Intro to VeChain

Set up Hardhat for VeChain

Configure Hardhat so you can build smart contracts for VeChain

Setting Up Your Hardhat Project

In this lesson, you’ll set up a Solidity development environment using Hardhat, and configure it to deploy contracts to VeChain’s testnet.

Create a `contracts/` directory

In your project root, create a folder to store your Solidity code and Hardhat files:

mkdir contracts
cd contracts

Install and Initialize Hardhat

npm install hardhat
npx hardhat init

Choose:

TypeScript project
Defaults for the rest

Update `hardhat.config.ts` for VeChain

Add these imports:

import { HardhatUserConfig } from "hardhat/config";
import { HttpNetworkConfig } from "hardhat/types";
import "@nomicfoundation/hardhat-ethers";
import "@vechain/sdk-hardhat-plugin";

Edit the config to include:

solidity: {
  version: "0.8.20",
  settings: {
    optimizer: { enabled: true, runs: 200 },
    evmVersion: "paris", // or "shanghai" if needed
  }
},
networks: {
  vechain_testnet: {
    url: "https://testnet.vechain.org",
    accounts: {
      mnemonic: "<YOUR_MNEMONIC>",
      path: "m/44'/818'/0'/0",
      count: 3,
      initialIndex: 0,
      passphrase: "vechainthor"
    },
    gas: "auto",
    gasPrice: "auto"
  }
}

What is <YOUR_MNEMONIC>?

This is the 12-word recovery phrase you get when creating your VeWorld wallet (or any other wallet). It grants Hardhat access to your testnet account, allowing it to sign and broadcast transactions.

Installation

Contract & Deployment Script

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Set up Hardhat for VeChain

Setting Up Your Hardhat Project

Create a contracts/ directory

Install and Initialize Hardhat

Update hardhat.config.ts for VeChain

Create a `contracts/` directory

Update `hardhat.config.ts` for VeChain