Cw 688 avoid wallet file corruption (#1582)

* CW-688 Store Seed and keys in .keys file

* CW-688 Open wallet from keys in .keys file and migrate wallets using the old file

* CW-688 Open wallet from keys in .keys file and migrate wallets using the old file

* CW-688 Restore .keys file from .keys.backup

* CW-688 Restore .keys file from .keys.backup

* CW-688 Move saving .keys files into the save function instead of the service

* CW-688 Handle corrupt wallets

* CW-688 Handle corrupt wallets

* CW-688 Remove code duplication

* CW-688 Reduce cache dependency

* wrap any file reading/writing function with try/catch [skip ci]

---------

Co-authored-by: Konstantin Ullrich <konstantinullrich12@gmail.com>

cw_bitcoin/lib/bitcoin_wallet.dart

@@ -6,15 +6,16 @@ import 'package:bitcoin_flutter/bitcoin_flutter.dart' as bitcoin;
 import 'package:convert/convert.dart';
 import 'package:cw_bitcoin/bitcoin_address_record.dart';
 import 'package:cw_bitcoin/bitcoin_mnemonic.dart';
-import 'package:cw_bitcoin/electrum_derivations.dart';
 import 'package:cw_bitcoin/bitcoin_wallet_addresses.dart';
 import 'package:cw_bitcoin/electrum_balance.dart';
+import 'package:cw_bitcoin/electrum_derivations.dart';
 import 'package:cw_bitcoin/electrum_wallet.dart';
 import 'package:cw_bitcoin/electrum_wallet_snapshot.dart';
 import 'package:cw_bitcoin/psbt_transaction_builder.dart';
 import 'package:cw_core/crypto_currency.dart';
 import 'package:cw_core/unspent_coins_info.dart';
 import 'package:cw_core/wallet_info.dart';
+import 'package:cw_core/wallet_keys_file.dart';
 import 'package:flutter/foundation.dart';
 import 'package:hive/hive.dart';
 import 'package:ledger_bitcoin/ledger_bitcoin.dart';
@@ -143,49 +144,66 @@ abstract class BitcoinWalletBase extends ElectrumWallet with Store {
     final network = walletInfo.network != null
         ? BasedUtxoNetwork.fromName(walletInfo.network!)
         : BitcoinNetwork.mainnet;
-    final snp = await ElectrumWalletSnapshot.load(name, walletInfo.type, password, network);
 
-    walletInfo.derivationInfo ??= DerivationInfo(
+    final hasKeysFile = await WalletKeysFile.hasKeysFile(name, walletInfo.type);
-      derivationType: snp.derivationType ?? DerivationType.electrum,
+
-      derivationPath: snp.derivationPath,
+    ElectrumWalletSnapshot? snp = null;
-    );
+
+    try {
+      snp = await ElectrumWalletSnapshot.load(name, walletInfo.type, password, network);
+    } catch (e) {
+      if (!hasKeysFile) rethrow;
+    }
+
+    final WalletKeysData keysData;
+    // Migrate wallet from the old scheme to then new .keys file scheme
+    if (!hasKeysFile) {
+      keysData =
+          WalletKeysData(mnemonic: snp!.mnemonic, xPub: snp.xpub, passphrase: snp.passphrase);
+    } else {
+      keysData = await WalletKeysFile.readKeysFile(name, walletInfo.type, password);
+    }
+
+    walletInfo.derivationInfo ??= DerivationInfo();
 
     // set the default if not present:
-    walletInfo.derivationInfo!.derivationPath = snp.derivationPath ?? electrum_path;
+    walletInfo.derivationInfo!.derivationPath ??= snp?.derivationPath ?? electrum_path;
-    walletInfo.derivationInfo!.derivationType = snp.derivationType ?? DerivationType.electrum;
+    walletInfo.derivationInfo!.derivationType ??= snp?.derivationType ?? DerivationType.electrum;
 
     Uint8List? seedBytes = null;
+    final mnemonic = keysData.mnemonic;
+    final passphrase = keysData.passphrase;
 
-    if (snp.mnemonic != null) {
+    if (mnemonic != null) {
       switch (walletInfo.derivationInfo!.derivationType) {
         case DerivationType.electrum:
-          seedBytes = await mnemonicToSeedBytes(snp.mnemonic!);
+          seedBytes = await mnemonicToSeedBytes(mnemonic);
           break;
         case DerivationType.bip39:
         default:
           seedBytes = await bip39.mnemonicToSeed(
-            snp.mnemonic!,
+            mnemonic,
-            passphrase: snp.passphrase ?? '',
+            passphrase: passphrase ?? '',
           );
           break;
       }
     }
 
     return BitcoinWallet(
-      mnemonic: snp.mnemonic,
+      mnemonic: mnemonic,
-      xpub: snp.xpub,
+      xpub: keysData.xPub,
       password: password,
-      passphrase: snp.passphrase,
+      passphrase: passphrase,
       walletInfo: walletInfo,
       unspentCoinsInfo: unspentCoinsInfo,
-      initialAddresses: snp.addresses,
+      initialAddresses: snp?.addresses,
-      initialSilentAddresses: snp.silentAddresses,
+      initialSilentAddresses: snp?.silentAddresses,
-      initialSilentAddressIndex: snp.silentAddressIndex,
+      initialSilentAddressIndex: snp?.silentAddressIndex ?? 0,
-      initialBalance: snp.balance,
+      initialBalance: snp?.balance,
       seedBytes: seedBytes,
-      initialRegularAddressIndex: snp.regularAddressIndex,
+      initialRegularAddressIndex: snp?.regularAddressIndex,
-      initialChangeAddressIndex: snp.changeAddressIndex,
+      initialChangeAddressIndex: snp?.changeAddressIndex,
-      addressPageType: snp.addressPageType,
+      addressPageType: snp?.addressPageType,
       networkParam: network,
       alwaysScan: alwaysScan,
     );
@@ -249,8 +267,8 @@ abstract class BitcoinWalletBase extends ElectrumWallet with Store {
       final accountPath = walletInfo.derivationInfo?.derivationPath;
       final derivationPath = accountPath != null ? "$accountPath/$isChange/$index" : null;
 
-      final signature = await _bitcoinLedgerApp!
+      final signature = await _bitcoinLedgerApp!.signMessage(_ledgerDevice!,
-          .signMessage(_ledgerDevice!, message: ascii.encode(message), signDerivationPath: derivationPath);
+          message: ascii.encode(message), signDerivationPath: derivationPath);
       return base64Encode(signature);
     }
 

cw_bitcoin/lib/bitcoin_wallet_service.dart

@@ -41,8 +41,10 @@ class BitcoinWalletService extends WalletService<
       unspentCoinsInfo: unspentCoinsInfoSource,
       network: network,
     );
+
     await wallet.save();
     await wallet.init();
+
     return wallet;
   }
 

cw_bitcoin/lib/electrum_wallet.dart

@@ -37,6 +37,7 @@ import 'package:cw_core/unspent_coins_info.dart';
 import 'package:cw_core/utils/file.dart';
 import 'package:cw_core/wallet_base.dart';
 import 'package:cw_core/wallet_info.dart';
+import 'package:cw_core/wallet_keys_file.dart';
 import 'package:cw_core/wallet_type.dart';
 import 'package:cw_core/get_height_by_date.dart';
 import 'package:flutter/foundation.dart';
@@ -54,7 +55,7 @@ const int TWEAKS_COUNT = 25;
 
 abstract class ElectrumWalletBase
     extends WalletBase<ElectrumBalance, ElectrumTransactionHistory, ElectrumTransactionInfo>
-    with Store {
+    with Store, WalletKeysFile {
   ElectrumWalletBase({
     required String password,
     required WalletInfo walletInfo,
@@ -169,6 +170,10 @@ abstract class ElectrumWalletBase
   @override
   String? get seed => _mnemonic;
 
+  @override
+  WalletKeysData get walletKeysData =>
+      WalletKeysData(mnemonic: _mnemonic, xPub: xpub, passphrase: passphrase);
+
   bitcoin.NetworkType networkType;
   BasedUtxoNetwork network;
 
@@ -1076,6 +1081,11 @@ abstract class ElectrumWalletBase
 
   @override
   Future<void> save() async {
+    if (!(await WalletKeysFile.hasKeysFile(walletInfo.name, walletInfo.type))) {
+      await saveKeysFile(_password);
+      saveKeysFile(_password, true);
+    }
+
     final path = await makePath();
     await write(path: path, password: _password, data: toJSON());
     await transactionHistory.save();
@@ -1131,8 +1141,6 @@ abstract class ElectrumWalletBase
     _autoSaveTimer?.cancel();
   }
 
-  Future<String> makePath() async => pathForWallet(name: walletInfo.name, type: walletInfo.type);
-
   @action
   Future<void> updateAllUnspents() async {
     List<BitcoinUnspent> updatedUnspentCoins = [];

cw_bitcoin/lib/electrum_wallet_snapshot.dart

@@ -32,15 +32,21 @@ class ElectrumWalletSnapshot {
   final WalletType type;
   final String? addressPageType;
 
+  @deprecated
   String? mnemonic;
+
+  @deprecated
   String? xpub;
+
+  @deprecated
+  String? passphrase;
+
   List<BitcoinAddressRecord> addresses;
   List<BitcoinSilentPaymentAddressRecord> silentAddresses;
   ElectrumBalance balance;
   Map<String, int> regularAddressIndex;
   Map<String, int> changeAddressIndex;
   int silentAddressIndex;
-  String? passphrase;
   DerivationType? derivationType;
   String? derivationPath;
 

cw_bitcoin/lib/litecoin_wallet.dart

@@ -1,20 +1,21 @@
+import 'package:bip39/bip39.dart' as bip39;
 import 'package:bitcoin_base/bitcoin_base.dart';
+import 'package:cw_bitcoin/bitcoin_address_record.dart';
 import 'package:cw_bitcoin/bitcoin_mnemonic.dart';
 import 'package:cw_bitcoin/bitcoin_transaction_priority.dart';
-import 'package:cw_core/crypto_currency.dart';
+import 'package:cw_bitcoin/electrum_balance.dart';
-import 'package:cw_core/unspent_coins_info.dart';
+import 'package:cw_bitcoin/electrum_wallet.dart';
+import 'package:cw_bitcoin/electrum_wallet_snapshot.dart';
+import 'package:cw_bitcoin/litecoin_network.dart';
 import 'package:cw_bitcoin/litecoin_wallet_addresses.dart';
+import 'package:cw_core/crypto_currency.dart';
 import 'package:cw_core/transaction_priority.dart';
+import 'package:cw_core/unspent_coins_info.dart';
+import 'package:cw_core/wallet_info.dart';
+import 'package:cw_core/wallet_keys_file.dart';
 import 'package:flutter/foundation.dart';
 import 'package:hive/hive.dart';
 import 'package:mobx/mobx.dart';
-import 'package:cw_core/wallet_info.dart';
-import 'package:cw_bitcoin/electrum_wallet_snapshot.dart';
-import 'package:cw_bitcoin/electrum_wallet.dart';
-import 'package:cw_bitcoin/bitcoin_address_record.dart';
-import 'package:cw_bitcoin/electrum_balance.dart';
-import 'package:cw_bitcoin/litecoin_network.dart';
-import 'package:bip39/bip39.dart' as bip39;
 
 part 'litecoin_wallet.g.dart';
 
@@ -101,19 +102,37 @@ abstract class LitecoinWalletBase extends ElectrumWallet with Store {
     required Box<UnspentCoinsInfo> unspentCoinsInfo,
     required String password,
   }) async {
-    final snp =
+    final hasKeysFile = await WalletKeysFile.hasKeysFile(name, walletInfo.type);
-        await ElectrumWalletSnapshot.load(name, walletInfo.type, password, LitecoinNetwork.mainnet);
+
+    ElectrumWalletSnapshot? snp = null;
+
+    try {
+      snp = await ElectrumWalletSnapshot.load(
+          name, walletInfo.type, password, LitecoinNetwork.mainnet);
+    } catch (e) {
+      if (!hasKeysFile) rethrow;
+    }
+
+    final WalletKeysData keysData;
+    // Migrate wallet from the old scheme to then new .keys file scheme
+    if (!hasKeysFile) {
+      keysData =
+          WalletKeysData(mnemonic: snp!.mnemonic, xPub: snp.xpub, passphrase: snp.passphrase);
+    } else {
+      keysData = await WalletKeysFile.readKeysFile(name, walletInfo.type, password);
+    }
+
     return LitecoinWallet(
-      mnemonic: snp.mnemonic!,
+      mnemonic: keysData.mnemonic!,
       password: password,
       walletInfo: walletInfo,
       unspentCoinsInfo: unspentCoinsInfo,
-      initialAddresses: snp.addresses,
+      initialAddresses: snp?.addresses,
-      initialBalance: snp.balance,
+      initialBalance: snp?.balance,
-      seedBytes: await mnemonicToSeedBytes(snp.mnemonic!),
+      seedBytes: await mnemonicToSeedBytes(keysData.mnemonic!),
-      initialRegularAddressIndex: snp.regularAddressIndex,
+      initialRegularAddressIndex: snp?.regularAddressIndex,
-      initialChangeAddressIndex: snp.changeAddressIndex,
+      initialChangeAddressIndex: snp?.changeAddressIndex,
-      addressPageType: snp.addressPageType,
+      addressPageType: snp?.addressPageType,
     );
   }
 

cw_bitcoin/lib/litecoin_wallet_service.dart

@@ -33,6 +33,7 @@ class LitecoinWalletService extends WalletService<
         passphrase: credentials.passphrase,
         walletInfo: credentials.walletInfo!,
         unspentCoinsInfo: unspentCoinsInfoSource);
+
     await wallet.save();
     await wallet.init();
 

cw_bitcoin_cash/lib/src/bitcoin_cash_wallet.dart

@@ -12,6 +12,7 @@ import 'package:cw_core/crypto_currency.dart';
 import 'package:cw_core/transaction_priority.dart';
 import 'package:cw_core/unspent_coins_info.dart';
 import 'package:cw_core/wallet_info.dart';
+import 'package:cw_core/wallet_keys_file.dart';
 import 'package:flutter/foundation.dart';
 import 'package:hive/hive.dart';
 import 'package:mobx/mobx.dart';
@@ -89,14 +90,32 @@ abstract class BitcoinCashWalletBase extends ElectrumWallet with Store {
     required Box<UnspentCoinsInfo> unspentCoinsInfo,
     required String password,
   }) async {
-    final snp = await ElectrumWalletSnapshot.load(
+    final hasKeysFile = await WalletKeysFile.hasKeysFile(name, walletInfo.type);
-        name, walletInfo.type, password, BitcoinCashNetwork.mainnet);
+
+    ElectrumWalletSnapshot? snp = null;
+
+    try {
+      snp = await ElectrumWalletSnapshot.load(
+          name, walletInfo.type, password, BitcoinCashNetwork.mainnet);
+    } catch (e) {
+      if (!hasKeysFile) rethrow;
+    }
+
+    final WalletKeysData keysData;
+    // Migrate wallet from the old scheme to then new .keys file scheme
+    if (!hasKeysFile) {
+      keysData =
+          WalletKeysData(mnemonic: snp!.mnemonic, xPub: snp.xpub, passphrase: snp.passphrase);
+    } else {
+      keysData = await WalletKeysFile.readKeysFile(name, walletInfo.type, password);
+    }
+
     return BitcoinCashWallet(
-      mnemonic: snp.mnemonic!,
+      mnemonic: keysData.mnemonic!,
       password: password,
       walletInfo: walletInfo,
       unspentCoinsInfo: unspentCoinsInfo,
-      initialAddresses: snp.addresses.map((addr) {
+      initialAddresses: snp?.addresses.map((addr) {
         try {
           BitcoinCashAddress(addr.address);
           return BitcoinAddressRecord(
@@ -116,10 +135,10 @@ abstract class BitcoinCashWalletBase extends ElectrumWallet with Store {
           );
         }
       }).toList(),
-      initialBalance: snp.balance,
+      initialBalance: snp?.balance,
-      seedBytes: await Mnemonic.toSeed(snp.mnemonic!),
+      seedBytes: await Mnemonic.toSeed(keysData.mnemonic!),
-      initialRegularAddressIndex: snp.regularAddressIndex,
+      initialRegularAddressIndex: snp?.regularAddressIndex,
-      initialChangeAddressIndex: snp.changeAddressIndex,
+      initialChangeAddressIndex: snp?.changeAddressIndex,
       addressPageType: P2pkhAddressType.p2pkh,
     );
   }

cw_bitcoin_cash/lib/src/bitcoin_cash_wallet_service.dart

@@ -34,8 +34,10 @@ class BitcoinCashWalletService extends WalletService<BitcoinCashNewWalletCredent
         password: credentials.password!,
         walletInfo: credentials.walletInfo!,
         unspentCoinsInfo: unspentCoinsInfoSource);
+
     await wallet.save();
     await wallet.init();
+
     return wallet;
   }
 

cw_core/lib/wallet_keys_file.dart

@@ -0,0 +1,110 @@
+import 'dart:convert';
+import 'dart:developer' as dev;
+import 'dart:io';
+
+import 'package:cw_core/balance.dart';
+import 'package:cw_core/pathForWallet.dart';
+import 'package:cw_core/transaction_history.dart';
+import 'package:cw_core/transaction_info.dart';
+import 'package:cw_core/utils/file.dart';
+import 'package:cw_core/wallet_base.dart';
+import 'package:cw_core/wallet_type.dart';
+
+mixin WalletKeysFile<BalanceType extends Balance, HistoryType extends TransactionHistoryBase,
+        TransactionType extends TransactionInfo>
+    on WalletBase<BalanceType, HistoryType, TransactionType> {
+  Future<String> makePath() => pathForWallet(name: walletInfo.name, type: walletInfo.type);
+
+  // this needs to be overridden
+  WalletKeysData get walletKeysData;
+
+  Future<String> makeKeysFilePath() async => "${await makePath()}.keys";
+
+  Future<void> saveKeysFile(String password, [bool isBackup = false]) async {
+    try {
+      final rootPath = await makeKeysFilePath();
+      final path = "$rootPath${isBackup ? ".backup" : ""}";
+      dev.log("Saving .keys file '$path'");
+      await write(path: path, password: password, data: walletKeysData.toJSON());
+    } catch (_) {}
+  }
+
+  static Future<void> createKeysFile(
+      String name, WalletType type, String password, WalletKeysData walletKeysData,
+      [bool withBackup = true]) async {
+    try {
+      final rootPath = await pathForWallet(name: name, type: type);
+      final path = "$rootPath.keys";
+
+      dev.log("Saving .keys file '$path'");
+      await write(path: path, password: password, data: walletKeysData.toJSON());
+
+      if (withBackup) {
+        dev.log("Saving .keys.backup file '$path.backup'");
+        await write(path: "$path.backup", password: password, data: walletKeysData.toJSON());
+      }
+    } catch (_) {}
+  }
+
+  static Future<bool> hasKeysFile(String name, WalletType type) async {
+    try {
+      final path = await pathForWallet(name: name, type: type);
+      return File("$path.keys").existsSync() || File("$path.keys.backup").existsSync();
+    } catch (_) {
+      return false;
+    }
+  }
+
+  static Future<WalletKeysData> readKeysFile(String name, WalletType type, String password) async {
+    final path = await pathForWallet(name: name, type: type);
+
+    var readPath = "$path.keys";
+    try {
+      if (!File(readPath).existsSync()) throw Exception("No .keys file found for $name $type");
+
+      final jsonSource = await read(path: readPath, password: password);
+      final data = json.decode(jsonSource) as Map<String, dynamic>;
+      return WalletKeysData.fromJSON(data);
+    } catch (e) {
+      dev.log("Failed to read .keys file. Trying .keys.backup file...");
+
+      readPath = "$readPath.backup";
+      if (!File(readPath).existsSync())
+        throw Exception("No .keys nor a .keys.backup file found for $name $type");
+
+      final jsonSource = await read(path: readPath, password: password);
+      final data = json.decode(jsonSource) as Map<String, dynamic>;
+      final keysData = WalletKeysData.fromJSON(data);
+
+      dev.log("Restoring .keys from .keys.backup");
+      createKeysFile(name, type, password, keysData, false);
+      return keysData;
+    }
+  }
+}
+
+class WalletKeysData {
+  final String? privateKey;
+  final String? mnemonic;
+  final String? altMnemonic;
+  final String? passphrase;
+  final String? xPub;
+
+  WalletKeysData({this.privateKey, this.mnemonic, this.altMnemonic, this.passphrase, this.xPub});
+
+  String toJSON() => jsonEncode({
+        "privateKey": privateKey,
+        "mnemonic": mnemonic,
+        if (altMnemonic != null) "altMnemonic": altMnemonic,
+        if (passphrase != null) "passphrase": passphrase,
+        if (xPub != null) "xPub": xPub
+      });
+
+  static WalletKeysData fromJSON(Map<String, dynamic> json) => WalletKeysData(
+        privateKey: json["privateKey"] as String?,
+        mnemonic: json["mnemonic"] as String?,
+        altMnemonic: json["altMnemonic"] as String?,
+        passphrase: json["passphrase"] as String?,
+        xPub: json["xPub"] as String?,
+      );
+}

cw_ethereum/lib/ethereum_wallet.dart

@@ -6,6 +6,7 @@ import 'package:cw_core/erc20_token.dart';
 import 'package:cw_core/pathForWallet.dart';
 import 'package:cw_core/transaction_direction.dart';
 import 'package:cw_core/wallet_info.dart';
+import 'package:cw_core/wallet_keys_file.dart';
 import 'package:cw_ethereum/default_ethereum_erc20_tokens.dart';
 import 'package:cw_ethereum/ethereum_client.dart';
 import 'package:cw_ethereum/ethereum_transaction_history.dart';
@@ -122,19 +123,37 @@ class EthereumWallet extends EVMChainWallet {
 
   static Future<EthereumWallet> open(
       {required String name, required String password, required WalletInfo walletInfo}) async {
+    final hasKeysFile = await WalletKeysFile.hasKeysFile(name, walletInfo.type);
     final path = await pathForWallet(name: name, type: walletInfo.type);
-    final jsonSource = await read(path: path, password: password);
+
-    final data = json.decode(jsonSource) as Map;
+    Map<String, dynamic>? data;
-    final mnemonic = data['mnemonic'] as String?;
+    try {
-    final privateKey = data['private_key'] as String?;
+      final jsonSource = await read(path: path, password: password);
-    final balance = EVMChainERC20Balance.fromJSON(data['balance'] as String) ??
+
+      data = json.decode(jsonSource) as Map<String, dynamic>;
+    } catch (e) {
+      if (!hasKeysFile) rethrow;
+    }
+
+    final balance = EVMChainERC20Balance.fromJSON(data?['balance'] as String) ??
         EVMChainERC20Balance(BigInt.zero);
 
+    final WalletKeysData keysData;
+    // Migrate wallet from the old scheme to then new .keys file scheme
+    if (!hasKeysFile) {
+      final mnemonic = data!['mnemonic'] as String?;
+      final privateKey = data['private_key'] as String?;
+
+      keysData = WalletKeysData(mnemonic: mnemonic, privateKey: privateKey);
+    } else {
+      keysData = await WalletKeysFile.readKeysFile(name, walletInfo.type, password);
+    }
+
     return EthereumWallet(
       walletInfo: walletInfo,
       password: password,
-      mnemonic: mnemonic,
+      mnemonic: keysData.mnemonic,
-      privateKey: privateKey,
+      privateKey: keysData.privateKey,
       initialBalance: balance,
       client: EthereumClient(),
     );

cw_evm/lib/evm_chain_wallet.dart

@@ -16,6 +16,7 @@ import 'package:cw_core/transaction_priority.dart';
 import 'package:cw_core/wallet_addresses.dart';
 import 'package:cw_core/wallet_base.dart';
 import 'package:cw_core/wallet_info.dart';
+import 'package:cw_core/wallet_keys_file.dart';
 import 'package:cw_core/wallet_type.dart';
 import 'package:cw_evm/evm_chain_client.dart';
 import 'package:cw_evm/evm_chain_exceptions.dart';
@@ -58,7 +59,7 @@ abstract class EVMChainWallet = EVMChainWalletBase with _$EVMChainWallet;
 
 abstract class EVMChainWalletBase
     extends WalletBase<EVMChainERC20Balance, EVMChainTransactionHistory, EVMChainTransactionInfo>
-    with Store {
+    with Store, WalletKeysFile {
   EVMChainWalletBase({
     required WalletInfo walletInfo,
     required EVMChainClient client,
@@ -508,6 +509,11 @@ abstract class EVMChainWalletBase
 
   @override
   Future<void> save() async {
+    if (!(await WalletKeysFile.hasKeysFile(walletInfo.name, walletInfo.type))) {
+      await saveKeysFile(_password);
+      saveKeysFile(_password, true);
+    }
+
     await walletAddresses.updateAddressesInBox();
     final path = await makePath();
     await write(path: path, password: _password, data: toJSON());
@@ -522,7 +528,8 @@ abstract class EVMChainWalletBase
       ? HEX.encode((evmChainPrivateKey as EthPrivateKey).privateKey)
       : null;
 
-  Future<String> makePath() async => pathForWallet(name: walletInfo.name, type: walletInfo.type);
+  @override
+  WalletKeysData get walletKeysData => WalletKeysData(mnemonic: _mnemonic, privateKey: privateKey);
 
   String toJSON() => json.encode({
         'mnemonic': _mnemonic,

cw_nano/lib/nano_wallet.dart

@@ -1,8 +1,12 @@
+import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
+import 'package:bip39/bip39.dart' as bip39;
 import 'package:cw_core/cake_hive.dart';
 import 'package:cw_core/crypto_currency.dart';
+import 'package:cw_core/n2_node.dart';
+import 'package:cw_core/nano_account.dart';
 import 'package:cw_core/nano_account_info_response.dart';
 import 'package:cw_core/node.dart';
 import 'package:cw_core/pathForWallet.dart';
@@ -10,23 +14,20 @@ import 'package:cw_core/pending_transaction.dart';
 import 'package:cw_core/sync_status.dart';
 import 'package:cw_core/transaction_direction.dart';
 import 'package:cw_core/transaction_priority.dart';
+import 'package:cw_core/wallet_base.dart';
 import 'package:cw_core/wallet_info.dart';
+import 'package:cw_core/wallet_keys_file.dart';
 import 'package:cw_nano/file.dart';
-import 'package:cw_core/nano_account.dart';
-import 'package:cw_core/n2_node.dart';
 import 'package:cw_nano/nano_balance.dart';
 import 'package:cw_nano/nano_client.dart';
 import 'package:cw_nano/nano_transaction_credentials.dart';
 import 'package:cw_nano/nano_transaction_history.dart';
 import 'package:cw_nano/nano_transaction_info.dart';
+import 'package:cw_nano/nano_wallet_addresses.dart';
 import 'package:cw_nano/nano_wallet_keys.dart';
 import 'package:cw_nano/pending_nano_transaction.dart';
 import 'package:mobx/mobx.dart';
-import 'dart:async';
-import 'package:cw_nano/nano_wallet_addresses.dart';
-import 'package:cw_core/wallet_base.dart';
 import 'package:nanodart/nanodart.dart';
-import 'package:bip39/bip39.dart' as bip39;
 import 'package:nanoutil/nanoutil.dart';
 
 part 'nano_wallet.g.dart';
@@ -34,7 +35,8 @@ part 'nano_wallet.g.dart';
 class NanoWallet = NanoWalletBase with _$NanoWallet;
 
 abstract class NanoWalletBase
-    extends WalletBase<NanoBalance, NanoTransactionHistory, NanoTransactionInfo> with Store {
+    extends WalletBase<NanoBalance, NanoTransactionHistory, NanoTransactionInfo>
+    with Store, WalletKeysFile {
   NanoWalletBase({
     required WalletInfo walletInfo,
     required String mnemonic,
@@ -70,6 +72,7 @@ abstract class NanoWalletBase
 
   String? _representativeAddress;
   int repScore = 100;
+
   bool get isRepOk => repScore >= 90;
 
   late final NanoClient _client;
@@ -128,14 +131,10 @@ abstract class NanoWalletBase
   }
 
   @override
-  int calculateEstimatedFee(TransactionPriority priority, int? amount) {
+  int calculateEstimatedFee(TransactionPriority priority, int? amount) => 0; // always 0 :)
-    return 0; // always 0 :)
-  }
 
   @override
-  Future<void> changePassword(String password) {
+  Future<void> changePassword(String password) => throw UnimplementedError("changePassword");
-    throw UnimplementedError("changePassword");
-  }
 
   @override
   void close() {
@@ -170,9 +169,7 @@ abstract class NanoWalletBase
   }
 
   @override
-  Future<void> connectToPowNode({required Node node}) async {
+  Future<void> connectToPowNode({required Node node}) async => _client.connectPow(node);
-    _client.connectPow(node);
-  }
 
   @override
   Future<PendingTransaction> createTransaction(Object credentials) async {
@@ -296,9 +293,7 @@ abstract class NanoWalletBase
   }
 
   @override
-  NanoWalletKeys get keys {
+  NanoWalletKeys get keys => NanoWalletKeys(seedKey: _hexSeed!);
-    return NanoWalletKeys(seedKey: _hexSeed!);
-  }
 
   @override
   String? get privateKey => _privateKey!;
@@ -312,6 +307,11 @@ abstract class NanoWalletBase
 
   @override
   Future<void> save() async {
+    if (!(await WalletKeysFile.hasKeysFile(walletInfo.name, walletInfo.type))) {
+      await saveKeysFile(_password);
+      saveKeysFile(_password, true);
+    }
+
     await walletAddresses.updateAddressesInBox();
     final path = await makePath();
     await write(path: path, password: _password, data: toJSON());
@@ -323,6 +323,9 @@ abstract class NanoWalletBase
 
   String get hexSeed => _hexSeed!;
 
+  @override
+  WalletKeysData get walletKeysData => WalletKeysData(mnemonic: _mnemonic, altMnemonic: hexSeed);
+
   String get representative => _representativeAddress ?? "";
 
   @action
@@ -358,8 +361,6 @@ abstract class NanoWalletBase
     }
   }
 
-  Future<String> makePath() async => pathForWallet(name: walletInfo.name, type: walletInfo.type);
-
   String toJSON() => json.encode({
         'seedKey': _hexSeed,
         'mnemonic': _mnemonic,
@@ -373,31 +374,47 @@ abstract class NanoWalletBase
     required String password,
     required WalletInfo walletInfo,
   }) async {
+    final hasKeysFile = await WalletKeysFile.hasKeysFile(name, walletInfo.type);
     final path = await pathForWallet(name: name, type: walletInfo.type);
-    final jsonSource = await read(path: path, password: password);
 
-    final data = json.decode(jsonSource) as Map;
+    Map<String, dynamic>? data = null;
-    final mnemonic = data['mnemonic'] as String;
+    try {
+      final jsonSource = await read(path: path, password: password);
+
+      data = json.decode(jsonSource) as Map<String, dynamic>;
+    } catch (e) {
+      if (!hasKeysFile) rethrow;
+    }
 
     final balance = NanoBalance.fromRawString(
-      currentBalance: data['currentBalance'] as String? ?? "0",
+      currentBalance: data?['currentBalance'] as String? ?? "0",
-      receivableBalance: data['receivableBalance'] as String? ?? "0",
+      receivableBalance: data?['receivableBalance'] as String? ?? "0",
     );
 
+    final WalletKeysData keysData;
+    // Migrate wallet from the old scheme to then new .keys file scheme
+    if (!hasKeysFile) {
+      final mnemonic = data!['mnemonic'] as String;
+      final isHexSeed = !mnemonic.contains(' ');
+
+      keysData = WalletKeysData(
+          mnemonic: isHexSeed ? null : mnemonic, altMnemonic: isHexSeed ? mnemonic : null);
+    } else {
+      keysData = await WalletKeysFile.readKeysFile(name, walletInfo.type, password);
+    }
+
     DerivationType derivationType = DerivationType.nano;
-    if (data['derivationType'] == "DerivationType.bip39") {
+    if (data?['derivationType'] == "DerivationType.bip39") {
       derivationType = DerivationType.bip39;
     }
 
     walletInfo.derivationInfo ??= DerivationInfo(derivationType: derivationType);
-    if (walletInfo.derivationInfo!.derivationType == null) {
+    walletInfo.derivationInfo!.derivationType ??= derivationType;
-      walletInfo.derivationInfo!.derivationType = derivationType;
-    }
 
     return NanoWallet(
       walletInfo: walletInfo,
       password: password,
-      mnemonic: mnemonic,
+      mnemonic: keysData.mnemonic!,
       initialBalance: balance,
     );
     // init() should always be run after this!
@@ -435,7 +452,7 @@ abstract class NanoWalletBase
       _representativeAddress = await _client.getRepFromPrefs();
       throw Exception("Failed to get representative address $e");
     }
-    
+
     repScore = await _client.getRepScore(_representativeAddress!);
   }
 

cw_nano/lib/nano_wallet_service.dart

@@ -39,7 +39,7 @@ class NanoWalletService extends WalletService<NanoNewWalletCredentials,
       mnemonic: mnemonic,
       password: credentials.password!,
     );
-    wallet.init();
+    await wallet.init();
     return wallet;
   }
 

cw_polygon/lib/polygon_wallet.dart

@@ -1,11 +1,12 @@
 import 'dart:convert';
 
-import 'package:cw_core/crypto_currency.dart';
 import 'package:cw_core/cake_hive.dart';
+import 'package:cw_core/crypto_currency.dart';
 import 'package:cw_core/erc20_token.dart';
 import 'package:cw_core/pathForWallet.dart';
 import 'package:cw_core/transaction_direction.dart';
 import 'package:cw_core/wallet_info.dart';
+import 'package:cw_core/wallet_keys_file.dart';
 import 'package:cw_evm/evm_chain_transaction_history.dart';
 import 'package:cw_evm/evm_chain_transaction_info.dart';
 import 'package:cw_evm/evm_chain_transaction_model.dart';
@@ -13,9 +14,9 @@ import 'package:cw_evm/evm_chain_wallet.dart';
 import 'package:cw_evm/evm_erc20_balance.dart';
 import 'package:cw_evm/file.dart';
 import 'package:cw_polygon/default_polygon_erc20_tokens.dart';
-import 'package:cw_polygon/polygon_transaction_info.dart';
 import 'package:cw_polygon/polygon_client.dart';
 import 'package:cw_polygon/polygon_transaction_history.dart';
+import 'package:cw_polygon/polygon_transaction_info.dart';
 
 class PolygonWallet extends EVMChainWallet {
   PolygonWallet({
@@ -97,19 +98,37 @@ class PolygonWallet extends EVMChainWallet {
 
   static Future<PolygonWallet> open(
       {required String name, required String password, required WalletInfo walletInfo}) async {
+    final hasKeysFile = await WalletKeysFile.hasKeysFile(name, walletInfo.type);
     final path = await pathForWallet(name: name, type: walletInfo.type);
-    final jsonSource = await read(path: path, password: password);
+
-    final data = json.decode(jsonSource) as Map;
+    Map<String, dynamic>? data;
-    final mnemonic = data['mnemonic'] as String?;
+    try {
-    final privateKey = data['private_key'] as String?;
+      final jsonSource = await read(path: path, password: password);
-    final balance = EVMChainERC20Balance.fromJSON(data['balance'] as String) ??
+
+      data = json.decode(jsonSource) as Map<String, dynamic>;
+    } catch (e) {
+      if (!hasKeysFile) rethrow;
+    }
+
+    final balance = EVMChainERC20Balance.fromJSON(data?['balance'] as String) ??
         EVMChainERC20Balance(BigInt.zero);
 
+    final WalletKeysData keysData;
+    // Migrate wallet from the old scheme to then new .keys file scheme
+    if (!hasKeysFile) {
+      final mnemonic = data!['mnemonic'] as String?;
+      final privateKey = data['private_key'] as String?;
+
+      keysData = WalletKeysData(mnemonic: mnemonic, privateKey: privateKey);
+    } else {
+      keysData = await WalletKeysFile.readKeysFile(name, walletInfo.type, password);
+    }
+
     return PolygonWallet(
       walletInfo: walletInfo,
       password: password,
-      mnemonic: mnemonic,
+      mnemonic: keysData.mnemonic,
-      privateKey: privateKey,
+      privateKey: keysData.privateKey,
       initialBalance: balance,
       client: PolygonClient(),
     );

cw_polygon/lib/polygon_wallet_service.dart

@@ -35,7 +35,6 @@ class PolygonWalletService extends EVMChainWalletService<PolygonWallet> {
     await wallet.init();
     wallet.addInitialTokens();
     await wallet.save();
-
     return wallet;
   }
 
@@ -83,7 +82,6 @@ class PolygonWalletService extends EVMChainWalletService<PolygonWallet> {
     await wallet.init();
     wallet.addInitialTokens();
     await wallet.save();
-
     return wallet;
   }
 

cw_solana/lib/solana_wallet.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
+
 import 'package:cw_core/cake_hive.dart';
 import 'package:cw_core/crypto_currency.dart';
 import 'package:cw_core/node.dart';
@@ -12,6 +13,7 @@ import 'package:cw_core/transaction_priority.dart';
 import 'package:cw_core/wallet_addresses.dart';
 import 'package:cw_core/wallet_base.dart';
 import 'package:cw_core/wallet_info.dart';
+import 'package:cw_core/wallet_keys_file.dart';
 import 'package:cw_solana/default_spl_tokens.dart';
 import 'package:cw_solana/file.dart';
 import 'package:cw_solana/solana_balance.dart';
@@ -36,7 +38,8 @@ part 'solana_wallet.g.dart';
 class SolanaWallet = SolanaWalletBase with _$SolanaWallet;
 
 abstract class SolanaWalletBase
-    extends WalletBase<SolanaBalance, SolanaTransactionHistory, SolanaTransactionInfo> with Store {
+    extends WalletBase<SolanaBalance, SolanaTransactionHistory, SolanaTransactionInfo>
+    with Store, WalletKeysFile {
   SolanaWalletBase({
     required WalletInfo walletInfo,
     String? mnemonic,
@@ -121,6 +124,9 @@ abstract class SolanaWalletBase
     return privateKey;
   }
 
+  @override
+  WalletKeysData get walletKeysData => WalletKeysData(mnemonic: _mnemonic, privateKey: privateKey);
+
   Future<void> init() async {
     final boxName = "${walletInfo.name.replaceAll(" ", "_")}_${SPLToken.boxName}";
 
@@ -336,6 +342,11 @@ abstract class SolanaWalletBase
 
   @override
   Future<void> save() async {
+    if (!(await WalletKeysFile.hasKeysFile(walletInfo.name, walletInfo.type))) {
+      await saveKeysFile(_password);
+      saveKeysFile(_password, true);
+    }
+
     await walletAddresses.updateAddressesInBox();
     final path = await makePath();
     await write(path: path, password: _password, data: toJSON());
@@ -361,8 +372,6 @@ abstract class SolanaWalletBase
     }
   }
 
-  Future<String> makePath() async => pathForWallet(name: walletInfo.name, type: walletInfo.type);
-
   String toJSON() => json.encode({
         'mnemonic': _mnemonic,
         'private_key': _hexPrivateKey,
@@ -374,18 +383,36 @@ abstract class SolanaWalletBase
     required String password,
     required WalletInfo walletInfo,
   }) async {
+    final hasKeysFile = await WalletKeysFile.hasKeysFile(name, walletInfo.type);
     final path = await pathForWallet(name: name, type: walletInfo.type);
-    final jsonSource = await read(path: path, password: password);
+
-    final data = json.decode(jsonSource) as Map;
+    Map<String, dynamic>? data;
-    final mnemonic = data['mnemonic'] as String?;
+    try {
-    final privateKey = data['private_key'] as String?;
+      final jsonSource = await read(path: path, password: password);
-    final balance = SolanaBalance.fromJSON(data['balance'] as String) ?? SolanaBalance(0.0);
+
+      data = json.decode(jsonSource) as Map<String, dynamic>;
+    } catch (e) {
+      if (!hasKeysFile) rethrow;
+    }
+
+    final balance = SolanaBalance.fromJSON(data?['balance'] as String) ?? SolanaBalance(0.0);
+
+    final WalletKeysData keysData;
+    // Migrate wallet from the old scheme to then new .keys file scheme
+    if (!hasKeysFile) {
+      final mnemonic = data!['mnemonic'] as String?;
+      final privateKey = data['private_key'] as String?;
+
+      keysData = WalletKeysData(mnemonic: mnemonic, privateKey: privateKey);
+    } else {
+      keysData = await WalletKeysFile.readKeysFile(name, walletInfo.type, password);
+    }
 
     return SolanaWallet(
       walletInfo: walletInfo,
       password: password,
-      mnemonic: mnemonic,
+      mnemonic: keysData.mnemonic,
-      privateKey: privateKey,
+      privateKey: keysData.privateKey,
       initialBalance: balance,
     );
   }

cw_tron/lib/tron_wallet.dart

@@ -16,6 +16,7 @@ import 'package:cw_core/transaction_priority.dart';
 import 'package:cw_core/wallet_addresses.dart';
 import 'package:cw_core/wallet_base.dart';
 import 'package:cw_core/wallet_info.dart';
+import 'package:cw_core/wallet_keys_file.dart';
 import 'package:cw_core/wallet_type.dart';
 import 'package:cw_tron/default_tron_tokens.dart';
 import 'package:cw_tron/file.dart';
@@ -37,7 +38,8 @@ part 'tron_wallet.g.dart';
 class TronWallet = TronWalletBase with _$TronWallet;
 
 abstract class TronWalletBase
-    extends WalletBase<TronBalance, TronTransactionHistory, TronTransactionInfo> with Store {
+    extends WalletBase<TronBalance, TronTransactionHistory, TronTransactionInfo>
+    with Store, WalletKeysFile {
   TronWalletBase({
     required WalletInfo walletInfo,
     String? mnemonic,
@@ -124,18 +126,36 @@ abstract class TronWalletBase
     required String password,
     required WalletInfo walletInfo,
   }) async {
+    final hasKeysFile = await WalletKeysFile.hasKeysFile(name, walletInfo.type);
     final path = await pathForWallet(name: name, type: walletInfo.type);
-    final jsonSource = await read(path: path, password: password);
+
-    final data = json.decode(jsonSource) as Map;
+    Map<String, dynamic>? data;
-    final mnemonic = data['mnemonic'] as String?;
+    try {
-    final privateKey = data['private_key'] as String?;
+      final jsonSource = await read(path: path, password: password);
-    final balance = TronBalance.fromJSON(data['balance'] as String) ?? TronBalance(BigInt.zero);
+
+      data = json.decode(jsonSource) as Map<String, dynamic>;
+    } catch (e) {
+      if (!hasKeysFile) rethrow;
+    }
+
+    final balance = TronBalance.fromJSON(data?['balance'] as String) ?? TronBalance(BigInt.zero);
+
+    final WalletKeysData keysData;
+    // Migrate wallet from the old scheme to then new .keys file scheme
+    if (!hasKeysFile) {
+      final mnemonic = data!['mnemonic'] as String?;
+      final privateKey = data['private_key'] as String?;
+
+      keysData = WalletKeysData(mnemonic: mnemonic, privateKey: privateKey);
+    } else {
+      keysData = await WalletKeysFile.readKeysFile(name, walletInfo.type, password);
+    }
 
     return TronWallet(
       walletInfo: walletInfo,
       password: password,
-      mnemonic: mnemonic,
+      mnemonic: keysData.mnemonic,
-      privateKey: privateKey,
+      privateKey: keysData.privateKey,
       initialBalance: balance,
     );
   }
@@ -163,9 +183,7 @@ abstract class TronWalletBase
   }) async {
     assert(mnemonic != null || privateKey != null);
 
-    if (privateKey != null) {
+    if (privateKey != null) return TronPrivateKey(privateKey);
-      return TronPrivateKey(privateKey);
-    }
 
     final seed = bip39.mnemonicToSeed(mnemonic!);
 
@@ -181,14 +199,10 @@ abstract class TronWalletBase
   int calculateEstimatedFee(TransactionPriority priority, int? amount) => 0;
 
   @override
-  Future<void> changePassword(String password) {
+  Future<void> changePassword(String password) => throw UnimplementedError("changePassword");
-    throw UnimplementedError("changePassword");
-  }
 
   @override
-  void close() {
+  void close() => _transactionsUpdateTimer?.cancel();
-    _transactionsUpdateTimer?.cancel();
-  }
 
   @action
   @override
@@ -406,12 +420,15 @@ abstract class TronWalletBase
   Object get keys => throw UnimplementedError("keys");
 
   @override
-  Future<void> rescan({required int height}) {
+  Future<void> rescan({required int height}) => throw UnimplementedError("rescan");
-    throw UnimplementedError("rescan");
-  }
 
   @override
   Future<void> save() async {
+    if (!(await WalletKeysFile.hasKeysFile(walletInfo.name, walletInfo.type))) {
+      await saveKeysFile(_password);
+      saveKeysFile(_password, true);
+    }
+
     await walletAddresses.updateAddressesInBox();
     final path = await makePath();
     await write(path: path, password: _password, data: toJSON());
@@ -424,7 +441,8 @@ abstract class TronWalletBase
   @override
   String get privateKey => _tronPrivateKey.toHex();
 
-  Future<String> makePath() async => pathForWallet(name: walletInfo.name, type: walletInfo.type);
+  @override
+  WalletKeysData get walletKeysData => WalletKeysData(mnemonic: _mnemonic, privateKey: privateKey);
 
   String toJSON() => json.encode({
         'mnemonic': _mnemonic,
@@ -512,7 +530,7 @@ abstract class TronWalletBase
 
   @override
   Future<void> renameWalletFiles(String newWalletName) async {
-    String transactionHistoryFileNameForWallet = 'tron_transactions.json';
+    const transactionHistoryFileNameForWallet = 'tron_transactions.json';
 
     final currentWalletPath = await pathForWallet(name: walletInfo.name, type: type);
     final currentWalletFile = File(currentWalletPath);
@@ -550,9 +568,7 @@ abstract class TronWalletBase
   Future<String> signMessage(String message, {String? address}) async =>
       _tronPrivateKey.signPersonalMessage(ascii.encode(message));
 
-  String getTronBase58AddressFromHex(String hexAddress) {
+  String getTronBase58AddressFromHex(String hexAddress) => TronAddress(hexAddress).toAddress();
-    return TronAddress(hexAddress).toAddress();
-  }
 
   void updateScanProviderUsageState(bool isEnabled) {
     if (isEnabled) {

cw_tron/lib/tron_wallet_service.dart

@@ -1,6 +1,7 @@
 import 'dart:io';
 
 import 'package:bip39/bip39.dart' as bip39;
+import 'package:collection/collection.dart';
 import 'package:cw_core/balance.dart';
 import 'package:cw_core/pathForWallet.dart';
 import 'package:cw_core/transaction_history.dart';
@@ -14,7 +15,6 @@ import 'package:cw_tron/tron_exception.dart';
 import 'package:cw_tron/tron_wallet.dart';
 import 'package:cw_tron/tron_wallet_creation_credentials.dart';
 import 'package:hive/hive.dart';
-import 'package:collection/collection.dart';
 
 class TronWalletService extends WalletService<
     TronNewWalletCredentials,
@@ -153,7 +153,8 @@ class TronWalletService extends WalletService<
   }
 
   @override
-  Future<WalletBase<Balance, TransactionHistoryBase<TransactionInfo>, TransactionInfo>> restoreFromHardwareWallet(TronNewWalletCredentials credentials) {
+  Future<WalletBase<Balance, TransactionHistoryBase<TransactionInfo>, TransactionInfo>>
+      restoreFromHardwareWallet(TronNewWalletCredentials credentials) {
     // TODO: implement restoreFromHardwareWallet
     throw UnimplementedError();
   }