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Verify Smart Contract using Hardhat

Verifying a smart contract allows developers to review your code from within the CeloScan Block Explorer

Prerequisites​

Before the installation steps you need to have your hardhat project initialized using the command

npx hardhat init

Make sure to have dependencies installed!

Configuration​

Some initial installation and configuration is required.

Installation​

Use the following command to install

npm i hardhat-celo --save-dev

Hardhat Configuration​

Import the plugin in your hardhat.config.js:

require("hardhat-celo");

Or if you are using TypeScript, in your hardhat.config.ts:

import "hardhat-celo";

Remove / Comment the import for @nomicfoundation/hardhat-toolbox

Add the following configuration to the config object in hardhat.config.js.

networks: {
        alfajores: {
            // can be replaced with the RPC url of your choice.
            url: "https://alfajores-forno.celo-testnet.org",
            accounts: [
                "<YOUR_PRIVATE_KEY>"
            ],
        },
        celo: {
            url: "https://forno.celo.org",
            accounts: [
                "<YOUR_PRIVATE_KEY>"
            ],
        }
    },
    etherscan: {
        apiKey: {
            alfajores: "<CELOSCAN_API_KEY>",
            celo: "<CELOSCAN_API_KEY>"
        },
    },

Verifying Contracts​

Use the following command (Make sure your contracts are compiled before verification)

Alfajores Testnet

npx hardhat verify <CONTRACT_ADDRESS> <CONSTRUCTOR_ARGS> --network alfajores

Celo Mainnet

npx hardhat verify <CONTRACT_ADDRESS> <CONSTRUCTOR_ARGS> --network celo

Alternatively, You can read an in depth guide about how to deploy and verify contracts on Celo Block Explorer (sourcify) programmatically using the hardhat-deploy plugin here.