broadcastBitcoinP2wpkhTransaction

Future<PortalBroadcastBitcoinP2wpkhTransactionResponse> broadcastBitcoinP2wpkhTransaction({
  required String chainId,
  required List<String> signatures,
  required String rawTxHex,
})

import 'package:portal_flutter/portal_flutter.dart';

final portal = Portal();

const chainId = 'bip122:000000000933ea01ad0ee984209779ba-p2wpkh'; // Bitcoin Testnet

// 1. Build the PSBT.
final built = await portal.buildBitcoinP2wpkhTransaction(
  chainId: chainId,
  to: 'tb1qw508d6qejxtdg4y5r3zarvary0c5xw7kxpjzsx',
  token: 'NATIVE',
  amount: '0.0001',
);

if (built.error != null) {
  throw Exception('Failed to build transaction: ${built.error}');
}

// 2. Sign every signature hash, in order.
final signatures = <String>[];
for (final hash in built.transaction.signatureHashes) {
  signatures.add(await portal.rawSign(chainId: chainId, message: hash));
}

// 3. Broadcast.
final broadcast = await portal.broadcastBitcoinP2wpkhTransaction(
  chainId: chainId,
  signatures: signatures,
  rawTxHex: built.transaction.rawTxHex,
);

print('Transaction hash: ${broadcast.txHash}');
print('Chain: ${broadcast.chainId}');

try {
  final broadcast = await portal.broadcastBitcoinP2wpkhTransaction(
    chainId: chainId,
    signatures: signatures,
    rawTxHex: built.transaction.rawTxHex,
  );

  print('Transaction hash: ${broadcast.txHash}');
} on PortalException catch (e) {
  print('Broadcast failed: ${e.code} - ${e.message}');
}