solidity – Fixing Brownie Deployment KeyError: ‘OpenZeppelin/[email protected]/Address’

Short answer is: you have to create the API key at etherscan.io either for the mainnet and the rest of public testnets (Ropsten, Rinkeby, Goerli..).

(Bonus)

In addition, I had some issues when trying to verify a contract with interfaces located in subdirectories.

Perhaps it is not your case, but if you are using Truffle to manage the contracts deployment, there is an interesting plug-in to verify the contract automatically: truffle-plugin-verify.

I tried it and it worked perfectly. You essentially need to

• Install the truffle & plugin via npm
• Create an API key on Etherscan
• Update the truffle configuration file
• Use a wallet to sign the transaction to create the contract (e.g.: @truffle/hdwallet-provider)
• Migrate, and finally, verify the contract

Linting issues If you see something along the lines of:

ParserError: Source "OpenZeppelin/[email protected]/contracts/access/Ownable.sol" not found: File not found.
import "@openzeppelin/contracts/access/Ownable.sol";

In your vscode, these and be safely ignored. However you can also add to your settings to ignore these.

1. Create a .vscode folder at the root of your project.
2. Create a file called settings.json Add the following code:

{
  "solidity.remappings": [
    "@chainlink/=/Users/patrick/.brownie/packages/smartcontractkit/[email protected]",
    "@openzeppelin/=/Users/patrick/.brownie/packages/OpenZeppelin/[email protected]"
  ]
}

Or whatever version your @chainlink and @openzeppelin contracts need. For example:

For more information see here