Can't verify contract on etherscan.io

Question

guys. I have created simple contract, migrated to testnet via truffle. It can be founded here. But I can't verify it. I double check:
1. name of contract
2. version of compiler (ver. 0.4.11 in etherscan and in solc inside truffle)
3. optimization is enabled as in truffle they are enabled
4. we have no construtor arguments or imports

I try migrating several times with my friend. No success. Any suggestions or help?

Answer 1

I was able to successfully verify the contract code you linked in a new deployment.

Are you sure the parameters and source code you used were identical to those you used in the verification tool?

For reference, here is the verification of the new deployment of your contract.

EDIT:

It might be that you are having the same problem as I am having now. It seems like the remix and truffle compilations produce different bytecodes for some reason.

Answer 2

I've met same problem with contract verification at etherscan.io. https://etherscan.io/verifyContract2 - helped in my case.

Thank you

Answer 3

I created truffle-plugin-verify to automate Truffle contract verification on Etherscan.

---

1. Install the plugin with npm

npm install truffle-plugin-verify

2. Add the plugin to your truffle.js or truffle-config.js file

module.exports = {
  /* ... rest of truffle-config */

  plugins: [
    'truffle-plugin-verify'
  ]
}

3. Generate an API Key on your Etherscan account (see the Etherscan website)
4. Add your Etherscan API key to your truffle config

module.exports = {
  /* ... rest of truffle-config */

  api_keys: {
    etherscan: 'MY_API_KEY'
  }
}

---

After migrating your Deck contract to Rinkeby, you are able to verify it on Etherscan by running:

truffle run verify Deck --network rinkeby

---

More information can be found on the repository or in my article Automatically verify Truffle smart contracts on Etherscan.