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How to Verify Your Smart Contract with the Blockscout UI

Learn how to verify smart contracts using Hardhat and the Blockscout UI. Ensure transparency, build user trust, and unlock full read-write interaction across EVM chains with Blockscout’s smart contract tools.

Revealer

30 Jun 2025 • 3 min read

Verifying smart contracts is a vital step in ensuring transparency and trust in blockchain applications. Through verification, users can review the source code of deployed contracts, fostering confidence and facilitating deeper interaction with decentralized systems.

Blockscout simplifies this process across various EVM-compatible chains and this is just one of the features that Blockscout offers for comprehensive smart contract coverage, along with advanced capabilities for reading, writing, and interacting with contracts and proxies. In this article, we’ll guide you through verifying your smart contracts directly through the Blockscout UI using Hardhat to deploy the contracts.

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Step 1. Set up Project with Hardhat.

Before proceeding, ensure that you have Node Package Manager (NPM) installed.

1. Initialize a new project using npm.

Enter the root directory of your system and run.

npm init -y

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2. Install Hardhat

npm install -- save-dev hardhat

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3. Run the setup wizard

npx hardhat

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4. Install hardhat toolbox

npm install --save-dev hardhat @nomicfoundation/hardhat-toolbox

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Go to your hardhat.config.ts file and add;

import "@nomicfoundation/hardhat-toolbox";

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Step 2. Setup your Config file

First let's install dotenv to save our private keys

npm install dotenv

Add your private key and your network URL to the .env file in your editor.

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Deploy using Hardhat ignition

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Step 3. Verify on Blockscout UI

Paste the deployed contract address on the search bar and click on the details. Next click the Verify and publish button

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You will be directed to the verification page; fill in the details of your smart contract.

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Contract License

This is a legal notice declared at the very top of a smart contract file using the SPDX-License-Identifier.

Verification method

Blockscout provides up to nine methods for verifying your contracts.

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Solidity (Single file) - Can be used for unverified contracts
Solidity (Stardard Json Output) - Can be used for partially verified contracts.
Solidity (Sourcify) - Used for contracts verified with sourcify
Solidity (Multi-part files) - Can be used for unverified contracts
Soldidty (Hardhat) - Used for contracts verified with harhat
Solidity (Foundry) - Used for contracts deployed with foundry
Vyper (contract) - Can be used for unverified vyper contracts
Vyper (Multipart files) - Can be used for unverified multiple vyper contracts
Vyper (Stardard Json Output) - Can be used for partially verified vyper contracts.

💡

Use the JSON file for partially verified contracts. Single/Multi file Methods do not work with partial verification.

Selecting a verification method will generate a set of configuration options based on the chosen method. For example, when using Solidity Standard JSON Output, you need to import your JSON file and select your compiler version.

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Click on the Verify and publish button.

⚠️

If hardhat is used to deploy contracts, the standard json may be obtained from artifacts/build-info/{build_hash}.json file

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Conclusion

Verifying smart contracts through the Blockscout UI is an easy and effective way to enhance transparency, trust, and credibility in your decentralized applications. Making your source code public allows users and developers to inspect, audit, and interact with your contracts more confidently.

Blockscout’s support for multiple verification methods streamlines the process across various EVM-compatible networks, and its user-friendly interface, combined with advanced tools for interacting with both contracts and proxies, gives developers a significant edge over manual or CLI-based verification methods.