604791694
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-112132292020-11-07 23:19:311934 days ago1604791171
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6.25 ETH
-112132202020-11-07 23:18:141934 days ago1604791094
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6.25 ETH
-112132092020-11-07 23:15:211934 days ago1604790921
0x764973a1...86b0BC48c
6.25 ETH
-112131932020-11-07 23:12:451934 days ago1604790765
0x764973a1...86b0BC48c
6.25 ETH
-112131792020-11-07 23:10:111934 days ago1604790611
0x764973a1...86b0BC48c
6.25 ETH
-112131622020-11-07 23:07:561934 days ago1604790476
0x764973a1...86b0BC48c
6.25 ETH
-112131512020-11-07 23:04:321934 days ago1604790272
0x764973a1...86b0BC48c
6.25 ETH
-112131422020-11-07 23:02:541934 days ago1604790174
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6.25 ETH
-112131412020-11-07 23:02:531934 days ago1604790173
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0.125 ETH
-112130852020-11-07 22:51:521934 days ago1604789512
0x764973a1...86b0BC48c
6.25 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
OhlayCrowdsale

Compiler Version
v0.7.4+commit.3f05b770

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license
/**
 *Submitted for verification at Etherscan.io on 2020-10-20
*/

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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/token/ERC20/IERC20.sol



pragma solidity ^0.7.0;

/**
 * @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/utils/Address.sol



pragma solidity ^0.7.0;

/**
 * @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) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

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

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

    /**
     * @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");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        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 ^0.7.0;




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



pragma solidity ^0.7.0;

/*
 * @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/utils/ReentrancyGuard.sol



pragma solidity ^0.7.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// File: contracts/token/IERC20Burnable.sol



pragma solidity ^0.7.0;


/**
 * @dev Interface of the ERC20Burnable.
 */
interface IERC20Burnable is IERC20 {

    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) external;
}

// File: contracts/crowdsale/OhlayCrowdsale.sol



pragma solidity ^0.7.0;






contract OhlayCrowdsale is ReentrancyGuard, Context {
    using SafeMath for uint256;
    using SafeERC20 for IERC20Burnable;

    IERC20Burnable private _token;

    address payable private _wallet;
    uint256 private _rate;
    uint256 private _weiRaised;
    uint256 private _openingTime;
    uint256 private _closingTime;

    uint256 public constant MIN_CONTRIBUTION = 0.1 ether;

    event TokensPurchased(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);

    constructor (
        uint256 rate,
        address payable wallet,
        IERC20Burnable token,
        uint256 openingTime,
        uint256 closingTime
    ) {
        require(rate > 0, "Crowdsale: rate is 0");
        require(wallet != address(0), "Crowdsale: wallet is the zero address");
        require(address(token) != address(0), "Crowdsale: token is the zero address");
        require(openingTime >= block.timestamp, "TimedCrowdsale: opening time is before current time"); // solhint-disable-line not-rely-on-time
        require(closingTime > openingTime, "TimedCrowdsale: opening time is not before closing time");

        _rate = rate;
        _wallet = wallet;
        _token = token;
        _openingTime = openingTime;
        _closingTime = closingTime;
    }

    receive() external payable {
        buyTokens(_msgSender());
    }

    function token() public view returns (IERC20Burnable) {
        return _token;
    }

    function wallet() public view returns (address payable) {
        return _wallet;
    }

    function rate() public view returns (uint256) {
        return _rate;
    }

    function weiRaised() public view returns (uint256) {
        return _weiRaised;
    }

    function openingTime() public view returns (uint256) {
        return _openingTime;
    }

    function closingTime() public view returns (uint256) {
        return _closingTime;
    }

    function isOpen() public view returns (bool) {
        // solhint-disable-next-line not-rely-on-time
        return block.timestamp >= _openingTime && block.timestamp <= _closingTime;
    }

    function hasClosed() public view returns (bool) {
        // solhint-disable-next-line not-rely-on-time
        return block.timestamp > _closingTime;
    }

    function buyTokens(address beneficiary) public nonReentrant payable {
        uint256 weiAmount = msg.value;

        _preValidatePurchase(beneficiary, weiAmount);

        uint256 tokens = _getTokenAmount(weiAmount);

        _weiRaised = _weiRaised.add(weiAmount);

        _processPurchase(beneficiary, tokens);

        emit TokensPurchased(_msgSender(), beneficiary, weiAmount, tokens);

        _forwardFunds();
    }

    function burnRemaining() public {
        require(hasClosed(), "OhlayCrowdsale: not closed");
        _token.burn(_token.balanceOf(address(this)));
    }

    function _preValidatePurchase(address beneficiary, uint256 weiAmount) internal view virtual {
        require(beneficiary != address(0), "Crowdsale: beneficiary is the zero address");
        require(isOpen(), "TimedCrowdsale: not open");
        require(weiAmount >= MIN_CONTRIBUTION, "OhlayCrowdsale: minimum amount is 0.1 ether");

        this;
    }

    function _deliverTokens(address beneficiary, uint256 tokenAmount) internal virtual {
        _token.safeTransfer(beneficiary, tokenAmount);
    }

    function _processPurchase(address beneficiary, uint256 tokenAmount) internal virtual {
        _deliverTokens(beneficiary, tokenAmount);
    }

    function _getTokenAmount(uint256 weiAmount) internal view virtual returns (uint256) {
        return weiAmount.mul(_rate);
    }

    function _forwardFunds() internal virtual {
        _wallet.transfer(msg.value);
    }
}

Contract Security Audit

Contract ABI

API
[{"inputs":[{"internalType":"uint256","name":"rate","type":"uint256"},{"internalType":"address payable","name":"wallet","type":"address"},{"internalType":"contract IERC20Burnable","name":"token","type":"address"},{"internalType":"uint256","name":"openingTime","type":"uint256"},{"internalType":"uint256","name":"closingTime","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"purchaser","type":"address"},{"indexed":true,"internalType":"address","name":"beneficiary","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"TokensPurchased","type":"event"},{"inputs":[],"name":"MIN_CONTRIBUTION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"burnRemaining","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"beneficiary","type":"address"}],"name":"buyTokens","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"closingTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"hasClosed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isOpen","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"openingTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"contract IERC20Burnable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"wallet","outputs":[{"internalType":"address payable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"weiRaised","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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Deployed Bytecode

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

0000000000000000000000000000000000000000000000000000000000013880000000000000000000000000eeb1f62ccfd1a3cc79547b7ea342f61dc2432d7800000000000000000000000008cae08246e9e47ab20db3d87375094b1ef3a533000000000000000000000000000000000000000000000000000000005f9dfa80000000000000000000000000000000000000000000000000000000005fa73500

-----Decoded View---------------
Arg [0] : rate (uint256): 80000
Arg [1] : wallet (address): 0xEeb1F62ccfD1A3cc79547b7eA342F61dC2432d78
Arg [2] : token (address): 0x08caE08246E9e47ab20db3D87375094B1Ef3A533
Arg [3] : openingTime (uint256): 1604188800
Arg [4] : closingTime (uint256): 1604793600

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000013880
Arg [1] : 000000000000000000000000eeb1f62ccfd1a3cc79547b7ea342f61dc2432d78
Arg [2] : 00000000000000000000000008cae08246e9e47ab20db3d87375094b1ef3a533
Arg [3] : 000000000000000000000000000000000000000000000000000000005f9dfa80
Arg [4] : 000000000000000000000000000000000000000000000000000000005fa73500


Deployed Bytecode Sourcemap

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Swarm Source

ipfs://061f636afa8316389321591ddb114e95075223e5e4a36a1281c8de7f4ad003d2

Block Uncle Number Difficulty Gas Used Reward
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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.