Hardhat

These are the steps for verifying smart contracts via Hardhat. Hardhat is a comprehensive development environment that facilitates contract compilation, deployment, and authentication.

Step 1: Install Hardhat.

If creating a new npm project from scratch, navigate to an empty directory and execute the command npm init. Follow the instructions provided, and it is recommended to use npm 7 or a later version. Once the project is ready, use either the npm or yarn command below.

npm instructions:

npm install --save-dev hardhat

yarn instructions:

yarn add --dev hardhat

Step 2: Install the Hardhat plugin (requires v3.0.0+). Use either the npm or yarn commands:

npm instructions:

npm install --save-dev @nomiclabs/hardhat-etherscan

yarn instructions:

yarn add --dev @nomiclabs/hardhat-etherscan

Step 3: For hardhat.config.js, add the following statement:

require("@nomiclabs/hardhat-etherscan");

For TypeScript, add the following line to hardhat.config.ts:

import "@nomiclabs/hardhat-etherscan";

Step 4: Add Cascadia to hardhat.config.js.

etherscan: {
  apiKey: {
    cascadia: "abc"
  },
  customChains: [
    {
      network: "cascadia",
      chainId: 6102,
      urls: {
        apiURL: "https://explorer.cascadia.foundation/api",
        browserURL: "https://explorer.cascadia.foundation",
      }
    }
  ]
}

apiKey: Refers to the unique API key associated with the block explorer account.

network: Specifies the name of the network, which must match the name of the apiKey.

browserURL: Indicates the URL for accessing the block explorer interface.

chainID: Identifies the unique identifier for the network chain being accessed.

apiURL: Specifies the URL used for accessing the block explorer's API service.

The entire code should appear as follows:

require("@nomicfoundation/hardhat-toolbox");
require("@nomiclabs/hardhat-etherscan");
require('dotenv').config()
const private_key = process.env.PRIVATE_KEY
module.exports = {
  solidity: "0.8.17",
  networks: {
    cascadia: {
      url: "https://testnet.cascadia.foundation",
      accounts: [private_key]
    }
  },
  etherscan: {
    apiKey: {
      cascadia: "abc"
    },
    customChains: [
      {
        network: "cascadia",
        chainId: 6102,
        urls: {
          apiURL: "https://explorer.cascadia.foundation/api",
          browserURL: "https://explorer.cascadia.foundation",
        }
      }
    ]
  }
};

Step 5: Check if Cascadia is successfully supported:

npx hardhat verify --list-networks

Step 6: To verify the contract, constructor arguments can be included with the verify task.

npx hardhat verify --network <network_name> DEPLOYED_CONTRACT_ADDRESS “Constructor argument 1”

For example:

npx hardhat verify –network Cascadia 0x856C336cD8eBDCE7B5Bb3F2DEB1bf3160B176880 31536000

Step 7: Contract verification can be confirmed via the console: