[Contract Verification] Example Contract CrowdfundingCampaign_UUPS verification error:"server response 503 Service Unavailable"

[tsubasakong]

Environment

Testnet

Block Explorer

https://explorer.zksync.io/

Issue Type

• Plugin
• Block Explorer

Contract Address

0x20467C100e233B06bEF2e7F3E3A366EA6D4A8022

Compiler Type

Single file

zkSolc Version

1.5.1

Solc Version

0.8.17

Contract Name

CrowdfundingCampaign_UUPS

Contract Code

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

contract CrowdfundingCampaign_UUPS is Initializable, UUPSUpgradeable, OwnableUpgradeable {
    uint256 public fundingGoal;
    uint256 public totalFundsRaised;
    mapping(address => uint256) public contributions;

    event ContributionReceived(address contributor, uint256 amount);
    event GoalReached(uint256 totalFundsRaised);

    // Initializer function, replaces constructor for upgradeable contracts
    function initialize(uint256 _fundingGoal) public initializer {
        __Ownable_init(); // Initialize ownership to the deployer
        __UUPSUpgradeable_init(); // Initialize UUPS upgradeability

        fundingGoal = _fundingGoal;
    }

    function contribute() public payable {
        require(msg.value > 0, "Contribution must be greater than 0");
        contributions[msg.sender] += msg.value;
        totalFundsRaised += msg.value;

        emit ContributionReceived(msg.sender, msg.value);

        if (totalFundsRaised >= fundingGoal) {
            emit GoalReached(totalFundsRaised);
        }
    }

    function withdrawFunds() public onlyOwner {
        require(totalFundsRaised >= fundingGoal, "Funding goal not reached");

        uint256 amount = address(this).balance;
        totalFundsRaised = 0;

        (bool success, ) = payable(owner()).call{value: amount}("");
        require(success, "Transfer failed.");
    }

    function getTotalFundsRaised() public view returns (uint256) {
        return totalFundsRaised;
    }

    function getFundingGoal() public view returns (uint256) {
        return fundingGoal;
    }

    // Ensure that only the owner can upgrade the contract
    function _authorizeUpgrade(address newImplementation) internal override onlyOwner {}
}

Constructor Arguments

import { getWallet } from "./utils";
import { Deployer } from '@matterlabs/hardhat-zksync';
import { ethers } from "ethers";
import { HardhatRuntimeEnvironment } from "hardhat/types";

export default async function (hre: HardhatRuntimeEnvironment) {
    const wallet = getWallet();
    const deployer = new Deployer(hre, wallet);

    const contractArtifact = await deployer.loadArtifact("CrowdfundingCampaign_UUPS");
    const fundingGoalInWei = ethers.parseEther('0.1').toString();

    const crowdfunding = await hre.zkUpgrades.deployProxy(
        getWallet(),
        contractArtifact,
        [fundingGoalInWei],
        { initializer: 'initialize' }
    );

    await crowdfunding.waitForDeployment();
}

Hardhat Verify Plugin Version

No response

Repo Link (Optional)

No response

Additional Details

Hi when I try to verify the uups proxy example contract following the steps in https://docs.zksync.io/build/zksync-101/upgrading#upgrade-to-the-crowdfundingcampaignv2_uups-contract on zk sepolia testnet ,as bun run hardhat verify 0x20467C100e233B06bEF2e7F3E3A366EA6D4A8022 the address is the proxy address. But return
···
server response 503 Service Unavailable (request={ }, response={ }, error=null, info={ "requestUrl": "https://sepolia.era.zksync.dev", "responseBody": "{"jsonrpc":"2.0","error":{"code":-32011,"message":"no backends available for method"},"id":2}\n", "responseStatus": "503 Service Unavailable" }, code=SERVER_ERROR, version=6.13.1)
···
The related verify config in the hardhat.config.ts is
···
zkSyncSepoliaTestnet: {
url: "https://sepolia.era.zksync.dev",
ethNetwork: "sepolia",
zksync: true,
verifyURL: "https://explorer.sepolia.era.zksync.dev/contract_verification",
},
···
The package.json below

{
  "name": "hello-zksync-quickstart",
  "description": "A template for zkSync smart contracts development with Hardhat",
  "private": true,
  "author": "Matter Labs",
  "license": "MIT",
  "repository": "https://github.com/matter-labs/zksync-hardhat-template.git",
  "scripts": {
    "deploy": "hardhat deploy-zksync --script deploy.ts",
    "compile": "hardhat compile",
    "clean": "hardhat clean"
  },
  "devDependencies": {
    "@matterlabs/hardhat-zksync": "^1.0.0",
    "@matterlabs/zksync-contracts": "^0.6.1",
    "@nomiclabs/hardhat-etherscan": "^3.1.7",
    "@nomicfoundation/hardhat-chai-matchers": "^2.0.6",
    "@openzeppelin/contracts": "^4.9.5",
    "@openzeppelin/contracts-upgradeable": "4.9.5",
    "@openzeppelin/upgrades-core": "^1.32.5",
    "@types/chai": "^4.3.4",
    "@types/mocha": "^10.0.1",
    "chai": "^4.3.7",
    "dotenv": "^16.0.3",
    "ethers": "^6.9.2",
    "hardhat": "^2.12.4",
    "mocha": "^10.2.0",
    "ts-node": "^10.9.1",
    "typescript": "^4.9.5",
    "zksync-ethers": "^6.7.0"
  }
}

[gleenai[bot]]

It appears that the issue you're encountering with the 503 Service Unavailable error during the verification process is related to the backend services for the zkSync Sepolia testnet being temporarily unavailable. This can happen due to maintenance or server issues on the zkSync side.

Here are a few steps you can take to resolve this issue:

1. Retry the Verification: Sometimes, the issue may be temporary. Try to verify the contract again after some time to see if the service has been restored.

2. Check zkSync Status: Visit the zkSync Status Page to check if there are any ongoing issues with the zkSync network, particularly the Sepolia testnet.

3. Contact Support: If the problem persists, consider reaching out to zkSync support or checking the zkSync Developer Forum for any announcements related to this issue.

4. Verify Network Configuration: Ensure that your network configuration in hardhat.config.ts is correct and that the url and verifyURL are pointing to the correct endpoints.

Since this is a server-side issue, there's limited action you can take from your side apart from waiting for a resolution or seeking further assistance from the zkSync team.

Your feedback helps us serve you better. If this fully addresses your question, please give it a thumbs up. If it doesn't, please give it a thumbs down. This will inform the community and team so we can improve our support.

[bxpana]

@tsubasakong I was able to replicate the same thing and will check with the team on how to verify the proxy

[bxpana]

@tsubasakong not sure what was going on, but it seems to be working now. If you run into issues with it again let us know.

[RomanYarinski]

Same for me today

Verifying proxy: 0xc8425C6A6058510F4E0014E1753142b03f14dA02
bad response (status=503, headers={"content-type":"application/json","vary":"Origin","x-proxyd-cache-status":"MISS","date":"Fri, 16 Aug 2024 15:07:00 GMT","content-length":"95","via":"1.1 google","alt-svc":"h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000","connection":"close"}, body="{\"jsonrpc\":\"2.0\",\"error\":{\"code\":-32011,\"message\":\"no backends available for method\"},\"id\":42}\n", requestBody="{\"method\":\"eth_getLogs\",\"params\":[{\"fromBlock\":\"0x0\",\"toBlock\":\"latest\",\"address\":\"0xc8425C6A6058510F4E0014E1753142b03f14dA02\",\"topics\":[\"0x7e644d79422f17c01e4894b5f4f588d331ebfa28653d42ae832dc59e38c9798f\"]}],\"id\":42,\"jsonrpc\":\"2.0\"}", requestMethod="POST", url="https://sepolia.era.zksync.dev", code=SERVER_ERROR, version=web/5.7.1)
Verifying proxy admin: 0x6130feCcc1C5C6B51b2Bd073a591f3357F2bA98A
bad response (status=503, headers={"content-type":"application/json","vary":"Origin","x-proxyd-cache-status":"MISS","date":"Fri, 16 Aug 2024 15:07:00 GMT","content-length":"95","via":"1.1 google","alt-svc":"h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000","connection":"close"}, body="{\"jsonrpc\":\"2.0\",\"error\":{\"code\":-32011,\"message\":\"no backends available for method\"},\"id\":42}\n", requestBody="{\"method\":\"eth_getLogs\",\"params\":[{\"fromBlock\":\"0x0\",\"toBlock\":\"latest\",\"address\":\"0x6130feCcc1C5C6B51b2Bd073a591f3357F2bA98A\",\"topics\":[\"0x8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0\"]}],\"id\":42,\"jsonrpc\":\"2.0\"}", requestMethod="POST", url="https://sepolia.era.zksync.dev", code=SERVER_ERROR, version=web/5.7.1)

[bxpana]

Might have been a connection. I'm still able to get it to work. If you run into issues again please open up another discussion so we can get all your details.