# Tạo lock contract

By [tonythanh2012](https://paragraph.com/@tonythanh) · 2023-04-18

---

    // SPDX-License-Identifier: UNLICENSED
    pragma solidity ^0.8.9;
    
    // Uncomment this line to use console.log
    // import "hardhat/console.sol";
    
    contract Lock {
        uint public unlockTime;
        address payable public owner;
    
        event Withdrawal(uint amount, uint when);
    
        constructor(uint _unlockTime) payable {
            require(
                block.timestamp < _unlockTime,
                "Unlock time should be in the future"
            );
    
            unlockTime = _unlockTime;
            owner = payable(msg.sender);
        }
    
        function withdraw() public {
            // Uncomment this line, and the import of "hardhat/console.sol", to print a log in your terminal
            // console.log("Unlock time is %o and block timestamp is %o", unlockTime, block.timestamp);
    
            require(block.timestamp >= unlockTime, "You can't withdraw yet");
            require(msg.sender == owner, "You aren't the owner");
    
            emit Withdrawal(address(this).balance, block.timestamp);
    
            owner.transfer(address(this).balance);
        }
    }

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*Originally published on [tonythanh2012](https://paragraph.com/@tonythanh/t-o-lock-contract)*