[Contract Verification] Smart Contract Verification Failure on zkSync Era

[nerses-asaturyan]

Team or Project

No response

ZK chain

zkSync Era

Environment

Mainnet

Block Explorer

Etherscan (e.g. https://era.zksync.network)

Issue Type

• Plugin
• Block Explorer

Contract Address

0x7a2b260bFc1d45d1Bf9689e512bA43c8C3037ABb

Compiler Type

Single file

zkSolc Version

1.5.11

Solc Version

0.8.23-1.0.1

Contract Name

NotProvided

Contract Code

NotProvided

Constructor Arguments

none

Hardhat Verify Plugin Version

No response

Repo Link (Optional)

No response

Additional Details

I am trying to verify smart contract using
npx hardhat verify --network ZKsyncEraMainnet 0x7a2b260bFc1d45d1Bf9689e512bA43c8C3037ABb

but I encounter issue

hardhat-zksync-verify found one or more errors during the verification process:

ZkSyncEtherscan:
Axios error (code: ERR_BAD_REQUEST) during the contract verification request
 Reason: Expected request with `Content-Type: application/json`

here is my hardhat.config.js file

require('dotenv').config();

const isZKsyncNetwork = process.env.HARDHAT_NETWORK?.toLowerCase().includes('zksync');

if (isZKsyncNetwork) {
  require('@matterlabs/hardhat-zksync');
  require('@matterlabs/hardhat-zksync-verify');
  require('@matterlabs/hardhat-zksync-solc');
} else {
  require('@nomicfoundation/hardhat-toolbox');
  require('@openzeppelin/hardhat-upgrades');
  require('@nomicfoundation/hardhat-ignition');
}
/** @type import('hardhat/config').HardhatUserConfig */
module.exports = {
  ignition: {
    strategyConfig: {
      create2: {
        salt: '0x0000000000000000000000000000000000000000000000000000000000011111',
      },
    },
  },
  solidity: {
    version: '0.8.23',
    zksolc: {
      version: '1.5.11',
      settings: {},
    },
    settings: {
      optimizer: {
        enabled: true,
        runs: 200,
      },
      viaIR: true,
    },
  },
  networks: {
    ZKsyncEraSepolia: {
      url: 'https://sepolia.era.zksync.dev',
      ethNetwork: 'sepolia',
      chainId: 300,
      zksync: true,
      accounts: [process.env.PRIV_KEY],
      verifyURL: 'https://explorer.sepolia.era.zksync.dev/contract_verification',
    },
    ZKsyncEraMainnet: {
      url: 'https://mainnet.era.zksync.io',
      ethNetwork: 'mainnet',
      chainId: 324,
      zksync: true,
      accounts: [process.env.priv_key_zk_sync],
      verifyURL: 'https://zksync2-mainnet-explorer.zksync.io/contract_verification',
    },
    hardhat: {
      zksync: true,
    },
  },
  etherscan: {
    enabled: true,
    apiKey: {
      zkSyncEraSepolia: process.env.etherscan,
      zkSyncEraMainnet: process.env.etherscan,
    },
    customChains: [
      {
        network: 'zkSyncEraMainnet',
        chainId: 324,
        urls: {
          apiURL: 'https://zksync2-mainnet-explorer.zksync.io/contract_verification',
          browserURL: 'https://explorer.zksync.io',
        },
      },
      {
        network: 'zkSyncEraSepolia',
        chainId: 300,
        urls: {
          apiURL: 'https://api-sepolia-era.zksync.network/api',
          browserURL: 'https://sepolia.explorer.zksync.io',
        },
      },
    ],
  },
  sourcify: {
    enabled: false,
  },
};

It successfully works for deployment

[JackHamer09]

Hey, @nerses-asaturyan, thanks for your report! I'll investigate the issue, in the meantime it could be helpful if you provide your package.json file (specifically I'm interested in dependencies versions)

[nerses-asaturyan]

{
  "name": "hardhat-project",
  "devDependencies": {
    "@matterlabs/hardhat-zksync": "^1.3.0",
    "@matterlabs/hardhat-zksync-deploy": "^1.6.0",
    "@matterlabs/hardhat-zksync-solc": "^1.2.5",
    "@nomicfoundation/hardhat-chai-matchers": "^2.0.0",
    "@nomicfoundation/hardhat-ignition-ethers": "^0.15.9",
    "@nomicfoundation/hardhat-network-helpers": "^1.0.0",
    "@nomicfoundation/hardhat-toolbox": "^3.0.0",
    "@nomicfoundation/hardhat-verify": "^1.1.1",
    "@typechain/ethers-v6": "^0.4.0",
    "@typechain/hardhat": "^8.0.0",
    "@types/chai": "^4.2.0",
    "@types/mocha": "^10.0.10",
    "chai": "^4.2.0",
    "hardhat": "^2.20.1",
    "hardhat-deploy": "^0.11.26",
    "hardhat-gas-reporter": "^1.0.8",
    "solidity-coverage": "^0.8.1",
    "typechain": "^8.2.0"
  },
  "dependencies": {
    "@nomicfoundation/hardhat-ethers": "^3.0.8",
    "@nomicfoundation/hardhat-ignition": "^0.15.9",
    "@nomiclabs/hardhat-etherscan": "^3.1.8",
    "@openzeppelin/contracts": "^5.0.2",
    "@safe-global/protocol-kit": "^5.2.2",
    "dotenv": "^16.4.5",
    "ethers": "^6.11.1",
    "viem": "^2.23.0"
  }
}

[JackHamer09]

Couldn't reproduce with fresh project created from npx zksync-cli@latest create. Very likely that is a bug which was fixed in newer versions of some of the package. Please try to upgrade to latest versions for hardhat and zksync related pacakges (e.g. hardhat, @matterlabs/hardhat-zksync or use npm update.

If you'll still face that issue after updating and need more help, please create a repo with reproducible example and I'll get it from there.