How to Verify Smart Contracts Using Hardhat

This guide allows you to automatically verify your smart contracts' source code on Kaiascope straight from your CLI using the Hardhat Verify Plugin.

To verify your contract on Kaia, you need to add the following configuration to your hardhat.config.js:

Kaiascan

Mainnet
Kairos


module.exports = {
  etherscan: {
      apiKey: {
        kaia: "unnecessary",
      },
      customChains: [
        {
          network: "kaia",
          chainId: 8217,
          urls: {
            apiURL: "https://mainnet-api.kaiascan.io/hardhat-verify",
            browserURL: "https://kaiascan.io",
          }
        },
      ]
    }
}


module.exports = {
  etherscan: {
      apiKey: {
        kairos: "unnecessary",
      },
      customChains: [
        {
          network: "kairos",
          chainId: 1001,
          urls: {
            apiURL: "https://kairos-api.kaiascan.io/hardhat-verify",
            browserURL: "https://kairos.kaiascan.io",
          }
        },
      ]
    }
}

Kaiascope

Mainnet
Kairos


module.exports = {
  networks: {
    kaia: {
      chainId: 8217,
      url: "RPC_URL",
    },
  },
  etherscan: {
    apiKey: {
      kaia: "unnecessary",
    },
    customChains: [
      {
        network: "kaia",
        chainId: 8217,
        urls: {
          apiURL: "https://api-cypress.klaytnscope.com/api",
          browserURL: "https://kaiascope.com/",
        },
      },
    ]
  }
}


module.exports = {
  networks: {
    kairos: {
      chainId: 1001,
      url: "RPC_URL",
    },
  },
  etherscan: {
    apiKey: {
      kairos: "unnecessary",
    },
    customChains: [
      {
        network: "kairos",
        chainId: 1001,
        urls: {
          apiURL: "https://api-baobab.klaytnscope.com/api",
          browserURL: "https://kairos.kaiascope.com",
        },
      },
    ]
  }
}

To verify the contract, you will run the verify command and pass in the address of the deployed contract, network and parameters if any.


npx hardhat verify –network <network> <deployed_address> <parameters>
// example
npx hardhat verify --network kairos 0x3e360fC99c4383e3adaAE9742c0fC983fDAa0535

In your terminal you should see the source code for your contract was successfully submitted for verification.

If the verification was successful, you should see Successfully verified contract and there will be a link to the contract code on Kaiascan and Kaiascope respectively.

Kaiascan

Kaiascope

Kaiascan​

Kaiascope​

Useful links​

Kaiascan

Kaiascope

Useful links