Litecoin

This article describes the process of completing a Litcoin transaction through the SDK.

Support List

Supports transactions for most Bitcoin-like cryptocurrencies.

• Bitcoin Cash
• Litecoin
• Doge
• Kaspa

GsWalletBTCSDK

The GsWalletBTCSDK class mainly implements the following functions:

• Construct Bitcoin-like transactions.
• Parse signature information.

class GsWalletBTCSDK {
 
  static UR generateSignRequest({
    String? uuid,
    required String hexData,
    required GsplDataType dataType,
    List<Map<String, dynamic>>? inputs,
    Map<String, dynamic>? change,
    required String path,
    required String xfp,
    String? origin,
  })；

  static Map<String, dynamic> parseSignature(UR ur);

}

generateSignRequest

static UR generateSignRequest({
  String? uuid,
  required String hexData,
  required GsplDataType dataType,
  List<Map<String, dynamic>>? inputs,
  Map<String, dynamic>? change,
  required String path,
  required String xfp,
  String? origin,
})；

Input parameters

• uuid: String optional Representing the unique ID of a transaction

• hexData: String required Unsigned-transaction data, it's serialized hex for a Bitcoin-like transaction

• dataType: GsplDataType required Transaction type

• path: String required BIP32 derivation path for from-address of the transaction

• inputs: Map optional Transaction input section, which includes the following optional attributes: path, amount, signature, signHashType, address.

• change: Map optional Change section, which includes the following optional attributes: path, amount, signature, signHashType, address.

• xfp: String required MasterFingerprint, used as a unique wallet ID

• origin: String optional Notes for transaction, usually source of the request

parseSignature

static Map<String, dynamic> parseSignature(UR ur);

Returns

• uuid: Uint8List transaction ID.

• gspl: CryptoGspl Complete transaction content.

• origin: String usually "GsWallet".

Example

Construct transaction

import 'package:gs_ur_dart/gs_ur_dart.dart';

UR ur = GsWalletBTCSDK.generateSignRequest(
  uuid: "cf55cae0-8d24-11ef-90ac-6dae386eaee6",
  hexData:
      "0200000002c4d65606a1cb6e6d4c225af6c632d0155765c997789fbcdf91376295d924c4780100000000ffffffff538ee4444e981be55b49836f982813d771ff4cfc66cb0c587d3f8be1a7529ce40100000000ffffffff0109444304000000001976a914e274b8b609ea3d6ef60c90d84fb8f2e8445cdb5788ac00000000",
  dataType: GsplDataType.transaction,
  path: "m/44'/2'/0'/0/0",
  inputs: [
    {
      "path": "m/44'/2'/0'/0/0",
      "amount": 63517873,
      "signature": null,
      "signhashType": 1
    },
    {
      "path": "m/44'/2'/0'/0/0",
      "amount": 8006507,
      "signature": null,
      "signhashType": 1
    }
  ],
  change: null,
  xfp: '27c3831f',
  origin: null);

final UREncoder urEncoder = UREncoder(ur);
String _currentQR = urEncoder.nextPart();
emit(_AnimatedQRDataState(_currentQR));
timer = Timer.periodic(const Duration(milliseconds: 250), (_) {
  _currentQR = urEncoder.nextPart();
  emit(_AnimatedQRDataState(_currentQR));
});

Parse signature

import 'package:gs_ur_dart/gs_ur_dart.dart';

typedef SuccessCallback = void Function(UR);
final SuccessCallback onSuccess;

final QRViewController controller；

controller.scannedDataStream.listen((event) {
  URDecoder urDecoder = URDecoder();
  urDecoder.receivePart(event.code);
  double progress = urDecoder.getProgress();
  if (urDecoder.isComplete()) {
    final UR result = urDecoder.resultUR();
    if (!succeed) {
      onSuccess(result);
      succeed = true;
    }
  }
});

onSuccess(UR ur){
  final ltcSigned = GsWalletBTCSDK.parseSignature(ur);
}

// ltcSigned: {
//      "uuid": [207, 85, 202, 224, 141, 36, 17, 239, 144, 172, 109, 174, 56, 110, 174, 230],
//      "gspl":< Instance of CryptoGspl>,
//      "origin":"GSWALLET",
//    };