> For the complete documentation index, see [llms.txt](https://docs.harmony.one/home/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.harmony.one/home/developers/deploying-on-harmony/smart-contract-verification.md).

# Smart Contract Verification

<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

To flatten your solidity files we recommended to use [Truffle Flattener lib](https://www.npmjs.com/package/truffle-flattener).

```javascript
npm install truffle-flattener -g
truffle-flattener <solidity-files>
```

Or you can use any other flattener lib.

## 2. Deploy Contract to Harmony

To easy the verification we recommend the contract deployment using [Harmony Remix](/home/developers/deploying-on-harmony/using-remix/deployment-using-remix.md).

## 3. Verify Contract

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

![Verify Contract](/files/-Mez8aLukIa32Qf8A5Wl)

It is important to use the correct parameters (same as on deployment):

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

Then click on **Submit** button. If all params are correct - you should to see a Success message, or an Error if bytecodes are not equal. On Success case - your contract will verify and you will see all contract details on contract explorer page.

![Contract Verification](/files/-Mez97Pbz97Vmyjscmnn)