OpenZeppelin + Hardhat + VeChain

Getting started with the Contracts Wizard

OpenZeppelin is a wonderful platform with battle tested and audited contract libraries. OpenZeppelin offers a contract wizard that allows to build basic contracts.

Have a look at wizard.openzeppelin.com and let us build an example project from scratch.

Setup project from scratch using Hardhat

yarn init -y
yarn add --dev hardhat @nomiclabs/hardhat-waffle @nomiclabs/hardhat-ethers @vechain.energy/hardhat-thor @openzeppelin/contracts 
npx hardhat

✔ What do you want to do? · Create an empty hardhat.config.js
✨ Config file created ✨

Configure your contract

Visit https://wizard.openzeppelin.com/ and configure your contract. For this test I used the default ERC20 setting minting 2 tokens to myself.

The file is saved in contracts/MyToken.sol:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract MyToken is ERC20, Ownable {
    constructor() ERC20("MyToken", "MTK") {
        _mint(msg.sender, 2 * 10 ** decimals());
    }

    function mint(address to, uint256 amount) public onlyOwner {
        _mint(to, amount);
    }
}

Connect to VeChain-Network

Configure the network in hardhat.config.js:

require("@nomiclabs/hardhat-waffle");
require('@vechain.energy/hardhat-thor')

module.exports = {
 solidity: "0.8.4",
 defaultNetwork: "vechain",
 networks: {
    vechain: {
      url: 'https://testnet.veblocks.net',
      privateKey: "0x80b97e2ecfab8b1c78100c418328e8a88624e3d19928ec791a8a51cdcf01f16f",
      delegateUrl: 'https://sponsor-testnet.vechain.energy/by/90',
      blockGasLimit: 10000000
    }
  }
};

Deploy your contract

Write a script to deploy with hre.thor and interact with your new contract.

This goes to deploy.js:

const hre = require("hardhat");

async function main() {

  await hre.run('compile');
  const [deployer] = await hre.thor.getSigners()
  const deployerAddress = await deployer.getAddress()

  const MyToken = await hre.thor.getContractFactory("MyToken");
  const myToken = await MyToken.deploy();

  await myToken.deployed();
  console.log("MyToken deployed to:", myToken.address);

  const name = await myToken.name()
  const balance = await myToken.balanceOf(deployerAddress)
  console.log(`minted ${hre.ethers.utils.formatEther(balance)} of ${name} to myself at ${deployerAddress}`)
}

main()
  .then(() => process.exit(0))
  .catch((error) => {
    console.error(error);
    process.exit(1);
  });

And enjoy your result:

$ node deploy.js  
Compiled 6 Solidity files successfully
MyToken deployed to: 0xA103c3c0FdD137FAC67bCC2B90351731f96558b2
minted 2.0 of MyToken to myself at 0x7eF0CbaDFc0da51A6153F35a99185B59a8cbc463