Merge branch 'main' into CAKE-306-add-moonpay-option-for-btc-buying

# Conflicts:
#	lib/buy/wyre/wyre_buy_provider.dart
#	lib/di.dart
#	lib/src/screens/dashboard/dashboard_page.dart
#	lib/view_model/dashboard/dashboard_view_model.dart
#	res/values/strings_de.arb
#	res/values/strings_en.arb
#	res/values/strings_es.arb
#	res/values/strings_hi.arb
#	res/values/strings_ja.arb
#	res/values/strings_ko.arb
#	res/values/strings_nl.arb
#	res/values/strings_pl.arb
#	res/values/strings_pt.arb
#	res/values/strings_ru.arb
#	res/values/strings_uk.arb
#	res/values/strings_zh.arb

.gitignore

@@ -96,3 +96,5 @@ vendor/
 android/app/.cxx/**
 ios/Flutter/.last_build_id
 /lib/generated/**
+#**#
+/**/#**#

analysis_options.yaml

@@ -25,7 +25,6 @@ linter:
     - empty_constructor_bodies
     - empty_statements
     - hash_and_equals
-    - implementation_imports
     - invariant_booleans
     - iterable_contains_unrelated_type
     - library_names

android/app/src/main/java/com/cakewallet/cake_wallet/MainActivity.java

@@ -1,15 +1,49 @@
 package com.cakewallet.cake_wallet;
 
 import androidx.annotation.NonNull;
+
 import io.flutter.embedding.android.FlutterFragmentActivity;
 import io.flutter.embedding.engine.FlutterEngine;
 import io.flutter.plugins.GeneratedPluginRegistrant;
 
+import io.flutter.plugin.common.MethodCall;
+import io.flutter.plugin.common.MethodChannel;
+
+import android.os.AsyncTask;
+import android.os.Handler;
+import android.os.Looper;
+
+import java.security.SecureRandom;
 
 public class MainActivity extends FlutterFragmentActivity {
+    final String UTILS_CHANNEL = "com.cake_wallet/native_utils";
     
     @Override
     public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
         GeneratedPluginRegistrant.registerWith(flutterEngine);
+
+        MethodChannel utilsChannel =
+                new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(),
+                        UTILS_CHANNEL);
+
+        utilsChannel.setMethodCallHandler(this::handle);
+    }
+
+    private void handle(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
+        Handler handler = new Handler(Looper.getMainLooper());
+
+        try {
+            if (call.method.equals("sec_random")) {
+                int count = call.argument("count");
+                SecureRandom random = new SecureRandom();
+                byte bytes[] = new byte[count];
+                random.nextBytes(bytes);
+                handler.post(() -> result.success(bytes));
+            } else {
+                handler.post(() -> result.notImplemented());
+            }
+        } catch (Exception e) {
+            handler.post(() -> result.error("UNCAUGHT_ERROR", e.getMessage(), null));
+        }
     }
 }

android/app/src/main/kotlin/com/cakewallet/cake_wallet/MainActivity.kt

@@ -1,13 +0,0 @@
-package com.cakewallet.cake_wallet
-
-import androidx.annotation.NonNull;
-import io.flutter.embedding.android.FlutterActivity
-import io.flutter.embedding.android.FlutterFragmentActivity
-import io.flutter.embedding.engine.FlutterEngine
-import io.flutter.plugins.GeneratedPluginRegistrant
-
-class MainActivity: FlutterActivity() {
-    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine){
-        GeneratedPluginRegistrant.registerWith(flutterEngine);
-    }
-}

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@android:color/white" />
+    <foreground android:drawable="@drawable/ic_launcher" />
+</adaptive-icon>

assets/litecoin_electrum_server_list.yml

@@ -0,0 +1,2 @@
+-
+  uri: ltc-electrum.cakewallet.com:50002

cw_monero/ios/Classes/monero_api.cpp

@@ -179,8 +179,6 @@ extern "C"
     Monero::SubaddressAccount *m_account;
     uint64_t m_last_known_wallet_height;
     uint64_t m_cached_syncing_blockchain_height = 0;
-    std::mutex store_mutex;
-
 
     void change_current_wallet(Monero::Wallet *wallet)
     {
@@ -451,9 +449,7 @@ extern "C"
 
     void store(char *path)
     {
-        store_mutex.lock();
         get_current_wallet()->store(std::string(path));
-        store_mutex.unlock();
     }
 
     bool transaction_create(char *address, char *payment_id, char *amount,

cw_monero/ios/cw_monero.podspec

@@ -5,20 +5,18 @@
 Pod::Spec.new do |s|
   s.name             = 'cw_monero'
   s.version          = '0.0.2'
-  s.summary          = 'A new flutter plugin project.'
+  s.summary          = 'CW Monero'
-  s.description      = <<-DESC
+  s.description      = 'Cake Wallet wrapper over Monero project.'
-A new flutter plugin project.
+  s.homepage         = 'http://cakewallet.com'
-                       DESC
-  s.homepage         = 'http://example.com'
   s.license          = { :file => '../LICENSE' }
-  s.author           = { 'Your Company' => 'email@example.com' }
+  s.author           = { 'CakeWallet' => 'support@cakewallet.com' }
   s.source           = { :path => '.' }
   s.source_files = 'Classes/**/*'
   s.public_header_files = 'Classes/**/*.h, Classes/*.h, External/ios/libs/monero/include/src/**/*.h, External/ios/libs/monero/include/contrib/**/*.h, External/ios/libs/monero/include/External/ios/**/*.h'
   s.dependency 'Flutter'
   s.platform = :ios, '9.0'
   s.swift_version = '4.0'
-  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'VALID_ARCHS' => 'arm64' }
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'VALID_ARCHS' => 'arm64', 'ENABLE_BITCODE' => 'NO' }
   s.xcconfig = { 'HEADER_SEARCH_PATHS' => "${PODS_ROOT}/#{s.name}/Classes/*.h" }
 
   s.subspec 'OpenSSL' do |openssl|
@@ -53,4 +51,4 @@ A new flutter plugin project.
     lmdb.vendored_libraries = 'External/ios/libs/lmdb/liblmdb.a'
     lmdb.libraries = 'lmdb'
   end
-end
+end

cw_monero/lib/account_list.dart

@@ -5,6 +5,7 @@ import 'package:cw_monero/types.dart';
 import 'package:cw_monero/monero_api.dart';
 import 'package:cw_monero/structs/account_row.dart';
 import 'package:flutter/foundation.dart';
+import 'package:cw_monero/wallet.dart';
 
 final accountSizeNative = moneroApi
     .lookup<NativeFunction<account_size>>('account_size')
@@ -70,8 +71,13 @@ void _setLabelForAccount(Map<String, dynamic> args) {
   setLabelForAccountSync(label: label, accountIndex: accountIndex);
 }
 
-Future<void> addAccount({String label}) async => compute(_addAccount, label);
+Future<void> addAccount({String label}) async {
+  await compute(_addAccount, label);
+  await store();
+}
 
-Future<void> setLabelForAccount({int accountIndex, String label}) async =>
+Future<void> setLabelForAccount({int accountIndex, String label}) async {
-    compute(
+    await compute(
-        _setLabelForAccount, {'accountIndex': accountIndex, 'label': label});
+        _setLabelForAccount, {'accountIndex': accountIndex, 'label': label});
+    await store();
+}

cw_monero/lib/subaddress_list.dart

@@ -5,6 +5,7 @@ import 'package:cw_monero/signatures.dart';
 import 'package:cw_monero/types.dart';
 import 'package:cw_monero/monero_api.dart';
 import 'package:cw_monero/structs/subaddress_row.dart';
+import 'package:cw_monero/wallet.dart';
 
 final subaddressSizeNative = moneroApi
     .lookup<NativeFunction<subaddrress_size>>('subaddrress_size')
@@ -79,14 +80,18 @@ void _setLabelForSubaddress(Map<String, dynamic> args) {
       accountIndex: accountIndex, addressIndex: addressIndex, label: label);
 }
 
-Future addSubaddress({int accountIndex, String label}) async =>
+Future addSubaddress({int accountIndex, String label}) async {
-    compute<Map<String, Object>, void>(
+    await compute<Map<String, Object>, void>(
         _addSubaddress, {'accountIndex': accountIndex, 'label': label});
+    await store();
+}
 
 Future setLabelForSubaddress(
-        {int accountIndex, int addressIndex, String label}) =>
+        {int accountIndex, int addressIndex, String label}) async {
-    compute<Map<String, Object>, void>(_setLabelForSubaddress, {
+  await compute<Map<String, Object>, void>(_setLabelForSubaddress, {
-      'accountIndex': accountIndex,
+    'accountIndex': accountIndex,
-      'addressIndex': addressIndex,
+    'addressIndex': addressIndex,
-      'label': label
+    'label': label
-    });
+  });
+  await store();
+}

cw_monero/lib/wallet_manager.dart

@@ -1,12 +1,12 @@
 import 'dart:ffi';
-import 'package:cw_monero/exceptions/wallet_opening_exception.dart';
-import 'package:cw_monero/wallet.dart';
 import 'package:ffi/ffi.dart';
 import 'package:flutter/foundation.dart';
 import 'package:cw_monero/convert_utf8_to_string.dart';
 import 'package:cw_monero/signatures.dart';
 import 'package:cw_monero/types.dart';
 import 'package:cw_monero/monero_api.dart';
+import 'package:cw_monero/wallet.dart';
+import 'package:cw_monero/exceptions/wallet_opening_exception.dart';
 import 'package:cw_monero/exceptions/wallet_creation_exception.dart';
 import 'package:cw_monero/exceptions/wallet_restore_from_keys_exception.dart';
 import 'package:cw_monero/exceptions/wallet_restore_from_seed_exception.dart';

cw_monero/pubspec.lock

@@ -7,49 +7,49 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.4.2"
+    version: "2.5.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
   characters:
     dependency: transitive
     description:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.0"
+    version: "1.1.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.3"
+    version: "1.2.0"
   clock:
     dependency: transitive
     description:
       name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.1"
+    version: "1.1.0"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.14.13"
+    version: "1.15.0"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0"
   ffi:
     dependency: "direct main"
     description:
@@ -73,21 +73,21 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.8"
+    version: "0.12.10"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.8"
+    version: "1.3.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.0"
+    version: "1.8.0"
   path_provider:
     dependency: "direct main"
     description:
@@ -113,56 +113,56 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.0"
+    version: "1.8.0"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.5"
+    version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.1.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.17"
+    version: "0.2.19"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.0"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.8"
+    version: "2.1.0"
 sdks:
-  dart: ">=2.9.0-14.0.dev <3.0.0"
+  dart: ">=2.12.0-0.0 <3.0.0"
-  flutter: ">=0.1.4 <2.0.0"
+  flutter: ">=0.1.4"

howto-build-android.md

@@ -8,7 +8,7 @@ The following are the system requirements to build CakeWallet for your Android d
 Ubuntu >= 16.04 
 Android SDK 28
 Android NDK 17c
-Flutter 1.22.6
+Flutter 2 or above
 ```
 
 ## Building CakeWallet on Android
@@ -51,9 +51,9 @@ You may download and install the latest version of Android Studio [here](https:/
 
 ### 3. Installing Flutter
 
-CakeWallet requires **EXACTLY** Flutter version `1.22.6` to build properly.
+The easiest way to install Flutter is by using the `snap` package manager. Other means of installing Flutter on your system can be found [here](https://flutter.dev/docs/get-started/install/linux).
 
-To install this version of Flutter on your Ubuntu system, please use [these instructions](https://flutter.dev/docs/get-started/install/linux#install-flutter-manually).
+`$ sudo snap install flutter --classic`
 
 ### 4. Verify Installations
 
@@ -64,7 +64,7 @@ Verify that the Android toolchain, Flutter, and Android Studio have been correct
 The output of this command will appear like this, indicating successful installations. If there are problems with your installation, they **must** be corrected before proceeding.
 ```
 Doctor summary (to see all details, run flutter doctor -v):
-[✓] Flutter (Channel stable, 1.22.6, on Linux, locale en_US.UTF-8)
+[✓] Flutter (Channel stable, 2.0.2, on Linux, locale en_US.UTF-8)
 [✓] Android toolchain - develop for Android devices (Android SDK version 28)
 [✓] Android Studio (version 4.0)
 ```
@@ -87,7 +87,7 @@ $ cd /opt/android
 
 ..and download the source code into that directory.
 
-`$ git clone https://github.com/cake-tech/cake_wallet.git --branch deploy`
+`$ git clone https://github.com/cake-tech/cake_wallet.git --branch main`
 
 Proceed into the source code before proceeding with the next steps:
 

ios/CakeWallet/secRandom.swift

@@ -0,0 +1,12 @@
+import Foundation
+
+func secRandom(count: Int) -> Data? {
+    var bytes = [Int8](repeating: 0, count: count)
+    let status = SecRandomCopyBytes(kSecRandomDefault, bytes.count, &bytes)
+
+    if status == errSecSuccess {
+        return Data(bytes: bytes, count: bytes.count)
+    }
+    
+    return nil
+}

ios/Podfile.lock

@@ -72,7 +72,7 @@ PODS:
     - Flutter
   - path_provider (0.0.1):
     - Flutter
-  - "permission_handler (5.0.1+1)":
+  - "permission_handler (5.1.0+2)":
     - Flutter
   - Reachability (3.2)
   - SDWebImage (5.9.1):
@@ -157,19 +157,19 @@ SPEC CHECKSUMS:
   barcode_scan: a5c27959edfafaa0c771905bad0b29d6d39e4479
   connectivity: c4130b2985d4ef6fd26f9702e886bd5260681467
   CryptoSwift: 093499be1a94b0cae36e6c26b70870668cb56060
-  cw_monero: 2e1f79929880cc2293b5bc1b25e28152e4d84649
+  cw_monero: 78f369253cc913efc23db9cf6be81a11eaf40fe1
-  devicelocale: feebbe5e7a30adb8c4f83185de1b50ff19b44f00
+  devicelocale: b22617f40038496deffba44747101255cee005b0
   DKImagePickerController: b5eb7f7a388e4643264105d648d01f727110fc3d
   DKPhotoGallery: fdfad5125a9fdda9cc57df834d49df790dbb4179
   esys_flutter_share: 403498dab005b36ce1f8d7aff377e81f0621b0b4
   file_picker: 3e6c3790de664ccf9b882732d9db5eaf6b8d4eb1
-  Flutter: 0e3d915762c693b495b44d77113d4970485de6ec
+  Flutter: 434fef37c0980e73bb6479ef766c45957d4b510c
   flutter_secure_storage: 7953c38a04c3fdbb00571bcd87d8e3b5ceb9daec
   local_auth: 25938960984c3a7f6e3253e3f8d962fdd16852bd
   MTBBarcodeScanner: f453b33c4b7dfe545d8c6484ed744d55671788cb
   package_info: 873975fc26034f0b863a300ad47e7f1ac6c7ec62
   path_provider: abfe2b5c733d04e238b0d8691db0cfd63a27a93c
-  permission_handler: eac8e15b4a1a3fba55b761d19f3f4e6b005d15b6
+  permission_handler: ccb20a9fad0ee9b1314a52b70b76b473c5f8dab0
   Reachability: 33e18b67625424e47b6cde6d202dce689ad7af96
   SDWebImage: a990c053fff71e388a10f3357edb0be17929c9c5
   share: 0b2c3e82132f5888bccca3351c504d0003b3b410
@@ -177,7 +177,7 @@ SPEC CHECKSUMS:
   SwiftProtobuf: 4ef85479c18ca85b5482b343df9c319c62bda699
   SwiftyGif: e466e86c660d343357ab944a819a101c4127cb40
   url_launcher: 6fef411d543ceb26efce54b05a0a40bfd74cbbef
-  webview_flutter: d2b4d6c66968ad042ad94cbb791f5b72b4678a96
+  webview_flutter: 9f491a9b5a66f2573946a389b2677987b0ff8c0b
 
 PODFILE CHECKSUM: 5b5f101b119a1b6eb857c967d462832a9062dec4
 

ios/Runner.xcodeproj/project.pbxproj

@@ -8,6 +8,7 @@
 
 /* Begin PBXBuildFile section */
 		0C44A71A2518EF8000B570ED /* decrypt.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0C44A7192518EF8000B570ED /* decrypt.swift */; };
+		0C9D68C9264854B60011B691 /* secRandom.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0C9D68C8264854B60011B691 /* secRandom.swift */; };
 		1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */; };
 		20ED0868E1BD7E12278C0CB3 /* Pods_Runner.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = B26E3F56D69167FBB1DC160A /* Pods_Runner.framework */; };
 		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
@@ -21,6 +22,7 @@
 		0C400E0F25B21ABB0025E469 /* Runner.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = Runner.entitlements; sourceTree = "<group>"; };
 		0C44A7192518EF8000B570ED /* decrypt.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = decrypt.swift; sourceTree = "<group>"; };
 		0C9986A3251A932F00D566FD /* CryptoSwift.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = CryptoSwift.framework; sourceTree = BUILT_PRODUCTS_DIR; };
+		0C9D68C8264854B60011B691 /* secRandom.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = secRandom.swift; sourceTree = "<group>"; };
 		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
 		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
 		20F67A1B2C2FCB2A3BB048C1 /* Pods-Runner.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.debug.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"; sourceTree = "<group>"; };
@@ -65,6 +67,7 @@
 			isa = PBXGroup;
 			children = (
 				0C44A7192518EF8000B570ED /* decrypt.swift */,
+				0C9D68C8264854B60011B691 /* secRandom.swift */,
 			);
 			path = CakeWallet;
 			sourceTree = "<group>";
@@ -274,6 +277,7 @@
 			files = (
 				74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */,
 				1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */,
+				0C9D68C9264854B60011B691 /* secRandom.swift in Sources */,
 				0C44A71A2518EF8000B570ED /* decrypt.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -331,6 +335,7 @@
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				COPY_PHASE_STRIP = NO;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_BITCODE = NO;
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
@@ -357,7 +362,7 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_ENTITLEMENTS = Runner/Runner.entitlements;
-				CURRENT_PROJECT_VERSION = 31;
+				CURRENT_PROJECT_VERSION = 40;
 				DEVELOPMENT_TEAM = 32J6BB6VUS;
 				ENABLE_BITCODE = NO;
 				FRAMEWORK_SEARCH_PATHS = (
@@ -374,7 +379,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				MARKETING_VERSION = 4.1.3;
+				MARKETING_VERSION = 4.2.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.fotolockr.cakewallet;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
@@ -415,6 +420,7 @@
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				COPY_PHASE_STRIP = NO;
 				DEBUG_INFORMATION_FORMAT = dwarf;
+				ENABLE_BITCODE = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
@@ -470,6 +476,7 @@
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				COPY_PHASE_STRIP = NO;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_BITCODE = NO;
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
@@ -498,7 +505,7 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_ENTITLEMENTS = Runner/Runner.entitlements;
-				CURRENT_PROJECT_VERSION = 31;
+				CURRENT_PROJECT_VERSION = 40;
 				DEVELOPMENT_TEAM = 32J6BB6VUS;
 				ENABLE_BITCODE = NO;
 				FRAMEWORK_SEARCH_PATHS = (
@@ -515,7 +522,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				MARKETING_VERSION = 4.1.3;
+				MARKETING_VERSION = 4.2.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.fotolockr.cakewallet;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
@@ -533,7 +540,7 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_ENTITLEMENTS = Runner/Runner.entitlements;
-				CURRENT_PROJECT_VERSION = 31;
+				CURRENT_PROJECT_VERSION = 40;
 				DEVELOPMENT_TEAM = 32J6BB6VUS;
 				ENABLE_BITCODE = NO;
 				FRAMEWORK_SEARCH_PATHS = (
@@ -550,7 +557,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				MARKETING_VERSION = 4.1.3;
+				MARKETING_VERSION = 4.2.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.fotolockr.cakewallet;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";

ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -2,6 +2,6 @@
 <Workspace
    version = "1.0">
    <FileRef
-      location = "group:Runner.xcodeproj">
+      location = "self:">
    </FileRef>
 </Workspace>

ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -27,8 +27,6 @@
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       shouldUseLaunchSchemeArgsEnv = "YES">
-      <Testables>
-      </Testables>
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
@@ -38,8 +36,8 @@
             ReferencedContainer = "container:Runner.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
-      <AdditionalOptions>
+      <Testables>
-      </AdditionalOptions>
+      </Testables>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
@@ -61,8 +59,6 @@
             ReferencedContainer = "container:Runner.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Profile"

ios/Runner/AppDelegate.swift

@@ -8,9 +8,10 @@ import Flutter
         didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
     ) -> Bool {
         let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
-        let batteryChannel = FlutterMethodChannel(name: "com.cakewallet.cakewallet/legacy_wallet_migration",
+        let legacyMigrationChannel = FlutterMethodChannel(
-                                                  binaryMessenger: controller.binaryMessenger)
+            name: "com.cakewallet.cakewallet/legacy_wallet_migration",
-        batteryChannel.setMethodCallHandler({
+            binaryMessenger: controller.binaryMessenger)
+        legacyMigrationChannel.setMethodCallHandler({
             (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
             
             switch call.method {
@@ -52,6 +53,24 @@ import Flutter
             }
         })
         
+        let utilsChannel = FlutterMethodChannel(
+            name: "com.cake_wallet/native_utils",
+            binaryMessenger: controller.binaryMessenger)
+        utilsChannel.setMethodCallHandler({ (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
+            switch call.method {
+            case "sec_random":
+                guard let args = call.arguments as? Dictionary<String, Any>,
+                      let count = args["count"] as? Int else {
+                    result(nil)
+                    return
+                }
+
+                result(secRandom(count: count))
+            default:
+                result(FlutterMethodNotImplemented)
+            }
+        })
+        
         GeneratedPluginRegistrant.register(with: self)
         return super.application(application, didFinishLaunchingWithOptions: launchOptions)
     }

ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -2,100 +2,100 @@
   "images" : [
     {
       "idiom" : "iphone",
-      "size" : "20x20",
+      "scale" : "2x",
-      "scale" : "2x"
+      "size" : "20x20"
     },
     {
       "idiom" : "iphone",
-      "size" : "20x20",
+      "scale" : "3x",
-      "scale" : "3x"
+      "size" : "20x20"
     },
     {
       "idiom" : "iphone",
-      "size" : "29x29",
+      "scale" : "2x",
-      "scale" : "2x"
+      "size" : "29x29"
     },
     {
       "idiom" : "iphone",
-      "size" : "29x29",
+      "scale" : "3x",
-      "scale" : "3x"
+      "size" : "29x29"
     },
     {
       "idiom" : "iphone",
-      "size" : "40x40",
+      "scale" : "2x",
-      "scale" : "2x"
+      "size" : "40x40"
     },
     {
       "idiom" : "iphone",
-      "size" : "40x40",
+      "scale" : "3x",
-      "scale" : "3x"
+      "size" : "40x40"
     },
     {
-      "size" : "60x60",
+      "filename" : "app_icon_120.png",
       "idiom" : "iphone",
-      "filename" : "cake_xmr_120.png",
+      "scale" : "2x",
-      "scale" : "2x"
+      "size" : "60x60"
     },
     {
-      "size" : "60x60",
+      "filename" : "app_icon_180.png",
       "idiom" : "iphone",
-      "filename" : "cake_xmr_180.png",
+      "scale" : "3x",
-      "scale" : "3x"
+      "size" : "60x60"
     },
     {
       "idiom" : "ipad",
-      "size" : "20x20",
+      "scale" : "1x",
-      "scale" : "1x"
+      "size" : "20x20"
     },
     {
       "idiom" : "ipad",
-      "size" : "20x20",
+      "scale" : "2x",
-      "scale" : "2x"
+      "size" : "20x20"
     },
     {
       "idiom" : "ipad",
-      "size" : "29x29",
+      "scale" : "1x",
-      "scale" : "1x"
+      "size" : "29x29"
     },
     {
       "idiom" : "ipad",
-      "size" : "29x29",
+      "scale" : "2x",
-      "scale" : "2x"
+      "size" : "29x29"
     },
     {
       "idiom" : "ipad",
-      "size" : "40x40",
+      "scale" : "1x",
-      "scale" : "1x"
+      "size" : "40x40"
     },
     {
       "idiom" : "ipad",
-      "size" : "40x40",
+      "scale" : "2x",
-      "scale" : "2x"
+      "size" : "40x40"
     },
     {
       "idiom" : "ipad",
-      "size" : "76x76",
+      "scale" : "1x",
-      "scale" : "1x"
+      "size" : "76x76"
     },
     {
       "idiom" : "ipad",
-      "size" : "76x76",
+      "scale" : "2x",
-      "scale" : "2x"
+      "size" : "76x76"
     },
     {
       "idiom" : "ipad",
-      "size" : "83.5x83.5",
+      "scale" : "2x",
-      "scale" : "2x"
+      "size" : "83.5x83.5"
     },
     {
-      "size" : "1024x1024",
+      "filename" : "app_icon_1024.png",
       "idiom" : "ios-marketing",
-      "filename" : "cake_xmr_1024.png",
+      "scale" : "1x",
-      "scale" : "1x"
+      "size" : "1024x1024"
     }
   ],
   "info" : {
-    "version" : 1,
+    "author" : "xcode",
-    "author" : "xcode"
+    "version" : 1
   }
-}
+}

ios/Runner/Info.plist

@@ -24,6 +24,11 @@
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
+	<key>NSAppTransportSecurity</key>
+	<dict>
+		<key>NSAllowsArbitraryLoads</key>
+		<true/>
+	</dict>
 	<key>NSCameraUsageDescription</key>
 	<string>Used for scan QR code</string>
 	<key>NSDocumentsFolderUsageDescription</key>

lib/bitcoin/address_to_output_script.dart

@@ -1,25 +1,29 @@
 import 'dart:typed_data';
+import 'package:bitcoin_flutter/bitcoin_flutter.dart' as bitcoin;
 import 'package:bs58check/bs58check.dart' as bs58check;
 import 'package:bitcoin_flutter/src/utils/constants/op.dart';
 import 'package:bitcoin_flutter/src/utils/script.dart' as bscript;
 import 'package:bitcoin_flutter/src/address.dart';
 
-
 Uint8List p2shAddressToOutputScript(String address) {
   final decodeBase58 = bs58check.decode(address);
   final hash = decodeBase58.sublist(1);
   return bscript.compile(<dynamic>[OPS['OP_HASH160'], hash, OPS['OP_EQUAL']]);
 }
 
-Uint8List addressToOutputScript(String address) {
+Uint8List addressToOutputScript(
+    String address, bitcoin.NetworkType networkType) {
   try {
     // FIXME: improve validation for p2sh addresses
-    if (address.startsWith('3')) {
+    // 3 for bitcoin
+    // m for litecoin
+    if (address.startsWith('3') || address.toLowerCase().startsWith('m')) {
       return p2shAddressToOutputScript(address);
     }
 
-    return Address.addressToOutputScript(address);
+    return Address.addressToOutputScript(address, networkType);
-  } catch (_) {
+  } catch (err) {
+    print(err);
     return Uint8List(0);
   }
-}
+}

lib/bitcoin/bitcoin_address_record.dart

@@ -1,14 +1,14 @@
 import 'dart:convert';
-import 'package:quiver/core.dart';
 
 class BitcoinAddressRecord {
-  BitcoinAddressRecord(this.address, {this.index});
+  BitcoinAddressRecord(this.address, {this.index, bool isHidden})
+      : _isHidden = isHidden;
 
   factory BitcoinAddressRecord.fromJSON(String jsonSource) {
     final decoded = json.decode(jsonSource) as Map;
 
     return BitcoinAddressRecord(decoded['address'] as String,
-        index: decoded['index'] as int);
+        index: decoded['index'] as int, isHidden: decoded['isHidden'] as bool);
   }
 
   @override
@@ -16,10 +16,13 @@ class BitcoinAddressRecord {
       o is BitcoinAddressRecord && address == o.address;
 
   final String address;
+  bool get isHidden => _isHidden ?? false;
   int index;
+  final bool _isHidden;
 
   @override
   int get hashCode => address.hashCode;
 
-  String toJSON() => json.encode({'address': address, 'index': index});
+  String toJSON() =>
+      json.encode({'address': address, 'index': index, 'isHidden': isHidden});
 }

lib/bitcoin/bitcoin_mnemonic.dart

@@ -4,23 +4,11 @@ import 'dart:typed_data';
 import 'package:crypto/crypto.dart';
 import 'package:unorm_dart/unorm_dart.dart' as unorm;
 import 'package:cryptography/cryptography.dart' as cryptography;
+import 'package:cake_wallet/core/sec_random_native.dart';
 
 const segwit = '100';
 final wordlist = englishWordlist;
 
-Uint8List randomBytes(int length, {bool secure = false}) {
-  assert(length > 0);
-
-  final random = secure ? Random.secure() : Random();
-  final ret = Uint8List(length);
-
-  for (var i = 0; i < length; i++) {
-    ret[i] = random.nextInt(256);
-  }
-
-  return ret;
-}
-
 double logBase(num x, num base) => log(x) / log(base);
 
 String mnemonicEncode(int i) {
@@ -102,14 +90,15 @@ List<bool> prefixMatches(String source, List<String> prefixes) {
   return prefixes.map((prefix) => hx.startsWith(prefix.toLowerCase())).toList();
 }
 
-String generateMnemonic({int strength = 132, String prefix = segwit}) {
+Future<String> generateMnemonic(
+    {int strength = 264, String prefix = segwit}) async {
   final wordBitlen = logBase(wordlist.length, 2).ceil();
   final wordCount = strength / wordBitlen;
   final byteCount = ((wordCount * wordBitlen).ceil() / 8).ceil();
   var result = '';
 
   do {
-    final bytes = randomBytes(byteCount);
+    final bytes = await secRandom(byteCount);
     maskBytes(bytes, strength);
     result = encode(bytes);
   } while (!prefixMatches(result, [prefix]).first);
@@ -134,7 +123,7 @@ bool matchesAnyPrefix(String mnemonic) =>
 bool validateMnemonic(String mnemonic, {String prefix = segwit}) {
   try {
     return matchesAnyPrefix(mnemonic);
-  } catch(e) {
+  } catch (e) {
     return false;
   }
 }

lib/bitcoin/bitcoin_mnemonic_is_incorrect_exception.dart

@@ -1,5 +1,5 @@
 class BitcoinMnemonicIsIncorrectException implements Exception {
   @override
   String toString() =>
-      'Bitcoin mnemonic has incorrect format. Mnemonic should contain 12 words separated by space.';
+      'Bitcoin mnemonic has incorrect format. Mnemonic should contain 24 words separated by space.';
 }

lib/bitcoin/bitcoin_transaction_history.dart

@@ -1,192 +0,0 @@
-import 'dart:convert';
-import 'package:flutter/foundation.dart';
-import 'package:mobx/mobx.dart';
-import 'package:cake_wallet/core/transaction_history.dart';
-import 'package:cake_wallet/bitcoin/file.dart';
-import 'package:cake_wallet/bitcoin/bitcoin_wallet.dart';
-import 'package:cake_wallet/bitcoin/bitcoin_transaction_info.dart';
-import 'package:cake_wallet/bitcoin/electrum.dart';
-
-part 'bitcoin_transaction_history.g.dart';
-
-const _transactionsHistoryFileName = 'transactions.json';
-
-class BitcoinTransactionHistory = BitcoinTransactionHistoryBase
-    with _$BitcoinTransactionHistory;
-
-abstract class BitcoinTransactionHistoryBase
-    extends TransactionHistoryBase<BitcoinTransactionInfo> with Store {
-  BitcoinTransactionHistoryBase(
-      {this.eclient, String dirPath, @required String password})
-      : path = '$dirPath/$_transactionsHistoryFileName',
-        _password = password,
-        _height = 0,
-        _isUpdating = false {
-    transactions = ObservableMap<String, BitcoinTransactionInfo>();
-  }
-
-  BitcoinWalletBase wallet;
-  final ElectrumClient eclient;
-  final String path;
-  final String _password;
-  int _height;
-  bool _isUpdating;
-
-  Future<void> init() async {
-    await _load();
-  }
-
-  @override
-  Future update() async {
-    if (_isUpdating) {
-      return;
-    }
-
-    try {
-      _isUpdating = true;
-      final txs = await fetchTransactions();
-      await add(txs);
-      _isUpdating = false;
-    } catch (_) {
-      _isUpdating = false;
-      rethrow;
-    }
-  }
-
-  @override
-  Future<Map<String, BitcoinTransactionInfo>> fetchTransactions() async {
-    final histories =
-        wallet.scriptHashes.map((scriptHash) => eclient.getHistory(scriptHash));
-    final _historiesWithDetails = await Future.wait(histories)
-        .then((histories) => histories.expand((i) => i).toList())
-        .then((histories) => histories.map((tx) => fetchTransactionInfo(
-            hash: tx['tx_hash'] as String, height: tx['height'] as int)));
-    final historiesWithDetails = await Future.wait(_historiesWithDetails);
-
-    return historiesWithDetails.fold<Map<String, BitcoinTransactionInfo>>(
-        <String, BitcoinTransactionInfo>{}, (acc, tx) {
-      acc[tx.id] = acc[tx.id]?.updated(tx) ?? tx;
-      return acc;
-    });
-  }
-
-  Future<BitcoinTransactionInfo> fetchTransactionInfo(
-      {@required String hash, @required int height}) async {
-    final tx = await eclient.getTransactionExpanded(hash: hash);
-    return BitcoinTransactionInfo.fromElectrumVerbose(tx,
-        height: height, addresses: wallet.addresses);
-  }
-
-  Future<void> add(Map<String, BitcoinTransactionInfo> transactionsList) async {
-    transactionsList.entries.forEach((entry) {
-      _updateOrInsert(entry.value);
-
-      if (entry.value.height > _height) {
-        _height = entry.value.height;
-      }
-    });
-
-    await save();
-  }
-
-  Future<void> addOne(BitcoinTransactionInfo tx) async {
-    _updateOrInsert(tx);
-
-    if (tx.height > _height) {
-      _height = tx.height;
-    }
-
-    await save();
-  }
-
-  BitcoinTransactionInfo get(String id) => transactions[id];
-
-  Future<void> save() async {
-    try {
-      final data = json.encode({'height': _height, 'transactions': transactions});
-      await writeData(path: path, password: _password, data: data);
-    } catch(e) {
-      print('Error while save bitcoin transaction history: ${e.toString()}');
-    }
-  }
-
-  @override
-  void updateAsync({void Function() onFinished}) {
-    fetchTransactionsAsync((transaction) => _updateOrInsert(transaction),
-        onFinished: onFinished);
-  }
-
-  @override
-  void fetchTransactionsAsync(
-      void Function(BitcoinTransactionInfo transaction) onTransactionLoaded,
-      {void Function() onFinished}) async {
-    final histories = await Future.wait(wallet.scriptHashes
-        .map((scriptHash) async => await eclient.getHistory(scriptHash)));
-    final transactionsCount =
-        histories.fold<int>(0, (acc, m) => acc + m.length);
-    var counter = 0;
-
-    final batches = histories.map((metaList) =>
-        _fetchBatchOfTransactions(metaList, onTransactionLoaded: (transaction) {
-          onTransactionLoaded(transaction);
-          counter += 1;
-
-          if (counter == transactionsCount) {
-            onFinished?.call();
-          }
-        }));
-
-    await Future.wait(batches);
-  }
-
-  Future<void> _fetchBatchOfTransactions(
-          Iterable<Map<String, dynamic>> metaList,
-          {void Function(BitcoinTransactionInfo tranasaction)
-              onTransactionLoaded}) async =>
-      metaList.forEach((txMeta) => fetchTransactionInfo(
-              hash: txMeta['tx_hash'] as String,
-              height: txMeta['height'] as int)
-          .then((transaction) => onTransactionLoaded(transaction)));
-
-  Future<Map<String, Object>> _read() async {
-    final content = await read(path: path, password: _password);
-    return json.decode(content) as Map<String, Object>;
-  }
-
-  Future<void> _load() async {
-    try {
-      final content = await _read();
-      final txs = content['transactions'] as Map<String, Object> ?? {};
-
-      txs.entries.forEach((entry) {
-        final val = entry.value;
-
-        if (val is Map<String, Object>) {
-          final tx = BitcoinTransactionInfo.fromJson(val);
-          _updateOrInsert(tx);
-        }
-      });
-
-      _height = content['height'] as int;
-    } catch (e) {
-      print(e);
-    }
-  }
-
-  void _updateOrInsert(BitcoinTransactionInfo transaction) {
-    if (transaction.id == null) {
-      return;
-    }
-
-    if (transactions[transaction.id] == null) {
-      transactions[transaction.id] = transaction;
-    } else {
-      final originalTx = transactions[transaction.id];
-      originalTx.confirmations = transaction.confirmations;
-      originalTx.amount = transaction.amount;
-      originalTx.height = transaction.height;
-      originalTx.date ??= transaction.date;
-      originalTx.isPending = transaction.isPending;
-    }
-  }
-}

lib/bitcoin/bitcoin_transaction_priority.dart

@@ -26,13 +26,15 @@ class BitcoinTransactionPriority extends TransactionPriority {
     }
   }
 
+  String get units => 'sat';
+
   @override
   String toString() {
     var label = '';
 
     switch (this) {
       case BitcoinTransactionPriority.slow:
-        label = S.current.transaction_priority_slow;
+        label = '${S.current.transaction_priority_slow} ~24hrs';
         break;
       case BitcoinTransactionPriority.medium:
         label = S.current.transaction_priority_medium;
@@ -46,4 +48,56 @@ class BitcoinTransactionPriority extends TransactionPriority {
 
     return label;
   }
+
+  String labelWithRate(int rate) => '${toString()} ($rate ${units}/byte)';
+}
+
+class LitecoinTransactionPriority extends BitcoinTransactionPriority {
+  const LitecoinTransactionPriority({String title, int raw})
+      : super(title: title, raw: raw);
+
+  static const List<LitecoinTransactionPriority> all = [fast, medium, slow];
+  static const LitecoinTransactionPriority slow =
+      LitecoinTransactionPriority(title: 'Slow', raw: 0);
+  static const LitecoinTransactionPriority medium =
+      LitecoinTransactionPriority(title: 'Medium', raw: 1);
+  static const LitecoinTransactionPriority fast =
+      LitecoinTransactionPriority(title: 'Fast', raw: 2);
+
+  static LitecoinTransactionPriority deserialize({int raw}) {
+    switch (raw) {
+      case 0:
+        return slow;
+      case 1:
+        return medium;
+      case 2:
+        return fast;
+      default:
+        return null;
+    }
+  }
+
+  @override
+  String get units => 'Latoshi';
+
+  @override
+  String toString() {
+    var label = '';
+
+    switch (this) {
+      case LitecoinTransactionPriority.slow:
+        label = S.current.transaction_priority_slow;
+        break;
+      case LitecoinTransactionPriority.medium:
+        label = S.current.transaction_priority_medium;
+        break;
+      case LitecoinTransactionPriority.fast:
+        label = S.current.transaction_priority_fast;
+        break;
+      default:
+        break;
+    }
+
+    return label;
+  }
 }

lib/bitcoin/bitcoin_unspent.dart

@@ -13,5 +13,6 @@ class BitcoinUnspent {
   final int value;
   final int vout;
 
-  bool get isP2wpkh => address.address.startsWith('bc1');
+  bool get isP2wpkh =>
+      address.address.startsWith('bc') || address.address.startsWith('ltc');
 }

lib/bitcoin/bitcoin_wallet.dart

@@ -1,472 +1,51 @@
-import 'dart:async';
-import 'dart:convert';
-import 'package:cake_wallet/bitcoin/address_to_output_script.dart';
-import 'package:cake_wallet/bitcoin/bitcoin_mnemonic.dart';
-import 'package:cake_wallet/bitcoin/bitcoin_transaction_priority.dart';
-import 'package:cake_wallet/entities/transaction_priority.dart';
 import 'package:mobx/mobx.dart';
 import 'package:flutter/foundation.dart';
-import 'package:rxdart/rxdart.dart';
 import 'package:bitcoin_flutter/bitcoin_flutter.dart' as bitcoin;
-import 'package:cake_wallet/bitcoin/bitcoin_transaction_credentials.dart';
-import 'package:cake_wallet/bitcoin/bitcoin_transaction_no_inputs_exception.dart';
-import 'package:cake_wallet/bitcoin/bitcoin_transaction_wrong_balance_exception.dart';
-import 'package:cake_wallet/bitcoin/bitcoin_unspent.dart';
-import 'package:cake_wallet/bitcoin/bitcoin_wallet_keys.dart';
-import 'package:cake_wallet/bitcoin/electrum.dart';
-import 'package:cake_wallet/bitcoin/pending_bitcoin_transaction.dart';
-import 'package:cake_wallet/bitcoin/script_hash.dart';
 import 'package:cake_wallet/bitcoin/utils.dart';
-import 'package:cake_wallet/bitcoin/bitcoin_amount_format.dart';
+import 'package:cake_wallet/bitcoin/electrum_wallet_snapshot.dart';
-import 'package:cake_wallet/entities/sync_status.dart';
+import 'package:cake_wallet/bitcoin/electrum_wallet.dart';
 import 'package:cake_wallet/entities/wallet_info.dart';
-import 'package:cake_wallet/bitcoin/bitcoin_transaction_history.dart';
 import 'package:cake_wallet/bitcoin/bitcoin_address_record.dart';
-import 'package:cake_wallet/bitcoin/file.dart';
+import 'package:cake_wallet/bitcoin/electrum_balance.dart';
-import 'package:cake_wallet/bitcoin/bitcoin_balance.dart';
-import 'package:cake_wallet/entities/node.dart';
-import 'package:cake_wallet/core/wallet_base.dart';
 
 part 'bitcoin_wallet.g.dart';
 
 class BitcoinWallet = BitcoinWalletBase with _$BitcoinWallet;
 
-abstract class BitcoinWalletBase extends WalletBase<BitcoinBalance> with Store {
+abstract class BitcoinWalletBase extends ElectrumWallet with Store {
-  BitcoinWalletBase._internal(
+  BitcoinWalletBase(
-      {@required this.eclient,
-      @required this.path,
-      @required String password,
-      @required WalletInfo walletInfo,
-      @required List<BitcoinAddressRecord> initialAddresses,
-      int accountIndex = 0,
-      this.transactionHistory,
-      this.mnemonic,
-      BitcoinBalance initialBalance})
-      : balance =
-            initialBalance ?? BitcoinBalance(confirmed: 0, unconfirmed: 0),
-        hd = bitcoin.HDWallet.fromSeed(mnemonicToSeedBytes(mnemonic),
-                network: bitcoin.bitcoin)
-            .derivePath("m/0'/0"),
-        addresses = initialAddresses != null
-            ? ObservableList<BitcoinAddressRecord>.of(initialAddresses.toSet())
-            : ObservableList<BitcoinAddressRecord>(),
-        syncStatus = NotConnectedSyncStatus(),
-        _password = password,
-        _accountIndex = accountIndex,
-        _feeRates = <int>[],
-        super(walletInfo) {
-    _unspent = [];
-    _scripthashesUpdateSubject = {};
-  }
-
-  static BitcoinWallet fromJSON(
-      {@required String password,
-      @required String name,
-      @required String dirPath,
-      @required WalletInfo walletInfo,
-      String jsonSource}) {
-    final data = json.decode(jsonSource) as Map;
-    final mnemonic = data['mnemonic'] as String;
-    final accountIndex =
-        (data['account_index'] == 'null' || data['account_index'] == null)
-            ? 0
-            : int.parse(data['account_index'] as String);
-    final _addresses = data['addresses'] as List ?? <Object>[];
-    final addresses = <BitcoinAddressRecord>[];
-    final balance = BitcoinBalance.fromJSON(data['balance'] as String) ??
-        BitcoinBalance(confirmed: 0, unconfirmed: 0);
-
-    _addresses.forEach((Object el) {
-      if (el is String) {
-        addresses.add(BitcoinAddressRecord.fromJSON(el));
-      }
-    });
-
-    return BitcoinWalletBase.build(
-        dirPath: dirPath,
-        mnemonic: mnemonic,
-        password: password,
-        name: name,
-        accountIndex: accountIndex,
-        initialAddresses: addresses,
-        initialBalance: balance,
-        walletInfo: walletInfo);
-  }
-
-  static BitcoinWallet build(
       {@required String mnemonic,
       @required String password,
-      @required String name,
-      @required String dirPath,
       @required WalletInfo walletInfo,
       List<BitcoinAddressRecord> initialAddresses,
-      BitcoinBalance initialBalance,
+      ElectrumBalance initialBalance,
-      int accountIndex = 0}) {
+      int accountIndex = 0})
-    final walletPath = '$dirPath/$name';
+      : super(
-    final eclient = ElectrumClient();
+            mnemonic: mnemonic,
-    final history = BitcoinTransactionHistory(
+            password: password,
-        eclient: eclient, dirPath: dirPath, password: password);
+            walletInfo: walletInfo,
+            networkType: bitcoin.bitcoin,
+            initialAddresses: initialAddresses,
+            initialBalance: initialBalance,
+            accountIndex: accountIndex);
 
-    return BitcoinWallet._internal(
+  static Future<BitcoinWallet> open({
-        eclient: eclient,
+    @required String name,
-        path: walletPath,
+    @required WalletInfo walletInfo,
-        mnemonic: mnemonic,
+    @required String password,
+  }) async {
+    final snp = ElectrumWallletSnapshot(name, walletInfo.type, password);
+    await snp.load();
+    return BitcoinWallet(
+        mnemonic: snp.mnemonic,
         password: password,
-        accountIndex: accountIndex,
+        walletInfo: walletInfo,
-        initialAddresses: initialAddresses,
+        initialAddresses: snp.addresses,
-        initialBalance: initialBalance,
+        initialBalance: snp.balance,
-        transactionHistory: history,
+        accountIndex: snp.accountIndex);
-        walletInfo: walletInfo);
-  }
-
-  static int estimatedTransactionSize(int inputsCount, int outputsCounts) =>
-      inputsCount * 146 + outputsCounts * 33 + 8;
-
-  @override
-  final BitcoinTransactionHistory transactionHistory;
-  final String path;
-  final bitcoin.HDWallet hd;
-  final ElectrumClient eclient;
-  final String mnemonic;
-
-  List<BitcoinUnspent> _unspent;
-
-  @override
-  @observable
-  String address;
-
-  @override
-  @observable
-  BitcoinBalance balance;
-
-  @override
-  @observable
-  SyncStatus syncStatus;
-
-  ObservableList<BitcoinAddressRecord> addresses;
-
-  List<String> get scriptHashes =>
-      addresses.map((addr) => scriptHash(addr.address)).toList();
-
-  String get xpub => hd.base58;
-
-  @override
-  String get seed => mnemonic;
-
-  @override
-  BitcoinWalletKeys get keys => BitcoinWalletKeys(
-      wif: hd.wif, privateKey: hd.privKey, publicKey: hd.pubKey);
-
-  final String _password;
-  List<int> _feeRates;
-  int _accountIndex;
-  Map<String, BehaviorSubject<Object>> _scripthashesUpdateSubject;
-
-  Future<void> init() async {
-    if (addresses.isEmpty || addresses.length < 33) {
-      final addressesCount = 33 - addresses.length;
-      await generateNewAddresses(addressesCount, startIndex: addresses.length);
-    }
-
-    address = addresses[_accountIndex].address;
-    transactionHistory.wallet = this;
-    await transactionHistory.init();
-  }
-
-  @action
-  Future<void> nextAddress() async {
-    _accountIndex += 1;
-
-    if (_accountIndex >= addresses.length) {
-      _accountIndex = 0;
-    }
-
-    address = addresses[_accountIndex].address;
-
-    await save();
-  }
-
-  Future<BitcoinAddressRecord> generateNewAddress() async {
-    _accountIndex += 1;
-    final address = BitcoinAddressRecord(_getAddress(index: _accountIndex),
-        index: _accountIndex);
-    addresses.add(address);
-
-    await save();
-
-    return address;
-  }
-
-  Future<List<BitcoinAddressRecord>> generateNewAddresses(int count,
-      {int startIndex = 0}) async {
-    final list = <BitcoinAddressRecord>[];
-
-    for (var i = startIndex; i < count + startIndex; i++) {
-      final address = BitcoinAddressRecord(_getAddress(index: i), index: i);
-      list.add(address);
-    }
-
-    addresses.addAll(list);
-    await save();
-
-    return list;
-  }
-
-  Future<void> updateAddress(String address) async {
-    for (final addr in addresses) {
-      if (addr.address == address) {
-        await save();
-        break;
-      }
-    }
-  }
-
-  @action
-  @override
-  Future<void> startSync() async {
-    try {
-      syncStatus = StartingSyncStatus();
-      transactionHistory.updateAsync(onFinished: () {
-        print('transactionHistory update finished!');
-        transactionHistory.save();
-      });
-      _subscribeForUpdates();
-      await _updateBalance();
-      await _updateUnspent();
-      _feeRates = await eclient.feeRates();
-
-      Timer.periodic(const Duration(minutes: 1),
-          (timer) async => _feeRates = await eclient.feeRates());
-
-      syncStatus = SyncedSyncStatus();
-    } catch (e) {
-      print(e.toString());
-      syncStatus = FailedSyncStatus();
-    }
-  }
-
-  @action
-  @override
-  Future<void> connectToNode({@required Node node}) async {
-    try {
-      syncStatus = ConnectingSyncStatus();
-      await eclient.connectToUri(node.uri);
-      eclient.onConnectionStatusChange = (bool isConnected) {
-        if (!isConnected) {
-          syncStatus = LostConnectionSyncStatus();
-        }
-      };
-      syncStatus = ConnectedSyncStatus();
-    } catch (e) {
-      print(e.toString());
-      syncStatus = FailedSyncStatus();
-    }
   }
 
   @override
-  Future<PendingBitcoinTransaction> createTransaction(
+  String getAddress({@required int index, @required bitcoin.HDWallet hd}) =>
-      Object credentials) async {
+      generateP2WPKHAddress(hd: hd, index: index, networkType: networkType);
-    const minAmount = 546;
-    final transactionCredentials = credentials as BitcoinTransactionCredentials;
-    final inputs = <BitcoinUnspent>[];
-    final allAmountFee =
-        calculateEstimatedFee(transactionCredentials.priority, null);
-    final allAmount = balance.confirmed - allAmountFee;
-    var fee = 0;
-    final credentialsAmount = transactionCredentials.amount != null
-        ? stringDoubleToBitcoinAmount(transactionCredentials.amount)
-        : 0;
-    final amount = transactionCredentials.amount == null ||
-            allAmount - credentialsAmount < minAmount
-        ? allAmount
-        : credentialsAmount;
-    final txb = bitcoin.TransactionBuilder(network: bitcoin.bitcoin);
-    final changeAddress = address;
-    var leftAmount = amount;
-    var totalInputAmount = 0;
-
-    if (_unspent.isEmpty) {
-      await _updateUnspent();
-    }
-
-    for (final utx in _unspent) {
-      leftAmount = leftAmount - utx.value;
-      totalInputAmount += utx.value;
-      inputs.add(utx);
-
-      if (leftAmount <= 0) {
-        break;
-      }
-    }
-
-    if (inputs.isEmpty) {
-      throw BitcoinTransactionNoInputsException();
-    }
-
-    final totalAmount = amount + fee;
-    fee = transactionCredentials.amount != null
-        ? feeAmountForPriority(transactionCredentials.priority, inputs.length,
-            amount == allAmount ? 1 : 2)
-        : allAmountFee;
-
-    if (totalAmount > balance.confirmed) {
-      throw BitcoinTransactionWrongBalanceException();
-    }
-
-    if (amount <= 0 || totalInputAmount < amount) {
-      throw BitcoinTransactionWrongBalanceException();
-    }
-
-    txb.setVersion(1);
-
-    inputs.forEach((input) {
-      if (input.isP2wpkh) {
-        final p2wpkh = bitcoin
-            .P2WPKH(
-                data: generatePaymentData(hd: hd, index: input.address.index),
-                network: bitcoin.bitcoin)
-            .data;
-
-        txb.addInput(input.hash, input.vout, null, p2wpkh.output);
-      } else {
-        txb.addInput(input.hash, input.vout);
-      }
-    });
-
-    txb.addOutput(
-        addressToOutputScript(transactionCredentials.address), amount);
-
-    final estimatedSize = estimatedTransactionSize(inputs.length, 2);
-    final feeAmount = feeRate(transactionCredentials.priority) * estimatedSize;
-    final changeValue = totalInputAmount - amount - feeAmount;
-
-    if (changeValue > minAmount) {
-      txb.addOutput(changeAddress, changeValue);
-    }
-
-    for (var i = 0; i < inputs.length; i++) {
-      final input = inputs[i];
-      final keyPair = generateKeyPair(hd: hd, index: input.address.index);
-      final witnessValue = input.isP2wpkh ? input.value : null;
-
-      txb.sign(vin: i, keyPair: keyPair, witnessValue: witnessValue);
-    }
-
-    return PendingBitcoinTransaction(txb.build(),
-        eclient: eclient, amount: amount, fee: fee)
-      ..addListener((transaction) async {
-        transactionHistory.addOne(transaction);
-        await _updateBalance();
-      });
-  }
-
-  String toJSON() => json.encode({
-        'mnemonic': mnemonic,
-        'account_index': _accountIndex.toString(),
-        'addresses': addresses.map((addr) => addr.toJSON()).toList(),
-        'balance': balance?.toJSON()
-      });
-
-  int feeRate(TransactionPriority priority) {
-    if (priority is BitcoinTransactionPriority) {
-      return _feeRates[priority.raw];
-    }
-
-    return 0;
-  }
-
-  int feeAmountForPriority(BitcoinTransactionPriority priority, int inputsCount,
-          int outputsCount) =>
-      feeRate(priority) * estimatedTransactionSize(inputsCount, outputsCount);
-
-  @override
-  int calculateEstimatedFee(TransactionPriority priority, int amount) {
-    if (priority is BitcoinTransactionPriority) {
-      int inputsCount = 0;
-
-      if (amount != null) {
-        int totalValue = 0;
-
-        for (final input in _unspent) {
-          if (totalValue >= amount) {
-            break;
-          }
-
-          totalValue += input.value;
-          inputsCount += 1;
-        }
-      } else {
-        inputsCount = _unspent.length;
-      }
-      // If send all, then we have no change value
-      return feeAmountForPriority(
-          priority, inputsCount, amount != null ? 2 : 1);
-    }
-
-    return 0;
-  }
-
-  @override
-  Future<void> save() async {
-    await write(path: path, password: _password, data: toJSON());
-    await transactionHistory.save();
-  }
-
-  bitcoin.ECPair keyPairFor({@required int index}) =>
-      generateKeyPair(hd: hd, index: index);
-
-  @override
-  Future<void> rescan({int height}) async {
-    // FIXME: Unimplemented
-  }
-
-  @override
-  void close() async {
-    await eclient.close();
-  }
-
-  Future<void> _updateUnspent() async {
-    final unspent = await Future.wait(addresses.map((address) => eclient
-        .getListUnspentWithAddress(address.address)
-        .then((unspent) => unspent
-            .map((unspent) => BitcoinUnspent.fromJSON(address, unspent)))));
-    _unspent = unspent.expand((e) => e).toList();
-  }
-
-  void _subscribeForUpdates() {
-    scriptHashes.forEach((sh) async {
-      await _scripthashesUpdateSubject[sh]?.close();
-      _scripthashesUpdateSubject[sh] = eclient.scripthashUpdate(sh);
-      _scripthashesUpdateSubject[sh].listen((event) async {
-        try {
-          await _updateBalance();
-          await _updateUnspent();
-          transactionHistory.updateAsync();
-        } catch (e) {
-          print(e.toString());
-        }
-      });
-    });
-  }
-
-  Future<BitcoinBalance> _fetchBalances() async {
-    final balances = await Future.wait(
-        scriptHashes.map((sHash) => eclient.getBalance(sHash)));
-    final balance = balances.fold(
-        BitcoinBalance(confirmed: 0, unconfirmed: 0),
-        (BitcoinBalance acc, val) => BitcoinBalance(
-            confirmed: (val['confirmed'] as int ?? 0) + (acc.confirmed ?? 0),
-            unconfirmed:
-                (val['unconfirmed'] as int ?? 0) + (acc.unconfirmed ?? 0)));
-
-    return balance;
-  }
-
-  Future<void> _updateBalance() async {
-    balance = await _fetchBalances();
-    await save();
-  }
-
-  String _getAddress({@required int index}) =>
-      generateAddress(hd: hd, index: index);
 }

lib/bitcoin/bitcoin_wallet_service.dart

@@ -1,7 +1,6 @@
 import 'dart:io';
 import 'package:cake_wallet/bitcoin/bitcoin_mnemonic.dart';
 import 'package:cake_wallet/bitcoin/bitcoin_mnemonic_is_incorrect_exception.dart';
-import 'package:cake_wallet/bitcoin/file.dart';
 import 'package:cake_wallet/bitcoin/bitcoin_wallet_creation_credentials.dart';
 import 'package:cake_wallet/core/wallet_base.dart';
 import 'package:cake_wallet/core/wallet_service.dart';
@@ -19,44 +18,32 @@ class BitcoinWalletService extends WalletService<
 
   final Box<WalletInfo> walletInfoSource;
 
+  @override
+  WalletType getType() => WalletType.bitcoin;
+
   @override
   Future<BitcoinWallet> create(BitcoinNewWalletCredentials credentials) async {
-    final dirPath = await pathForWalletDir(
+    final wallet = BitcoinWallet(
-        type: WalletType.bitcoin, name: credentials.name);
+        mnemonic: await generateMnemonic(),
-    final wallet = BitcoinWalletBase.build(
-        dirPath: dirPath,
-        mnemonic: generateMnemonic(),
         password: credentials.password,
-        name: credentials.name,
         walletInfo: credentials.walletInfo);
     await wallet.save();
     await wallet.init();
-
     return wallet;
   }
 
   @override
   Future<bool> isWalletExit(String name) async =>
-      File(await pathForWallet(name: name, type: WalletType.bitcoin))
+      File(await pathForWallet(name: name, type: getType())).existsSync();
-          .existsSync();
 
   @override
   Future<BitcoinWallet> openWallet(String name, String password) async {
-    final walletDirPath =
-        await pathForWalletDir(name: name, type: WalletType.bitcoin);
-    final walletPath = '$walletDirPath/$name';
-    final walletJSONRaw = await read(path: walletPath, password: password);
     final walletInfo = walletInfoSource.values.firstWhere(
-            (info) => info.id == WalletBase.idFor(name, WalletType.bitcoin),
+        (info) => info.id == WalletBase.idFor(name, getType()),
         orElse: () => null);
-    final wallet = BitcoinWalletBase.fromJSON(
+    final wallet = await BitcoinWalletBase.open(
-        password: password,
+        password: password, name: name, walletInfo: walletInfo);
-        name: name,
-        dirPath: walletDirPath,
-        jsonSource: walletJSONRaw,
-        walletInfo: walletInfo);
     await wallet.init();
-
     return wallet;
   }
 
@@ -67,10 +54,8 @@ class BitcoinWalletService extends WalletService<
 
   @override
   Future<BitcoinWallet> restoreFromKeys(
-      BitcoinRestoreWalletFromWIFCredentials credentials) async {
+          BitcoinRestoreWalletFromWIFCredentials credentials) async =>
-    // TODO: implement restoreFromKeys
+      throw UnimplementedError();
-    throw UnimplementedError();
-  }
 
   @override
   Future<BitcoinWallet> restoreFromSeed(
@@ -79,17 +64,12 @@ class BitcoinWalletService extends WalletService<
       throw BitcoinMnemonicIsIncorrectException();
     }
 
-    final dirPath = await pathForWalletDir(
+    final wallet = BitcoinWallet(
-        type: WalletType.bitcoin, name: credentials.name);
-    final wallet = BitcoinWalletBase.build(
-        dirPath: dirPath,
-        name: credentials.name,
         password: credentials.password,
         mnemonic: credentials.mnemonic,
         walletInfo: credentials.walletInfo);
     await wallet.save();
     await wallet.init();
-
     return wallet;
   }
 }

lib/bitcoin/electrum.dart

@@ -2,21 +2,12 @@ import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'dart:typed_data';
+import 'package:bitcoin_flutter/bitcoin_flutter.dart';
 import 'package:cake_wallet/bitcoin/bitcoin_amount_format.dart';
 import 'package:cake_wallet/bitcoin/script_hash.dart';
 import 'package:flutter/foundation.dart';
 import 'package:rxdart/rxdart.dart';
 
-class UriParseException implements Exception {
-  UriParseException(this.uri);
-
-  final String uri;
-
-  @override
-  String toString() =>
-      'Cannot parse host and port from uri. Invalid uri format. Uri: $uri';
-}
-
 String jsonrpcparams(List<Object> params) {
   final _params = params?.map((val) => '"${val.toString()}"')?.join(',');
   return '[$_params]';
@@ -53,17 +44,8 @@ class ElectrumClient {
   Timer _aliveTimer;
   String unterminatedString;
 
-  Future<void> connectToUri(String uri) async {
+  Future<void> connectToUri(Uri uri) async =>
-    final splittedUri = uri.split(':');
+    await connect(host: uri.host, port: uri.port);
-
-    if (splittedUri.length != 2) {
-      throw UriParseException(uri);
-    }
-
-    final host = splittedUri.first;
-    final port = int.parse(splittedUri.last);
-    await connect(host: host, port: port);
-  }
 
   Future<void> connect({@required String host, @required int port}) async {
     try {
@@ -173,10 +155,11 @@ class ElectrumClient {
       });
 
   Future<List<Map<String, dynamic>>> getListUnspentWithAddress(
-          String address) =>
+          String address, NetworkType networkType) =>
       call(
-          method: 'blockchain.scripthash.listunspent',
+              method: 'blockchain.scripthash.listunspent',
-          params: [scriptHash(address)]).then((dynamic result) {
+              params: [scriptHash(address, networkType: networkType)])
+          .then((dynamic result) {
         if (result is List) {
           return result.map((dynamic val) {
             if (val is Map<String, Object>) {
@@ -259,7 +242,7 @@ class ElectrumClient {
         if (result is String) {
           return result;
         }
-        print(result);
+
         return '';
       });
 
@@ -303,14 +286,24 @@ class ElectrumClient {
       });
 
   Future<List<int>> feeRates() async {
-    final topDoubleString = await estimatefee(p: 1);
+    try {
-    final middleDoubleString = await estimatefee(p: 20);
+      final topDoubleString = await estimatefee(p: 1);
-    final bottomDoubleString = await estimatefee(p: 150);
+      final middleDoubleString = await estimatefee(p: 20);
-    final top = (stringDoubleToBitcoinAmount(topDoubleString.toString()) / 1000).round();
+      final bottomDoubleString = await estimatefee(p: 100);
-    final middle = (stringDoubleToBitcoinAmount(middleDoubleString.toString()) / 1000).round();
+      final top =
-    final bottom = (stringDoubleToBitcoinAmount(bottomDoubleString.toString()) / 1000).round();
+          (stringDoubleToBitcoinAmount(topDoubleString.toString()) / 1000)
+              .round();
+      final middle =
+          (stringDoubleToBitcoinAmount(middleDoubleString.toString()) / 1000)
+              .round();
+      final bottom =
+          (stringDoubleToBitcoinAmount(bottomDoubleString.toString()) / 1000)
+              .round();
 
-    return [bottom, middle, top];
+      return [bottom, middle, top];
+    } catch (_) {
+      return [];
+    }
   }
 
   BehaviorSubject<Object> scripthashUpdate(String scripthash) {

lib/bitcoin/electrum_balance.dart

@@ -1,21 +1,20 @@
 import 'dart:convert';
-
 import 'package:flutter/foundation.dart';
 import 'package:cake_wallet/bitcoin/bitcoin_amount_format.dart';
 import 'package:cake_wallet/entities/balance.dart';
 
-class BitcoinBalance extends Balance {
+class ElectrumBalance extends Balance {
-  const BitcoinBalance({@required this.confirmed, @required this.unconfirmed})
+  const ElectrumBalance({@required this.confirmed, @required this.unconfirmed})
       : super(confirmed, unconfirmed);
 
-  factory BitcoinBalance.fromJSON(String jsonSource) {
+  factory ElectrumBalance.fromJSON(String jsonSource) {
     if (jsonSource == null) {
       return null;
     }
 
     final decoded = json.decode(jsonSource) as Map;
 
-    return BitcoinBalance(
+    return ElectrumBalance(
         confirmed: decoded['confirmed'] as int ?? 0,
         unconfirmed: decoded['unconfirmed'] as int ?? 0);
   }
@@ -24,7 +23,8 @@ class BitcoinBalance extends Balance {
   final int unconfirmed;
 
   @override
-  String get formattedAvailableBalance => bitcoinAmountToString(amount: confirmed);
+  String get formattedAvailableBalance =>
+      bitcoinAmountToString(amount: confirmed);
 
   @override
   String get formattedAdditionalBalance =>

lib/bitcoin/electrum_transaction_history.dart

@@ -0,0 +1,98 @@
+import 'dart:convert';
+import 'package:cake_wallet/entities/pathForWallet.dart';
+import 'package:cake_wallet/entities/wallet_info.dart';
+import 'package:flutter/foundation.dart';
+import 'package:mobx/mobx.dart';
+import 'package:cake_wallet/core/transaction_history.dart';
+import 'package:cake_wallet/bitcoin/file.dart';
+import 'package:cake_wallet/bitcoin/electrum_transaction_info.dart';
+
+part 'electrum_transaction_history.g.dart';
+
+const _transactionsHistoryFileName = 'transactions.json';
+
+class ElectrumTransactionHistory = ElectrumTransactionHistoryBase
+    with _$ElectrumTransactionHistory;
+
+abstract class ElectrumTransactionHistoryBase
+    extends TransactionHistoryBase<ElectrumTransactionInfo> with Store {
+  ElectrumTransactionHistoryBase(
+      {@required this.walletInfo, @required String password})
+      : _password = password,
+        _height = 0 {
+    transactions = ObservableMap<String, ElectrumTransactionInfo>();
+  }
+
+  final WalletInfo walletInfo;
+  final String _password;
+  int _height;
+
+  Future<void> init() async => await _load();
+
+  @override
+  void addOne(ElectrumTransactionInfo transaction) =>
+      transactions[transaction.id] = transaction;
+
+  @override
+  void addMany(Map<String, ElectrumTransactionInfo> transactions) =>
+      this.transactions.addAll(transactions);
+
+  @override
+  Future<void> save() async {
+    try {
+      final dirPath =
+          await pathForWalletDir(name: walletInfo.name, type: walletInfo.type);
+      final path = '$dirPath/$_transactionsHistoryFileName';
+      final data =
+          json.encode({'height': _height, 'transactions': transactions});
+      await writeData(path: path, password: _password, data: data);
+    } catch (e) {
+      print('Error while save bitcoin transaction history: ${e.toString()}');
+    }
+  }
+
+  Future<Map<String, Object>> _read() async {
+    final dirPath =
+        await pathForWalletDir(name: walletInfo.name, type: walletInfo.type);
+    final path = '$dirPath/$_transactionsHistoryFileName';
+    final content = await read(path: path, password: _password);
+    return json.decode(content) as Map<String, Object>;
+  }
+
+  Future<void> _load() async {
+    try {
+      final content = await _read();
+      final txs = content['transactions'] as Map<String, Object> ?? {};
+
+      txs.entries.forEach((entry) {
+        final val = entry.value;
+
+        if (val is Map<String, Object>) {
+          final tx = ElectrumTransactionInfo.fromJson(val, walletInfo.type);
+          _updateOrInsert(tx);
+        }
+      });
+
+      _height = content['height'] as int;
+    } catch (e) {
+      print(e);
+    }
+  }
+
+  void _updateOrInsert(ElectrumTransactionInfo transaction) {
+    if (transaction.id == null) {
+      return;
+    }
+
+    if (transactions[transaction.id] == null) {
+      transactions[transaction.id] = transaction;
+    } else {
+      final originalTx = transactions[transaction.id];
+      originalTx.confirmations = transaction.confirmations;
+      originalTx.amount = transaction.amount;
+      originalTx.height = transaction.height;
+      originalTx.date ??= transaction.date;
+      originalTx.isPending = transaction.isPending;
+    }
+  }
+}

lib/bitcoin/electrum_transaction_info.dart

@@ -6,9 +6,10 @@ import 'package:cake_wallet/bitcoin/bitcoin_amount_format.dart';
 import 'package:cake_wallet/entities/transaction_direction.dart';
 import 'package:cake_wallet/entities/transaction_info.dart';
 import 'package:cake_wallet/entities/format_amount.dart';
+import 'package:cake_wallet/entities/wallet_type.dart';
 
-class BitcoinTransactionInfo extends TransactionInfo {
+class ElectrumTransactionInfo extends TransactionInfo {
-  BitcoinTransactionInfo(
+  ElectrumTransactionInfo(this.type,
       {@required String id,
       @required int height,
       @required int amount,
@@ -27,7 +28,8 @@ class BitcoinTransactionInfo extends TransactionInfo {
     this.confirmations = confirmations;
   }
 
-  factory BitcoinTransactionInfo.fromElectrumVerbose(Map<String, Object> obj,
+  factory ElectrumTransactionInfo.fromElectrumVerbose(
+      Map<String, Object> obj, WalletType type,
       {@required List<BitcoinAddressRecord> addresses, @required int height}) {
     final addressesSet = addresses.map((addr) => addr.address).toSet();
     final id = obj['txid'] as String;
@@ -47,7 +49,8 @@ class BitcoinTransactionInfo extends TransactionInfo {
       final out = vin['tx']['vout'][vout] as Map;
       final outAddresses =
           (out['scriptPubKey']['addresses'] as List<Object>)?.toSet();
-      inputsAmount += stringDoubleToBitcoinAmount((out['value'] as double ?? 0).toString());
+      inputsAmount +=
+          stringDoubleToBitcoinAmount((out['value'] as double ?? 0).toString());
 
       if (outAddresses?.intersection(addressesSet)?.isNotEmpty ?? false) {
         direction = TransactionDirection.outgoing;
@@ -58,7 +61,8 @@ class BitcoinTransactionInfo extends TransactionInfo {
       final outAddresses =
           out['scriptPubKey']['addresses'] as List<Object> ?? [];
       final ntrs = outAddresses.toSet().intersection(addressesSet);
-      final value = stringDoubleToBitcoinAmount((out['value'] as double ?? 0.0).toString());
+      final value = stringDoubleToBitcoinAmount(
+          (out['value'] as double ?? 0.0).toString());
       totalOutAmount += value;
 
       if ((direction == TransactionDirection.incoming && ntrs.isNotEmpty) ||
@@ -69,7 +73,7 @@ class BitcoinTransactionInfo extends TransactionInfo {
 
     final fee = inputsAmount - totalOutAmount;
 
-    return BitcoinTransactionInfo(
+    return ElectrumTransactionInfo(type,
         id: id,
         height: height,
         isPending: false,
@@ -80,7 +84,7 @@ class BitcoinTransactionInfo extends TransactionInfo {
         confirmations: confirmations);
   }
 
-  factory BitcoinTransactionInfo.fromHexAndHeader(String hex,
+  factory ElectrumTransactionInfo.fromHexAndHeader(WalletType type, String hex,
       {List<String> addresses, int height, int timestamp, int confirmations}) {
     final tx = bitcoin.Transaction.fromHex(hex);
     var exist = false;
@@ -104,7 +108,7 @@ class BitcoinTransactionInfo extends TransactionInfo {
         ? DateTime.fromMillisecondsSinceEpoch(timestamp * 1000)
         : DateTime.now();
 
-    return BitcoinTransactionInfo(
+    return ElectrumTransactionInfo(type,
         id: tx.getId(),
         height: height,
         isPending: false,
@@ -115,8 +119,9 @@ class BitcoinTransactionInfo extends TransactionInfo {
         confirmations: confirmations);
   }
 
-  factory BitcoinTransactionInfo.fromJson(Map<String, dynamic> data) {
+  factory ElectrumTransactionInfo.fromJson(
-    return BitcoinTransactionInfo(
+      Map<String, dynamic> data, WalletType type) {
+    return ElectrumTransactionInfo(type,
         id: data['id'] as String,
         height: data['height'] as int,
         amount: data['amount'] as int,
@@ -127,15 +132,17 @@ class BitcoinTransactionInfo extends TransactionInfo {
         confirmations: data['confirmations'] as int);
   }
 
+  final WalletType type;
+
   String _fiatAmount;
 
   @override
   String amountFormatted() =>
-      '${formatAmount(bitcoinAmountToString(amount: amount))} BTC';
+      '${formatAmount(bitcoinAmountToString(amount: amount))} ${walletTypeToCryptoCurrency(type).title}';
 
   @override
   String feeFormatted() => fee != null
-      ? '${formatAmount(bitcoinAmountToString(amount: fee))} BTC'
+      ? '${formatAmount(bitcoinAmountToString(amount: fee))} ${walletTypeToCryptoCurrency(type).title}'
       : '';
 
   @override
@@ -144,8 +151,8 @@ class BitcoinTransactionInfo extends TransactionInfo {
   @override
   void changeFiatAmount(String amount) => _fiatAmount = formatAmount(amount);
 
-  BitcoinTransactionInfo updated(BitcoinTransactionInfo info) {
+  ElectrumTransactionInfo updated(ElectrumTransactionInfo info) {
-    return BitcoinTransactionInfo(
+    return ElectrumTransactionInfo(info.type,
         id: id,
         height: info.height,
         amount: info.amount,

lib/bitcoin/electrum_wallet.dart

@@ -0,0 +1,467 @@
+import 'dart:async';
+import 'dart:convert';
+import 'package:mobx/mobx.dart';
+import 'package:rxdart/subjects.dart';
+import 'package:flutter/foundation.dart';
+import 'package:bitcoin_flutter/bitcoin_flutter.dart' as bitcoin;
+import 'package:cake_wallet/bitcoin/electrum_transaction_info.dart';
+import 'package:cake_wallet/entities/pathForWallet.dart';
+import 'package:cake_wallet/bitcoin/address_to_output_script.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_address_record.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_amount_format.dart';
+import 'package:cake_wallet/bitcoin/electrum_balance.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_mnemonic.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_transaction_credentials.dart';
+import 'package:cake_wallet/bitcoin/electrum_transaction_history.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_transaction_no_inputs_exception.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_transaction_priority.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_transaction_wrong_balance_exception.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_unspent.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_wallet_keys.dart';
+import 'package:cake_wallet/bitcoin/file.dart';
+import 'package:cake_wallet/bitcoin/pending_bitcoin_transaction.dart';
+import 'package:cake_wallet/bitcoin/script_hash.dart';
+import 'package:cake_wallet/bitcoin/utils.dart';
+import 'package:cake_wallet/core/wallet_base.dart';
+import 'package:cake_wallet/entities/node.dart';
+import 'package:cake_wallet/entities/sync_status.dart';
+import 'package:cake_wallet/entities/transaction_priority.dart';
+import 'package:cake_wallet/entities/wallet_info.dart';
+import 'package:cake_wallet/bitcoin/electrum.dart';
+
+part 'electrum_wallet.g.dart';
+
+class ElectrumWallet = ElectrumWalletBase with _$ElectrumWallet;
+
+abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
+    ElectrumTransactionHistory, ElectrumTransactionInfo> with Store {
+  ElectrumWalletBase(
+      {@required String password,
+      @required WalletInfo walletInfo,
+      @required List<BitcoinAddressRecord> initialAddresses,
+      @required this.networkType,
+      @required this.mnemonic,
+      ElectrumClient electrumClient,
+      int accountIndex = 0,
+      ElectrumBalance initialBalance})
+      : balance = initialBalance ??
+            const ElectrumBalance(confirmed: 0, unconfirmed: 0),
+        hd = bitcoin.HDWallet.fromSeed(mnemonicToSeedBytes(mnemonic),
+                network: networkType)
+            .derivePath("m/0'/0"),
+        addresses = ObservableList<BitcoinAddressRecord>.of(
+            (initialAddresses ?? []).toSet()),
+        syncStatus = NotConnectedSyncStatus(),
+        _password = password,
+        _accountIndex = accountIndex,
+        _feeRates = <int>[],
+        _isTransactionUpdating = false,
+        super(walletInfo) {
+    this.electrumClient = electrumClient ?? ElectrumClient();
+    this.walletInfo = walletInfo;
+    transactionHistory =
+        ElectrumTransactionHistory(walletInfo: walletInfo, password: password);
+    _unspent = [];
+    _scripthashesUpdateSubject = {};
+  }
+
+  static int estimatedTransactionSize(int inputsCount, int outputsCounts) =>
+      inputsCount * 146 + outputsCounts * 33 + 8;
+
+  final bitcoin.HDWallet hd;
+  final String mnemonic;
+
+  ElectrumClient electrumClient;
+
+  @override
+  @observable
+  String address;
+
+  @override
+  @observable
+  ElectrumBalance balance;
+
+  @override
+  @observable
+  SyncStatus syncStatus;
+
+  ObservableList<BitcoinAddressRecord> addresses;
+
+  List<String> get scriptHashes => addresses
+      .map((addr) => scriptHash(addr.address, networkType: networkType))
+      .toList();
+
+  String get xpub => hd.base58;
+
+  @override
+  String get seed => mnemonic;
+
+  bitcoin.NetworkType networkType;
+
+  @override
+  BitcoinWalletKeys get keys => BitcoinWalletKeys(
+      wif: hd.wif, privateKey: hd.privKey, publicKey: hd.pubKey);
+
+  final String _password;
+  List<BitcoinUnspent> _unspent;
+  List<int> _feeRates;
+  int _accountIndex;
+  Map<String, BehaviorSubject<Object>> _scripthashesUpdateSubject;
+  bool _isTransactionUpdating;
+
+  Future<void> init() async {
+    await generateAddresses();
+    address = addresses[_accountIndex].address;
+    await transactionHistory.init();
+  }
+
+  @action
+  Future<void> nextAddress() async {
+    _accountIndex += 1;
+
+    if (_accountIndex >= addresses.length) {
+      _accountIndex = 0;
+    }
+
+    address = addresses[_accountIndex].address;
+
+    await save();
+  }
+
+  Future<void> generateAddresses() async {
+    if (addresses.length < 33) {
+      final addressesCount = 33 - addresses.length;
+      await generateNewAddresses(addressesCount,
+          startIndex: addresses.length, hd: hd);
+    }
+  }
+
+  Future<BitcoinAddressRecord> generateNewAddress(
+      {bool isHidden = false, bitcoin.HDWallet hd}) async {
+    _accountIndex += 1;
+    final _hd = hd ?? this.hd;
+    final address = BitcoinAddressRecord(
+        getAddress(index: _accountIndex, hd: _hd),
+        index: _accountIndex,
+        isHidden: isHidden);
+    addresses.add(address);
+    await save();
+    return address;
+  }
+
+  Future<List<BitcoinAddressRecord>> generateNewAddresses(int count,
+      {int startIndex = 0, bitcoin.HDWallet hd, bool isHidden = false}) async {
+    final list = <BitcoinAddressRecord>[];
+
+    for (var i = startIndex; i < count + startIndex; i++) {
+      final address = BitcoinAddressRecord(getAddress(index: i, hd: hd),
+          index: i, isHidden: isHidden);
+      list.add(address);
+    }
+
+    addresses.addAll(list);
+    await save();
+    return list;
+  }
+
+  Future<void> updateAddress(String address) async {
+    for (final addr in addresses) {
+      if (addr.address == address) {
+        await save();
+        break;
+      }
+    }
+  }
+
+  @action
+  @override
+  Future<void> startSync() async {
+    try {
+      syncStatus = StartingSyncStatus();
+      updateTransactions();
+      _subscribeForUpdates();
+      await _updateBalance();
+      await _updateUnspent();
+      _feeRates = await electrumClient.feeRates();
+
+      Timer.periodic(const Duration(minutes: 1),
+          (timer) async => _feeRates = await electrumClient.feeRates());
+
+      syncStatus = SyncedSyncStatus();
+    } catch (e) {
+      print(e.toString());
+      syncStatus = FailedSyncStatus();
+    }
+  }
+
+  @action
+  @override
+  Future<void> connectToNode({@required Node node}) async {
+    try {
+      syncStatus = ConnectingSyncStatus();
+      await electrumClient.connectToUri(node.uri);
+      electrumClient.onConnectionStatusChange = (bool isConnected) {
+        if (!isConnected) {
+          syncStatus = LostConnectionSyncStatus();
+        }
+      };
+      syncStatus = ConnectedSyncStatus();
+    } catch (e) {
+      print(e.toString());
+      syncStatus = FailedSyncStatus();
+    }
+  }
+
+  @override
+  Future<PendingBitcoinTransaction> createTransaction(
+      Object credentials) async {
+    const minAmount = 546;
+    final transactionCredentials = credentials as BitcoinTransactionCredentials;
+    final inputs = <BitcoinUnspent>[];
+    final allAmountFee =
+        calculateEstimatedFee(transactionCredentials.priority, null);
+    final allAmount = balance.confirmed - allAmountFee;
+    var fee = 0;
+    final credentialsAmount = transactionCredentials.amount != null
+        ? stringDoubleToBitcoinAmount(transactionCredentials.amount)
+        : 0;
+    final amount = transactionCredentials.amount == null ||
+            allAmount - credentialsAmount < minAmount
+        ? allAmount
+        : credentialsAmount;
+    final txb = bitcoin.TransactionBuilder(network: networkType);
+    final changeAddress = address;
+    var leftAmount = amount;
+    var totalInputAmount = 0;
+
+    if (_unspent.isEmpty) {
+      await _updateUnspent();
+    }
+
+    for (final utx in _unspent) {
+      leftAmount = leftAmount - utx.value;
+      totalInputAmount += utx.value;
+      inputs.add(utx);
+
+      if (leftAmount <= 0) {
+        break;
+      }
+    }
+
+    if (inputs.isEmpty) {
+      throw BitcoinTransactionNoInputsException();
+    }
+
+    final totalAmount = amount + fee;
+    fee = transactionCredentials.amount != null
+        ? feeAmountForPriority(transactionCredentials.priority, inputs.length,
+            amount == allAmount ? 1 : 2)
+        : allAmountFee;
+
+    if (totalAmount > balance.confirmed) {
+      throw BitcoinTransactionWrongBalanceException();
+    }
+
+    if (amount <= 0 || totalInputAmount < amount) {
+      throw BitcoinTransactionWrongBalanceException();
+    }
+
+    txb.setVersion(1);
+
+    inputs.forEach((input) {
+      if (input.isP2wpkh) {
+        final p2wpkh = bitcoin
+            .P2WPKH(
+                data: generatePaymentData(hd: hd, index: input.address.index),
+                network: networkType)
+            .data;
+
+        txb.addInput(input.hash, input.vout, null, p2wpkh.output);
+      } else {
+        txb.addInput(input.hash, input.vout);
+      }
+    });
+
+    txb.addOutput(
+        addressToOutputScript(transactionCredentials.address, networkType),
+        amount);
+
+    final estimatedSize = estimatedTransactionSize(inputs.length, 2);
+    final feeAmount = feeRate(transactionCredentials.priority) * estimatedSize;
+    final changeValue = totalInputAmount - amount - feeAmount;
+
+    if (changeValue > minAmount) {
+      txb.addOutput(changeAddress, changeValue);
+    }
+
+    for (var i = 0; i < inputs.length; i++) {
+      final input = inputs[i];
+      final keyPair = generateKeyPair(
+          hd: hd, index: input.address.index, network: networkType);
+      final witnessValue = input.isP2wpkh ? input.value : null;
+
+      txb.sign(vin: i, keyPair: keyPair, witnessValue: witnessValue);
+    }
+
+    return PendingBitcoinTransaction(txb.build(), type,
+        electrumClient: electrumClient, amount: amount, fee: fee)
+      ..addListener((transaction) async {
+        transactionHistory.addOne(transaction);
+        await _updateBalance();
+      });
+  }
+
+  String toJSON() => json.encode({
+        'mnemonic': mnemonic,
+        'account_index': _accountIndex.toString(),
+        'addresses': addresses.map((addr) => addr.toJSON()).toList(),
+        'balance': balance?.toJSON()
+      });
+
+  int feeRate(TransactionPriority priority) {
+    if (priority is BitcoinTransactionPriority) {
+      return _feeRates[priority.raw];
+    }
+
+    return 0;
+  }
+
+  int feeAmountForPriority(BitcoinTransactionPriority priority, int inputsCount,
+          int outputsCount) =>
+      feeRate(priority) * estimatedTransactionSize(inputsCount, outputsCount);
+
+  @override
+  int calculateEstimatedFee(TransactionPriority priority, int amount) {
+    if (priority is BitcoinTransactionPriority) {
+      int inputsCount = 0;
+
+      if (amount != null) {
+        int totalValue = 0;
+
+        for (final input in _unspent) {
+          if (totalValue >= amount) {
+            break;
+          }
+
+          totalValue += input.value;
+          inputsCount += 1;
+        }
+      } else {
+        inputsCount = _unspent.length;
+      }
+      // If send all, then we have no change value
+      return feeAmountForPriority(
+          priority, inputsCount, amount != null ? 2 : 1);
+    }
+
+    return 0;
+  }
+
+  @override
+  Future<void> save() async {
+    final path = await makePath();
+    await write(path: path, password: _password, data: toJSON());
+    await transactionHistory.save();
+  }
+
+  bitcoin.ECPair keyPairFor({@required int index}) =>
+      generateKeyPair(hd: hd, index: index, network: networkType);
+
+  @override
+  Future<void> rescan({int height}) async => throw UnimplementedError();
+
+  @override
+  Future<void> close() async {
+    try {
+      await electrumClient?.close();
+    } catch (_) {}
+  }
+
+  String getAddress({@required int index, @required bitcoin.HDWallet hd}) => '';
+
+  Future<String> makePath() async =>
+      pathForWallet(name: walletInfo.name, type: walletInfo.type);
+
+  Future<void> _updateUnspent() async {
+    final unspent = await Future.wait(addresses.map((address) => electrumClient
+        .getListUnspentWithAddress(address.address, networkType)
+        .then((unspent) => unspent
+            .map((unspent) => BitcoinUnspent.fromJSON(address, unspent)))));
+    _unspent = unspent.expand((e) => e).toList();
+  }
+
+  Future<ElectrumTransactionInfo> fetchTransactionInfo(
+      {@required String hash, @required int height}) async {
+    final tx = await electrumClient.getTransactionExpanded(hash: hash);
+    return ElectrumTransactionInfo.fromElectrumVerbose(tx, walletInfo.type,
+        height: height, addresses: addresses);
+  }
+
+  @override
+  Future<Map<String, ElectrumTransactionInfo>> fetchTransactions() async {
+    final histories =
+        scriptHashes.map((scriptHash) => electrumClient.getHistory(scriptHash));
+    final _historiesWithDetails = await Future.wait(histories)
+        .then((histories) => histories.expand((i) => i).toList())
+        .then((histories) => histories.map((tx) => fetchTransactionInfo(
+            hash: tx['tx_hash'] as String, height: tx['height'] as int)));
+    final historiesWithDetails = await Future.wait(_historiesWithDetails);
+
+    return historiesWithDetails.fold<Map<String, ElectrumTransactionInfo>>(
+        <String, ElectrumTransactionInfo>{}, (acc, tx) {
+      acc[tx.id] = acc[tx.id]?.updated(tx) ?? tx;
+      return acc;
+    });
+  }
+
+  Future<void> updateTransactions() async {
+    try {
+      if (_isTransactionUpdating) {
+        return;
+      }
+
+      _isTransactionUpdating = true;
+      final transactions = await fetchTransactions();
+      transactionHistory.addMany(transactions);
+      await transactionHistory.save();
+      _isTransactionUpdating = false;
+    } catch (e) {
+      print(e);
+      _isTransactionUpdating = false;
+    }
+  }
+
+  void _subscribeForUpdates() {
+    scriptHashes.forEach((sh) async {
+      await _scripthashesUpdateSubject[sh]?.close();
+      _scripthashesUpdateSubject[sh] = electrumClient.scripthashUpdate(sh);
+      _scripthashesUpdateSubject[sh].listen((event) async {
+        try {
+          await _updateBalance();
+          await _updateUnspent();
+          await updateTransactions();
+        } catch (e) {
+          print(e.toString());
+        }
+      });
+    });
+  }
+
+  Future<ElectrumBalance> _fetchBalances() async {
+    final balances = await Future.wait(
+        scriptHashes.map((sh) => electrumClient.getBalance(sh)));
+    final balance = balances.fold(
+        ElectrumBalance(confirmed: 0, unconfirmed: 0),
+        (ElectrumBalance acc, val) => ElectrumBalance(
+            confirmed: (val['confirmed'] as int ?? 0) + (acc.confirmed ?? 0),
+            unconfirmed:
+                (val['unconfirmed'] as int ?? 0) + (acc.unconfirmed ?? 0)));
+
+    return balance;
+  }
+
+  Future<void> _updateBalance() async {
+    balance = await _fetchBalances();
+    await save();
+  }
+}

lib/bitcoin/electrum_wallet_snapshot.dart

@@ -0,0 +1,42 @@
+import 'dart:convert';
+import 'package:cake_wallet/bitcoin/bitcoin_address_record.dart';
+import 'package:cake_wallet/bitcoin/electrum_balance.dart';
+import 'package:cake_wallet/bitcoin/file.dart';
+import 'package:cake_wallet/entities/pathForWallet.dart';
+import 'package:cake_wallet/entities/wallet_type.dart';
+
+class ElectrumWallletSnapshot {
+  ElectrumWallletSnapshot(this.name, this.type, this.password);
+
+  final String name;
+  final String password;
+  final WalletType type;
+
+  String mnemonic;
+  List<BitcoinAddressRecord> addresses;
+  ElectrumBalance balance;
+  int accountIndex;
+
+  Future<void> load() async {
+    try {
+      final path = await pathForWallet(name: name, type: type);
+      final jsonSource = await read(path: path, password: password);
+      final data = json.decode(jsonSource) as Map;
+      final addressesTmp = data['addresses'] as List ?? <Object>[];
+      mnemonic = data['mnemonic'] as String;
+      addresses = addressesTmp
+          .whereType<String>()
+          .map((addr) => BitcoinAddressRecord.fromJSON(addr))
+          .toList();
+      balance = ElectrumBalance.fromJSON(data['balance'] as String) ??
+          ElectrumBalance(confirmed: 0, unconfirmed: 0);
+      accountIndex = 0;
+
+      try {
+        accountIndex = int.parse(data['account_index'] as String);
+      } catch (_) {}
+    } catch (e) {
+      print(e);
+    }
+  }
+}

lib/bitcoin/litecoin_network.dart

@@ -0,0 +1,9 @@
+import 'package:bitcoin_flutter/bitcoin_flutter.dart';
+
+final litecoinNetwork = NetworkType(
+    messagePrefix: '\x19Litecoin Signed Message:\n',
+    bech32: 'ltc',
+    bip32: Bip32Type(public: 0x0488b21e, private: 0x0488ade4),
+    pubKeyHash: 0x30,
+    scriptHash: 0x32,
+    wif: 0xb0);

lib/bitcoin/litecoin_wallet.dart

@@ -0,0 +1,88 @@
+import 'package:bitcoin_flutter/bitcoin_flutter.dart' as bitcoin;
+import 'package:cake_wallet/bitcoin/bitcoin_mnemonic.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_transaction_priority.dart';
+import 'package:cake_wallet/entities/transaction_priority.dart';
+import 'package:flutter/foundation.dart';
+import 'package:mobx/mobx.dart';
+import 'package:cake_wallet/entities/wallet_info.dart';
+import 'package:cake_wallet/bitcoin/electrum_wallet_snapshot.dart';
+import 'package:cake_wallet/bitcoin/electrum_wallet.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_address_record.dart';
+import 'package:cake_wallet/bitcoin/electrum_balance.dart';
+import 'package:cake_wallet/bitcoin/litecoin_network.dart';
+import 'package:cake_wallet/bitcoin/utils.dart';
+
+part 'litecoin_wallet.g.dart';
+
+class LitecoinWallet = LitecoinWalletBase with _$LitecoinWallet;
+
+abstract class LitecoinWalletBase extends ElectrumWallet with Store {
+  LitecoinWalletBase(
+      {@required String mnemonic,
+      @required String password,
+      @required WalletInfo walletInfo,
+      List<BitcoinAddressRecord> initialAddresses,
+      ElectrumBalance initialBalance,
+      int accountIndex = 0})
+      : super(
+            mnemonic: mnemonic,
+            password: password,
+            walletInfo: walletInfo,
+            networkType: litecoinNetwork,
+            initialAddresses: initialAddresses,
+            initialBalance: initialBalance,
+            accountIndex: accountIndex);
+
+  static Future<LitecoinWallet> open({
+    @required String name,
+    @required WalletInfo walletInfo,
+    @required String password,
+  }) async {
+    final snp = ElectrumWallletSnapshot(name, walletInfo.type, password);
+    await snp.load();
+    return LitecoinWallet(
+        mnemonic: snp.mnemonic,
+        password: password,
+        walletInfo: walletInfo,
+        initialAddresses: snp.addresses,
+        initialBalance: snp.balance,
+        accountIndex: snp.accountIndex);
+  }
+
+  @override
+  String getAddress({@required int index, @required bitcoin.HDWallet hd}) =>
+      generateP2WPKHAddress(hd: hd, index: index, networkType: networkType);
+
+  @override
+  Future<void> generateAddresses() async {
+    if (addresses.length < 33) {
+      final addressesCount = 22 - addresses.length;
+      await generateNewAddresses(addressesCount,
+          hd: hd, startIndex: addresses.length);
+
+      final changeRoot = bitcoin.HDWallet.fromSeed(
+              mnemonicToSeedBytes(mnemonic),
+              network: networkType)
+          .derivePath("m/0'/1");
+
+      await generateNewAddresses(11,
+          startIndex: 0, hd: changeRoot, isHidden: true);
+    }
+  }
+
+  @override
+  int feeRate(TransactionPriority priority) {
+    if (priority is LitecoinTransactionPriority) {
+      switch (priority) {
+        case LitecoinTransactionPriority.slow:
+          return 1;
+        case LitecoinTransactionPriority.medium:
+          return 2;
+        case LitecoinTransactionPriority.fast:
+          return 3;
+      }
+    }
+
+    return 0;
+  }
+}

lib/bitcoin/litecoin_wallet_service.dart

@@ -0,0 +1,76 @@
+import 'dart:io';
+import 'package:hive/hive.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_mnemonic.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_mnemonic_is_incorrect_exception.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_wallet_creation_credentials.dart';
+import 'package:cake_wallet/bitcoin/litecoin_wallet.dart';
+import 'package:cake_wallet/core/wallet_service.dart';
+import 'package:cake_wallet/entities/pathForWallet.dart';
+import 'package:cake_wallet/entities/wallet_type.dart';
+import 'package:cake_wallet/entities/wallet_info.dart';
+import 'package:cake_wallet/core/wallet_base.dart';
+
+class LitecoinWalletService extends WalletService<
+    BitcoinNewWalletCredentials,
+    BitcoinRestoreWalletFromSeedCredentials,
+    BitcoinRestoreWalletFromWIFCredentials> {
+  LitecoinWalletService(this.walletInfoSource);
+
+  final Box<WalletInfo> walletInfoSource;
+
+  @override
+  WalletType getType() => WalletType.litecoin;
+
+  @override
+  Future<LitecoinWallet> create(BitcoinNewWalletCredentials credentials) async {
+    final wallet = LitecoinWallet(
+        mnemonic: await generateMnemonic(),
+        password: credentials.password,
+        walletInfo: credentials.walletInfo);
+    await wallet.save();
+    await wallet.init();
+
+    return wallet;
+  }
+
+  @override
+  Future<bool> isWalletExit(String name) async =>
+      File(await pathForWallet(name: name, type: getType())).existsSync();
+
+  @override
+  Future<LitecoinWallet> openWallet(String name, String password) async {
+    final walletInfo = walletInfoSource.values.firstWhere(
+        (info) => info.id == WalletBase.idFor(name, getType()),
+        orElse: () => null);
+    final wallet = await LitecoinWalletBase.open(
+        password: password, name: name, walletInfo: walletInfo);
+    await wallet.init();
+    return wallet;
+  }
+
+  @override
+  Future<void> remove(String wallet) async =>
+      File(await pathForWalletDir(name: wallet, type: getType()))
+          .delete(recursive: true);
+
+  @override
+  Future<LitecoinWallet> restoreFromKeys(
+          BitcoinRestoreWalletFromWIFCredentials credentials) async =>
+      throw UnimplementedError();
+
+  @override
+  Future<LitecoinWallet> restoreFromSeed(
+      BitcoinRestoreWalletFromSeedCredentials credentials) async {
+    if (!validateMnemonic(credentials.mnemonic)) {
+      throw BitcoinMnemonicIsIncorrectException();
+    }
+
+    final wallet = LitecoinWallet(
+        password: credentials.password,
+        mnemonic: credentials.mnemonic,
+        walletInfo: credentials.walletInfo);
+    await wallet.save();
+    await wallet.init();
+    return wallet;
+  }
+}

lib/bitcoin/pending_bitcoin_transaction.dart

@@ -1,18 +1,22 @@
-import 'package:cake_wallet/bitcoin/bitcoin_amount_format.dart';
-import 'package:cake_wallet/bitcoin/bitcoin_transaction_info.dart';
-import 'package:cake_wallet/entities/transaction_direction.dart';
 import 'package:flutter/foundation.dart';
 import 'package:bitcoin_flutter/bitcoin_flutter.dart' as bitcoin;
 import 'package:cake_wallet/core/pending_transaction.dart';
 import 'package:cake_wallet/bitcoin/electrum.dart';
+import 'package:cake_wallet/bitcoin/bitcoin_amount_format.dart';
+import 'package:cake_wallet/bitcoin/electrum_transaction_info.dart';
+import 'package:cake_wallet/entities/transaction_direction.dart';
+import 'package:cake_wallet/entities/wallet_type.dart';
 
 class PendingBitcoinTransaction with PendingTransaction {
-  PendingBitcoinTransaction(this._tx,
+  PendingBitcoinTransaction(this._tx, this.type,
-      {@required this.eclient, @required this.amount, @required this.fee})
+      {@required this.electrumClient,
-      : _listeners = <void Function(BitcoinTransactionInfo transaction)>[];
+      @required this.amount,
+      @required this.fee})
+      : _listeners = <void Function(ElectrumTransactionInfo transaction)>[];
 
+  final WalletType type;
   final bitcoin.Transaction _tx;
-  final ElectrumClient eclient;
+  final ElectrumClient electrumClient;
   final int amount;
   final int fee;
 
@@ -25,24 +29,25 @@ class PendingBitcoinTransaction with PendingTransaction {
   @override
   String get feeFormatted => bitcoinAmountToString(amount: fee);
 
-  final List<void Function(BitcoinTransactionInfo transaction)> _listeners;
+  final List<void Function(ElectrumTransactionInfo transaction)> _listeners;
 
   @override
   Future<void> commit() async {
-    await eclient.broadcastTransaction(transactionRaw: _tx.toHex());
+    await electrumClient.broadcastTransaction(transactionRaw: _tx.toHex());
     _listeners?.forEach((listener) => listener(transactionInfo()));
   }
 
   void addListener(
-          void Function(BitcoinTransactionInfo transaction) listener) =>
+          void Function(ElectrumTransactionInfo transaction) listener) =>
       _listeners.add(listener);
 
-  BitcoinTransactionInfo transactionInfo() => BitcoinTransactionInfo(
+  ElectrumTransactionInfo transactionInfo() => ElectrumTransactionInfo(type,
       id: id,
       height: 0,
       amount: amount,
       direction: TransactionDirection.outgoing,
       date: DateTime.now(),
       isPending: true,
-      confirmations: 0);
+      confirmations: 0,
+      fee: fee);
 }

lib/bitcoin/script_hash.dart

@@ -1,18 +1,20 @@
+import 'package:flutter/foundation.dart';
 import 'package:bitcoin_flutter/bitcoin_flutter.dart' as bitcoin;
 import 'package:crypto/crypto.dart';
 
-String scriptHash(String address) {
+String scriptHash(String address, {@required bitcoin.NetworkType networkType}) {
-  final outputScript = bitcoin.Address.addressToOutputScript(address);
+  final outputScript =
-  final splitted = sha256.convert(outputScript).toString().split('');
+      bitcoin.Address.addressToOutputScript(address, networkType);
+  final parts = sha256.convert(outputScript).toString().split('');
   var res = '';
 
-  for (var i = splitted.length - 1; i >= 0; i--) {
+  for (var i = parts.length - 1; i >= 0; i--) {
-    final char = splitted[i];
+    final char = parts[i];
     i--;
-    final nextChar = splitted[i];
+    final nextChar = parts[i];
     res += nextChar;
     res += char;
   }
 
   return res;
-}
+}

lib/bitcoin/utils.dart

@@ -13,14 +13,43 @@ bitcoin.ECPair generateKeyPair(
         {@required bitcoin.HDWallet hd,
         @required int index,
         bitcoin.NetworkType network}) =>
-    bitcoin.ECPair.fromWIF(hd.derive(index).wif,
+    bitcoin.ECPair.fromWIF(hd.derive(index).wif, network: network);
-        network: network ?? bitcoin.bitcoin);
 
-String generateAddress({@required bitcoin.HDWallet hd, @required int index}) =>
+String generateP2WPKHAddress(
+        {@required bitcoin.HDWallet hd,
+        @required int index,
+        bitcoin.NetworkType networkType}) =>
     bitcoin
         .P2WPKH(
             data: PaymentData(
                 pubkey:
-                    Uint8List.fromList(HEX.decode(hd.derive(index).pubKey))))
+                    Uint8List.fromList(HEX.decode(hd.derive(index).pubKey))),
+            network: networkType)
+        .data
+        .address;
+
+String generateP2WPKHAddressByPath(
+        {@required bitcoin.HDWallet hd,
+        @required String path,
+        bitcoin.NetworkType networkType}) =>
+    bitcoin
+        .P2WPKH(
+            data: PaymentData(
+                pubkey:
+                    Uint8List.fromList(HEX.decode(hd.derivePath(path).pubKey))),
+            network: networkType)
+        .data
+        .address;
+
+String generateP2PKHAddress(
+        {@required bitcoin.HDWallet hd,
+        @required int index,
+        bitcoin.NetworkType networkType}) =>
+    bitcoin
+        .P2PKH(
+            data: PaymentData(
+                pubkey:
+                    Uint8List.fromList(HEX.decode(hd.derive(index).pubKey))),
+            network: networkType)
         .data
         .address;

lib/core/address_validator.dart

@@ -72,7 +72,7 @@ class AddressValidator extends TextValidator {
       case CryptoCurrency.eth:
         return [42];
       case CryptoCurrency.ltc:
-        return [34];
+        return [34, 43];
       case CryptoCurrency.nano:
         return [64, 65];
       case CryptoCurrency.trx:

lib/core/backup_service.dart

@@ -8,7 +8,6 @@ import 'package:path_provider/path_provider.dart';
 import 'package:cryptography/cryptography.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:archive/archive_io.dart';
-import 'package:cake_wallet/core/auth_service.dart';
 import 'package:cake_wallet/core/key_service.dart';
 import 'package:cake_wallet/entities/encrypt.dart';
 import 'package:cake_wallet/entities/preferences_key.dart';

lib/core/fiat_conversion_service.dart

@@ -3,7 +3,6 @@ import 'package:cake_wallet/entities/fiat_currency.dart';
 import 'dart:convert';
 import 'package:flutter/foundation.dart';
 import 'package:http/http.dart';
-import 'package:cake_wallet/entities/currency_formatter.dart';
 
 const fiatApiAuthority = 'fiat-api.cakewallet.com';
 const fiatApiPath = '/v1/rates';
@@ -15,9 +14,8 @@ Future<double> _fetchPrice(Map<String, dynamic> args) async {
 
   try {
     final fiatStringified = fiat.toString();
-    final uri =
+    final uri = Uri.https(fiatApiAuthority, fiatApiPath,
-        Uri.https(fiatApiAuthority, fiatApiPath,
+        <String, String>{'convert': fiatStringified});
-            <String, String> {'convert': fiatStringified});
     final response = await get(uri.toString());
 
     if (response.statusCode != 200) {
@@ -28,7 +26,7 @@ Future<double> _fetchPrice(Map<String, dynamic> args) async {
     final data = responseJSON['data'] as List<dynamic>;
 
     for (final item in data) {
-      if (item['symbol'] == cryptoToString(crypto)) {
+      if (item['symbol'] == crypto.title) {
         price = item['quote'][fiatStringified]['price'] as double;
         break;
       }
@@ -45,6 +43,7 @@ Future<double> _fetchPriceAsync(
     compute(_fetchPrice, {'fiat': fiat, 'crypto': crypto});
 
 class FiatConversionService {
-  static Future<double> fetchPrice(CryptoCurrency crypto, FiatCurrency fiat) async =>
+  static Future<double> fetchPrice(
+          CryptoCurrency crypto, FiatCurrency fiat) async =>
       await _fetchPriceAsync(crypto, fiat);
 }

lib/core/generate_wallet_password.dart

@@ -4,9 +4,9 @@ import 'package:cake_wallet/entities/wallet_type.dart';
 
 String generateWalletPassword(WalletType type) {
   switch (type) {
-    case WalletType.bitcoin:
+    case WalletType.monero:
-      return generateKey();
-    default:
       return Uuid().v4();
+    default:
+      return generateKey();
   }
 }

lib/core/node_port_validator.dart

@@ -1,4 +1,3 @@
-import 'package:flutter/foundation.dart';
 import 'package:cake_wallet/generated/i18n.dart';
 import 'package:cake_wallet/core/validator.dart';
 

lib/core/sec_random_native.dart

@@ -0,0 +1,13 @@
+import 'dart:typed_data';
+
+import 'package:flutter/services.dart';
+
+const utils = const MethodChannel('com.cake_wallet/native_utils');
+
+Future<Uint8List> secRandom(int count) async {
+  try {
+    return await utils.invokeMethod<Uint8List>('sec_random', {'count': count});
+  } on PlatformException catch (_) {
+    return Uint8List.fromList([]);
+  }
+}

lib/core/seed_validator.dart

@@ -24,6 +24,8 @@ class SeedValidator extends Validator<MnemonicItem> {
     switch (type) {
       case WalletType.bitcoin:
         return getBitcoinWordList(language);
+      case WalletType.litecoin:
+        return getBitcoinWordList(language);
       case WalletType.monero:
         return getMoneroWordList(language);
       default:

lib/core/transaction_history.dart

@@ -3,43 +3,50 @@ import 'package:mobx/mobx.dart';
 import 'package:cake_wallet/entities/transaction_info.dart';
 
 abstract class TransactionHistoryBase<TransactionType extends TransactionInfo> {
-  TransactionHistoryBase() : _isUpdating = false;
+  TransactionHistoryBase();
+  // : _isUpdating = false;
 
   @observable
   ObservableMap<String, TransactionType> transactions;
 
-  bool _isUpdating;
+  Future<void> save();
 
-  @action
+  void addOne(TransactionType transaction);
-  Future<void> update() async {
-    if (_isUpdating) {
-      return;
-    }
 
-    try {
+  void addMany(Map<String, TransactionType> transactions);
-      _isUpdating = true;
-      final _transactions = await fetchTransactions();
-      transactions.keys
-          .toSet()
-          .difference(_transactions.keys.toSet())
-          .forEach((k) => transactions.remove(k));
-      _transactions.forEach((key, value) => transactions[key] = value);
-      _isUpdating = false;
-    } catch (e) {
-      _isUpdating = false;
-      rethrow;
-    }
-  }
 
-  void updateAsync({void Function() onFinished}) {
+  // bool _isUpdating;
-    fetchTransactionsAsync(
-        (transaction) => transactions[transaction.id] = transaction,
-        onFinished: onFinished);
-  }
 
-  void fetchTransactionsAsync(
+  // @action
-      void Function(TransactionType transaction) onTransactionLoaded,
+  // Future<void> update() async {
-      {void Function() onFinished});
+  //   if (_isUpdating) {
+  //     return;
+  //   }
 
-  Future<Map<String, TransactionType>> fetchTransactions();
+  //   try {
+  //     _isUpdating = true;
+  //     final _transactions = await fetchTransactions();
+  //     transactions.keys
+  //         .toSet()
+  //         .difference(_transactions.keys.toSet())
+  //         .forEach((k) => transactions.remove(k));
+  //     _transactions.forEach((key, value) => transactions[key] = value);
+  //     _isUpdating = false;
+  //   } catch (e) {
+  //     _isUpdating = false;
+  //     rethrow;
+  //   }
+  // }
+
+  // void updateAsync({void Function() onFinished}) {
+  //   fetchTransactionsAsync(
+  //       (transaction) => transactions[transaction.id] = transaction,
+  //       onFinished: onFinished);
+  // }
+
+  // void fetchTransactionsAsync(
+  //     void Function(TransactionType transaction) onTransactionLoaded,
+  //     {void Function() onFinished});
+
+  // Future<Map<String, TransactionType>> fetchTransactions();
 }

lib/core/wallet_base.dart

@@ -1,4 +1,5 @@
 import 'package:cake_wallet/entities/balance.dart';
+import 'package:cake_wallet/entities/transaction_info.dart';
 import 'package:cake_wallet/entities/transaction_priority.dart';
 import 'package:flutter/foundation.dart';
 import 'package:cake_wallet/entities/wallet_info.dart';
@@ -11,7 +12,10 @@ import 'package:cake_wallet/entities/sync_status.dart';
 import 'package:cake_wallet/entities/node.dart';
 import 'package:cake_wallet/entities/wallet_type.dart';
 
-abstract class WalletBase<BalanceType extends Balance> {
+abstract class WalletBase<
+    BalanceType extends Balance,
+    HistoryType extends TransactionHistoryBase,
+    TransactionType extends TransactionInfo> {
   WalletBase(this.walletInfo);
 
   static String idFor(String name, WalletType type) =>
@@ -41,7 +45,7 @@ abstract class WalletBase<BalanceType extends Balance> {
 
   Object get keys;
 
-  TransactionHistoryBase transactionHistory;
+  HistoryType transactionHistory;
 
   Future<void> connectToNode({@required Node node});
 
@@ -51,6 +55,12 @@ abstract class WalletBase<BalanceType extends Balance> {
 
   int calculateEstimatedFee(TransactionPriority priority, int amount);
 
+  // void fetchTransactionsAsync(
+  //     void Function(TransactionType transaction) onTransactionLoaded,
+  //     {void Function() onFinished});
+
+  Future<Map<String, TransactionType>> fetchTransactions();
+
   Future<void> save();
 
   Future<void> rescan({int height});

lib/core/wallet_service.dart

@@ -1,8 +1,11 @@
 import 'package:cake_wallet/core/wallet_base.dart';
 import 'package:cake_wallet/core/wallet_credentials.dart';
+import 'package:cake_wallet/entities/wallet_type.dart';
 
 abstract class WalletService<N extends WalletCredentials,
     RFS extends WalletCredentials, RFK extends WalletCredentials> {
+  WalletType getType();
+
   Future<WalletBase> create(N credentials);
 
   Future<WalletBase> restoreFromSeed(RFS credentials);

lib/di.dart

@@ -1,4 +1,5 @@
 import 'package:cake_wallet/bitcoin/bitcoin_wallet_service.dart';
+import 'package:cake_wallet/bitcoin/litecoin_wallet_service.dart';
 import 'package:cake_wallet/core/backup_service.dart';
 import 'package:cake_wallet/core/wallet_service.dart';
 import 'package:cake_wallet/entities/biometric_auth.dart';
@@ -441,6 +442,8 @@ Future setup(
 
   getIt.registerFactory(() => BitcoinWalletService(_walletInfoSource));
 
+  getIt.registerFactory(() => LitecoinWalletService(_walletInfoSource));
+
   getIt.registerFactoryParam<WalletService, WalletType, void>(
       (WalletType param1, __) {
     switch (param1) {
@@ -448,6 +451,8 @@ Future setup(
         return getIt.get<MoneroWalletService>();
       case WalletType.bitcoin:
         return getIt.get<BitcoinWalletService>();
+      case WalletType.litecoin:
+        return getIt.get<LitecoinWalletService>();
       default:
         return null;
     }

lib/entities/calculate_fiat_amount.dart

@@ -4,11 +4,12 @@ String calculateFiatAmount({double price, String cryptoAmount}) {
   }
 
   final _amount = double.parse(cryptoAmount);
-  final result = price * _amount;
+  final _result = price * _amount;
+  final result = _result < 0 ? _result * -1 : _result;
 
   if (result == 0.0) {
     return '0.00';
   }
 
   return result > 0.01 ? result.toStringAsFixed(2) : '< 0.01';
-}
+}

lib/entities/crypto_currency.dart

@@ -19,7 +19,6 @@ class CryptoCurrency extends EnumerableItem<int> with Serializable<int> {
     CryptoCurrency.eos,
     CryptoCurrency.eth,
     CryptoCurrency.ltc,
-    CryptoCurrency.nano,
     CryptoCurrency.trx,
     CryptoCurrency.usdt,
     CryptoCurrency.usdterc20,
@@ -29,7 +28,7 @@ class CryptoCurrency extends EnumerableItem<int> with Serializable<int> {
   static const xmr = CryptoCurrency(title: 'XMR', raw: 0);
   static const ada = CryptoCurrency(title: 'ADA', raw: 1);
   static const bch = CryptoCurrency(title: 'BCH', raw: 2);
-  static const bnb = CryptoCurrency(title: 'BNB', raw: 3);
+  static const bnb = CryptoCurrency(title: 'BNB BEP2', raw: 3);
   static const btc = CryptoCurrency(title: 'BTC', raw: 4);
   static const dai = CryptoCurrency(title: 'DAI', raw: 5);
   static const dash = CryptoCurrency(title: 'DASH', raw: 6);
@@ -90,7 +89,7 @@ class CryptoCurrency extends EnumerableItem<int> with Serializable<int> {
         return CryptoCurrency.ada;
       case 'bch':
         return CryptoCurrency.bch;
-      case 'bnb':
+      case 'bnbmainnet':
         return CryptoCurrency.bnb;
       case 'btc':
         return CryptoCurrency.btc;

lib/entities/currency_for_wallet_type.dart

@@ -7,7 +7,9 @@ CryptoCurrency currencyForWalletType(WalletType type) {
       return CryptoCurrency.btc;
     case WalletType.monero:
       return CryptoCurrency.xmr;
+    case WalletType.litecoin:
+      return CryptoCurrency.ltc;
     default:
       return null;
   }
-}
+}

lib/entities/currency_formatter.dart

@@ -1,12 +0,0 @@
-import 'package:cake_wallet/entities/crypto_currency.dart';
-
-String cryptoToString(CryptoCurrency crypto) {
-  switch (crypto) {
-    case CryptoCurrency.xmr:
-      return 'XMR';
-    case CryptoCurrency.btc:
-      return 'BTC';
-    default:
-      return '';
-  }
-}

lib/entities/default_settings_migration.dart

@@ -1,11 +1,7 @@
 import 'dart:io' show File, Platform;
 import 'package:cake_wallet/bitcoin/bitcoin_transaction_priority.dart';
-import 'package:cake_wallet/core/generate_wallet_password.dart';
-import 'package:cake_wallet/core/key_service.dart';
-import 'package:cake_wallet/di.dart';
 import 'package:cake_wallet/entities/pathForWallet.dart';
 import 'package:cake_wallet/entities/secret_store_key.dart';
-import 'package:cake_wallet/monero/monero_wallet_service.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:hive/hive.dart';
@@ -24,7 +20,8 @@ import 'package:cake_wallet/exchange/trade.dart';
 import 'package:encrypt/encrypt.dart' as encrypt;
 
 const newCakeWalletMoneroUri = 'xmr-node.cakewallet.com:18081';
-const cakeWalletElectrumUri = 'electrum.cakewallet.com:50002';
+const cakeWalletBitcoinElectrumUri = 'electrum.cakewallet.com:50002';
+const cakeWalletLitecoinElectrumUri = 'ltc-electrum.cakewallet.com:50002';
 
 Future defaultSettingsMigration(
     {@required int version,
@@ -68,6 +65,8 @@ Future defaultSettingsMigration(
               sharedPreferences: sharedPreferences, nodes: nodes);
           await changeBitcoinCurrentElectrumServerToDefault(
               sharedPreferences: sharedPreferences, nodes: nodes);
+          await changeLitecoinCurrentElectrumServerToDefault(
+              sharedPreferences: sharedPreferences, nodes: nodes);
 
           break;
         case 2:
@@ -97,6 +96,7 @@ Future defaultSettingsMigration(
         case 9:
           await generateBackupPassword(secureStorage);
           break;
+
         case 10:
           await changeTransactionPriorityAndFeeRateKeys(sharedPreferences);
           break;
@@ -110,7 +110,14 @@ Future defaultSettingsMigration(
           break;
 
         case 13:
-          await resetElectrumServer(nodes, sharedPreferences);
+          await resetBitcoinElectrumServer(nodes, sharedPreferences);
+          break;
+
+        case 15:
+          await addLitecoinElectrumServerList(nodes: nodes);
+          await changeLitecoinCurrentElectrumServerToDefault(
+              sharedPreferences: sharedPreferences, nodes: nodes);
+          await checkCurrentNodes(nodes, sharedPreferences);
           break;
 
         default:
@@ -142,7 +149,7 @@ Future<void> replaceNodesMigration({@required Box<Node> nodes}) async {
     final nodeToReplace = replaceNodes[node.uri];
 
     if (nodeToReplace != null) {
-      node.uri = nodeToReplace.uri;
+      node.uriRaw = nodeToReplace.uriRaw;
       node.login = nodeToReplace.login;
       node.password = nodeToReplace.password;
       await node.save();
@@ -160,12 +167,21 @@ Future<void> changeMoneroCurrentNodeToDefault(
 }
 
 Node getBitcoinDefaultElectrumServer({@required Box<Node> nodes}) {
-  return nodes.values
+  return nodes.values.firstWhere(
-          .firstWhere((Node node) => node.uri == cakeWalletElectrumUri, orElse: () => null) ??
+          (Node node) => node.uri == cakeWalletBitcoinElectrumUri,
+          orElse: () => null) ??
       nodes.values.firstWhere((node) => node.type == WalletType.bitcoin,
           orElse: () => null);
 }
 
+Node getLitecoinDefaultElectrumServer({@required Box<Node> nodes}) {
+  return nodes.values.firstWhere(
+          (Node node) => node.uri == cakeWalletLitecoinElectrumUri,
+          orElse: () => null) ??
+      nodes.values.firstWhere((node) => node.type == WalletType.litecoin,
+          orElse: () => null);
+}
+
 Node getMoneroDefaultNode({@required Box<Node> nodes}) {
   final timeZone = DateTime.now().timeZoneOffset.inHours;
   var nodeUri = '';
@@ -192,6 +208,15 @@ Future<void> changeBitcoinCurrentElectrumServerToDefault(
   await sharedPreferences.setInt('current_node_id_btc', serverId);
 }
 
+Future<void> changeLitecoinCurrentElectrumServerToDefault(
+    {@required SharedPreferences sharedPreferences,
+    @required Box<Node> nodes}) async {
+  final server = getLitecoinDefaultElectrumServer(nodes: nodes);
+  final serverId = server?.key as int ?? 0;
+
+  await sharedPreferences.setInt('current_node_id_ltc', serverId);
+}
+
 Future<void> replaceDefaultNode(
     {@required SharedPreferences sharedPreferences,
     @required Box<Node> nodes}) async {
@@ -224,7 +249,12 @@ Future<void> updateNodeTypes({@required Box<Node> nodes}) async {
 }
 
 Future<void> addBitcoinElectrumServerList({@required Box<Node> nodes}) async {
-  final serverList = await loadElectrumServerList();
+  final serverList = await loadBitcoinElectrumServerList();
+  await nodes.addAll(serverList);
+}
+
+Future<void> addLitecoinElectrumServerList({@required Box<Node> nodes}) async {
+  final serverList = await loadLitecoinElectrumServerList();
   await nodes.addAll(serverList);
 }
 
@@ -284,57 +314,97 @@ Future<void> changeTransactionPriorityAndFeeRateKeys(
 Future<void> changeDefaultMoneroNode(
     Box<Node> nodeSource, SharedPreferences sharedPreferences) async {
   const cakeWalletMoneroNodeUriPattern = '.cakewallet.com';
-  final currentMoneroNodeId = sharedPreferences.getInt(PreferencesKey.currentNodeIdKey);
+  final currentMoneroNodeId =
-  final currentMoneroNode = nodeSource.values.firstWhere((node) => node.key == currentMoneroNodeId);
+      sharedPreferences.getInt(PreferencesKey.currentNodeIdKey);
-  final needToReplaceCurrentMoneroNode = currentMoneroNode.uri.contains(cakeWalletMoneroNodeUriPattern);
+  final currentMoneroNode =
+      nodeSource.values.firstWhere((node) => node.key == currentMoneroNodeId);
+  final needToReplaceCurrentMoneroNode =
+      currentMoneroNode.uri.toString().contains(cakeWalletMoneroNodeUriPattern);
 
   nodeSource.values.forEach((node) async {
-    if (node.type == WalletType.monero && node.uri.contains(cakeWalletMoneroNodeUriPattern)) {
+    if (node.type == WalletType.monero &&
+        node.uri.toString().contains(cakeWalletMoneroNodeUriPattern)) {
       await node.delete();
     }
   });
 
-  final newCakeWalletNode = Node(uri: newCakeWalletMoneroUri, type: WalletType.monero);
+  final newCakeWalletNode =
+      Node(uri: newCakeWalletMoneroUri, type: WalletType.monero);
 
   await nodeSource.add(newCakeWalletNode);
 
   if (needToReplaceCurrentMoneroNode) {
-    await sharedPreferences.setInt(PreferencesKey.currentNodeIdKey, newCakeWalletNode.key as int);
+    await sharedPreferences.setInt(
+        PreferencesKey.currentNodeIdKey, newCakeWalletNode.key as int);
   }
 }
 
-Future<void> checkCurrentNodes(Box<Node> nodeSource, SharedPreferences sharedPreferences) async {
+Future<void> checkCurrentNodes(
-  final currentMoneroNodeId = sharedPreferences.getInt(PreferencesKey.currentNodeIdKey);
+    Box<Node> nodeSource, SharedPreferences sharedPreferences) async {
-  final currentElectrumSeverId = await sharedPreferences.getInt(PreferencesKey.currentBitcoinElectrumSererIdKey);
+  final currentMoneroNodeId =
-  final currentMoneroNode = nodeSource.values.firstWhere((node) => node.key == currentMoneroNodeId, orElse: () => null);
+      sharedPreferences.getInt(PreferencesKey.currentNodeIdKey);
-  final currentElectrumServer = nodeSource.values.firstWhere((node) => node.key == currentElectrumSeverId, orElse: () => null);
+  final currentBitcoinElectrumSeverId =
+      sharedPreferences.getInt(PreferencesKey.currentBitcoinElectrumSererIdKey);
+  final currentLitecoinElectrumSeverId = sharedPreferences
+      .getInt(PreferencesKey.currentLitecoinElectrumSererIdKey);
+  final currentMoneroNode = nodeSource.values.firstWhere(
+      (node) => node.key == currentMoneroNodeId,
+      orElse: () => null);
+  final currentBitcoinElectrumServer = nodeSource.values.firstWhere(
+      (node) => node.key == currentBitcoinElectrumSeverId,
+      orElse: () => null);
+  final currentLitecoinElectrumServer = nodeSource.values.firstWhere(
+      (node) => node.key == currentLitecoinElectrumSeverId,
+      orElse: () => null);
 
   if (currentMoneroNode == null) {
-    final newCakeWalletNode = Node(uri: newCakeWalletMoneroUri, type: WalletType.monero);
+    final newCakeWalletNode =
+        Node(uri: newCakeWalletMoneroUri, type: WalletType.monero);
     await nodeSource.add(newCakeWalletNode);
-    await sharedPreferences.setInt(PreferencesKey.currentNodeIdKey, newCakeWalletNode.key as int);
+    await sharedPreferences.setInt(
+        PreferencesKey.currentNodeIdKey, newCakeWalletNode.key as int);
   }
 
-  if (currentElectrumServer == null) {
+  if (currentBitcoinElectrumServer == null) {
-    final cakeWalletElectrum = Node(uri: cakeWalletElectrumUri, type: WalletType.bitcoin);
+    final cakeWalletElectrum =
+        Node(uri: cakeWalletBitcoinElectrumUri, type: WalletType.bitcoin);
     await nodeSource.add(cakeWalletElectrum);
-    await sharedPreferences.setInt(PreferencesKey.currentBitcoinElectrumSererIdKey, cakeWalletElectrum.key as int);
+    await sharedPreferences.setInt(
+        PreferencesKey.currentBitcoinElectrumSererIdKey,
+        cakeWalletElectrum.key as int);
+  }
+
+  if (currentLitecoinElectrumServer == null) {
+    final cakeWalletElectrum =
+        Node(uri: cakeWalletLitecoinElectrumUri, type: WalletType.litecoin);
+    await nodeSource.add(cakeWalletElectrum);
+    await sharedPreferences.setInt(
+        PreferencesKey.currentLitecoinElectrumSererIdKey,
+        cakeWalletElectrum.key as int);
   }
 }
 
-
+Future<void> resetBitcoinElectrumServer(
-Future<void> resetElectrumServer(Box<Node> nodeSource, SharedPreferences sharedPreferences) async {
+    Box<Node> nodeSource, SharedPreferences sharedPreferences) async {
-  final currentElectrumSeverId = sharedPreferences.getInt(PreferencesKey.currentBitcoinElectrumSererIdKey);
+  final currentElectrumSeverId =
-  final oldElectrumServer = nodeSource.values.firstWhere((node) => node.uri.contains('electrumx.cakewallet.com'), orElse: () => null);
+      sharedPreferences.getInt(PreferencesKey.currentBitcoinElectrumSererIdKey);
-  var cakeWalletNode = nodeSource.values.firstWhere((node) => node.uri == cakeWalletElectrumUri, orElse: () => null);
+  final oldElectrumServer = nodeSource.values.firstWhere(
+      (node) => node.uri.toString().contains('electrumx.cakewallet.com'),
+      orElse: () => null);
+  var cakeWalletNode = nodeSource.values.firstWhere(
+      (node) => node.uri.toString() == cakeWalletBitcoinElectrumUri,
+      orElse: () => null);
 
   if (cakeWalletNode == null) {
-    cakeWalletNode = Node(uri: cakeWalletElectrumUri, type: WalletType.bitcoin);
+    cakeWalletNode =
+        Node(uri: cakeWalletBitcoinElectrumUri, type: WalletType.bitcoin);
     await nodeSource.add(cakeWalletNode);
   }
 
   if (currentElectrumSeverId == oldElectrumServer?.key) {
-    await sharedPreferences.setInt(PreferencesKey.currentBitcoinElectrumSererIdKey, cakeWalletNode.key as int);
+    await sharedPreferences.setInt(
+        PreferencesKey.currentBitcoinElectrumSererIdKey,
+        cakeWalletNode.key as int);
   }
 
   await oldElectrumServer?.delete();

lib/entities/fs_migration.dart

@@ -1,7 +1,10 @@
 import 'dart:io';
 import 'dart:convert';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:hive/hive.dart';
+import 'package:path_provider/path_provider.dart';
 import 'package:cake_wallet/core/key_service.dart';
-import 'package:cake_wallet/di.dart';
 import 'package:cake_wallet/entities/contact.dart';
 import 'package:cake_wallet/entities/crypto_currency.dart';
 import 'package:cake_wallet/entities/encrypt.dart';
@@ -14,11 +17,6 @@ import 'package:cake_wallet/entities/wallet_info.dart';
 import 'package:cake_wallet/entities/wallet_type.dart';
 import 'package:cake_wallet/exchange/exchange_provider_description.dart';
 import 'package:cake_wallet/exchange/trade.dart';
-import 'package:flutter_secure_storage/flutter_secure_storage.dart';
-import 'package:shared_preferences/shared_preferences.dart';
-import 'package:flutter/foundation.dart';
-import 'package:hive/hive.dart';
-import 'package:path_provider/path_provider.dart';
 import 'package:cake_wallet/.secrets.g.dart' as secrets;
 
 const reservedNames = ["flutter_assets", "wallets", "db"];
@@ -407,7 +405,7 @@ Future<void> ios_migrate_address_book(Box<Contact> contactSource) async {
     }
 
     final List<dynamic> addresses =
-    json.decode(addressBookJSON.readAsStringSync()) as List<dynamic>;
+        json.decode(addressBookJSON.readAsStringSync()) as List<dynamic>;
     final contacts = addresses.map((dynamic item) {
       final _item = item as Map<String, dynamic>;
       final type = _item["type"] as String;
@@ -420,7 +418,7 @@ Future<void> ios_migrate_address_book(Box<Contact> contactSource) async {
 
     await contactSource.addAll(contacts);
     await prefs.setBool('ios_migration_address_book_completed', true);
-  } catch(e) {
+  } catch (e) {
     print(e.toString());
   }
 }

lib/entities/language_service.dart

@@ -15,7 +15,9 @@ class LanguageService {
     'pt': 'Português (Portuguese)',
     'ru': 'Русский (Russian)',
     'uk': 'Українська (Ukrainian)',
-    'zh': '中文 (Chinese)'
+    'zh': '中文 (Chinese)',
+    'hr': 'Hrvatski (Croatian)',
+    'it': 'Italiano (Italian)'
   };
   static final list = <String, String> {};
 

lib/entities/node.dart

@@ -1,3 +1,5 @@
+import 'dart:io';
+
 import 'package:cake_wallet/utils/mobx.dart';
 import 'package:flutter/foundation.dart';
 import 'dart:convert';
@@ -8,19 +10,23 @@ import 'package:cake_wallet/entities/digest_request.dart';
 
 part 'node.g.dart';
 
+Uri createUriFromElectrumAddress(String address) =>
+    Uri.tryParse('tcp://$address');
+
 @HiveType(typeId: Node.typeId)
 class Node extends HiveObject with Keyable {
   Node(
-      {@required this.uri,
+      {@required String uri,
       @required WalletType type,
       this.login,
       this.password,
       this.useSSL}) {
+    uriRaw = uri;
     this.type = type;
   }
 
   Node.fromMap(Map map)
-      : uri = map['uri'] as String ?? '',
+      : uriRaw = map['uri'] as String ?? '',
         login = map['login'] as String,
         password = map['password'] as String,
         typeRaw = map['typeRaw'] as int,
@@ -30,7 +36,7 @@ class Node extends HiveObject with Keyable {
   static const boxName = 'Nodes';
 
   @HiveField(0)
-  String uri;
+  String uriRaw;
 
   @HiveField(1)
   String login;
@@ -46,6 +52,19 @@ class Node extends HiveObject with Keyable {
 
   bool get isSSL => useSSL ?? false;
 
+  Uri get uri {
+    switch (type) {
+      case WalletType.monero:
+        return Uri.http(uriRaw, '');
+      case WalletType.bitcoin:
+        return createUriFromElectrumAddress(uriRaw);
+      case WalletType.litecoin:
+        return createUriFromElectrumAddress(uriRaw);
+      default:
+        return null;
+    }
+  }
+
   @override
   dynamic get keyIndex {
     _keyIndex ??= key;
@@ -64,7 +83,9 @@ class Node extends HiveObject with Keyable {
         case WalletType.monero:
           return requestMoneroNode();
         case WalletType.bitcoin:
-          return requestBitcoinElectrumServer();
+          return requestElectrumServer();
+        case WalletType.litecoin:
+          return requestElectrumServer();
         default:
           return false;
       }
@@ -80,15 +101,15 @@ class Node extends HiveObject with Keyable {
       if (login != null && password != null) {
         final digestRequest = DigestRequest();
         final response = await digestRequest.request(
-            uri: uri, login: login, password: password);
+            uri: uri.toString(), login: login, password: password);
         resBody = response.data as Map<String, dynamic>;
       } else {
-        final url = Uri.http(uri, '/json_rpc');
+        final rpcUri = Uri.http(uri.authority, '/json_rpc');
         final headers = {'Content-type': 'application/json'};
         final body =
             json.encode({'jsonrpc': '2.0', 'id': '0', 'method': 'get_info'});
         final response =
-            await http.post(url.toString(), headers: headers, body: body);
+            await http.post(rpcUri.toString(), headers: headers, body: body);
         resBody = json.decode(response.body) as Map<String, dynamic>;
       }
 
@@ -98,8 +119,13 @@ class Node extends HiveObject with Keyable {
     }
   }
 
-  Future<bool> requestBitcoinElectrumServer() async {
+  Future<bool> requestElectrumServer() async {
-    // FIXME: IMPLEMENT ME
+    try {
-    return true;
+      await SecureSocket.connect(uri.host, uri.port,
+          timeout: Duration(seconds: 5), onBadCertificate: (_) => true);
+      return true;
+    } catch (_) {
+      return false;
+    }
   }
 }

lib/entities/node_list.dart

@@ -20,9 +20,9 @@ Future<List<Node>> loadDefaultNodes() async {
   }).toList();
 }
 
-Future<List<Node>> loadElectrumServerList() async {
+Future<List<Node>> loadBitcoinElectrumServerList() async {
   final serverListRaw =
-      await rootBundle.loadString('assets/electrum_server_list.yml');
+      await rootBundle.loadString('assets/bitcoin_electrum_server_list.yml');
   final serverList = loadYaml(serverListRaw) as YamlList;
 
   return serverList.map((dynamic raw) {
@@ -37,10 +37,29 @@ Future<List<Node>> loadElectrumServerList() async {
   }).toList();
 }
 
+Future<List<Node>> loadLitecoinElectrumServerList() async {
+  final serverListRaw =
+      await rootBundle.loadString('assets/litecoin_electrum_server_list.yml');
+  final serverList = loadYaml(serverListRaw) as YamlList;
+
+  return serverList.map((dynamic raw) {
+    if (raw is Map) {
+      final node = Node.fromMap(raw);
+      node?.type = WalletType.litecoin;
+
+      return node;
+    }
+
+    return null;
+  }).toList();
+}
+
 Future resetToDefault(Box<Node> nodeSource) async {
   final moneroNodes = await loadDefaultNodes();
-  final bitcoinElectrumServerList = await loadElectrumServerList();
+  final bitcoinElectrumServerList = await loadBitcoinElectrumServerList();
-  final nodes = moneroNodes + bitcoinElectrumServerList;
+  final litecoinElectrumServerList = await loadLitecoinElectrumServerList();
+  final nodes =
+      moneroNodes + bitcoinElectrumServerList + litecoinElectrumServerList;
 
   await nodeSource.clear();
   await nodeSource.addAll(nodes);

lib/entities/preferences_key.dart

@@ -1,8 +1,9 @@
 class PreferencesKey {
-  static const currentWalletType ='current_wallet_type';
+  static const currentWalletType = 'current_wallet_type';
-  static const currentWalletName ='current_wallet_name';
+  static const currentWalletName = 'current_wallet_name';
   static const currentNodeIdKey = 'current_node_id';
   static const currentBitcoinElectrumSererIdKey = 'current_node_id_btc';
+  static const currentLitecoinElectrumSererIdKey = 'current_node_id_ltc';
   static const currentFiatCurrencyKey = 'current_fiat_currency';
   static const currentTransactionPriorityKeyLegacy = 'current_fee_priority';
   static const currentBalanceDisplayModeKey = 'current_balance_display_mode';
@@ -14,7 +15,8 @@ class PreferencesKey {
   static const displayActionListModeKey = 'display_list_mode';
   static const currentPinLength = 'current_pin_length';
   static const currentLanguageCode = 'language_code';
-  static const currentDefaultSettingsMigrationVersion = 'current_default_settings_migration_version';
+  static const currentDefaultSettingsMigrationVersion =
+      'current_default_settings_migration_version';
   static const moneroTransactionPriority = 'current_fee_priority_monero';
   static const bitcoinTransactionPriority = 'current_fee_priority_bitcoin';
-}
+}

lib/entities/wallet_type.dart

@@ -3,7 +3,11 @@ import 'package:hive/hive.dart';
 
 part 'wallet_type.g.dart';
 
-const walletTypes = [WalletType.monero, WalletType.bitcoin];
+const walletTypes = [
+  WalletType.monero,
+  WalletType.bitcoin,
+  WalletType.litecoin
+];
 const walletTypeTypeId = 5;
 
 @HiveType(typeId: walletTypeTypeId)
@@ -15,7 +19,10 @@ enum WalletType {
   none,
 
   @HiveField(2)
-  bitcoin
+  bitcoin,
+
+  @HiveField(3)
+  litecoin
 }
 
 int serializeToInt(WalletType type) {
@@ -24,6 +31,8 @@ int serializeToInt(WalletType type) {
       return 0;
     case WalletType.bitcoin:
       return 1;
+    case WalletType.litecoin:
+      return 2;
     default:
       return -1;
   }
@@ -35,6 +44,8 @@ WalletType deserializeFromInt(int raw) {
       return WalletType.monero;
     case 1:
       return WalletType.bitcoin;
+    case 2:
+      return WalletType.litecoin;
     default:
       return null;
   }
@@ -46,6 +57,8 @@ String walletTypeToString(WalletType type) {
       return 'Monero';
     case WalletType.bitcoin:
       return 'Bitcoin';
+    case WalletType.litecoin:
+      return 'Litecoin';
     default:
       return '';
   }
@@ -57,6 +70,8 @@ String walletTypeToDisplayName(WalletType type) {
       return 'Monero';
     case WalletType.bitcoin:
       return 'Bitcoin (Electrum)';
+    case WalletType.litecoin:
+      return 'Litecoin';
     default:
       return '';
   }
@@ -68,6 +83,8 @@ CryptoCurrency walletTypeToCryptoCurrency(WalletType type) {
       return CryptoCurrency.xmr;
     case WalletType.bitcoin:
       return CryptoCurrency.btc;
+    case WalletType.litecoin:
+      return CryptoCurrency.ltc;
     default:
       return null;
   }

lib/exchange/changenow/changenow_exchange_provider.dart

@@ -48,7 +48,9 @@ class ChangeNowExchangeProvider extends ExchangeProvider {
   @override
   Future<Limits> fetchLimits({CryptoCurrency from, CryptoCurrency to,
     bool isFixedRateMode}) async {
-    final symbol = from.toString() + '_' + to.toString();
+    final fromTitle = defineCurrencyTitle(from);
+    final toTitle = defineCurrencyTitle(to);
+    final symbol = fromTitle + '_' + toTitle;
     final url = isFixedRateMode
         ? apiUri + _marketInfoUriSufix + _fixedRateUriSufix + apiKey
         : apiUri + _minAmountUriSufix + symbol;
@@ -61,8 +63,7 @@ class ChangeNowExchangeProvider extends ExchangeProvider {
         final elemFrom = elem["from"] as String;
         final elemTo = elem["to"] as String;
 
-        if ((elemFrom == from.toString().toLowerCase()) &&
+        if ((elemFrom == fromTitle) && (elemTo == toTitle)) {
-            (elemTo == to.toString().toLowerCase())) {
           final min = elem["min"] as double;
           final max = elem["max"] as double;
 
@@ -84,9 +85,11 @@ class ChangeNowExchangeProvider extends ExchangeProvider {
     ? apiUri + _transactionsUriSufix + _fixedRateUriSufix + apiKey
     : apiUri + _transactionsUriSufix + apiKey;
     final _request = request as ChangeNowRequest;
+    final fromTitle = defineCurrencyTitle(_request.from);
+    final toTitle = defineCurrencyTitle(_request.to);
     final body = {
-      'from': _request.from.toString(),
+      'from': fromTitle,
-      'to': _request.to.toString(),
+      'to': toTitle,
       'address': _request.address,
       'amount': _request.amount,
       'refundAddress': _request.refundAddress
@@ -182,6 +185,8 @@ class ChangeNowExchangeProvider extends ExchangeProvider {
       final url = apiUri + _marketInfoUriSufix + _fixedRateUriSufix + apiKey;
       final response = await get(url);
       final responseJSON = json.decode(response.body) as List<dynamic>;
+      final fromTitle = defineCurrencyTitle(from);
+      final toTitle = defineCurrencyTitle(to);
       var rate = 0.0;
       var fee = 0.0;
 
@@ -189,8 +194,7 @@ class ChangeNowExchangeProvider extends ExchangeProvider {
         final elemFrom = elem["from"] as String;
         final elemTo = elem["to"] as String;
 
-        if ((elemFrom == to.toString().toLowerCase()) &&
+        if ((elemFrom == toTitle) && (elemTo == fromTitle)) {
-            (elemTo == from.toString().toLowerCase())) {
           rate = elem["rate"] as double;
           fee = elem["minerFee"] as double;
           break;
@@ -216,22 +220,32 @@ class ChangeNowExchangeProvider extends ExchangeProvider {
       CryptoCurrency to,
       double amount,
       bool isFixedRateMode) {
+    final fromTitle = defineCurrencyTitle(from);
+    final toTitle = defineCurrencyTitle(to);
+
     return isFixedRateMode
         ? apiUri +
         _exchangeAmountUriSufix +
         _fixedRateUriSufix +
         amount.toString() +
         '/' +
-        from.toString() +
+        fromTitle +
         '_' +
-        to.toString() +
+        toTitle +
         '?api_key=' + apiKey
         : apiUri +
         _exchangeAmountUriSufix +
         amount.toString() +
         '/' +
-        from.toString() +
+        fromTitle +
         '_' +
-        to.toString();
+        toTitle;
+  }
+
+  static String defineCurrencyTitle(CryptoCurrency currency) {
+    const bnbTitle = 'bnbmainnet';
+    final currencyTitle = currency == CryptoCurrency.bnb
+        ? bnbTitle : currency.title.toLowerCase();
+    return currencyTitle;
   }
 }

lib/main.dart

@@ -107,7 +107,7 @@ Future<void> main() async {
         exchangeTemplates: exchangeTemplates,
         transactionDescriptions: transactionDescriptions,
         secureStorage: secureStorage,
-        initialMigrationVersion: 13);
+        initialMigrationVersion: 15);
     runApp(App());
   } catch (e) {
     runApp(MaterialApp(
@@ -135,7 +135,7 @@ Future<void> initialSetup(
     @required Box<ExchangeTemplate> exchangeTemplates,
     @required Box<TransactionDescription> transactionDescriptions,
     FlutterSecureStorage secureStorage,
-    int initialMigrationVersion = 13}) async {
+    int initialMigrationVersion = 15}) async {
   LanguageService.loadLocaleList();
   await defaultSettingsMigration(
       secureStorage: secureStorage,

lib/monero/monero_account_list.dart

@@ -49,13 +49,13 @@ abstract class MoneroAccountListBase with Store {
 
   Future addAccount({String label}) async {
     await account_list.addAccount(label: label);
-    await update();
+    update();
   }
 
   Future setLabelAccount({int accountIndex, String label}) async {
     await account_list.setLabelForAccount(
         accountIndex: accountIndex, label: label);
-    await update();
+    update();
   }
 
   void refresh() {

lib/monero/monero_transaction_history.dart

@@ -1,18 +1,10 @@
 import 'dart:core';
 import 'package:mobx/mobx.dart';
-import 'package:cw_monero/transaction_history.dart'
-    as monero_transaction_history;
 import 'package:cake_wallet/core/transaction_history.dart';
 import 'package:cake_wallet/monero/monero_transaction_info.dart';
 
 part 'monero_transaction_history.g.dart';
 
-List<MoneroTransactionInfo> _getAllTransactions(dynamic _) =>
-    monero_transaction_history
-        .getAllTransations()
-        .map((row) => MoneroTransactionInfo.fromRow(row))
-        .toList();
-
 class MoneroTransactionHistory = MoneroTransactionHistoryBase
     with _$MoneroTransactionHistory;
 
@@ -23,30 +15,13 @@ abstract class MoneroTransactionHistoryBase
   }
 
   @override
-  Future<Map<String, MoneroTransactionInfo>> fetchTransactions() async {
+  Future<void> save() async {}
-    monero_transaction_history.refreshTransactions();
-    return _getAllTransactions(null).fold<Map<String, MoneroTransactionInfo>>(
-        <String, MoneroTransactionInfo>{},
-        (Map<String, MoneroTransactionInfo> acc, MoneroTransactionInfo tx) {
-      acc[tx.id] = tx;
-      return acc;
-    });
-  }
 
   @override
-  @action
+  void addOne(MoneroTransactionInfo transaction) =>
-  void updateAsync({void Function() onFinished}) {
+      transactions[transaction.id] = transaction;
-    fetchTransactionsAsync(
-        (transaction) => transactions[transaction.id] = transaction,
-        onFinished: onFinished);
-  }
 
   @override
-  void fetchTransactionsAsync(
+  void addMany(Map<String, MoneroTransactionInfo> transactions) =>
-      void Function(MoneroTransactionInfo transaction) onTransactionLoaded,
+      this.transactions.addAll(transactions);
-      {void Function() onFinished}) async {
-    final transactions = await fetchTransactions();
-    transactions.values.forEach((tx) => onTransactionLoaded(tx));
-    onFinished?.call();
-  }
 }

lib/monero/monero_transaction_info.dart

@@ -59,6 +59,7 @@ class MoneroTransactionInfo extends TransactionInfo {
   @override
   void changeFiatAmount(String amount) => _fiatAmount = formatAmount(amount);
 
+  @override
   String feeFormatted() =>
       '${formatAmount(moneroAmountToString(amount: fee))} XMR';
 }

lib/monero/monero_wallet.dart

@@ -1,10 +1,12 @@
 import 'dart:async';
-
 import 'package:cake_wallet/entities/transaction_priority.dart';
 import 'package:cake_wallet/monero/monero_amount_format.dart';
 import 'package:cake_wallet/monero/monero_transaction_creation_exception.dart';
+import 'package:cake_wallet/monero/monero_transaction_info.dart';
 import 'package:flutter/foundation.dart';
 import 'package:mobx/mobx.dart';
+import 'package:cw_monero/transaction_history.dart'
+    as monero_transaction_history;
 import 'package:cw_monero/wallet.dart';
 import 'package:cw_monero/wallet.dart' as monero_wallet;
 import 'package:cw_monero/transaction_history.dart' as transaction_history;
@@ -30,19 +32,21 @@ const moneroBlockSize = 1000;
 
 class MoneroWallet = MoneroWalletBase with _$MoneroWallet;
 
-abstract class MoneroWalletBase extends WalletBase<MoneroBalance> with Store {
+abstract class MoneroWalletBase extends WalletBase<MoneroBalance,
-  MoneroWalletBase({String filename, WalletInfo walletInfo})
+    MoneroTransactionHistory, MoneroTransactionInfo> with Store {
-      : transactionHistory = MoneroTransactionHistory(),
+  MoneroWalletBase({WalletInfo walletInfo})
-        accountList = MoneroAccountList(),
+      : accountList = MoneroAccountList(),
         subaddressList = MoneroSubaddressList(),
         super(walletInfo) {
-    _filename = filename;
+    transactionHistory = MoneroTransactionHistory();
     balance = MoneroBalance(
         fullBalance: monero_wallet.getFullBalance(accountIndex: 0),
         unlockedBalance: monero_wallet.getFullBalance(accountIndex: 0));
     _lastAutosaveTimestamp = 0;
+    _lastSaveTimestamp = 0;
     _isSavingAfterSync = false;
     _isSavingAfterNewTransaction = false;
+    _isTransactionUpdating = false;
     _onAccountChangeReaction = reaction((_) => account, (Account account) {
       balance = MoneroBalance(
           fullBalance: monero_wallet.getFullBalance(accountIndex: account.id),
@@ -56,9 +60,6 @@ abstract class MoneroWalletBase extends WalletBase<MoneroBalance> with Store {
 
   static const int _autoAfterSyncSaveInterval = 60000;
 
-  @override
-  final MoneroTransactionHistory transactionHistory;
-
   @observable
   Account account;
 
@@ -91,19 +92,18 @@ abstract class MoneroWalletBase extends WalletBase<MoneroBalance> with Store {
 
   final MoneroAccountList accountList;
 
-  String _filename;
   SyncListener _listener;
   ReactionDisposer _onAccountChangeReaction;
   int _lastAutosaveTimestamp;
   bool _isSavingAfterSync;
   bool _isSavingAfterNewTransaction;
+  bool _isTransactionUpdating;
+  int _lastSaveTimestamp;
 
   Future<void> init() async {
     accountList.update();
-    accountList.accounts.observe((_) async => await save());
     account = accountList.accounts.first;
     subaddressList.update(accountIndex: account.id ?? 0);
-    subaddressList.subaddresses.observe((_) async => await save());
     subaddress = subaddressList.getAll().first;
     balance = MoneroBalance(
         fullBalance: monero_wallet.getFullBalance(accountIndex: account.id),
@@ -111,7 +111,7 @@ abstract class MoneroWalletBase extends WalletBase<MoneroBalance> with Store {
             monero_wallet.getUnlockedBalance(accountIndex: account.id));
     address = subaddress.address;
     _setListeners();
-    await transactionHistory.update();
+    await updateTransactions();
 
     if (walletInfo.isRecovery) {
       monero_wallet.setRecoveringFromSeed(isRecovery: walletInfo.isRecovery);
@@ -152,7 +152,7 @@ abstract class MoneroWalletBase extends WalletBase<MoneroBalance> with Store {
     try {
       syncStatus = ConnectingSyncStatus();
       await monero_wallet.setupNode(
-          address: node.uri,
+          address: node.uri.toString(),
           login: node.login,
           password: node.password,
           useSSL: node.isSSL,
@@ -238,6 +238,13 @@ abstract class MoneroWalletBase extends WalletBase<MoneroBalance> with Store {
 
   @override
   Future<void> save() async {
+    final now = DateTime.now().millisecondsSinceEpoch;
+
+    if (now - _lastSaveTimestamp < Duration(seconds: 10).inMilliseconds) {
+      return;
+    }
+
+    _lastSaveTimestamp = now;
     await monero_wallet.store();
   }
 
@@ -264,6 +271,40 @@ abstract class MoneroWalletBase extends WalletBase<MoneroBalance> with Store {
     await walletInfo.save();
   }
 
+  @override
+  Future<Map<String, MoneroTransactionInfo>> fetchTransactions() async {
+    monero_transaction_history.refreshTransactions();
+    return _getAllTransactions(null).fold<Map<String, MoneroTransactionInfo>>(
+        <String, MoneroTransactionInfo>{},
+        (Map<String, MoneroTransactionInfo> acc, MoneroTransactionInfo tx) {
+      acc[tx.id] = tx;
+      return acc;
+    });
+  }
+
+  Future<void> updateTransactions() async {
+    try {
+      if (_isTransactionUpdating) {
+        return;
+      }
+
+      _isTransactionUpdating = true;
+      final transactions = await fetchTransactions();
+      transactionHistory.addMany(transactions);
+      await transactionHistory.save();
+      _isTransactionUpdating = false;
+    } catch (e) {
+      print(e);
+      _isTransactionUpdating = false;
+    }
+  }
+
+  List<MoneroTransactionInfo> _getAllTransactions(dynamic _) =>
+      monero_transaction_history
+          .getAllTransations()
+          .map((row) => MoneroTransactionInfo.fromRow(row))
+          .toList();
+
   void _setListeners() {
     _listener?.stop();
     _listener = monero_wallet.setListeners(_onNewBlock, _onNewTransaction);
@@ -315,7 +356,7 @@ abstract class MoneroWalletBase extends WalletBase<MoneroBalance> with Store {
   }
 
   Future<void> _askForUpdateTransactionHistory() async =>
-      await transactionHistory.update();
+      await updateTransactions();
 
   int _getFullBalance() =>
       monero_wallet.getFullBalance(accountIndex: account.id);
@@ -389,11 +430,12 @@ abstract class MoneroWalletBase extends WalletBase<MoneroBalance> with Store {
     }
   }
 
-  void _onNewTransaction() {
+  void _onNewTransaction() async {
     try {
-      _askForUpdateTransactionHistory();
+      await _askForUpdateTransactionHistory();
       _askForUpdateBalance();
-      Timer(Duration(seconds: 1), () => _afterNewTransactionSave());
+      await Future<void>.delayed(Duration(seconds: 1));
+      await _afterNewTransactionSave();
     } catch (e) {
       print(e.toString());
     }

lib/monero/monero_wallet_service.dart

@@ -68,18 +68,18 @@ class MoneroWalletService extends WalletService<
   static bool walletFilesExist(String path) =>
       !File(path).existsSync() && !File('$path.keys').existsSync();
 
+  @override
+  WalletType getType() => WalletType.monero;
+
   @override
   Future<MoneroWallet> create(MoneroNewWalletCredentials credentials) async {
     try {
-      final path =
+      final path = await pathForWallet(name: credentials.name, type: getType());
-          await pathForWallet(name: credentials.name, type: WalletType.monero);
       await monero_wallet_manager.createWallet(
           path: path,
           password: credentials.password,
           language: credentials.language);
-      final wallet = MoneroWallet(
+      final wallet = MoneroWallet(walletInfo: credentials.walletInfo);
-          filename: monero_wallet.getFilename(),
-          walletInfo: credentials.walletInfo);
       await wallet.init();
 
       return wallet;
@@ -93,7 +93,7 @@ class MoneroWalletService extends WalletService<
   @override
   Future<bool> isWalletExit(String name) async {
     try {
-      final path = await pathForWallet(name: name, type: WalletType.monero);
+      final path = await pathForWallet(name: name, type: getType());
       return monero_wallet_manager.isWalletExist(path: path);
     } catch (e) {
       // TODO: Implement Exception for wallet list service.
@@ -105,7 +105,7 @@ class MoneroWalletService extends WalletService<
   @override
   Future<MoneroWallet> openWallet(String name, String password) async {
     try {
-      final path = await pathForWallet(name: name, type: WalletType.monero);
+      final path = await pathForWallet(name: name, type: getType());
 
       if (walletFilesExist(path)) {
         await repairOldAndroidWallet(name);
@@ -114,10 +114,9 @@ class MoneroWalletService extends WalletService<
       await monero_wallet_manager
           .openWalletAsync({'path': path, 'password': password});
       final walletInfo = walletInfoSource.values.firstWhere(
-          (info) => info.id == WalletBase.idFor(name, WalletType.monero),
+          (info) => info.id == WalletBase.idFor(name, getType()),
           orElse: () => null);
-      final wallet = MoneroWallet(
+      final wallet = MoneroWallet(walletInfo: walletInfo);
-          filename: monero_wallet.getFilename(), walletInfo: walletInfo);
       final isValid = wallet.validate();
 
       if (!isValid) {
@@ -146,7 +145,7 @@ class MoneroWalletService extends WalletService<
 
   @override
   Future<void> remove(String wallet) async {
-    final path = await pathForWalletDir(name: wallet, type: WalletType.monero);
+    final path = await pathForWalletDir(name: wallet, type: getType());
     final file = Directory(path);
     final isExist = file.existsSync();
 
@@ -159,8 +158,7 @@ class MoneroWalletService extends WalletService<
   Future<MoneroWallet> restoreFromKeys(
       MoneroRestoreWalletFromKeysCredentials credentials) async {
     try {
-      final path =
+      final path = await pathForWallet(name: credentials.name, type: getType());
-          await pathForWallet(name: credentials.name, type: WalletType.monero);
       await monero_wallet_manager.restoreFromKeys(
           path: path,
           password: credentials.password,
@@ -169,9 +167,7 @@ class MoneroWalletService extends WalletService<
           address: credentials.address,
           viewKey: credentials.viewKey,
           spendKey: credentials.spendKey);
-      final wallet = MoneroWallet(
+      final wallet = MoneroWallet(walletInfo: credentials.walletInfo);
-          filename: monero_wallet.getFilename(),
-          walletInfo: credentials.walletInfo);
       await wallet.init();
 
       return wallet;
@@ -186,16 +182,13 @@ class MoneroWalletService extends WalletService<
   Future<MoneroWallet> restoreFromSeed(
       MoneroRestoreWalletFromSeedCredentials credentials) async {
     try {
-      final path =
+      final path = await pathForWallet(name: credentials.name, type: getType());
-          await pathForWallet(name: credentials.name, type: WalletType.monero);
       await monero_wallet_manager.restoreFromSeed(
           path: path,
           password: credentials.password,
           seed: credentials.mnemonic,
           restoreHeight: credentials.height);
-      final wallet = MoneroWallet(
+      final wallet = MoneroWallet(walletInfo: credentials.walletInfo);
-          filename: monero_wallet.getFilename(),
-          walletInfo: credentials.walletInfo);
       await wallet.init();
 
       return wallet;
@@ -221,14 +214,14 @@ class MoneroWalletService extends WalletService<
       }
 
       final newWalletDirPath =
-          await pathForWalletDir(name: name, type: WalletType.monero);
+          await pathForWalletDir(name: name, type: getType());
 
       dir.listSync().forEach((f) {
         final file = File(f.path);
         final name = f.path.split('/').last;
         final newPath = newWalletDirPath + '/$name';
         final newFile = File(newPath);
-        print(file.path);
+
         if (!newFile.existsSync()) {
           newFile.createSync();
         }

lib/reactions/check_connection.dart

@@ -7,19 +7,22 @@ import 'package:connectivity/connectivity.dart';
 
 Timer _checkConnectionTimer;
 
-void startCheckConnectionReaction(WalletBase wallet, SettingsStore settingsStore, {int timeInterval = 5}) {
+void startCheckConnectionReaction(
+    WalletBase wallet, SettingsStore settingsStore,
+    {int timeInterval = 5}) {
   _checkConnectionTimer?.cancel();
-  _checkConnectionTimer = Timer.periodic(Duration(seconds: timeInterval), (_) async {
+  _checkConnectionTimer =
-    final connectivityResult = await (Connectivity().checkConnectivity());
+      Timer.periodic(Duration(seconds: timeInterval), (_) async {
+    try {
+      final connectivityResult = await (Connectivity().checkConnectivity());
 
-    if (connectivityResult == ConnectivityResult.none) {
+      if (connectivityResult == ConnectivityResult.none) {
-      wallet.syncStatus = FailedSyncStatus();
+        wallet.syncStatus = FailedSyncStatus();
-      return;
+        return;
-    }
+      }
 
-    if (wallet.syncStatus is LostConnectionSyncStatus ||
+      if (wallet.syncStatus is LostConnectionSyncStatus ||
-        wallet.syncStatus is FailedSyncStatus) {
+          wallet.syncStatus is FailedSyncStatus) {
-      try {
         final alive =
             await settingsStore.getCurrentNode(wallet.type).requestNode();
 
@@ -27,9 +30,9 @@ void startCheckConnectionReaction(WalletBase wallet, SettingsStore settingsStore
           await wallet.connectToNode(
               node: settingsStore.getCurrentNode(wallet.type));
         }
-      } catch (_) {
-        // FIXME: empty catch clojure
       }
+    } catch (e) {
+      print(e.toString());
     }
   });
 }

lib/reactions/on_current_wallet_change.dart

@@ -1,4 +1,6 @@
+import 'package:cake_wallet/core/transaction_history.dart';
 import 'package:cake_wallet/entities/balance.dart';
+import 'package:cake_wallet/entities/transaction_info.dart';
 import 'package:mobx/mobx.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:cake_wallet/di.dart';
@@ -18,9 +20,11 @@ ReactionDisposer _onCurrentWalletChangeFiatRateUpdateReaction;
 void startCurrentWalletChangeReaction(AppStore appStore,
     SettingsStore settingsStore, FiatConversionStore fiatConversionStore) {
   _onCurrentWalletChangeReaction?.reaction?.dispose();
+  _onCurrentWalletChangeFiatRateUpdateReaction?.reaction?.dispose();
 
-  _onCurrentWalletChangeReaction =
+  _onCurrentWalletChangeReaction = reaction((_) => appStore.wallet, (WalletBase<
-      reaction((_) => appStore.wallet, (WalletBase<Balance> wallet) async {
+          Balance, TransactionHistoryBase<TransactionInfo>, TransactionInfo>
+      wallet) async {
     try {
       final node = settingsStore.getCurrentNode(wallet.type);
       startWalletSyncStatusChangeReaction(wallet);
@@ -45,7 +49,9 @@ void startCurrentWalletChangeReaction(AppStore appStore,
   });
 
   _onCurrentWalletChangeFiatRateUpdateReaction =
-      reaction((_) => appStore.wallet, (WalletBase<Balance> wallet) async {
+      reaction((_) => appStore.wallet, (WalletBase<Balance,
+              TransactionHistoryBase<TransactionInfo>, TransactionInfo>
+          wallet) async {
     try {
       fiatConversionStore.prices[wallet.currency] = 0;
       fiatConversionStore.prices[wallet.currency] =

lib/reactions/on_wallet_sync_status_change.dart

@@ -1,16 +1,21 @@
-import 'package:cake_wallet/entities/balance.dart';
 import 'package:mobx/mobx.dart';
+import 'package:cake_wallet/core/transaction_history.dart';
 import 'package:cake_wallet/core/wallet_base.dart';
+import 'package:cake_wallet/entities/balance.dart';
+import 'package:cake_wallet/entities/transaction_info.dart';
 import 'package:cake_wallet/entities/sync_status.dart';
 
 ReactionDisposer _onWalletSyncStatusChangeReaction;
 
-void startWalletSyncStatusChangeReaction(WalletBase<Balance> wallet) {
+void startWalletSyncStatusChangeReaction(
+    WalletBase<Balance, TransactionHistoryBase<TransactionInfo>,
+            TransactionInfo>
+        wallet) {
   _onWalletSyncStatusChangeReaction?.reaction?.dispose();
   _onWalletSyncStatusChangeReaction =
       reaction((_) => wallet.syncStatus, (SyncStatus status) async {
-        if (status is ConnectedSyncStatus) {
+    if (status is ConnectedSyncStatus) {
-          await wallet.startSync();
+      await wallet.startSync();
-        }
+    }
-      });
+  });
-}
+}

lib/router.dart

@@ -239,9 +239,11 @@ Route<dynamic> createRoute(RouteSettings settings) {
     case Routes.unlock:
       return MaterialPageRoute<void>(
           fullscreenDialog: true,
-          builder: (_) => getIt.get<AuthPage>(
+          builder: (_) => WillPopScope(
-              param1: settings.arguments as OnAuthenticationFinished,
+              child: getIt.get<AuthPage>(
-              param2: false));
+                  param1: settings.arguments as OnAuthenticationFinished,
+                  param2: false),
+              onWillPop: () async => false));
 
     case Routes.nodeList:
       return CupertinoPageRoute<void>(

lib/src/screens/dashboard/dashboard_page.dart

@@ -1,7 +1,9 @@
 import 'package:cake_wallet/entities/wallet_type.dart';
 import 'package:cake_wallet/generated/i18n.dart';
 import 'package:cake_wallet/routes.dart';
+import 'package:cake_wallet/src/widgets/alert_with_one_action.dart';
 import 'package:cake_wallet/themes/theme_base.dart';
+import 'package:cake_wallet/utils/show_pop_up.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:cake_wallet/view_model/dashboard/dashboard_view_model.dart';
@@ -14,6 +16,7 @@ import 'package:cake_wallet/src/screens/dashboard/widgets/transactions_page.dart
 import 'package:cake_wallet/src/screens/dashboard/widgets/sync_indicator.dart';
 import 'package:cake_wallet/view_model/wallet_address_list/wallet_address_list_view_model.dart';
 import 'package:flutter_mobx/flutter_mobx.dart';
+import 'package:mobx/mobx.dart';
 import 'package:smooth_page_indicator/smooth_page_indicator.dart';
 import 'package:flutter_spinkit/flutter_spinkit.dart';
 
@@ -24,8 +27,8 @@ class DashboardPage extends BasePage {
   });
 
   @override
-  Color get backgroundLightColor => currentTheme.type == ThemeType.bright
+  Color get backgroundLightColor =>
-      ? Colors.transparent : Colors.white;
+      currentTheme.type == ThemeType.bright ? Colors.transparent : Colors.white;
 
   @override
   Color get backgroundDarkColor => Colors.transparent;
@@ -42,7 +45,7 @@ class DashboardPage extends BasePage {
           child: scaffold);
 
   @override
-  bool get resizeToAvoidBottomPadding => false;
+  bool get resizeToAvoidBottomInset => false;
 
   @override
   Widget get endDrawer => MenuWidget(walletViewModel);
@@ -54,9 +57,8 @@ class DashboardPage extends BasePage {
 
   @override
   Widget trailing(BuildContext context) {
-    final menuButton =
+    final menuButton = Image.asset('assets/images/menu.png',
-        Image.asset('assets/images/menu.png',
+        color: Theme.of(context).accentTextTheme.display3.backgroundColor);
-            color: Theme.of(context).accentTextTheme.display3.backgroundColor);
 
     return Container(
         alignment: Alignment.centerRight,
@@ -79,15 +81,18 @@ class DashboardPage extends BasePage {
   @override
   Widget body(BuildContext context) {
     final sendImage = Image.asset('assets/images/upload.png',
-        height: 22.24, width: 24,
+        height: 22.24,
+        width: 24,
         color: Theme.of(context).accentTextTheme.display3.backgroundColor);
     final exchangeImage = Image.asset('assets/images/transfer.png',
-        height: 24.27, width: 22.25,
+        height: 24.27,
+        width: 22.25,
         color: Theme.of(context).accentTextTheme.display3.backgroundColor);
     final buyImage = Image.asset('assets/images/coins.png',
-        height: 22.24, width: 24,
+        height: 22.24,
+        width: 24,
         color: Theme.of(context).accentTextTheme.display3.backgroundColor);
-    _setEffects();
+    _setEffects(context);
 
     return SafeArea(
         child: Column(
@@ -109,12 +114,14 @@ class DashboardPage extends BasePage {
                   dotWidth: 6.0,
                   dotHeight: 6.0,
                   dotColor: Theme.of(context).indicatorColor,
-                  activeDotColor: Theme.of(context).accentTextTheme.display1
+                  activeDotColor: Theme.of(context)
+                      .accentTextTheme
+                      .display1
                       .backgroundColor),
             )),
         Container(
           padding: EdgeInsets.only(left: 45, right: 45, bottom: 24),
-          child: Observer(builder: (_) => Row(
+          child: Row(
             mainAxisAlignment: MainAxisAlignment.spaceAround,
             children: <Widget>[
               ActionButton(
@@ -125,21 +132,20 @@ class DashboardPage extends BasePage {
                   image: exchangeImage,
                   title: S.of(context).exchange,
                   route: Routes.exchange),
-              if (walletViewModel.type == WalletType.bitcoin) ActionButton(
+              ActionButton(
-                image: buyImage,
+                  image: buyImage,
-                title: S.of(context).buy,
+                  title: S.of(context).buy,
-                onClick: () {
+                  onClick: () async =>
-                  Navigator.of(context).pushNamed(Routes.preOrder);
+                    await _onClickBuyButton(context),
-                },
               ),
             ],
-          )),
+          ),
         )
       ],
     ));
   }
 
-  void _setEffects() {
+  void _setEffects(BuildContext context) {
     if (_isEffectsInstalled) {
       return;
     }
@@ -148,6 +154,45 @@ class DashboardPage extends BasePage {
     pages.add(BalancePage(dashboardViewModel: walletViewModel));
     pages.add(TransactionsPage(dashboardViewModel: walletViewModel));
 
+    autorun((_) async {
+      if (!walletViewModel.isOutdatedElectrumWallet) {
+        return;
+      }
+
+      await Future<void>.delayed(Duration(seconds: 1));
+      await showPopUp<void>(
+          context: context,
+          builder: (BuildContext context) {
+            return AlertWithOneAction(
+                alertTitle: S.of(context).pre_seed_title,
+                alertContent:
+                    S.of(context).outdated_electrum_wallet_desceription,
+                buttonText: S.of(context).understand,
+                buttonAction: () => Navigator.of(context).pop());
+          });
+    });
+
     _isEffectsInstalled = true;
   }
+
+  Future<void> _onClickBuyButton(BuildContext context) async {
+    final walletType = walletViewModel.type;
+
+    switch (walletType) {
+      case WalletType.bitcoin:
+        Navigator.of(context).pushNamed(Routes.preOrder);
+        break;
+      default:
+        await showPopUp<void>(
+            context: context,
+            builder: (BuildContext context) {
+              return AlertWithOneAction(
+                  alertTitle: S.of(context).buy,
+                  alertContent: S.of(context).buy_alert_content,
+                  buttonText: S.of(context).ok,
+                  buttonAction: () => Navigator.of(context).pop());
+            });
+        break;
+    }
+  }
 }

lib/src/screens/dashboard/widgets/menu_widget.dart

@@ -21,6 +21,7 @@ class MenuWidget extends StatefulWidget {
 class MenuWidgetState extends State<MenuWidget> {
   Image moneroIcon;
   Image bitcoinIcon;
+  Image litecoinIcon;
   final largeScreen = 731;
 
   double menuWidth;
@@ -76,6 +77,7 @@ class MenuWidgetState extends State<MenuWidget> {
         color: Theme.of(context).accentTextTheme.overline.decorationColor);
     bitcoinIcon = Image.asset('assets/images/bitcoin_menu.png',
         color: Theme.of(context).accentTextTheme.overline.decorationColor);
+    litecoinIcon = Image.asset('assets/images/litecoin_menu.png');
 
     return Row(
       mainAxisSize: MainAxisSize.max,
@@ -238,6 +240,8 @@ class MenuWidgetState extends State<MenuWidget> {
         return moneroIcon;
       case WalletType.bitcoin:
         return bitcoinIcon;
+      case WalletType.litecoin:
+        return litecoinIcon;
       default:
         return null;
     }

lib/src/screens/exchange/exchange_page.dart

@@ -248,7 +248,8 @@ class ExchangePage extends BasePage {
                                   exchangeViewModel
                                       .isReceiveAddressEnabled,
                                   isAmountEstimated: true,
-                                  currencies: CryptoCurrency.all,
+                                  currencies:
+                                    exchangeViewModel.receiveCurrencies,
                                   onCurrencySelected: (currency) =>
                                       exchangeViewModel
                                           .changeReceiveCurrency(

lib/src/screens/new_wallet/new_wallet_type_page.dart

@@ -59,6 +59,8 @@ class WalletTypeFormState extends State<WalletTypeForm> {
       Image.asset('assets/images/monero_logo.png', height: 24, width: 24);
   final bitcoinIcon =
       Image.asset('assets/images/bitcoin.png', height: 24, width: 24);
+  final litecoinIcon =
+      Image.asset('assets/images/litecoin_icon.png', height: 24, width: 24);
   final walletTypeImage = Image.asset('assets/images/wallet_type.png');
   final walletTypeLightImage =
       Image.asset('assets/images/wallet_type_light.png');
@@ -69,7 +71,7 @@ class WalletTypeFormState extends State<WalletTypeForm> {
 
   @override
   void initState() {
-    types = [WalletType.bitcoin, WalletType.monero];
+    types = [WalletType.bitcoin, WalletType.monero, WalletType.litecoin];
     super.initState();
   }
 
@@ -84,8 +86,7 @@ class WalletTypeFormState extends State<WalletTypeForm> {
             padding: EdgeInsets.only(left: 12, right: 12),
             child: AspectRatio(
                 aspectRatio: aspectRatioImage,
-                child:
+                child: FittedBox(child: widget.walletImage, fit: BoxFit.fill)),
-                FittedBox(child: widget.walletImage, fit: BoxFit.fill)),
           ),
           Padding(
             padding: EdgeInsets.only(top: 48),
@@ -99,13 +100,13 @@ class WalletTypeFormState extends State<WalletTypeForm> {
             ),
           ),
           ...types.map((type) => Padding(
-            padding: EdgeInsets.only(top: 24),
+                padding: EdgeInsets.only(top: 24),
-            child: SelectButton(
+                child: SelectButton(
-                image: _iconFor(type),
+                    image: _iconFor(type),
-                text: walletTypeToDisplayName(type),
+                    text: walletTypeToDisplayName(type),
-                isSelected: selected == type,
+                    isSelected: selected == type,
-                onTap: () => setState(() => selected = type)),
+                    onTap: () => setState(() => selected = type)),
-          ))
+              ))
         ],
       ),
       bottomSectionPadding: EdgeInsets.only(left: 24, right: 24, bottom: 24),
@@ -125,6 +126,8 @@ class WalletTypeFormState extends State<WalletTypeForm> {
         return moneroIcon;
       case WalletType.bitcoin:
         return bitcoinIcon;
+      case WalletType.litecoin:
+        return litecoinIcon;
       default:
         return null;
     }

lib/src/screens/nodes/nodes_list_page.dart

@@ -87,7 +87,7 @@ class NodeListPage extends BasePage {
                 final isSelected =
                     node.keyIndex == nodeListViewModel.currentNode?.keyIndex;
                 final nodeListRow = NodeListRow(
-                    title: node.uri,
+                    title: node.uriRaw,
                     isSelected: isSelected,
                     isAlive: node.requestNode(),
                     onTap: (_) async {
@@ -101,8 +101,9 @@ class NodeListPage extends BasePage {
                             return AlertWithTwoActions(
                                 alertTitle:
                                     S.of(context).change_current_node_title,
-                                alertContent:
+                                alertContent: S
-                                    S.of(context).change_current_node(node.uri),
+                                    .of(context)
+                                    .change_current_node(node.uriRaw),
                                 leftButtonText: S.of(context).cancel,
                                 rightButtonText: S.of(context).change,
                                 actionLeftButton: () =>