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Integrate Embedded Wallets with the Hedera Blockchain in JavaScript

While using the Web3Auth React SDK, you get access to the Web3Auth provider. You can pair it up with the libraries like ethers.js, viem etc. to make EVM based blockchain calls, like getting user's account, fetch balance, sign transaction, send transaction, read from and write to the smart contract, etc. We have highlighted a few here for getting you started quickly on that.

Chain details for Hedera​

For VanillaJS, Angular and other frameworks​

Installation​

To interact with the blockchain, you can use either the viem or ethers.js library with Web3Auth.

npm install --save viem

Initializing provider​

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

Initializing and instantiating the Embedded Wallets SDK​

import { Web3Auth, WEB3AUTH_NETWORK } from '@web3auth/modal'

const web3AuthOptions: Web3AuthOptions = {
  clientId,
  web3AuthNetwork: WEB3AUTH_NETWORK.SAPPHIRE_MAINNET,
}

Getting the Embedded Wallets provider​

After initializing Embedded Wallets, the next step is to initialize the provider and use it for your operations.

// Initialize for PnP Web SDK
await web3auth.init()

// Trigger the login
await web3auth.connect()
// await web3auth.connectTo(); // For custom flow

// Get the provider
const provider = web3auth.provider

// Continue using the `provider`

Get account and balance​

const publicClient = createPublicClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

const walletClient = createWalletClient({
  chain: mainnet,
  transport: custom(this.provider),
})

// Get user's Ethereum public address
const address = await walletClient.getAddresses()

// Get user's balance in ether
const balance = await publicClient.getBalance({ address: address[0] })

Send transaction​

/*
  Use code from the above Initializing Provider here
*/

const publicClient = createPublicClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

const walletClient = createWalletClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

// data for the transaction
const destination = '<ADDRESS>'
const amount = parseEther('0.0001')
const address = await this.getAccounts()

const address = await walletClient.getAddresses()

// Submit transaction to the blockchain
const hash = await walletClient.sendTransaction({
  account: address[0],
  to: destination,
  value: amount,
})

const receipt = await publicClient.waitForTransactionReceipt({ hash })

Send transaction​

/*
  Use code from the above Initializing Provider here
*/

const publicClient = createPublicClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

const walletClient = createWalletClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

// data for the transaction
const destination = '<ADDRESS>'
const amount = parseEther('0.0001')
const address = await this.getAccounts()

const address = await walletClient.getAddresses()

// Submit transaction to the blockchain
const hash = await walletClient.sendTransaction({
  account: address[0],
  to: destination,
  value: amount,
})

const receipt = await publicClient.waitForTransactionReceipt({ hash })

Sign message​

Personal sign​

/*
  Use code from the above Initializing Provider here
*/

const publicClient = createPublicClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

const walletClient = createWalletClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

// data for signing
const address = await walletClient.getAddresses()
const originalMessage = 'YOUR_MESSAGE'

// Sign the message
const hash = await walletClient.signMessage({
  account: address[0],
  message: originalMessage,
})

Sign typed data v4​

// SignTypedData in viem
// https://viem.sh/docs/actions/wallet/signTypedData

/*
  Use code from the above Initializing Provider here
*/

const walletClient = createWalletClient({
  chain: mainnet,
  transport: custom(this.provider),
})

const address = await walletClient.getAddresses()

const signature = await walletClient.signTypedData({
  account: address[0],
  domain: {
    name: 'Ether Mail',
    version: '1',
    chainId: 1,
    verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC',
  },
  types: {
    Person: [
      { name: 'name', type: 'string' },
      { name: 'wallet', type: 'address' },
    ],
    Mail: [
      { name: 'from', type: 'Person' },
      { name: 'to', type: 'Person' },
      { name: 'contents', type: 'string' },
    ],
  },
  primaryType: 'Mail',
  message: {
    from: {
      name: 'Cow',
      wallet: '0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826',
    },
    to: {
      name: 'Bob',
      wallet: '0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB',
    },
    contents: 'Hello, Bob!',
  },
})

Smart contract​

Solidity contract​

In this example, we'll be demonstrating how to use Web3Auth with web3.js or ethers.js to interact with Solidity smart contracts. The simple Hello World contract allows anyone to read and write a message to it.

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;

contract HelloWorld {

  string public message;

  constructor(string memory initMessage) {
    message = initMessage;
  }

  function update(string memory newMessage) public {
    message = newMessage;
  }
}

Deploy contract​

/*
  Use code from the above Initializing Provider here
*/
const publicClient = createPublicClient({
  chain: this.getViewChain(),
  transport: custom(this.provider),
})

const walletClient = createWalletClient({
  chain: mainnet,
  transport: custom(this.provider),
})

const contractABI = [
  {
    inputs: [{ internalType: 'string', name: 'initMessage', type: 'string' }],
    stateMutability: 'nonpayable',
    type: 'constructor',
  },
  {
    inputs: [],
    name: 'message',
    outputs: [{ internalType: 'string', name: '', type: 'string' }],
    stateMutability: 'view',
    type: 'function',
  },
  {
    inputs: [{ internalType: 'string', name: 'newMessage', type: 'string' }],
    name: 'update',
    outputs: [],
    stateMutability: 'nonpayable',
    type: 'function',
  },
]
const contractByteCode =
  '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const [account] = await walletClient.getAddresses()
const hash = await walletClient.deployContract({
  abi: this.contractABI,
  account,
  bytecode: this.contractByteCode,
  args: ['Hello World!'],
})

const receipt = await publicClient.waitForTransactionReceipt({ hash })

const deployedContractAddress = receipt.contractAddress

Read from contract​

/*
  Use code from the above Initializing Provider here
*/

const contractABI = [
  {
    inputs: [{ internalType: 'string', name: 'initMessage', type: 'string' }],
    stateMutability: 'nonpayable',
    type: 'constructor',
  },
  {
    inputs: [],
    name: 'message',
    outputs: [{ internalType: 'string', name: '', type: 'string' }],
    stateMutability: 'view',
    type: 'function',
  },
  {
    inputs: [{ internalType: 'string', name: 'newMessage', type: 'string' }],
    name: 'update',
    outputs: [],
    stateMutability: 'nonpayable',
    type: 'function',
  },
]

const publicClient = createPublicClient({
  chain: mainnet, // for mainnet
  transport: custom(this.provider),
})

const contractAddress = '0x8AA6820B3F197384874fAdb355361758258cb981' // On Sepolia, replace with your contract address

// Read message from smart contract
const message = await publicClient.readContract({
  address: contractAddress,
  abi: contractABI,
  functionName: 'message',
})

Write to contract​

/*
  Use code from the above Initializing Provider here
*/

const contractABI = [
  {
    inputs: [{ internalType: 'string', name: 'initMessage', type: 'string' }],
    stateMutability: 'nonpayable',
    type: 'constructor',
  },
  {
    inputs: [],
    name: 'message',
    outputs: [{ internalType: 'string', name: '', type: 'string' }],
    stateMutability: 'view',
    type: 'function',
  },
  {
    inputs: [{ internalType: 'string', name: 'newMessage', type: 'string' }],
    name: 'update',
    outputs: [],
    stateMutability: 'nonpayable',
    type: 'function',
  },
]
const publicClient = createPublicClient({
  chain: mainnet,
  transport: custom(this.provider),
})

const walletClient = createWalletClient({
  chain: mainnet,
  transport: custom(this.provider),
})

const contractAddress = '0x8AA6820B3F197384874fAdb355361758258cb981' // On Sepolia, replace with your contract address
address = await walletClient.getAddresses()

// Submit transaction to the blockchain
const hash = await walletClient.writeContract({
  account: address[0],
  address: contractAddress,
  abi: JSON.parse(JSON.stringify(contractABI)),
  functionName: 'update',
  args: ['NEW_MESSAGE'],
})

// Send transaction to smart contract to update message
const receipt = await publicClient.waitForTransactionReceipt({ hash })

Fetch user's private key​

private_key is used to fetch the private key of the logged in user. It is only available for in-app adapters like auth.

//Assuming user is already logged in.
async getPrivateKey() {
  const privateKey = await web3auth.provider.request({
    method: "private_key"
  });
  //Do something with privateKey
}
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