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Integrate Embedded Wallets with the Astar zKyoto Testnet in React Native

While using the Embedded Wallets Mobile SDKs (formerly Web3Auth) in React Native, the private key is available in the SDK state. Use it with EVM libraries to derive accounts, sign, and make JSON-RPC calls to the Astar zKyoto testnet.

note

The SDKs are now branded as MetaMask Embedded Wallet SDKs (formerly Web3Auth Plug and Play SDKs). Package names and APIs remain Web3Auth (for example, Web3Auth React SDK), and code snippets may reference web3auth identifiers.

Installation​

To interact with an EVM blockchain in React Native, you can use any EIP1193 compatible package like web3.js, ethers.js etc.

In this reference, we're using ethers.js to demonstrate how to make blockchain calls using it with Web3Auth.

  • Install the ethers.js package using npm or yarn:
npm install @ethersproject/shims ethers
  • Import the packages and shims into your codebase:
// Import the required shims
import "@ethersproject/shims";

// Import the ethers library
import { ethers } from "ethers";
info

We have followed this guide to set up the ethers.js package in React Native.

Initializing Provider​

Using eip155 as chainNamespace while initializing web3auth will provide an EIP1193 compatible provider as web3auth.provider after successful authentication.

Getting the chainConfig​

const chainConfig = {
  chainNamespace: ChainNamespace.EIP155,
  chainId: '0x5C2359', // hex of 6038361
  rpcTarget: 'https://rpc.startale.com/astar-zkyoto',
  // Avoid using public rpcTarget in production.
  // Use services like Infura
  displayName: 'Astar zKyoto',
  blockExplorer: 'https://zkyoto.explorer.startale.com/',
  ticker: 'ETH',
  tickerName: 'ETH',
}

Initialize​

import * as WebBrowser from '@toruslabs/react-native-web-browser'
import EncryptedStorage from 'react-native-encrypted-storage'
import Web3Auth, { LOGIN_PROVIDER, WEB3AUTH_NETWORK } from '@web3auth/react-native-sdk'
import '@ethersproject/shims'
import { ethers } from 'ethers'
import { EthereumPrivateKeyProvider } from '@web3auth/ethereum-provider'

const [provider, setProvider] = useState<IProvider | null>(null)

const ethereumPrivateKeyProvider = new EthereumPrivateKeyProvider({
  config: {
    chainConfig,
  },
})

const web3auth = new Web3Auth(WebBrowser, EncryptedStorage, {
  clientId,
  network: WEB3AUTH_NETWORK.SAPPHIRE_MAINNET, // or other networks
})

await ethereumPrivateKeyProvider.setupProvider(web3auth.privKey)

setProvider(ethereumPrivateKeyProvider)

Get User Info​

You get the user information after a successful login is returned from the login method. The userInfo object contains the user information.

const info = web3auth.userInfo(); // User Information

Get Account​

// For ethers v5
// const ethersProvider = new ethers.providers.Web3Provider(this.provider);
const ethersProvider = new ethers.BrowserProvider(provider!);

// For ethers v5
// const signer = ethersProvider.getSigner();
const signer = await ethersProvider.getSigner();

// Get user's Ethereum public address
const address = signer.getAddress();
uiConsole(address);

Get Balance​

// For ethers v5
// const ethersProvider = new ethers.providers.Web3Provider(this.provider);
const ethersProvider = new ethers.BrowserProvider(provider!);

// For ethers v5
// const signer = ethersProvider.getSigner();
const signer = await ethersProvider.getSigner();

// Get user's Ethereum public address
const address = signer.getAddress();

// Get user's balance in ether
// For ethers v5
// const balance = ethers.utils.formatEther(
// await ethersProvider.getBalance(address) // Balance is in wei
// );
const balance = ethers.formatEther(
  await ethersProvider.getBalance(address), // Balance is in wei
);

Send Transaction​

const ethersProvider = ethers.getDefaultProvider(providerUrl);
const wallet = new ethers.Wallet(key, ethersProvider);

const destination = "0x40e1c367Eca34250cAF1bc8330E9EddfD403fC56";

// Convert 1 ether to wei
const amount = ethers.utils.parseEther("0.001");

// Submit transaction to the blockchain
const tx = await wallet.sendTransaction({
  to: destination,
  value: amount,
  maxPriorityFeePerGas: "5000000000", // Max priority fee per gas
  maxFeePerGas: "6000000000000", // Max fee per gas
});

Sign a message​

// For ethers v5
// const ethersProvider = new ethers.providers.Web3Provider(this.provider);
const ethersProvider = new ethers.BrowserProvider(provider!);

// For ethers v5
// const signer = ethersProvider.getSigner();
const signer = await ethersProvider.getSigner();
const originalMessage = "YOUR_MESSAGE";

// Sign the message
const signedMessage = await signer.signMessage(originalMessage);
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