Sign a PSBT

Sign one or more Partially Signed Bitcoin Transactions (PSBTs).

DynamicSDK.instance.bitcoin.signPsbt signs a PSBT with the connected wallet. For batch signing, use signPsbts instead — same semantics, but takes a list of PSBT requests.

Sign a single PSBT

import 'package:dynamic_sdk/dynamic_sdk.dart';

final sdk = DynamicSDK.instance;
final wallet = sdk.wallets.userWallets.firstWhere(
  (w) => w.chain == 'BTC',
);

final signedPsbt = await sdk.bitcoin.signPsbt(
  walletId: wallet.id,
  request: {
    'unsignedPsbtBase64': unsignedPsbt,
  },
);
print('Signed PSBT: $signedPsbt');

Parameters

Parameter	Type	Description
walletId	String	The id of a wallet whose chain == 'BTC'.
request	Map<String, dynamic>	PSBT request. Must include unsignedPsbtBase64.

Returns

Future<String> — the signed PSBT, base64-encoded. Pass it to sendRawTransaction to broadcast.

Sign multiple PSBTs

Batch-sign in a single call when you have several PSBTs to authorize at once:

final signedPsbts = await sdk.bitcoin.signPsbts(
  walletId: wallet.id,
  requests: [
    {'unsignedPsbtBase64': psbt1},
    {'unsignedPsbtBase64': psbt2},
  ],
);
print('Signed ${signedPsbts.length} PSBTs');

Parameters

Parameter	Type	Description
walletId	String	The id of a wallet whose chain == 'BTC'.
requests	List<Map<String, dynamic>>	List of PSBT requests, each with unsignedPsbtBase64.

Returns

Future<List<String>> — base64-encoded signed PSBTs, in the same order as requests.