Hardhat Verify contract issue

[KarthickSakthi]

tried to verify contract in polygon mumbai!

Harhat version: ^2.15.0

  const hre = require("hardhat");


  const ETHERSCAN_API_KEY = ""
  async function  deploy(){

  const simpleStorageFactory = await hre.ethers.deployContract("SimpleStorage");
  await simpleStorageFactory.waitForDeployment();
  console.log("simpleStorageFactory",await simpleStorageFactory)
  console.log("Deploying....");
  console.log(`Deployed contract to ${await simpleStorageFactory.getAddress() }`)


  if(hre.network.config.chainId === 80001 && ETHERSCAN_API_KEY ){
    console.log("waiting for confirmation")
    await simpleStorageFactory.deploymentTransaction(6);
    await verify(await simpleStorageFactory.getAddress(),[])
  }

  const currentValue = await simpleStorageFactory.retrieve();
  console.log(`Current Valur is: ${currentValue}`);

  // update value
  const transactionResponse = await simpleStorageFactory.store(10);
  await transactionResponse.wait(1);
   const newCurrentValue = await simpleStorageFactory.retrieve();
   console.log(`Newly update current value is ${newCurrentValue}`)

}

async function verify(contractAddress, args){
  console.log("Verifying contract");
  try{
   await hre.run("verify:verify",{
    address: contractAddress,
    constructorArguments: args
   })
  }
  catch(e){
    if(e.message.toLowerCase().includes("already verified")){
      console.log("Already Verified")
    }
    else{
      console.log("Contract Verification Error: ",e)
    }

  }
}

deploy().then(()=> process.exit(0)).catch((error)=>{ console.error(error); process.exit(1)});

when calling verify(), running into issue:

Contract Verification Error:  ContractVerificationMissingBytecodeError: Failed to send contract verification request.
Endpoint URL: https://api-testnet.polygonscan.com/api
Reason: The Etherscan API responded that the address 0x8F90aeB399FcA8A7F30B41e7613040b49a0Dd169 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.
    at Etherscan.verify (/workspace/hardhat-simple-storage/node_modules/@nomicfoundation/hardhat-verify/src/etherscan.ts:108:13)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at SimpleTaskDefinition.action (/workspace/hardhat-simple-storage/node_modules/@nomicfoundation/hardhat-verify/src/index.ts:468:33)
    at Environment._runTaskDefinition (/workspace/hardhat-simple-storage/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/workspace/hardhat-simple-storage/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at SimpleTaskDefinition.action (/workspace/hardhat-simple-storage/node_modules/@nomicfoundation/hardhat-verify/src/index.ts:295:9)
    at Environment._runTaskDefinition (/workspace/hardhat-simple-storage/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)
    at Environment.run (/workspace/hardhat-simple-storage/node_modules/hardhat/src/internal/core/runtime-environment.ts:163:14)
    at SimpleTaskDefinition.action (/workspace/hardhat-simple-storage/node_modules/@nomicfoundation/hardhat-verify/src/index.ts:544:7)
    at Environment._runTaskDefinition (/workspace/hardhat-simple-storage/node_modules/hardhat/src/internal/core/runtime-environment.ts:330:14)

[alfaqi]

you have to wait about 5 blocks confirmation.
if you deployed your contract, comment out the rest of the code and only run the verify function with address of your deployed contract and args.
see here (Bytecode not found error in verification request (chapter 6) #5720)

[KarthickSakthi]

Solution:

Better to have a function to wait for sometime before calling the verify method

updated code:

async function sleep(ms) {
  return new Promise((resolve) => setTimeout(resolve, ms));
}


// update the if condition in deploy()
  if(hre.network.config.chainId === 80001 && ETHERSCAN_API_KEY ){
    console.log("waiting for confirmation")
    await sleep(30 * 1000);  // wait for sometime to update the backend of the Network
    await verify(await simpleStorageFactory.getAddress(),[])
  }

This will work, and your contract will be verified and published on the network