feat: electrum worker types

cw_bitcoin/lib/electrum_wallet.dart

@@ -4,7 +4,9 @@ import 'dart:io';
 import 'dart:isolate';
 
 import 'package:bitcoin_base/bitcoin_base.dart';
-import 'package:cw_bitcoin/electrum_worker.dart';
+import 'package:cw_bitcoin/electrum_worker/electrum_worker.dart';
+import 'package:cw_bitcoin/electrum_worker/electrum_worker_methods.dart';
+import 'package:cw_bitcoin/electrum_worker/methods/methods.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:blockchain_utils/blockchain_utils.dart';
 import 'package:collection/collection.dart';
@@ -104,35 +106,55 @@ abstract class ElectrumWalletBase
     sharedPrefs.complete(SharedPreferences.getInstance());
   }
 
-  void _handleWorkerResponse(dynamic response) {
-    print('Main: worker response: $response');
+  @action
+  void _handleWorkerResponse(dynamic message) {
+    print('Main: received message: $message');
 
-    final workerResponse = ElectrumWorkerResponse.fromJson(
-      jsonDecode(response.toString()) as Map<String, dynamic>,
-    );
-
-    if (workerResponse.error != null) {
-      // Handle error
-      print('Worker error: ${workerResponse.error}');
-      return;
+    Map<String, dynamic> messageJson;
+    if (message is String) {
+      messageJson = jsonDecode(message) as Map<String, dynamic>;
+    } else {
+      messageJson = message as Map<String, dynamic>;
     }
+    final workerMethod = messageJson['method'] as String;
 
-    switch (workerResponse.method) {
-      case 'connectionStatus':
-        final status = workerResponse.data as String;
-        final connectionStatus = ConnectionStatus.values.firstWhere(
-          (e) => e.toString() == status,
-        );
-        _onConnectionStatusChange(connectionStatus);
+    // if (workerResponse.error != null) {
+    //   print('Worker error: ${workerResponse.error}');
+
+    //   switch (workerResponse.method) {
+    //     // case 'connectionStatus':
+    //     //   final status = ConnectionStatus.values.firstWhere(
+    //     //     (e) => e.toString() == workerResponse.error,
+    //     //   );
+    //     //   _onConnectionStatusChange(status);
+    //     //   break;
+    //     // case 'fetchBalances':
+    //     //   // Update the balance state
+    //     //   // this.balance[currency] = balance!;
+    //     //   break;
+    //     case 'blockchain.headers.subscribe':
+    //       _chainTipListenerOn = false;
+    //       break;
+    //   }
+    //   return;
+    // }
+
+    switch (workerMethod) {
+      case ElectrumWorkerMethods.connectionMethod:
+        final response = ElectrumWorkerConnectionResponse.fromJson(messageJson);
+        _onConnectionStatusChange(response.result);
         break;
-      case 'fetchBalances':
-        final balance = ElectrumBalance.fromJSON(
-          jsonDecode(workerResponse.data.toString()).toString(),
-        );
+      case ElectrumRequestMethods.headersSubscribeMethod:
+        final response = ElectrumWorkerHeadersSubscribeResponse.fromJson(messageJson);
+        onHeadersResponse(response.result);
+        break;
+      // case 'fetchBalances':
+      // final balance = ElectrumBalance.fromJSON(
+      //   jsonDecode(workerResponse.data.toString()).toString(),
+      // );
       // Update the balance state
       // this.balance[currency] = balance!;
-        break;
-      // Handle other responses...
+      // break;
     }
   }
 
@@ -301,19 +323,13 @@ abstract class ElectrumWalletBase
 
       syncStatus = SynchronizingSyncStatus();
 
-      // await subscribeForHeaders();
-      // await subscribeForUpdates();
+      await subscribeForHeaders();
+      await subscribeForUpdates();
 
       // await updateTransactions();
       // await updateAllUnspents();
       // await updateBalance();
       // await updateFeeRates();
-      workerSendPort?.send(
-        ElectrumWorkerMessage(
-          method: 'blockchain.scripthash.get_balance',
-          params: {'scriptHash': scriptHashes.first},
-        ).toJson(),
-      );
 
       _updateFeeRateTimer ??=
           Timer.periodic(const Duration(seconds: 5), (timer) async => await updateFeeRates());
@@ -439,10 +455,7 @@ abstract class ElectrumWalletBase
         if (message is SendPort) {
           workerSendPort = message;
           workerSendPort!.send(
-            ElectrumWorkerMessage(
-              method: 'connect',
-              params: {'uri': node.uri.toString()},
-            ).toJson(),
+            ElectrumWorkerConnectionRequest(uri: node.uri).toJson(),
           );
         } else {
           _handleWorkerResponse(message);
@@ -1790,25 +1803,17 @@ abstract class ElectrumWalletBase
       (address) => !scripthashesListening.contains(address.scriptHash),
     );
 
-    await Future.wait(unsubscribedScriptHashes.map((addressRecord) async {
-      final scripthash = addressRecord.scriptHash;
-      final listener = await electrumClient2!.subscribe(
-        ElectrumScriptHashSubscribe(scriptHash: scripthash),
-      );
-
-      if (listener != null) {
-        scripthashesListening.add(scripthash);
-
-        // https://electrumx.readthedocs.io/en/latest/protocol-basics.html#status
-        // The status of the script hash is the hash of the tx history, or null if the string is empty because there are no transactions
-        listener((status) async {
-          print("status: $status");
-
-          await _fetchAddressHistory(addressRecord);
-          await updateUnspentsForAddress(addressRecord);
+    Map<String, String> scripthashByAddress = {};
+    List<String> scriptHashesList = [];
+    walletAddresses.allAddresses.forEach((addressRecord) {
+      scripthashByAddress[addressRecord.address] = addressRecord.scriptHash;
+      scriptHashesList.add(addressRecord.scriptHash);
     });
-      }
-    }));
+
+    workerSendPort!.send(
+      ElectrumWorkerScripthashesSubscribeRequest(scripthashByAddress: scripthashByAddress).toJson(),
+    );
+    scripthashesListening.addAll(scriptHashesList);
   }
 
   @action
@@ -1928,11 +1933,8 @@ abstract class ElectrumWalletBase
   Future<void> subscribeForHeaders() async {
     if (_chainTipListenerOn) return;
 
-    final listener = electrumClient2!.subscribe(ElectrumHeaderSubscribe());
-    if (listener == null) return;
-
+    workerSendPort!.send(ElectrumWorkerHeadersSubscribeRequest().toJson());
     _chainTipListenerOn = true;
-    listener(onHeadersResponse);
   }
 
   @action

cw_bitcoin/lib/electrum_worker.dart

@@ -3,55 +3,9 @@ import 'dart:convert';
 import 'dart:isolate';
 
 import 'package:bitcoin_base/bitcoin_base.dart';
-import 'package:cw_bitcoin/electrum_balance.dart';
-
-class ElectrumWorkerMessage {
-  final String method;
-  final Map<String, dynamic> params;
-
-  ElectrumWorkerMessage({
-    required this.method,
-    required this.params,
-  });
-
-  Map<String, dynamic> toJson() => {
-        'method': method,
-        'params': params,
-      };
-
-  factory ElectrumWorkerMessage.fromJson(Map<String, dynamic> json) {
-    return ElectrumWorkerMessage(
-      method: json['method'] as String,
-      params: json['params'] as Map<String, dynamic>,
-    );
-  }
-}
-
-class ElectrumWorkerResponse {
-  final String method;
-  final dynamic data;
-  final String? error;
-
-  ElectrumWorkerResponse({
-    required this.method,
-    required this.data,
-    this.error,
-  });
-
-  Map<String, dynamic> toJson() => {
-        'method': method,
-        'data': data,
-        'error': error,
-      };
-
-  factory ElectrumWorkerResponse.fromJson(Map<String, dynamic> json) {
-    return ElectrumWorkerResponse(
-      method: json['method'] as String,
-      data: json['data'],
-      error: json['error'] as String?,
-    );
-  }
-}
+import 'package:cw_bitcoin/electrum_worker/electrum_worker_methods.dart';
+// import 'package:cw_bitcoin/electrum_balance.dart';
+import 'package:cw_bitcoin/electrum_worker/electrum_worker_params.dart';
 
 class ElectrumWorker {
   final SendPort sendPort;
@@ -69,33 +23,36 @@ class ElectrumWorker {
     receivePort.listen(worker.handleMessage);
   }
 
-  Future<void> _handleConnect({
-    required Uri uri,
-  }) async {
-    _electrumClient = ElectrumApiProvider(
-      await ElectrumTCPService.connect(
-        uri,
-        onConnectionStatusChange: (status) {
-          _sendResponse('connectionStatus', status.toString());
-        },
-        defaultRequestTimeOut: const Duration(seconds: 5),
-        connectionTimeOut: const Duration(seconds: 5),
-      ),
-    );
+  void _sendResponse(ElectrumWorkerResponse response) {
+    sendPort.send(jsonEncode(response.toJson()));
+  }
+
+  void _sendError(ElectrumWorkerErrorResponse response) {
+    sendPort.send(jsonEncode(response.toJson()));
   }
 
   void handleMessage(dynamic message) async {
-    try {
-      final workerMessage = ElectrumWorkerMessage.fromJson(message as Map<String, dynamic>);
+    print("Worker: received message: $message");
 
-      switch (workerMessage.method) {
-        case 'connect':
-          final uri = Uri.parse(workerMessage.params['uri'] as String);
-          await _handleConnect(uri: uri);
-          break;
-        case 'blockchain.scripthash.get_balance':
-          await _handleGetBalance(workerMessage);
+    try {
+      Map<String, dynamic> messageJson;
+      if (message is String) {
+        messageJson = jsonDecode(message) as Map<String, dynamic>;
+      } else {
+        messageJson = message as Map<String, dynamic>;
+      }
+      final workerMethod = messageJson['method'] as String;
+
+      switch (workerMethod) {
+        case ElectrumWorkerMethods.connectionMethod:
+          await _handleConnect(ElectrumWorkerConnectRequest.fromJson(messageJson));
           break;
+        // case 'blockchain.headers.subscribe':
+        //   await _handleHeadersSubscribe();
+        //   break;
+        // case 'blockchain.scripthash.get_balance':
+        //   await _handleGetBalance(message);
+        //   break;
         case 'blockchain.scripthash.get_history':
           // await _handleGetHistory(workerMessage);
           break;
@@ -103,51 +60,59 @@ class ElectrumWorker {
           // await _handleListUnspent(workerMessage);
           break;
         // Add other method handlers here
-        default:
-          _sendError(workerMessage.method, 'Unsupported method: ${workerMessage.method}');
+        // default:
+        //   _sendError(workerMethod, 'Unsupported method: ${workerMessage.method}');
       }
     } catch (e, s) {
       print(s);
-      _sendError('unknown', e.toString());
+      _sendError(ElectrumWorkerErrorResponse(error: e.toString()));
     }
   }
 
-  void _sendResponse(String method, dynamic data) {
-    final response = ElectrumWorkerResponse(
-      method: method,
-      data: data,
+  Future<void> _handleConnect(ElectrumWorkerConnectRequest request) async {
+    _electrumClient = ElectrumApiProvider(
+      await ElectrumTCPService.connect(
+        request.uri,
+        onConnectionStatusChange: (status) {
+          _sendResponse(ElectrumWorkerConnectResponse(status: status.toString()));
+        },
+        defaultRequestTimeOut: const Duration(seconds: 5),
+        connectionTimeOut: const Duration(seconds: 5),
+      ),
     );
-    sendPort.send(jsonEncode(response.toJson()));
   }
 
-  void _sendError(String method, String error) {
-    final response = ElectrumWorkerResponse(
-      method: method,
-      data: null,
-      error: error,
-    );
-    sendPort.send(jsonEncode(response.toJson()));
-  }
+  // Future<void> _handleHeadersSubscribe() async {
+  //   final listener = _electrumClient!.subscribe(ElectrumHeaderSubscribe());
+  //   if (listener == null) {
+  //     _sendError('blockchain.headers.subscribe', 'Failed to subscribe');
+  //     return;
+  //   }
 
-  Future<void> _handleGetBalance(ElectrumWorkerMessage message) async {
-    try {
-      final scriptHash = message.params['scriptHash'] as String;
-      final result = await _electrumClient!.request(
-        ElectrumGetScriptHashBalance(scriptHash: scriptHash),
-      );
+  //   listener((event) {
+  //     _sendResponse('blockchain.headers.subscribe', event);
+  //   });
+  // }
 
-      final balance = ElectrumBalance(
-        confirmed: result['confirmed'] as int? ?? 0,
-        unconfirmed: result['unconfirmed'] as int? ?? 0,
-        frozen: 0,
-      );
+  // Future<void> _handleGetBalance(ElectrumWorkerRequest message) async {
+  //   try {
+  //     final scriptHash = message.params['scriptHash'] as String;
+  //     final result = await _electrumClient!.request(
+  //       ElectrumGetScriptHashBalance(scriptHash: scriptHash),
+  //     );
 
-      _sendResponse(message.method, balance.toJSON());
-    } catch (e, s) {
-      print(s);
-      _sendError(message.method, e.toString());
-    }
-  }
+  //     final balance = ElectrumBalance(
+  //       confirmed: result['confirmed'] as int? ?? 0,
+  //       unconfirmed: result['unconfirmed'] as int? ?? 0,
+  //       frozen: 0,
+  //     );
+
+  //     _sendResponse(message.method, balance.toJSON());
+  //   } catch (e, s) {
+  //     print(s);
+  //     _sendError(message.method, e.toString());
+  //   }
+  // }
 
   // Future<void> _handleGetHistory(ElectrumWorkerMessage message) async {
   //   try {

cw_bitcoin/lib/electrum_worker/electrum_worker.dart

@@ -0,0 +1,171 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:isolate';
+
+import 'package:bitcoin_base/bitcoin_base.dart';
+import 'package:cw_bitcoin/electrum_worker/electrum_worker_methods.dart';
+// import 'package:cw_bitcoin/electrum_balance.dart';
+import 'package:cw_bitcoin/electrum_worker/electrum_worker_params.dart';
+import 'package:cw_bitcoin/electrum_worker/methods/methods.dart';
+
+class ElectrumWorker {
+  final SendPort sendPort;
+  ElectrumApiProvider? _electrumClient;
+
+  ElectrumWorker._(this.sendPort, {ElectrumApiProvider? electrumClient})
+      : _electrumClient = electrumClient;
+
+  static void run(SendPort sendPort) {
+    final worker = ElectrumWorker._(sendPort);
+    final receivePort = ReceivePort();
+
+    sendPort.send(receivePort.sendPort);
+
+    receivePort.listen(worker.handleMessage);
+  }
+
+  void _sendResponse<T, U>(ElectrumWorkerResponse<T, U> response) {
+    sendPort.send(jsonEncode(response.toJson()));
+  }
+
+  void _sendError(ElectrumWorkerErrorResponse response) {
+    sendPort.send(jsonEncode(response.toJson()));
+  }
+
+  void handleMessage(dynamic message) async {
+    print("Worker: received message: $message");
+
+    try {
+      Map<String, dynamic> messageJson;
+      if (message is String) {
+        messageJson = jsonDecode(message) as Map<String, dynamic>;
+      } else {
+        messageJson = message as Map<String, dynamic>;
+      }
+      final workerMethod = messageJson['method'] as String;
+
+      switch (workerMethod) {
+        case ElectrumWorkerMethods.connectionMethod:
+          await _handleConnect(
+            ElectrumWorkerConnectionRequest.fromJson(messageJson),
+          );
+          break;
+        case ElectrumRequestMethods.headersSubscribeMethod:
+          await _handleHeadersSubscribe();
+          break;
+        case ElectrumRequestMethods.scripthashesSubscribeMethod:
+          await _handleScriphashesSubscribe(
+            ElectrumWorkerScripthashesSubscribeRequest.fromJson(messageJson),
+          );
+          break;
+        // case 'blockchain.scripthash.get_balance':
+        //   await _handleGetBalance(message);
+        //   break;
+        case 'blockchain.scripthash.get_history':
+          // await _handleGetHistory(workerMessage);
+          break;
+        case 'blockchain.scripthash.listunspent':
+          // await _handleListUnspent(workerMessage);
+          break;
+        // Add other method handlers here
+        // default:
+        //   _sendError(workerMethod, 'Unsupported method: ${workerMessage.method}');
+      }
+    } catch (e, s) {
+      print(s);
+      _sendError(ElectrumWorkerErrorResponse(error: e.toString()));
+    }
+  }
+
+  Future<void> _handleConnect(ElectrumWorkerConnectionRequest request) async {
+    _electrumClient = ElectrumApiProvider(
+      await ElectrumTCPService.connect(
+        request.uri,
+        onConnectionStatusChange: (status) {
+          _sendResponse(ElectrumWorkerConnectionResponse(status: status));
+        },
+        defaultRequestTimeOut: const Duration(seconds: 5),
+        connectionTimeOut: const Duration(seconds: 5),
+      ),
+    );
+  }
+
+  Future<void> _handleHeadersSubscribe() async {
+    final listener = _electrumClient!.subscribe(ElectrumHeaderSubscribe());
+    if (listener == null) {
+      _sendError(ElectrumWorkerHeadersSubscribeError(error: 'Failed to subscribe'));
+      return;
+    }
+
+    listener((event) {
+      _sendResponse(ElectrumWorkerHeadersSubscribeResponse(result: event));
+    });
+  }
+
+  Future<void> _handleScriphashesSubscribe(
+    ElectrumWorkerScripthashesSubscribeRequest request,
+  ) async {
+    await Future.wait(request.scripthashByAddress.entries.map((entry) async {
+      final address = entry.key;
+      final scripthash = entry.value;
+      final listener = await _electrumClient!.subscribe(
+        ElectrumScriptHashSubscribe(scriptHash: scripthash),
+      );
+
+      if (listener == null) {
+        _sendError(ElectrumWorkerScripthashesSubscribeError(error: 'Failed to subscribe'));
+        return;
+      }
+
+      // https://electrumx.readthedocs.io/en/latest/protocol-basics.html#status
+      // The status of the script hash is the hash of the tx history, or null if the string is empty because there are no transactions
+      listener((status) async {
+        print("status: $status");
+
+        _sendResponse(ElectrumWorkerScripthashesSubscribeResponse(
+          result: {address: status},
+        ));
+      });
+    }));
+  }
+
+  // Future<void> _handleGetBalance(ElectrumWorkerRequest message) async {
+  //   try {
+  //     final scriptHash = message.params['scriptHash'] as String;
+  //     final result = await _electrumClient!.request(
+  //       ElectrumGetScriptHashBalance(scriptHash: scriptHash),
+  //     );
+
+  //     final balance = ElectrumBalance(
+  //       confirmed: result['confirmed'] as int? ?? 0,
+  //       unconfirmed: result['unconfirmed'] as int? ?? 0,
+  //       frozen: 0,
+  //     );
+
+  //     _sendResponse(message.method, balance.toJSON());
+  //   } catch (e, s) {
+  //     print(s);
+  //     _sendError(message.method, e.toString());
+  //   }
+  // }
+
+  // Future<void> _handleGetHistory(ElectrumWorkerMessage message) async {
+  //   try {
+  //     final scriptHash = message.params['scriptHash'] as String;
+  //     final result = await electrumClient.getHistory(scriptHash);
+  //     _sendResponse(message.method, jsonEncode(result));
+  //   } catch (e) {
+  //     _sendError(message.method, e.toString());
+  //   }
+  // }
+
+  // Future<void> _handleListUnspent(ElectrumWorkerMessage message) async {
+  //   try {
+  //     final scriptHash = message.params['scriptHash'] as String;
+  //     final result = await electrumClient.listUnspent(scriptHash);
+  //     _sendResponse(message.method, jsonEncode(result));
+  //   } catch (e) {
+  //     _sendError(message.method, e.toString());
+  //   }
+  // }
+}

cw_bitcoin/lib/electrum_worker/electrum_worker_methods.dart

@@ -0,0 +1,15 @@
+class ElectrumWorkerMethods {
+  const ElectrumWorkerMethods._(this.method);
+  final String method;
+
+  static const String connectionMethod = "connection";
+  static const String unknownMethod = "unknown";
+
+  static const ElectrumWorkerMethods connect = ElectrumWorkerMethods._(connectionMethod);
+  static const ElectrumWorkerMethods unknown = ElectrumWorkerMethods._(unknownMethod);
+
+  @override
+  String toString() {
+    return method;
+  }
+}

cw_bitcoin/lib/electrum_worker/electrum_worker_params.dart

@@ -0,0 +1,45 @@
+// import 'dart:convert';
+
+import 'package:cw_bitcoin/electrum_worker/electrum_worker_methods.dart';
+
+abstract class ElectrumWorkerRequest {
+  abstract final String method;
+
+  Map<String, dynamic> toJson();
+  ElectrumWorkerRequest.fromJson(Map<String, dynamic> json);
+}
+
+class ElectrumWorkerResponse<RESULT, RESPONSE> {
+  ElectrumWorkerResponse({required this.method, required this.result, this.error});
+
+  final String method;
+  final RESULT result;
+  final String? error;
+
+  RESPONSE resultJson(RESULT result) {
+    throw UnimplementedError();
+  }
+
+  factory ElectrumWorkerResponse.fromJson(Map<String, dynamic> json) {
+    throw UnimplementedError();
+  }
+
+  Map<String, dynamic> toJson() {
+    return {'method': method, 'result': resultJson(result), 'error': error};
+  }
+}
+
+class ElectrumWorkerErrorResponse {
+  ElectrumWorkerErrorResponse({required this.error});
+
+  String get method => ElectrumWorkerMethods.unknown.method;
+  final String error;
+
+  factory ElectrumWorkerErrorResponse.fromJson(Map<String, dynamic> json) {
+    return ElectrumWorkerErrorResponse(error: json['error'] as String);
+  }
+
+  Map<String, dynamic> toJson() {
+    return {'method': method, 'error': error};
+  }
+}

cw_bitcoin/lib/electrum_worker/methods/connection.dart

@@ -0,0 +1,50 @@
+part of 'methods.dart';
+
+class ElectrumWorkerConnectionRequest implements ElectrumWorkerRequest {
+  ElectrumWorkerConnectionRequest({required this.uri});
+
+  final Uri uri;
+
+  @override
+  final String method = ElectrumWorkerMethods.connect.method;
+
+  @override
+  factory ElectrumWorkerConnectionRequest.fromJson(Map<String, dynamic> json) {
+    return ElectrumWorkerConnectionRequest(uri: Uri.parse(json['params'] as String));
+  }
+
+  @override
+  Map<String, dynamic> toJson() {
+    return {'method': method, 'params': uri.toString()};
+  }
+}
+
+class ElectrumWorkerConnectionError extends ElectrumWorkerErrorResponse {
+  ElectrumWorkerConnectionError({required String error}) : super(error: error);
+
+  @override
+  String get method => ElectrumWorkerMethods.connect.method;
+}
+
+class ElectrumWorkerConnectionResponse extends ElectrumWorkerResponse<ConnectionStatus, String> {
+  ElectrumWorkerConnectionResponse({required ConnectionStatus status, super.error})
+      : super(
+          result: status,
+          method: ElectrumWorkerMethods.connect.method,
+        );
+
+  @override
+  String resultJson(result) {
+    return result.toString();
+  }
+
+  @override
+  factory ElectrumWorkerConnectionResponse.fromJson(Map<String, dynamic> json) {
+    return ElectrumWorkerConnectionResponse(
+      status: ConnectionStatus.values.firstWhere(
+        (e) => e.toString() == json['result'] as String,
+      ),
+      error: json['error'] as String?,
+    );
+  }
+}

cw_bitcoin/lib/electrum_worker/methods/headers_subscribe.dart

@@ -0,0 +1,44 @@
+part of 'methods.dart';
+
+class ElectrumWorkerHeadersSubscribeRequest implements ElectrumWorkerRequest {
+  ElectrumWorkerHeadersSubscribeRequest();
+
+  @override
+  final String method = ElectrumRequestMethods.headersSubscribe.method;
+
+  @override
+  factory ElectrumWorkerHeadersSubscribeRequest.fromJson(Map<String, dynamic> json) {
+    return ElectrumWorkerHeadersSubscribeRequest();
+  }
+
+  @override
+  Map<String, dynamic> toJson() {
+    return {'method': method};
+  }
+}
+
+class ElectrumWorkerHeadersSubscribeError extends ElectrumWorkerErrorResponse {
+  ElectrumWorkerHeadersSubscribeError({required String error}) : super(error: error);
+
+  @override
+  final String method = ElectrumRequestMethods.headersSubscribe.method;
+}
+
+class ElectrumWorkerHeadersSubscribeResponse
+    extends ElectrumWorkerResponse<ElectrumHeaderResponse, Map<String, dynamic>> {
+  ElectrumWorkerHeadersSubscribeResponse({required super.result, super.error})
+      : super(method: ElectrumRequestMethods.headersSubscribe.method);
+
+  @override
+  Map<String, dynamic> resultJson(result) {
+    return result.toJson();
+  }
+
+  @override
+  factory ElectrumWorkerHeadersSubscribeResponse.fromJson(Map<String, dynamic> json) {
+    return ElectrumWorkerHeadersSubscribeResponse(
+      result: ElectrumHeaderResponse.fromJson(json['result'] as Map<String, dynamic>),
+      error: json['error'] as String?,
+    );
+  }
+}

cw_bitcoin/lib/electrum_worker/methods/methods.dart

@@ -0,0 +1,6 @@
+import 'package:bitcoin_base/bitcoin_base.dart';
+import 'package:cw_bitcoin/electrum_worker/electrum_worker_methods.dart';
+import 'package:cw_bitcoin/electrum_worker/electrum_worker_params.dart';
+part 'connection.dart';
+part 'headers_subscribe.dart';
+part 'scripthashes_subscribe.dart';

cw_bitcoin/lib/electrum_worker/methods/scripthashes_subscribe.dart

@@ -0,0 +1,48 @@
+part of 'methods.dart';
+
+class ElectrumWorkerScripthashesSubscribeRequest implements ElectrumWorkerRequest {
+  ElectrumWorkerScripthashesSubscribeRequest({required this.scripthashByAddress});
+
+  final Map<String, String> scripthashByAddress;
+
+  @override
+  final String method = ElectrumRequestMethods.scriptHashSubscribe.method;
+
+  @override
+  factory ElectrumWorkerScripthashesSubscribeRequest.fromJson(Map<String, dynamic> json) {
+    return ElectrumWorkerScripthashesSubscribeRequest(
+      scripthashByAddress: json['scripthashes'] as Map<String, String>,
+    );
+  }
+
+  @override
+  Map<String, dynamic> toJson() {
+    return {'method': method, 'scripthashes': scripthashByAddress};
+  }
+}
+
+class ElectrumWorkerScripthashesSubscribeError extends ElectrumWorkerErrorResponse {
+  ElectrumWorkerScripthashesSubscribeError({required String error}) : super(error: error);
+
+  @override
+  final String method = ElectrumRequestMethods.scriptHashSubscribe.method;
+}
+
+class ElectrumWorkerScripthashesSubscribeResponse
+    extends ElectrumWorkerResponse<Map<String, String>?, Map<String, String>?> {
+  ElectrumWorkerScripthashesSubscribeResponse({required super.result, super.error})
+      : super(method: ElectrumRequestMethods.scriptHashSubscribe.method);
+
+  @override
+  Map<String, String>? resultJson(result) {
+    return result;
+  }
+
+  @override
+  factory ElectrumWorkerScripthashesSubscribeResponse.fromJson(Map<String, dynamic> json) {
+    return ElectrumWorkerScripthashesSubscribeResponse(
+      result: json['result'] as Map<String, String>?,
+      error: json['error'] as String?,
+    );
+  }
+}