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• interface IERC165
•    - function supportsInterface(bytes4 int ...
•    - function ifQualified (address account ...
•    - function logQualified (address accoun ...
•    - function supportsInterface(bytes4 int ...
•  contract QLF is IQLF *
•    - function get_name()
•    - function get_creation_time()
•    - function get_start_time()
•    - function set_start_time(uint256 _star ...
•    - function ifQualified(address)
•    - function logQualified(address account ...
•    - function supportsInterface(bytes4 int ...

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/**
 *Submitted for verification at Etherscan.io on 2021-04-27
*/

// Sources flattened with hardhat v2.2.0 https://hardhat.org
// File @openzeppelin/contracts/utils/introspection/[email protected]

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}


// File contracts/IQLF.sol


/**
 * @author          Yisi Liu
 * @contact         [email protected]
 * @author_time     01/06/2021
**/

pragma solidity >= 0.8.0;

abstract contract IQLF is IERC165 {
    /**
     * @dev Returns if the given address is qualified, implemented on demand.
     */
    function ifQualified (address account) virtual external view returns (bool);

    /**
     * @dev Logs if the given address is qualified, implemented on demand.
     */
    function logQualified (address account, uint256 ito_start_time) virtual external returns (bool);

    /**
     * @dev Ensure that custom contract implements `ifQualified` amd `logQualified` correctly.
     */
    function supportsInterface(bytes4 interfaceId) virtual external override pure returns (bool) {
        return interfaceId == this.supportsInterface.selector || 
            interfaceId == (this.ifQualified.selector ^ this.logQualified.selector);
    }

    /**
     * @dev Emit when `ifQualified` is called to decide if the given `address`
     * is `qualified` according to the preset rule by the contract creator and 
     * the current block `number` and the current block `timestamp`.
     */
    event Qualification(address account, bool qualified, uint256 blockNumber, uint256 timestamp);
}


// File contracts/qualification.sol


/**
 * @author          Yisi Liu
 * @contact         [email protected]
 * @author_time     01/06/2021
**/

pragma solidity >= 0.8.0;

contract QLF is IQLF {
    string private name;
    uint256 private creation_time;
    uint256 start_time;
    address creator;
    mapping(address => bool) black_list;

    modifier creatorOnly {
        require(msg.sender == creator, "Not Authorized");
        _;
    }

    constructor (string memory _name, uint256 _start_time) {
        name = _name;
        creation_time = block.timestamp;
        start_time = _start_time;
        creator = msg.sender;
    }

    function get_name() public view returns (string memory) {
        return name;
    }

    function get_creation_time() public view returns (uint256) {
        return creation_time;
    }

    function get_start_time() public view returns (uint256) {
        return start_time;
    }

    function set_start_time(uint256 _start_time) public creatorOnly {
        start_time = _start_time;
    }

    function ifQualified(address) public pure override returns (bool qualified) {
        qualified = true;
    } 

    function logQualified(address account, uint256 ito_start_time) public override returns (bool qualified) {
        if (start_time > block.timestamp || ito_start_time > block.timestamp) {
            black_list[address(msg.sender)] = true;
            return false;
        }
        if (black_list[msg.sender]) {
            return false;
        }
        emit Qualification(account, true, block.number, block.timestamp);
        return true;
    } 

    function supportsInterface(bytes4 interfaceId) external override pure returns (bool) {
        return interfaceId == this.supportsInterface.selector || 
            interfaceId == (this.ifQualified.selector ^ this.logQualified.selector) ||
            interfaceId == this.get_start_time.selector;
    }    
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"uint256","name":"_start_time","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"bool","name":"qualified","type":"bool"},{"indexed":false,"internalType":"uint256","name":"blockNumber","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"Qualification","type":"event"},{"inputs":[],"name":"get_creation_time","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"get_name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"get_start_time","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"ifQualified","outputs":[{"internalType":"bool","name":"qualified","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"ito_start_time","type":"uint256"}],"name":"logQualified","outputs":[{"internalType":"bool","name":"qualified","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_start_time","type":"uint256"}],"name":"set_start_time","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"}]

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00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000744454641554c5400000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _name (string): DEFAULT
Arg [1] : _start_time (uint256): 0

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [3] : 44454641554c5400000000000000000000000000000000000000000000000000

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ipfs://9900e0e967b6d7ae740e339416f52c286c09c35433b67fa662e7fca21a763a11