Having a weird issue with tx.wait() on latest hardhat (lesson 6) (I'm going crazy, please help)

[Chevy3000]

Hi guys,

Hoping someone can help me out here.
I am on lesson 6, deploying the SimpleStorage contract to sepolia, everything runs smoothly until I reach verify, I keep getting the following error:

ContractVerificationMissingBytecodeError: Failed to send contract verification request.
Endpoint URL: https://api-sepolia.etherscan.io/api
Reason: The Etherscan API responded that the address 0xd5999bA6cDbd82D8646b81B809Ee05Cb465503b3 does not have bytecode.
This can happen if the contract was recently deployed and this fact hasn't propagated to the backend yet.
Try waiting for a minute before verifying your contract. If you are invoking this from a script,
try to wait for five confirmations of your contract deployment transaction before running the verification subtask.

This would make sense to me however I have already waited for 6 confirmations before calling verify():

    if (network.config.chainId === 11155111 && process.env.ETHERSCAN_API_KEY) {
        await simpleStorage.deploymentTransaction().wait(6)
        await verify(ssadd, [])
    }

Once I deploy the script and get the verification error, I can verify in the console by typing:

yarn hardhat verify --network sepolia 0xd5999bA6cDbd82D8646b81B809Ee05Cb465503b3

This make me think that my script and environment variables have been set up correctly and it is indeed just an issue with waiting after deployment.

So I tested something, I put await simpleStorage.deploymentTransaction().wait(100000) to wait 100,000 blocks before verifying, expecting the script too hang and take too long to finish. however it took even less time than before. I'm thinking that I'm not waiting properly in my script but I cant understand why :(

After trying a lot of solutions I'm thinking it could be that the latest hardhat uses ethers6 and maybe I'm using the deploymentTrancasction() or the waitforDeployment() functions wrong. Or maybe I have not understood async functions properly and am not using tx.wait() properly.

Hoping someone has some ideas to help me :)

I've attached my script and my repo.

const { ethers, run, network } = require("hardhat")

async function main() {
    const SimpleStorageFactory = await ethers.getContractFactory(
        "SimpleStorage"
    )
    console.log("deploying")
    const simpleStorage = await SimpleStorageFactory.deploy()
    await simpleStorage.waitForDeployment()
    ssadd = await simpleStorage.getAddress()
    console.log(`deployed to ${ssadd}`)
    if (network.config.chainId === 11155111 && process.env.ETHERSCAN_API_KEY) {
        await simpleStorage.deploymentTransaction().wait(6)
        await verify(ssadd, [])
    }
}

async function verify(contractAddress, args) {
    console.log("verifying")
    try {
        await run("verify:verify", {
            address: contractAddress,
            constructorArguments: args,
        })
    } catch (e) {
        if (e.message.toLowerCase().includes("already verified")) {
            console.log("already verified")
        } else {
            console.log(e)
        }
    }
}
main()
    .then(() => process.exit(0))
    .catch((error) => {
        console.error(error)
        process.exit(1)
    })

Repo: https://github.com/Chevy3000/Hardhat_ss

Thanks for the help.

[aaankeet]

@Chevy3000
Your code is fine I am able to verify through your deploy script. I think you are having some issue with Etherscan Api and sometimes etherscan throws this error.

ContractVerificationMissingBytecodeError: Failed to send contract verification request.
Endpoint URL: https://api-sepolia.etherscan.io/api
Reason: The Etherscan API responded that the address 0xd5999bA6cDbd82D8646b81B809Ee05Cb465503b3 does not have bytecode.
This can happen if the contract was recently deployed and this fact hasn't propagated to the backend yet.
Try waiting for a minute before verifying your contract. If you are invoking this from a script,
try to wait for five confirmations of your contract deployment transaction before running the verification subtask.

also you don't need this await simpleStorage.deploymentTransaction().wait(6) since you are using waitForDeployment() which resolves to the contract once the bytecode is deployed or resolves immediately if already deployed.

Here's my Run

First one without await simpleStorage.deploymentTransaction().wait(6)
and second one with await simpleStorage.deploymentTransaction().wait(6)

Hope It Helps

[Chevy3000]

Hi @aaankeet, thank you so much for testing and responding. It really helps to know that you were able to run the code fine.

I agree that await simpleStorage.deploymentTransaction().wait(6) isn't necessary, I added it in desperation trying to get veriify() to work.

Seems so weird that it's an issue with etherscan but I don't know what else it could be. I'll just have to verify manually from the console for now, at least I'll be able to move on with the course now.

I'll leave the discussion for a a day or two in case someone has anything to add before I mark it as answered.

Thanks again.

[aaankeet]

@Chevy3000 are you still getting the same error? maybe try deleting cache and artifacts and then run the script.