## Verifying Already Deployed Contracts We can verify a smart contract that's already been deployed using the `Deployer` object. We will use the `at()` method. The `at()` method is a static method used to interact with a contract that has already been deployed. We can verify a deployed contract by grabbing the contract's address and using it in the `at()` method. ### Verifying a Smart Contract We can verify the deployed *favorites* contract in the `deploy.py` file: ```python favorites_contract = favorites.at("0x4C7EE301AC56BDaE56B95FB4a6Dc2e26D0D9DC350") result = active_network.has_explorer() if result == active_network.mockchain: result.wait_for_verification(favorites_contract) ``` The code above shows how to verify a previously deployed smart contract. We can copy the contract address from the Blockscout website and use it to interact with the contract. Then, we can use the `wait_for_verification()` method to verify that the contract has been successfully verified. We can add code that verifies a deployed smart contract in the `deploy.py` file: ```python def deploy_favorites() -> VyperContract: favorites_contract: VyperContract = favorites.deploy() starting_number: int = favorites_contract.retrieve() print(f"Starting number is: {starting_number}") favorites_contract.store(77) ending_number: int = favorites_contract.retrieve() print(f"Ending number is: {ending_number}") active_network = get_active_network() favorites_contract = favorites.at("0x4C7EE301AC56BDaE56B95FB4a6Dc2e26D0D9DC350") if active_network.has_explorer(): result = active_network.mockchain result.wait_for_verification(favorites_contract) return favorites_contract def moccasin_main() -> VyperContract: return deploy_favorites() ``` This code verifies that a deployed smart contract exists in the `favorites.py` file. We can execute the script and see that the verification is successful. The code then prints the beginning and ending numbers from the verified contract.