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smart-contract-verification.md

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Smart Contract Verification

A quick guide on how to verify your contracts on Harmony.

https://explorer.harmony.one/verifycontract

Right now, we support verification only for one single solidity file - therefore, before deployment and verification, you will need to flatten all solidity sources to one file.

1. Flatten your solidity files (only for multiple files)

To flatten your solidity files we recommended to use https://www.npmjs.com/package/truffle-flattener

npm install truffle-flattener -g

truffle-flattener <solidity-files>

Or you can use any other flattener lib

2. Deploy contract to Harmony

To more easy verification we recommend to deploy contract with Harmony Remix https://docs.harmony.one/home/developers/deploying-on-harmony/using-remix/deployment-using-remix

3. Verify contract

You can verify your contract here https://explorer.harmony.one/verifycontract

Important to use correct params (the same like on deploy):

  • Contract address
  • Contract name
  • Compiler version
  • Optimizer
  • Chain Type (mainnet or testnet)
  • Sources
  • Imported libs

Then click Submit button

If all parameters are correct - you should to see Success message, or Error if bytecodes don't equal

On Success case - you contract will verify and you will see all contract details on contract explorer page

4. Verify contract with constructor arguments (for contracts that were created with constructor parameters)

https://docs.soliditylang.org/en/develop/abi-spec.html

To get ABI-encoded constructor arguments you can ue this service: https://abi.hashex.org

Example for Harmony Remix:

1 - click ABI to copy it image

2 - paste ABI to https://abi.hashex.org form and click parse image

3 - paste your constuctor arguments and click Copy image

4 - paste encoded constructor arguments to verify form field image