Deploy and Verify Contract on EVM with Foundry

This guide provides step-by-step instructions on manually deploying and verifying an ERC-20 contract on the Sepolia network using Foundry.

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Initial Setup

1. Install Foundry (if not installed): Foundry is the tool we will use to compile and deploy the contract.

   curl -L https://foundry.paradigm.xyz | bash
   foundryup
   

2. Install OpenZeppelin Contracts: To avoid errors when using the OpenZeppelin library, clone the OpenZeppelin Contracts repository into your project:

   git clone https://github.com/OpenZeppelin/openzeppelin-contracts.git lib/openzeppelin-contracts
   

3. Configure foundry.toml: Create a foundry.toml file in your project directory to set source and output locations and add the RPC endpoint for the Sepolia network:

   [profile.default]
   src = "src"
   out = "out"
   libs = ["lib"]
   
   [rpc_endpoints]
   unichain = "https://sepolia.unichain.org"
   

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1. Create the ERC-20 Contract

Create a Solidity file in the src/ directory named MyToken.sol for your ERC-20 contract, and use the following template:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

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

contract MyToken is ERC20 {
    constructor() ERC20("MyToken", "MTK") {
        _mint(msg.sender, 100000 * (10 ** decimals()));
    }
}

• Token Name: "MyToken"
• Token Symbol: "MTK"
• Mint Amount: 100,000 tokens

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2. Compile the Contract

After writing your contract code, compile it with the following command:

forge build

If there are no errors, the contract is compiled, and you can proceed to the deployment step.

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3. Deploy the Contract

To deploy the contract on the Sepolia network, use this command:

forge create src/MyToken.sol:MyToken --rpc-url https://sepolia.unichain.org --private-key <PRIVATE_KEY>

Replace <PRIVATE_KEY> with your wallet's private key.

• If deployment is successful, you will see the address of the newly deployed contract. Copy this address, as you will need it for verification.

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4. Verify the Contract

Once deployed, verify the contract on Etherscan. You can do this by using the Etherscan API:

1. Create an account on Etherscan and obtain an API key.

2. Run the following command to verify the contract:

   forge verify-contract <CONTRACT_ADDRESS> src/MyToken.sol:MyToken <ETHERSCAN_API_KEY> --chain-id 11155111
   

   Replace:

   • <CONTRACT_ADDRESS> with the deployed contract's address.
   • <ETHERSCAN_API_KEY> with your Etherscan API key.
   • --chain-id 11155111 with the chain ID for Sepolia.

If the verification is successful, your contract will appear as "Verified" on Sepolia Etherscan.

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By following these steps, you can manually deploy and verify an ERC-20 contract on the Sepolia network.