> ## Documentation Index
> Fetch the complete documentation index at: https://docs.seitrace.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Hardhat verification plugin
> Hardhat is a full-featured development environment for contract compilation, deployment and verification. The Hardhat Verification Plugin supports contract verification on Seitrace.
## **Get started**
1. **Install Hardhat**
If you are starting from scratch, create an npm project by going to an empty folder, running `npm init`, and following the instructions. Recommend npm 7 or higher.
**Once your project is ready:**
**npm instructions**
```
npm install --save-dev hardhat
```
**yarn instructions**
```
yarn add --dev hardhat
```
2. **Create a project**
Run `npx hardhat` in your project folder and follow the instructions to create ([more info here](https://hardhat.org/getting-started/#quick-start)).
3. **Install plugin**
Install the [hardhat-etherscan plugin](https://hardhat.org/plugins/nomiclabs-hardhat-etherscan.html) (requires **v3.0.0+).**
**npm**
```
npm install --save-dev @nomiclabs/hardhat-etherscan
```
**yarn**
```
yarn add --dev @nomiclabs/hardhat-etherscan
```
4. **Add plugin reference to config file**
Add the following statement to your `hardhat.config.js`.
Copy
```
require("@nomiclabs/hardhat-etherscan");
```
If using TypeScript, add this to your `hardhat.config.ts.` [More info on using typescript with hardhat available here](https://hardhat.org/guides/typescript.html#typescript-support).
```
import "@nomiclabs/hardhat-etherscan";
```
## **Config File**
Your basic [Hardhat config file](https://hardhat.org/config/) (`hardhat.config.js` or `hardhat.config.ts`) will be setup to support the network you are working on. In this example we use the Sokol test network and a `.js` file.
Here we add an RPC url without an API key, however some value is still required. You can use any arbitrary string. [More info](https://hardhat.org/plugins/nomiclabs-hardhat-etherscan.html#multiple-api-keys-and-alternative-block-explorers).
If you prefer, you can migrate to [hardhat-toolbox](https://hardhat.org/hardhat-runner/plugins/nomicfoundation-hardhat-toolbox) to use a plugin bundle.
```
import dotenv from "dotenv";
import { HardhatUserConfig } from "hardhat/config";
import "@nomicfoundation/hardhat-toolbox";
import "tsconfig-paths/register";
import "@openzeppelin/hardhat-upgrades";
/**
* Config dotenv first
*/
dotenv.config();
/**
* Default hardhat configs
*/
const config: HardhatUserConfig = {
solidity: {
compilers: [
{
version: "0.8.20",
settings: {
optimizer: {
enabled: true,
runs: 200,
},
},
},
],
},
};
/**
* Extract env vars
*/
const privateKey = process.env.PRIVATE_KEY || "";
/**
* If private key is available, attach network configs
*/
if (privateKey) {
config.networks = {
sei_arctic_1: {
url: "https://evm-rpc.arctic-1.seinetwork.io/",
chainId: 713715,
accounts: [privateKey],
gas: "auto",
gasPrice: "auto",
},
};
}
/**
* Load etherscan key
*/
const seitraceKey = process.env.SEITRACE_KEY || "";
if (seitraceKey) {
config.etherscan = {
apiKey: {
sei_arctic_1: seitraceKey,
},
customChains: [
{
network: "sei_arctic_1",
chainId: 713715,
urls: {
apiURL: "https://seitrace.com/arctic-1/api",
browserURL: "https://seitrace.com"
}
},
],
};
}
export default config;
```
apiURL:
* arctic-1: [https://seitrace.com/arctic-1/api](https://seitrace.com/arctic-1/api)
* pacific-1: [https://seitrace.com/pacific-1/api](https://seitrace.com/pacific-1/api)
* atlantic-2: [https://seitrace.com/atlantic-2/api](https://seitrace.com/atlantic-2/api)
Set up env. file
```
PRIVATE_KEY="4c1a9ffd2dce9ed5b5f464c6b6a38efceb051855d123c9e6aeec751c35762d91"
SEITRACE_KEY="can-be-any-string"
```
* PRIVATE\_KEY: Wallet private key
* SEITRACE\_KEY: You can also use a random string
## **Deploy and Verify**
**Deploy**
```
npx hardhat run .\scripts\\deploy.multicall.ts --network sei_arctic_1
```
**Verify**
```
npx hardhat verify --network sei_arctic_1 "Constructor argument"
```
**Example**
```
PS D:\verify-contract> npx hardhat verify --network sei_arctic_1 0xaa338AbfB92e7476596D4cCb98b29700BDcA2a6E "0xc99259dE8f9ec4cd443C0CF5D45D547c513E03be"
Successfully submitted source code for contract
contracts/VuNFT721.sol:VuSEI721 at 0xaa338AbfB92e7476596D4cCb98b29700BDcA2a6E
for verification on the block explorer. Waiting for verification result...
Successfully verified contract VuSEI721 on the block explorer.
https://seitrace.com/address/0xaa338AbfB92e7476596D4cCb98b29700BDcA2a6E#code
```
## **Confirm Verification on Seitrace**
