Overview

import {PrivyClient} from '@privy-io/node';

const privy = new PrivyClient({
  appId: process.env.PRIVY_APP_ID,
  appSecret: process.env.PRIVY_APP_SECRET
});

const wallet = await privy.wallets().create({chain_type: 'xrpl'});
// wallet.address: r-address (e.g. "rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh")
// wallet.public_key: 33-byte compressed secp256k1 pubkey, hex, no 0x prefix

import {PrivyClient} from '@privy-io/node';
import {Client as XrplClient, encodeForSigning, xrpToDrops} from 'xrpl';

const privy = new PrivyClient({
  appId: process.env.PRIVY_APP_ID,
  appSecret: process.env.PRIVY_APP_SECRET
});

const walletId = 'insert-wallet-id';
const walletAddress = 'insert-wallet-address';
const walletPublicKey = 'insert-wallet-public-key';

// 1. Connect to XRPL and build a transaction
const xrpl = new XrplClient('wss://s.altnet.rippletest.net:51233');
await xrpl.connect();

const prepared = await xrpl.autofill({
  TransactionType: 'Payment',
  Account: walletAddress,
  Destination: 'ra5nK24KXen9AHvsdFTKHSANinZseWnPcX',
  Amount: xrpToDrops('10')
});

// 2. Add SigningPubKey and encode with the signing prefix
const forSigning = {...prepared, SigningPubKey: walletPublicKey};
const prefixedHex = encodeForSigning(forSigning);

// 3. Sign via xrpl_signTransaction RPC
const {data} = await privy.wallets().rpc(walletId, {
  method: 'xrpl_signTransaction',
  params: {
    transaction: prefixedHex,
    encoding: 'hex'
  }
});

// 4. Submit the signed transaction blob
const result = await xrpl.submit(data.signed_transaction);
console.log('Result:', result.result.engine_result);

await xrpl.disconnect();

import {PrivyClient} from '@privy-io/node';
import {Signature} from '@noble/secp256k1';
import {createHash} from 'node:crypto';
import {encode, encodeForSigning} from 'xrpl';

const privy = new PrivyClient({
  appId: process.env.PRIVY_APP_ID,
  appSecret: process.env.PRIVY_APP_SECRET
});

// Compute the SHA-512Half of the signing-prefixed transaction
const forSigning = {...prepared, SigningPubKey: walletPublicKey};
const prefixedHex = encodeForSigning(forSigning);
const sha512Half = createHash('sha512')
  .update(Buffer.from(prefixedHex, 'hex'))
  .digest()
  .subarray(0, 32);

// Sign the hash with Privy
const {signature} = await privy.wallets().rawSign(walletId, {
  params: {
    hash: `0x${sha512Half.toString('hex')}`
  }
});

// Convert compact signature (r||s) to DER for XRPL's TxnSignature
const compactHex = signature.replace(/^0x/, '');
const derHex = Signature.fromCompact(compactHex).toDERHex();

// Attach the signature, encode the final blob, and submit
const signedTx = encode({...forSigning, TxnSignature: derHex});
const result = await xrpl.submit(signedTx);
console.log('Result:', result.result.engine_result);