How to verify a smart contract using the HashScan Smart Contract Verification tool.
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Verifying smart contracts helps ensure the deployed bytecode matches the expected source files. Smart Contract Verifier is a tool that simplifies this process. This guide will walk through the basic steps of smart contract verification using the HashScan Smart Contract Verifier tool.
EVM address of the smart contract deployed on the Hedera network.
After importing the source files, if you get the "Contract <contract name> is ready to be verified" message, click VERIFY to initiate the verification process. Sourcify will then compare the deployed contract bytecode to the source files you imported in the previous step.
Full Match: Indicates the bytecode is a full (perfect) match, including all the metadata. The contract source code and metadata settings are identical to the deployed version.
Partial Match: Indicates the bytecode mostly (partially) matches with the deployed contract, except for the metadata hash like comments or variable names. It is usually sufficient for most verification purposes.
To view the verified contract repository, click View Contract Sources in the Contract Bytecode section on HashScan. This will open a verified contract repository search page window.
A summary of your contract's verification details will be displayed in the new window. Verification details include the contract address, source code files, match type, chain ID, metadata, and an option to open the repository in Remix.
To be directed to the Sourcify Contract Repository search page, click on ⬅ 296.
If you change your contract or want to upgrade your contract from a Partial Match to a Full Match, there are two options for re-verification:
Enter the smart contract address and chain, then click Verify.
Solidity of the deployed smart contract.
Solidity of the deployed smart contract.
Open a web browser and navigate to . Make sure you are on the correct Hedera network (Mainnet, Testnet, or Previewnet), and search for the deployed contract address in the search bar at the top of the page. In the Contract Bytecode section click on Verify Contract. The source code file importer popup window will open.
Add your Solidity source code files in the source file importer popup. Source files include the smart contract (.sol) and (.json ) file. The metadata file can be found in the artifacts/ directory of your smart contract project and its name correlates with the smart contract. For example, the metadata for the HelloHedera.sol contract would be called HelloHedera.json.
Required for Full Match Verification: Both the metadata file found in the contracts/artifacts/ folder and the smart contract's Solidity file. More details .
Required for Full Match Verification: Only the output of the compilation JSON file found in the /artifacts/build-info/ folder. More details .
Required for Full Match Verification: Both the metadata file (generated by solc --metadata) and the smart contract's Solidity file. More details .
If your verification is successful, the verifier will return either a or status. Let's review each verification status and what they mean:
To learn more about each verification match status, head over to the official Sourcify documentation .
Congratulations! 🎉 You have successfully learned how to verify a smart contract. Feel free to reach out on if you have any questions!
Head to the smart contract verifier and import your new updated source files.
Revisit and use the Re-verify Contract flow. Then proceed to Steps 2 through 5.
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Editor: Ed, DevRel Engineer
Writer: Krystal, Technical Writer
Editor: Nana, Sr. Software Manager
Editor: Logan, Software Engineer Intern
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