Deploy a contract

This guide will help you deploy a smart contract on Taiko.

Prerequisites

A wallet with some testnet ETH on Taiko (can receive this from the bridge).
The private key to the account with testnet ETH on Taiko.

Mainnet

Deploy a contract using Foundry

Install Foundry

Open a terminal and run the following commands to install Foundry:
Terminal window
```
curl -L https://foundry.paradigm.xyz | bash
foundryup
```

Create a project with Foundry

forge init hello_foundry && cd hello_foundry

Deploy your contract

Deploy the contract located at src/Counter.sol. Replace YOUR_PRIVATE_KEY below with your private key which has some testnet ETH on Taiko.
Terminal window
```
forge create src/Counter.sol:Counter \
--rpc-url https://rpc.mainnet.taiko.xyz \
--private-key YOUR_PRIVATE_KEY
```

Deploy a contract using Hardhat

Hardhat is an Ethereum development environment for deploying smart contracts, running tests, and debugging Solidity code locally. It is one of the popular smart contract development frameworks. This guide demonstrates deploying a Storage smart contract on Taiko using Hardhat, highlighting the compatibility of Ethereum contracts with Taiko.

Set up the environment Hardhat is a flexible Ethereum development environment designed for testing, compiling, and deploying smart contracts. It requires Node.js, npm, and Git to get started.

To effectively use Hardhat, your system must have Node.js (v10+ LTS) and npm installed.

If you are using Windows, we strongly recommend using WSL 2 to follow this guide.
Create a Hardhat project
- In your desired directory, run
Terminal window
```
mkdir hello-hardhat && cd hello-hardhat
```
- Initialize an npm project
Terminal window
```
npm init -y
```
- Install dotenv for environment variable management
Terminal window
```
npm install dotenv
```
- Add Hardhat to your project
Terminal window
```
npm install --save-dev hardhat
```
- Initialize Hardhat
Terminal window
```
npx hardhat init
```
Choose Create a JavaScript project and follow the prompts, agreeing to create a .gitignore and install suggested dependencies.

Configure Your Project

Delete Lock.sol in the /contracts directory.
In your project’s /contracts directory, create a new file named Storage.sol and paste the provided Solidity code into it using your text editor.

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.8.2 <0.9.0;

contract Storage {

    uint256 number;
    function store(uint256 num) public {
        number = num;
    }

    function retrieve() public view returns (uint256){
        return number;
    }
}

This contract, named Storage, includes functions to store and retrieve a uint256 number.

Create the /scripts to write a deployment script. Then create and open a new deploy.js file to insert the provided JavaScript code.
Proceed to the /scripts directory of your Hardhat project to write a deployment script. Then create and open a new deploy.js file to insert the provided JavaScript code.

const { ethers } = require("hardhat");

async function main() {
const StorageContract = await ethers.getContractFactory("Storage");
const storageContract = await StorageContract.deploy();

await storageContract.waitForDeployment();
const tx = await storageContract.deploymentTransaction();

console.log("Contract deployed successfully.");
console.log(`Deployer: ${storageContract.runner.address}`);
console.log(`Deployed to: ${storageContract.target}`);
console.log(`Transaction hash: ${tx.hash}`);
}

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

Populate the .env file. That is,
- Create a .env file within the root folder.
- Populate .env with your YOUR_PRIVATE_KEY and the Taiko’s RPC_URL as follows:

RPC_URL="https://rpc.mainnet.taiko.xyz"
YOUR_PRIVATE_KEY="<insert private key here>"

Update hardhat.config.js with the following configuration to include Taiko network settings and Solidity version.

require('dotenv').config();
require("@nomicfoundation/hardhat-toolbox");

module.exports = {
solidity: "0.8.20",
networks: {
    taiko: {
    url: process.env.RPC_URL,
    accounts: [process.env.YOUR_PRIVATE_KEY],
    }
}
};

Compile your contracts To compile your smart contracts, run
Terminal window
```
npx hardhat compile
```
Your compiled contracts will be located in the artifacts/ directory.
Deploy your contracts To deploy your contracts to Taiko network, use
Terminal window
```
npx hardhat run --network taiko scripts/deploy.js
```
Ensure you replace YOUR_PRIVATE_KEY with your actual private key that holds some testnet ETH on Taiko.

This command deploys your Storage contract to the Taiko. For additional details on deploying contracts with Hardhat, refer to the Deploying Contracts with Hardhat. The output on the terminal looks like as below.
Terminal window
```
Contract deployed successfully.
Deployer: 0xFdBA275E47....
Deployed to: 0x77De5f1e40....
Transaction hash: 0x75f219defa....
```
You can now check your deployed contract on any explorer found on our homepage using the deployed contract address.

Deploy a contract using thirdweb

Thirdweb offers a streamlined solution for deploying smart contracts to any EVM-compatible chain, including Taiko. By simplifying the deployment process, Thirdweb enables developers to focus on building without the hassle of managing private keys, RPC URLs, or deployment scripts. This guide demonstrates deploying a Lock smart contract on Taiko using Thirdweb, highlighting the compatibility of Ethereum contracts with Taiko.

Set up the environment

Before deploying a smart contract on Taiko with Thirdweb, ensure your contracts are ready in a folder or a Hardhat project. This setup can include a Hardhat project or any other structure where your contracts are organized.

For setup details, see our Hardhat Deployment guide on taiko.

Before proceeding further, it is required for you to set up your wallet. For guidance on this, please refer to the section Set up your wallet.
Deploying with Thirdweb
1. Initialize Your Project
  
  Navigate to your smart contract project’s root directory in the CLI and install Thirdweb globally using npm i -g thirdweb.
2. Deploy Your Contract
  
  Execute thirdweb deploy in the CLI. This command initiates the deployment process.
3. Authorize Your Device
  
  A browser window will prompt you to connect and authorize your wallet. This step ensures secure deployment from your chosen wallet.
4. Access the Deployment Link
  
  The CLI will provide a link. Open this link to proceed with deployment via the Thirdweb UI.
5. Complete Deployment Details
  - Fill in the necessary fields in the Thirdweb UI.
  - Select Taiko Network from the Chain drop-down menu.
  - Opt for Add to dashboard if you wish to manage this contract from the Thirdweb dashboard.
  - Click Deploy Now and sign the transaction in your connected wallet.
  For a more detailed documentation on deployments through Thirdweb using CLI, visit Thirdweb CLI Docs.
Managing Your Contract

After deployment, the Thirdweb dashboard allows you to manage and interact with your contract seamlessly. Deploying with Thirdweb not only streamlines the process but also enhances security by supporting browser-based wallets like MetaMask and others for deployment activities.

Hekla