[OP Stack Deployment] <unable to get compiled [bytecodel) on OP Etherscan for Smart Contract Verification>

[AmyMarcella2022]

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Issue Description

I'm encountering an error when attempting to verify and publish my smart contract source code on the Optimism platform. Specifically, I'm receiving the following error message: "Error! Unable to generate Contract Bytecode and ABI (General Exception, unable to get compiled [bytecode])".
I've already tried compiling my code using the Remix-Solidity IDE, and it successfully generated the bytecode without any errors. This suggests that the issue might be related to my development environment or the specific configuration of the Optimism platform.

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[Chomtana]

Hi, how do you verify the contract on Optimism Etherscan?

• Go to the contract page on Etherscan -> Click on verify and copy-n-paste the source code
• Or use a remix plugin to verify the contract

[AmyMarcella2022]

I did all that but the error keeps showing up!

[Chomtana]

Can you put your project to hardhat and try to verify from hardhat?

Here is ChatGPT generated guide to do that

To convert a Remix project to a Hardhat project and verify a contract on Optimism Etherscan, follow these steps:

1. Install Hardhat and Initialize the Project

1. Create a new folder for your Hardhat project:

   mkdir hardhat-project
   cd hardhat-project

2. Install Hardhat in your new folder:

   npm init -y
   npm install --save-dev hardhat

3. Initialize Hardhat:

   npx hardhat

   Select "Create an empty hardhat.config.js" for the simplest setup.

2. Move Your Remix Code to Hardhat

1. Copy your Solidity contracts from the Remix project (usually located in the contracts/ folder) to the contracts/ folder in your Hardhat project.

2. If you have any scripts for deployment (in Remix, you may use a script or just deploy manually), create a scripts/ folder in the Hardhat project and move or recreate your deployment script.

Example deployment script (scripts/deploy.js):

async function main() {
    const [deployer] = await ethers.getSigners();
    
    console.log("Deploying contract with the account:", deployer.address);

    const Contract = await ethers.getContractFactory("YourContract");
    const contract = await Contract.deploy();

    console.log("Contract deployed to:", contract.address);
}

main().catch((error) => {
    console.error(error);
    process.exitCode = 1;
});

3. Configure Hardhat for Optimism

1. Install Optimism's Ethereum package and Etherscan plugin for Hardhat:

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

2. Modify your hardhat.config.js to include the Optimism network and Etherscan API key:

   require("@nomiclabs/hardhat-etherscan");
   require("@nomiclabs/hardhat-ethers");
   
   module.exports = {
       solidity: "0.8.4", // Match your contract's Solidity version
       networks: {
           optimism: {
               url: 'https://opt-mainnet.g.alchemy.com/v2/YOUR_ALCHEMY_API_KEY', // Replace with Alchemy or Infura RPC URL
               accounts: ['YOUR_PRIVATE_KEY'] // Replace with the deployer's private key
           },
       },
       etherscan: {
           apiKey: 'YOUR_OPTIMISM_ETHERSCAN_API_KEY', // Optimism Etherscan API Key
       }
   };

4. Compile and Deploy Your Contract

1. Compile your contract:

   npx hardhat compile

2. Deploy your contract:

   npx hardhat run scripts/deploy.js --network optimism

5. Verify Your Contract on Optimism Etherscan

1. After deployment, you will receive the contract address. You can verify the contract on Optimism Etherscan with this command:

   npx hardhat verify --network optimism CONTRACT_ADDRESS ARGUMENTS

   If your contract constructor has arguments, replace ARGUMENTS with the actual values. If it doesn't, just leave it blank after the contract address.

For example, if the constructor doesn't have arguments:

npx hardhat verify --network optimism 0xYourContractAddress

Troubleshooting:

• Ensure that your Solidity compiler version in Hardhat (hardhat.config.js) matches the one used in Remix.
• Use the correct RPC URL for the Optimism network. If you're using Alchemy or Infura, make sure to create a project there and get the API key.
• If verification fails, double-check the constructor arguments and ensure the network is set to Optimism.