Verifying contracts in Remix - Remix Tutorial 21

Key Concepts

Smart contract verification, Remix IDE, EtherScan, Sepolia test network, Contract Verification Plugin, API key, Source code verification, Deployment details, Verification status.

Contract Verification on EtherScan from Remix IDE

Introduction

This video demonstrates how to verify a deployed smart contract on EtherScan directly from the Remix IDE. The process is shown using the Sepolia test network, but the same steps apply to other networks. The key prerequisite is that the smart contract must already be deployed on a public network.

Activating the Contract Verification Plugin

1. Access Plugin Manager: Click the plugin icon in the left sidebar of Remix IDE.
2. Search for Plugin: Type "verification" in the search bar.
3. Activate Plugin: Find the "Contract Verification" plugin and click "Activate."
4. Access Plugin: The plugin is now accessible from the left sidebar using its dedicated icon.

Using the Contract Verification Plugin

The plugin has four tabs: "Verify," "Receipt," "Lookup," and "Settings."

Settings Tab

• API Key: To verify with EtherScan, an EtherScan API key is required. Create a free account on EtherScan and copy the API key. Paste this key into the plugin's settings tab.

Verify Tab

1. Chain Selection: Choose the network where the contract is deployed (e.g., Sepolia).
2. Contract Address: Enter the contract address. This can be found in the deployment details within Remix if the contract was deployed from there.
3. Contract Name: Input the exact contract name used in Remix.
4. Verification Tools: Select the verification services to use (e.g., EtherScan). Multiple services can be selected.
5. Initiate Verification: Click the "Verify" button. Remix will then use the selected services' APIs to verify the contract.

Receipt Tab

• Verification Status: After verification, the "Receipt" tab displays the status of each verification attempt.
• Successful Verification: A successful verification is indicated by a check mark next to the entry.
• Troubleshooting: If verification fails, ensure the contract is deployed, the address and contract name are correct, and then try again.

EtherScan Contract Page

• Accessing the Page: Click the icon provided in the "Receipt" tab to navigate to the contract's page on EtherScan.
• Verified Code: The page will display the verified source code of the smart contract.
• Interaction: The "Read" and "Write" tabs on EtherScan allow interaction with the deployed smart contract.

Lookup Tab

1. Contract Address Input: Paste the contract address into the "Lookup" tab.
2. Verification Status Check: The lookup feature checks the verification status of the contract across various services.
3. Open in Remix: It provides an option to open the contract directly in Remix.

Conclusion

The video provides a step-by-step guide on how to use the Contract Verification plugin in Remix to verify smart contracts on EtherScan. This process ensures transparency and allows users to interact with the contract through EtherScan's "Read" and "Write" functionalities.