Integrate Web3Auth with the StarkNet Blockchain
While using the Web3Auth Web SDK for a non EVM chain like StarkNet
you get a standard provider from which you can get the private key of the user. Using this private
key, you can use the corresponding libraries of the blockchain to make 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 methods here for getting you started quickly
on that.
This reference is for the Web
, however, you can use StarkNet on other Mobile and Gaming Platforms
as well. Please follow our reference for EVM Blockchains, and similarly
use StarkNet libraries that support the platforms to use the private key and make blockchain calls
accordingly.
Installation
- npm
- Yarn
- pnpm
- Bun
npm install --save web3 starknet elliptic bn.js @starkware-industries/starkware-crypto-utils
yarn add web3 starknet elliptic bn.js @starkware-industries/starkware-crypto-utils
pnpm add web3 starknet elliptic bn.js @starkware-industries/starkware-crypto-utils
bun add web3 starknet elliptic bn.js @starkware-industries/starkware-crypto-utils
Initializing Provider
Getting the chainConfig
- Mainnet
- Testnet
- Chain Namespace: other
- Chain ID: 0x1
- Public RPC URL: https://rpc.ethereum.org (Avoid using public rpcTarget in production)
- Display Name: StarkNet Mainnet
- Block Explorer Link: https://explorer.immutable.com
- Ticker: STRK
- Ticker Name: StarkNet
- Chain Namespace: other
- Chain ID: 0xaa36a7
- Public RPC URL: https://rpc.sepolia.org (Avoid using public rpcTarget in production)
- Display Name: StarkNet Testnet
- Block Explorer Link: https://sepolia.etherscan.io
- Ticker: STRK
- Ticker Name: StarkNet
Get Account and Key
Once a user logs in, the Web3Auth SDK returns a provider. Even though StarkNet is a layer 2 on
Ethereum, it is not EVM compatible. Hence to use it, one cannot use the native
EIP1193
provider that Web3Auth gives for EVM
blockchains. Hence we need to directly use the private key to make the calls here.
Using the function, web3auth.provider.request({method: "private_key"})
from Web3Auth provider, the
application can have access to the user's private key. However, we cannot use this key with StarkNet
EC Curve specific signing functions, hence, we first derive the Stark Key using the getStarkKey()
function.
On the underhood, it uses the starkwareCrypto.ec.keyFromPrivate()
function, where we pass our
Private key with the hex
argument since it is hex encoded. Further, we get the public key from
this using the starkwareCrypto.ec.keyFromPublic()
function, and we take its X-coordinate using
.pub.getX()
which is our starkKey
. We use this starkKey
on StarkNet transactions.
For the deployAccount()
, we use the file ArgentAccount.json
which gives us the ABI of the
compiled contract. We use that contract in Starknet's defaultProvider.deployContract()
function to
deploy the contract.
Get ArgentAccount.json from this gist.
import starkwareCrypto from "@starkware-industries/starkware-crypto-utils";
import { ec as elliptic } from "elliptic";
/*
Use code from the above Initializing Provider here
*/
// web3authProvider is web3auth.provider from above
const privateKey = await web3authProvider.request({ method: "private_key" });
const keyPair = starkwareCrypto.ec.keyFromPrivate(privateKey, "hex");
// get the account address from the public key
const account = starkwareCrypto.ec.keyFromPublic(keyPair.getPublic(true, "hex"), "hex");
// Use this key for the StarkNet transactions
const startKey = account.pub.getX().toString("hex");
Deploy Account
import { AddTransactionResponse, defaultProvider } from "starknet";
import starkwareCrypto from "@starkware-industries/starkware-crypto-utils";
import { ec as elliptic } from "elliptic";
import CompiledAccountContractAbi from "./ArgentAccount.json";
/*
Use code from the above Initializing Provider here
*/
// web3authProvider is web3auth.provider from above
const privateKey = await web3authProvider.request({ method: "private_key" });
const keyPair = starkwareCrypto.ec.keyFromPrivate(privateKey, "hex");
// get the account address from the public key
const account = starkwareCrypto.ec.keyFromPublic(keyPair.getPublic(true, "hex"), "hex");
const contract = JSON.parse(JSON.stringify(CompiledAccountContractAbi));
const response = await defaultProvider.deployContract({ contract });