Contract 0x38704381a48B137456f50b2c76892fa29d09DBEc

 
 
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0x74eca4eb702960c74592743ed7d9b8816de81b5eb448c3c9fc5436b0b2a568e9Randomness Reque...111031552021-09-21 8:41:0735 days 6 hrs ago0x160b751e748fbbbdb6720bc1051b40bd48247e6c IN  0x38704381a48b137456f50b2c76892fa29d09dbec0 BNB0.000765935
0x714ebd3babfddb3c02a557fdaceece7edcb7b44c270c90620e37c515b09a5466Randomness Reque...111030932021-09-21 8:38:0135 days 6 hrs ago0x160b751e748fbbbdb6720bc1051b40bd48247e6c IN  0x38704381a48b137456f50b2c76892fa29d09dbec0 BNB0.000765875
0x8b93af3c8720cab3eb677017cb29560a0fe62e71e750edc5b59348876b971fe5Randomness Reque...111030272021-09-21 8:34:4335 days 6 hrs ago0x160b751e748fbbbdb6720bc1051b40bd48247e6c IN  0x38704381a48b137456f50b2c76892fa29d09dbec0 BNB0.000765875
0x750ad585c1afff41124a317ae99a2641936a1dae6ca29eb63900816a9c8d46b3Randomness Reque...111029372021-09-21 8:30:1335 days 6 hrs ago0x160b751e748fbbbdb6720bc1051b40bd48247e6c IN  0x38704381a48b137456f50b2c76892fa29d09dbec0 BNB0.000765875
0x7ddcff7cd0afe127979ab229738f7be3f5341b5b0e6884deeb537191aad62836Randomness Reque...109670482021-09-16 14:49:0240 days 20 mins ago0x160b751e748fbbbdb6720bc1051b40bd48247e6c IN  0x38704381a48b137456f50b2c76892fa29d09dbec0 BNB0.000765995
0xed94ef00f91357d8ab72263672498192de6a20c4eeeca3a444e6cbc513ba3beeRandomness Reque...109667042021-09-16 14:31:5040 days 37 mins ago0x160b751e748fbbbdb6720bc1051b40bd48247e6c IN  0x38704381a48b137456f50b2c76892fa29d09dbec0 BNB0.000915935
0x0ae0459dbee30c021943e1e58368571de922ddb5cc082381042ac5672655cd180x60806040109666962021-09-16 14:31:2640 days 38 mins ago0x160b751e748fbbbdb6720bc1051b40bd48247e6c IN  Contract Creation0 BNB0.001500655
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Contract Source Code Verified (Exact Match)

Contract Name:
VrfOracleOraichainExample

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license
/**
 *Submitted for verification at BscScan.com on 2021-09-16
*/

/**
 *Submitted for verification at BscScan.com on 2021-09-12
*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.5.16;


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 Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    /**
     * @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].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

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);
}


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.
     *
     * _Available since v2.4.0._
     */
    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.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

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

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }

}

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));
    }

    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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "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");
        }
    }
}

interface IVRFOracleOraichain {
    function randomnessRequest(uint256 _seed, bytes calldata _data) external returns (bytes32 reqId);

    function fee() external returns (uint256);
}

contract VrfOracleOraichainExample {

    uint256 public  fee;


    address public orai;

    address public oracle;

    bytes32 public random;

    bytes32 public reqId;

    bytes32 public reqId2;
    constructor (address _oraiToken, address _oracle) public {
        fee = 0;
        orai = _oraiToken;
        oracle = _oracle;
    }

    function randomnessRequest(uint256 _seed) public {
        IERC20(orai).approve(oracle, IVRFOracleOraichain(oracle).fee());

        bytes memory data = abi.encode(address(this), this.fulfillRandomness.selector);

        reqId = IVRFOracleOraichain(oracle).randomnessRequest(_seed, data);
    }

    function fulfillRandomness(bytes32 _reqId, bytes32 _random) external {
        random = _random;
        reqId2 = _reqId;
    }

}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"_oraiToken","type":"address"},{"internalType":"address","name":"_oracle","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"constant":true,"inputs":[],"name":"fee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"_reqId","type":"bytes32"},{"internalType":"bytes32","name":"_random","type":"bytes32"}],"name":"fulfillRandomness","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"oracle","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"orai","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"random","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"_seed","type":"uint256"}],"name":"randomnessRequest","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"reqId","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"reqId2","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"}]

608060405234801561001057600080fd5b506040516104263803806104268339818101604052604081101561003357600080fd5b50805160209091015160008055600180546001600160a01b039384166001600160a01b031991821617909155600280549390921692169190911790556103a88061007e6000396000f3fe608060405234801561001057600080fd5b50600436106100885760003560e01c80637dc0d1d01161005b5780637dc0d1d0146100f85780638997ce4e14610100578063d8fa2f6a14610108578063ddca3f431461012557610088565b80630ffdd4e41461008d5780632ba8afb1146100b25780632e22873e146100d65780635ec01e4d146100f0575b600080fd5b6100b0600480360360408110156100a357600080fd5b508035906020013561012d565b005b6100ba610135565b604080516001600160a01b039092168252519081900360200190f35b6100de610144565b60408051918252519081900360200190f35b6100de61014a565b6100ba610150565b6100de61015f565b6100b06004803603602081101561011e57600080fd5b5035610165565b6100de61036d565b600355600555565b6001546001600160a01b031681565b60055481565b60035481565b6002546001600160a01b031681565b60045481565b6001546002546040805163ddca3f4360e01b815290516001600160a01b039384169363095ea7b3931691829163ddca3f43916004808201926020929091908290030181600087803b1580156101b957600080fd5b505af11580156101cd573d6000803e3d6000fd5b505050506040513d60208110156101e357600080fd5b5051604080516001600160e01b031960e086901b1681526001600160a01b03909316600484015260248301919091525160448083019260209291908290030181600087803b15801561023457600080fd5b505af1158015610248573d6000803e3d6000fd5b505050506040513d602081101561025e57600080fd5b505060408051306020808301919091526303ff753960e21b8284015282518083038401815260608301808552600254635e2fe29960e11b9091526064840186815260848501958652825160a4860152825192956001600160a01b039092169463bc5fc53294889488949260c4019185019080838360005b838110156102ed5781810151838201526020016102d5565b50505050905090810190601f16801561031a5780820380516001836020036101000a031916815260200191505b509350505050602060405180830381600087803b15801561033a57600080fd5b505af115801561034e573d6000803e3d6000fd5b505050506040513d602081101561036457600080fd5b50516004555050565b6000548156fea265627a7a72315820a9c4434aedea96e7c059ab5dbb61db5071ed6dbd79bbe6e58efd6699672f7f2764736f6c63430005100032000000000000000000000000a325ad6d9c92b55a3fc5ad7e412b1518f96441c00000000000000000000000001e19249980542e9bfbbabbb0d2e15f7bb114a90b

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

000000000000000000000000a325ad6d9c92b55a3fc5ad7e412b1518f96441c00000000000000000000000001e19249980542e9bfbbabbb0d2e15f7bb114a90b

-----Decoded View---------------
Arg [0] : _oraiToken (address): 0xa325ad6d9c92b55a3fc5ad7e412b1518f96441c0
Arg [1] : _oracle (address): 0x1e19249980542e9bfbbabbb0d2e15f7bb114a90b

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000a325ad6d9c92b55a3fc5ad7e412b1518f96441c0
Arg [1] : 0000000000000000000000001e19249980542e9bfbbabbb0d2e15f7bb114a90b


Deployed ByteCode Sourcemap

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Swarm Source

bzzr://a9c4434aedea96e7c059ab5dbb61db5071ed6dbd79bbe6e58efd6699672f7f27
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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