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// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.9; 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 { 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); } }