# Submit your contract to explorer

Once verified, a smart contract or token contract's source code becomes publicly available and verifiable. This creates transparency and trust. Plus, it's easy to do!

There are two ways to verify source code:

* [Via explorer](/services/explorer/smart-contract-verification/via-explorer.md)
* [Via Hardhat](/services/explorer/smart-contract-verification/via-hardhat-plugin.md)

In this tutorial we only focus on Hardhat.

## Verify

In the last section, we have deployed `Lock` contract on Nebulas testnet:

{% code overflow="wrap" %}

```
Lock with 0.001U2U and unlock timestamp 1696615281 deployed to 0x8D51395C76C34d0e11178c1F7EE3219B4b958e30
```

{% endcode %}

To verify the contract source code with Hardhat, below is the command:

```
npx hardhat verify --network NETWORK DEPLOYED_CONTRACT_ADDRESS [ARG_1 ARG_2 ...]
```

* `NETWORK`: You need to provide which network you have used, eg. `nebulas`
* `DEPLOYED_CONTRACT_ADDRESS`: Where the contract is deployed at, eg. `0x8D51395C76C34d0e11178c1F7EE3219B4b958e30`
* `[ARG_1 ARG_2 ...]`: Arguments that passed to the contructor when the contract is deployed, eg. `unlockTime`

Let's verify it:

{% code overflow="wrap" %}

```
npx hardhat verify --network nebulas 0x8D51395C76C34d0e11178c1F7EE3219B4b958e30 1696615281
```

{% endcode %}

It will result:

```
Successfully submitted source code for contract
contracts/Lock.sol:Lock at 0x8D51395C76C34d0e11178c1F7EE3219B4b958e30
for verification on the block explorer. Waiting for verification result...

Successfully verified contract Lock on the block explorer.
https://testnet.u2uscan.xyz/address/0x8D51395C76C34d0e11178c1F7EE3219B4b958e30?tab=contract
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.u2u.xyz/for-developers/smart-contract-development/submit-your-contract-to-explorer.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.