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DynamicSDK.instance.bitcoin.buildPsbt constructs an unsigned PSBT without broadcasting it. Use it when you need to inspect, modify, batch, or co-sign a transaction before sending. See What is a PSBT? in the overview for context.

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Example

import 'package:dynamic_sdk/dynamic_sdk.dart';

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

final unsignedPsbt = await sdk.bitcoin.buildPsbt(
  walletId: wallet.id,
  recipientAddress: 'bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh',
  amount: '10000',         // satoshis
  feePriority: 'medium',
);
print('Unsigned PSBT (base64): $unsignedPsbt');

​
Parameters

ParameterTypeDescription
walletIdStringThe id of a wallet whose chain == 'BTC'.
recipientAddressStringDestination address.
amountStringAmount in satoshis, encoded as a string to preserve precision.
feePriorityString?Fee tier: 'high', 'medium', or 'low'.

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Returns

Future<String> — the unsigned PSBT, base64-encoded. Pass it to signPsbt to sign, then to sendRawTransaction to broadcast.

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Build → sign → broadcast

final unsignedPsbt = await sdk.bitcoin.buildPsbt(
  walletId: wallet.id,
  recipientAddress: 'bc1q...',
  amount: '5000',
);

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

final txId = await sdk.bitcoin.sendRawTransaction(
  walletId: wallet.id,
  rawTransaction: signedPsbt,
);
print('Sent: $txId');