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Truffle

To verify your contracts, you can use Truffle's verification plugin truffle-plugin-verify.

These steps assume you stored your secret keys in a .env file, which you can read more about here.

Download the plugin​

In your Truffle project, install the plugin:

npm install -D truffle-plugin-verify

Add the plugin to the truffle-config.js file:

module.exports = {
  /* ... rest of truffle-config */

  plugins: ["truffle-plugin-verify"],
};

Add your Lineascan API Key​

Then, you'll need to get an Lineascan (Linea instance of Etherscan) key by creating an account at https://lineascan.build/myapikey. Grab your key, and add it to the .env file:

MNEMONIC=YOUR_MNEMONIC_HERE
LINEASCAN_API_KEY=YOUR_API_KEY_HERE

Add the custom chain​

We'll need to add a custom chain:

require("dotenv").config();
const { MNEMONIC, LINEASCAN_API_KEY } = process.env;
// ... rest of truffle-config
module.exports = {
  networks: {
    linea_mainnet: {
      provider: () => {
        return new HDWalletProvider(
          MNEMONIC,
          `https://rpc.goerli.linea.build/`,
        );
      },
      verify: {
        apiUrl: "https://api.lineascan.build/api",
        apiKey: LINEASCAN_API_KEY,
        explorerUrl: "https://lineascan.build/address",
      },
      network_id: "59144",
    },
  },
  // ... rest of truffle-config
};

Verify the smart contract​

Run the following to verify the most recently deployed contract:

truffle run verify <DEPLOYED_CONTRACT_NAME> --network linea_mainnet

Alternatively, verify a contract at a specific address:

truffle run verify <DEPLOYED_CONTRACT_NAME>@<ADDRESS> --network linea_mainnet

Your output should be similar to the following:

Verifying contracts on lineascan
   Verifying Token
   Pass - Verified: https://lineascan.build/address/<CONTRACT_ADDRESS>#code
   Successfully verified 1 contract(s).
Verifying contracts on sourcify
   Sourcify has no support for network linea_mainnet with chain id 59144

You can check that it was verified correctly by navigating to the block explorer and pasting in the deployed contract address.

verified contract