updates & verification for electrum currencies

cw_bitcoin/lib/electrum_wallet.dart

@@ -1229,6 +1229,15 @@ abstract class ElectrumWalletBase
     return base64Encode(HD.signMessage(message));
   }
 
+  @override
+  Future<bool> verifyMessage(String message, String signature, {String? address = null}) async {
+    final index = address != null
+        ? walletAddresses.allAddresses.firstWhere((element) => element.address == address).index
+        : null;
+    final HD = index == null ? hd : hd.derive(index);
+    return HD.verify(message: message, signature: base64Decode(signature));
+  }
+
   static BasedUtxoNetwork _getNetwork(bitcoin.NetworkType networkType, CryptoCurrency? currency) {
     if (networkType == bitcoin.bitcoin && currency == CryptoCurrency.bch) {
       return BitcoinCashNetwork.mainnet;

cw_bitcoin_cash/lib/src/bitcoin_cash_wallet.dart

@@ -175,4 +175,15 @@ abstract class BitcoinCashWalletBase extends ElectrumWallet with Store {
     final HD = index == null ? hd : hd.derive(index);
     return base64Encode(HD.signMessage(message));
   }
+
+  @override
+  Future<bool> verifyMessage(String message, String signature, {String? address = null}) async {
+    final index = address != null
+        ? walletAddresses.allAddresses
+            .firstWhere((element) => element.address == AddressUtils.toLegacyAddress(address))
+            .index
+        : null;
+    final HD = index == null ? hd : hd.derive(index);
+    return HD.verify(message: message, signature: base64Decode(signature));
+  }
 }

cw_core/lib/wallet_base.dart

@@ -67,7 +67,6 @@ abstract class WalletBase<BalanceType extends Balance, HistoryType extends Trans
 
   int calculateEstimatedFee(TransactionPriority priority, int? amount);
 
-
   // void fetchTransactionsAsync(
   //     void Function(TransactionType transaction) onTransactionLoaded,
   //     {void Function() onFinished});
@@ -88,7 +87,11 @@ abstract class WalletBase<BalanceType extends Balance, HistoryType extends Trans
 
   Future<void> renameWalletFiles(String newWalletName);
 
-  Future<String> signMessage(String message, {String? address = null}) => throw UnimplementedError();
+  Future<String> signMessage(String message, {String? address = null}) =>
+      throw UnimplementedError();
+
+  Future<bool> verifyMessage(String message, String signature, {String? address = null}) =>
+      throw UnimplementedError();
 
   bool? isTestnet;
 }

cw_ethereum/lib/ethereum_wallet.dart

@@ -119,6 +119,11 @@ class EthereumWallet extends EVMChainWallet {
     return EthereumTransactionHistory(walletInfo: walletInfo, password: password);
   }
 
+  @override
+  Future<String> signMessage(String message, {String? address}) async {
+    throw UnimplementedError();
+  }
+
   static Future<EthereumWallet> open(
       {required String name, required String password, required WalletInfo walletInfo}) async {
     final path = await pathForWallet(name: name, type: walletInfo.type);

cw_solana/lib/solana_wallet.dart

@@ -527,5 +527,10 @@ abstract class SolanaWalletBase
     return signSolanaMessage(message);
   }
 
+  @override
+  Future<String> verifyMessage(String message, String signature, {String? address}) async {
+    throw UnimplementedError();
+  }
+
   SolanaClient? get solanaClient => _client.getSolanaClient;
 }