npm install @lazorkit/sdk-legacy @solana/web3.js

import { Connection } from '@solana/web3.js';
import { LazorKitClient, ed25519, session } from '@lazorkit/sdk-legacy';
import * as crypto from 'crypto';

const connection = new Connection('https://api.devnet.solana.com', 'confirmed');
const client = new LazorKitClient(connection);

import { Keypair } from '@solana/web3.js';

const ownerKp = Keypair.generate();

const { instructions, walletPda, vaultPda, authorityPda } = await client.createWallet({
  payer: payer.publicKey,
  userSeed: crypto.randomBytes(32),
  owner: {
    type: 'ed25519',
    pubkey: ownerKp.publicKey,
  },
});

const { instructions, walletPda, vaultPda, authorityPda } = await client.createWallet({
  payer: payer.publicKey,
  userSeed: crypto.randomBytes(32),
  owner: {
    type: 'secp256r1',
    credentialIdHash,     // 32-byte SHA256 of WebAuthn credential ID
    compressedPubkey,     // 33-byte compressed Secp256r1 public key
    rpId: 'your-app.com',
  },
});

import { SystemProgram } from '@solana/web3.js';

const { instructions } = await client.execute({
  payer: payer.publicKey,
  walletPda,
  signer: ed25519(ownerKp.publicKey),
  instructions: [
    SystemProgram.transfer({
      fromPubkey: vaultPda,
      toPubkey: recipient,
      lamports: 1_000_000n,
    }),
  ],
});

// Step 1: Compute the challenge
const prepared = await client.prepareExecute({
  payer: payer.publicKey,
  walletPda,
  secp256r1: { credentialIdHash, publicKeyBytes: compressedPubkey, authorityPda },
  instructions: [
    SystemProgram.transfer({ fromPubkey: vaultPda, toPubkey: recipient, lamports: 1_000_000n }),
  ],
});

// Step 2: Browser authenticator signs the challenge
const webauthnResponse = await getWebAuthnResponse(prepared.challenge, 'your-app.com', credentialId);

// Step 3: Build the transaction
const { instructions } = client.finalizeExecute(prepared, webauthnResponse);

const [wallet] = await client.findWalletsByAuthority(credentialIdHash);
// Returns: { walletPda, authorityPda, vaultPda, role, authorityType }

const { instructions } = await client.transferSol({
  payer: payer.publicKey,
  walletPda,
  signer: ed25519(ownerKp.publicKey),
  recipient,
  lamports: 500_000_000n,
});

import { PROGRAM_ID } from '@lazorkit/sdk-legacy';
// 4h3XoNReAgEcHVxcZ8sw2aufi9MTr7BbvYYjzjWDyDxS