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// SPDX-License-Identifier: GPL-3.0 | |
pragma solidity ^0.8.4; | |
contract Purchase { | |
uint public value; | |
address payable public seller; | |
address payable public buyer; | |
uint256 public lastRun; | |
enum State { Created, Locked, Release, Inactive } | |
// The state variable has a default value of the first member, `State.created` |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.4; | |
import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; | |
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol"; | |
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol"; | |
import "@openzeppelin/contracts/access/Ownable.sol"; | |
import "@openzeppelin/contracts/utils/Counters.sol"; | |