frankiefab100

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0 < 0.9.0;

/**
 * @title Certificate Proof of Existence Contract
 * @dev This PoE stores University Certificate document with time stamp as Hash values.
        The unique identifiers of the certificates are stored on the Ethereum Blockchain.
        It is publicly verifiable to prove their existence.
 *

frankiefab100

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.3;

import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

import "hardhat/console.sol";