diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9037e48..244af0a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@ Changelog
 =========
 =========
 
+#### Version 3.4.0
+* BREAKING CHANGES: Handle custom errors codes/messages
+
 #### Version 3.3.18
 * Add sc_call_function_params.dart in archethic_lib_dart.dart
 
diff --git a/lib/archethic_lib_dart.dart b/lib/archethic_lib_dart.dart
index 1989a21..b103ee0 100644
--- a/lib/archethic_lib_dart.dart
+++ b/lib/archethic_lib_dart.dart
@@ -57,6 +57,6 @@ export 'src/utils/confirmations/transaction_sender.dart';
 export 'src/utils/crypto.dart';
 export 'src/utils/notification_util.dart';
 export 'src/utils/oracle/archethic_oracle.dart';
-export 'src/utils/transaction_util.dart';
+export 'src/utils/transaction_error_util.dart';
 export 'src/utils/utils.dart';
 export 'src/utils/wallet_encoder.dart';
diff --git a/lib/src/utils/confirmations/archethic_transaction_sender.dart b/lib/src/utils/confirmations/archethic_transaction_sender.dart
index bbbb068..c21c881 100644
--- a/lib/src/utils/confirmations/archethic_transaction_sender.dart
+++ b/lib/src/utils/confirmations/archethic_transaction_sender.dart
@@ -159,13 +159,13 @@ class ArchethicTransactionSender
     TransactionErrorHandler onError,
   ) {
     _transactionErrorSubscription = _subscribe<TransactionError>(
-      'subscription { transactionError(address: "$address") { context, reason} }',
+      'subscription { transactionError(address: "$address") { context, error { code, data, message } } }',
     ).listen(
       (result) {
         close();
         final transactionError = _errorDtoToModel(result.data);
         log(
-          '>>> Transaction KO $address <<< (${transactionError.message})',
+          '>>> Transaction KO $address <<< (${transactionError.messageLabel})',
         );
         onError(
           transactionError,
@@ -211,23 +211,26 @@ mixin ArchethicTransactionParser {
   TransactionError _errorDtoToModel(Map<String, dynamic>? data) {
     try {
       final transactionError = data?['transactionError'];
-      final reason = transactionError?['reason'];
-
-      if (reason == 'Insufficient funds') {
-        return const TransactionError.insufficientFunds();
-      }
-
-      if (reason == 'consensus not reached') {
-        return const TransactionError.consensusNotReached();
-      }
+      if (transactionError['error'] != null) {
+        final error = transactionError?['error'];
+        final code = error['code'] as int;
+        switch (code) {
+          case -31000:
+            return const TransactionError.insufficientFunds();
+          case -31501:
+            return const TransactionError.consensusNotReached();
+          case -31502:
+            return const TransactionError.timeout();
+          default:
+        }
 
-      if (reason == 'timeout' || reason == 'connection timeout') {
-        return const TransactionError.timeout();
+        return TransactionError.other(
+          code: error['code'] as int,
+          data: error['data'],
+          message: error['message'],
+        );
       }
-
-      // TODO(reddwarf03): Handle other error types.
-
-      return TransactionError.other(reason: reason);
+      return const TransactionError.other();
     } catch (e) {
       return const TransactionError.other();
     }
diff --git a/lib/src/utils/confirmations/transaction_event.dart b/lib/src/utils/confirmations/transaction_event.dart
index 295904a..2999ad0 100644
--- a/lib/src/utils/confirmations/transaction_event.dart
+++ b/lib/src/utils/confirmations/transaction_event.dart
@@ -1,3 +1,4 @@
+import 'package:archethic_lib_dart/src/utils/transaction_error_util.dart';
 import 'package:freezed_annotation/freezed_annotation.dart';
 
 part 'transaction_event.freezed.dart';
@@ -28,10 +29,12 @@ class TransactionError with _$TransactionError implements Exception {
     Object? data,
   }) = _TransactionRPCError;
   const factory TransactionError.other({
-    String? reason,
+    int? code,
+    Object? data,
+    String? message,
   }) = _TransactionOtherError;
 
-  String get message => map(
+  String get messageLabel => map(
         timeout: (_) => 'connection timeout',
         connectivity: (_) => 'connectivity issue',
         consensusNotReached: (_) => 'consensus not reached',
@@ -43,7 +46,17 @@ class TransactionError with _$TransactionError implements Exception {
         userRejected: (_) => 'user rejected',
         unknownAccount: (_) => 'unknown account',
         rpcError: (_) => 'JSON RPC error',
-        other: (other) => other.reason ?? 'other reason',
+        other: (other) {
+          if (other.data != null && other.data is Map<String, dynamic>) {
+            final detailedMessage = extractTransactionErrorMessages(
+              other.data! as Map<String, dynamic>,
+            );
+            if (detailedMessage.isNotEmpty) {
+              return '${other.message}$detailedMessage';
+            }
+          }
+          return other.message ?? 'other error';
+        },
       );
 }
 
diff --git a/lib/src/utils/confirmations/transaction_event.freezed.dart b/lib/src/utils/confirmations/transaction_event.freezed.dart
index 1629286..515f4fe 100644
--- a/lib/src/utils/confirmations/transaction_event.freezed.dart
+++ b/lib/src/utils/confirmations/transaction_event.freezed.dart
@@ -29,7 +29,7 @@ mixin _$TransactionError {
     required TResult Function() userRejected,
     required TResult Function(String accountName) unknownAccount,
     required TResult Function(int code, String message, Object? data) rpcError,
-    required TResult Function(String? reason) other,
+    required TResult Function(int? code, Object? data, String? message) other,
   }) =>
       throw _privateConstructorUsedError;
   @optionalTypeArgs
@@ -45,7 +45,7 @@ mixin _$TransactionError {
     TResult? Function()? userRejected,
     TResult? Function(String accountName)? unknownAccount,
     TResult? Function(int code, String message, Object? data)? rpcError,
-    TResult? Function(String? reason)? other,
+    TResult? Function(int? code, Object? data, String? message)? other,
   }) =>
       throw _privateConstructorUsedError;
   @optionalTypeArgs
@@ -61,7 +61,7 @@ mixin _$TransactionError {
     TResult Function()? userRejected,
     TResult Function(String accountName)? unknownAccount,
     TResult Function(int code, String message, Object? data)? rpcError,
-    TResult Function(String? reason)? other,
+    TResult Function(int? code, Object? data, String? message)? other,
     required TResult orElse(),
   }) =>
       throw _privateConstructorUsedError;
@@ -194,7 +194,7 @@ class _$TransactionTimeoutImpl extends _TransactionTimeout {
     required TResult Function() userRejected,
     required TResult Function(String accountName) unknownAccount,
     required TResult Function(int code, String message, Object? data) rpcError,
-    required TResult Function(String? reason) other,
+    required TResult Function(int? code, Object? data, String? message) other,
   }) {
     return timeout();
   }
@@ -213,7 +213,7 @@ class _$TransactionTimeoutImpl extends _TransactionTimeout {
     TResult? Function()? userRejected,
     TResult? Function(String accountName)? unknownAccount,
     TResult? Function(int code, String message, Object? data)? rpcError,
-    TResult? Function(String? reason)? other,
+    TResult? Function(int? code, Object? data, String? message)? other,
   }) {
     return timeout?.call();
   }
@@ -232,7 +232,7 @@ class _$TransactionTimeoutImpl extends _TransactionTimeout {
     TResult Function()? userRejected,
     TResult Function(String accountName)? unknownAccount,
     TResult Function(int code, String message, Object? data)? rpcError,
-    TResult Function(String? reason)? other,
+    TResult Function(int? code, Object? data, String? message)? other,
     required TResult orElse(),
   }) {
     if (timeout != null) {
@@ -372,7 +372,7 @@ class _$TransactionConnectionErrorImpl extends _TransactionConnectionError {
     required TResult Function() userRejected,
     required TResult Function(String accountName) unknownAccount,
     required TResult Function(int code, String message, Object? data) rpcError,
-    required TResult Function(String? reason) other,
+    required TResult Function(int? code, Object? data, String? message) other,
   }) {
     return connectivity();
   }
@@ -391,7 +391,7 @@ class _$TransactionConnectionErrorImpl extends _TransactionConnectionError {
     TResult? Function()? userRejected,
     TResult? Function(String accountName)? unknownAccount,
     TResult? Function(int code, String message, Object? data)? rpcError,
-    TResult? Function(String? reason)? other,
+    TResult? Function(int? code, Object? data, String? message)? other,
   }) {
     return connectivity?.call();
   }
@@ -410,7 +410,7 @@ class _$TransactionConnectionErrorImpl extends _TransactionConnectionError {
     TResult Function()? userRejected,
     TResult Function(String accountName)? unknownAccount,
     TResult Function(int code, String message, Object? data)? rpcError,
-    TResult Function(String? reason)? other,
+    TResult Function(int? code, Object? data, String? message)? other,
     required TResult orElse(),
   }) {
     if (connectivity != null) {
@@ -552,7 +552,7 @@ class _$TransactionConsensusNotReachedErrorImpl
     required TResult Function() userRejected,
     required TResult Function(String accountName) unknownAccount,
     required TResult Function(int code, String message, Object? data) rpcError,
-    required TResult Function(String? reason) other,
+    required TResult Function(int? code, Object? data, String? message) other,
   }) {
     return consensusNotReached();
   }
@@ -571,7 +571,7 @@ class _$TransactionConsensusNotReachedErrorImpl
     TResult? Function()? userRejected,
     TResult? Function(String accountName)? unknownAccount,
     TResult? Function(int code, String message, Object? data)? rpcError,
-    TResult? Function(String? reason)? other,
+    TResult? Function(int? code, Object? data, String? message)? other,
   }) {
     return consensusNotReached?.call();
   }
@@ -590,7 +590,7 @@ class _$TransactionConsensusNotReachedErrorImpl
     TResult Function()? userRejected,
     TResult Function(String accountName)? unknownAccount,
     TResult Function(int code, String message, Object? data)? rpcError,
-    TResult Function(String? reason)? other,
+    TResult Function(int? code, Object? data, String? message)? other,
     required TResult orElse(),
   }) {
     if (consensusNotReached != null) {
@@ -727,7 +727,7 @@ class _$TransactionInvalidImpl extends _TransactionInvalid {
     required TResult Function() userRejected,
     required TResult Function(String accountName) unknownAccount,
     required TResult Function(int code, String message, Object? data) rpcError,
-    required TResult Function(String? reason) other,
+    required TResult Function(int? code, Object? data, String? message) other,
   }) {
     return invalidTransaction();
   }
@@ -746,7 +746,7 @@ class _$TransactionInvalidImpl extends _TransactionInvalid {
     TResult? Function()? userRejected,
     TResult? Function(String accountName)? unknownAccount,
     TResult? Function(int code, String message, Object? data)? rpcError,
-    TResult? Function(String? reason)? other,
+    TResult? Function(int? code, Object? data, String? message)? other,
   }) {
     return invalidTransaction?.call();
   }
@@ -765,7 +765,7 @@ class _$TransactionInvalidImpl extends _TransactionInvalid {
     TResult Function()? userRejected,
     TResult Function(String accountName)? unknownAccount,
     TResult Function(int code, String message, Object? data)? rpcError,
-    TResult Function(String? reason)? other,
+    TResult Function(int? code, Object? data, String? message)? other,
     required TResult orElse(),
   }) {
     if (invalidTransaction != null) {
@@ -906,7 +906,7 @@ class _$TransactionInvalidConfirmationImpl
     required TResult Function() userRejected,
     required TResult Function(String accountName) unknownAccount,
     required TResult Function(int code, String message, Object? data) rpcError,
-    required TResult Function(String? reason) other,
+    required TResult Function(int? code, Object? data, String? message) other,
   }) {
     return invalidConfirmation();
   }
@@ -925,7 +925,7 @@ class _$TransactionInvalidConfirmationImpl
     TResult? Function()? userRejected,
     TResult? Function(String accountName)? unknownAccount,
     TResult? Function(int code, String message, Object? data)? rpcError,
-    TResult? Function(String? reason)? other,
+    TResult? Function(int? code, Object? data, String? message)? other,
   }) {
     return invalidConfirmation?.call();
   }
@@ -944,7 +944,7 @@ class _$TransactionInvalidConfirmationImpl
     TResult Function()? userRejected,
     TResult Function(String accountName)? unknownAccount,
     TResult Function(int code, String message, Object? data)? rpcError,
-    TResult Function(String? reason)? other,
+    TResult Function(int? code, Object? data, String? message)? other,
     required TResult orElse(),
   }) {
     if (invalidConfirmation != null) {
@@ -1085,7 +1085,7 @@ class _$TransactionInsufficientFundsImpl extends _TransactionInsufficientFunds {
     required TResult Function() userRejected,
     required TResult Function(String accountName) unknownAccount,
     required TResult Function(int code, String message, Object? data) rpcError,
-    required TResult Function(String? reason) other,
+    required TResult Function(int? code, Object? data, String? message) other,
   }) {
     return insufficientFunds();
   }
@@ -1104,7 +1104,7 @@ class _$TransactionInsufficientFundsImpl extends _TransactionInsufficientFunds {
     TResult? Function()? userRejected,
     TResult? Function(String accountName)? unknownAccount,
     TResult? Function(int code, String message, Object? data)? rpcError,
-    TResult? Function(String? reason)? other,
+    TResult? Function(int? code, Object? data, String? message)? other,
   }) {
     return insufficientFunds?.call();
   }
@@ -1123,7 +1123,7 @@ class _$TransactionInsufficientFundsImpl extends _TransactionInsufficientFunds {
     TResult Function()? userRejected,
     TResult Function(String accountName)? unknownAccount,
     TResult Function(int code, String message, Object? data)? rpcError,
-    TResult Function(String? reason)? other,
+    TResult Function(int? code, Object? data, String? message)? other,
     required TResult orElse(),
   }) {
     if (insufficientFunds != null) {
@@ -1264,7 +1264,7 @@ class _$TransactionServiceNotFoundImpl extends _TransactionServiceNotFound {
     required TResult Function() userRejected,
     required TResult Function(String accountName) unknownAccount,
     required TResult Function(int code, String message, Object? data) rpcError,
-    required TResult Function(String? reason) other,
+    required TResult Function(int? code, Object? data, String? message) other,
   }) {
     return serviceNotFound();
   }
@@ -1283,7 +1283,7 @@ class _$TransactionServiceNotFoundImpl extends _TransactionServiceNotFound {
     TResult? Function()? userRejected,
     TResult? Function(String accountName)? unknownAccount,
     TResult? Function(int code, String message, Object? data)? rpcError,
-    TResult? Function(String? reason)? other,
+    TResult? Function(int? code, Object? data, String? message)? other,
   }) {
     return serviceNotFound?.call();
   }
@@ -1302,7 +1302,7 @@ class _$TransactionServiceNotFoundImpl extends _TransactionServiceNotFound {
     TResult Function()? userRejected,
     TResult Function(String accountName)? unknownAccount,
     TResult Function(int code, String message, Object? data)? rpcError,
-    TResult Function(String? reason)? other,
+    TResult Function(int? code, Object? data, String? message)? other,
     required TResult orElse(),
   }) {
     if (serviceNotFound != null) {
@@ -1444,7 +1444,7 @@ class _$TransactionServiceAlreadyExistsImpl
     required TResult Function() userRejected,
     required TResult Function(String accountName) unknownAccount,
     required TResult Function(int code, String message, Object? data) rpcError,
-    required TResult Function(String? reason) other,
+    required TResult Function(int? code, Object? data, String? message) other,
   }) {
     return serviceAlreadyExists();
   }
@@ -1463,7 +1463,7 @@ class _$TransactionServiceAlreadyExistsImpl
     TResult? Function()? userRejected,
     TResult? Function(String accountName)? unknownAccount,
     TResult? Function(int code, String message, Object? data)? rpcError,
-    TResult? Function(String? reason)? other,
+    TResult? Function(int? code, Object? data, String? message)? other,
   }) {
     return serviceAlreadyExists?.call();
   }
@@ -1482,7 +1482,7 @@ class _$TransactionServiceAlreadyExistsImpl
     TResult Function()? userRejected,
     TResult Function(String accountName)? unknownAccount,
     TResult Function(int code, String message, Object? data)? rpcError,
-    TResult Function(String? reason)? other,
+    TResult Function(int? code, Object? data, String? message)? other,
     required TResult orElse(),
   }) {
     if (serviceAlreadyExists != null) {
@@ -1622,7 +1622,7 @@ class _$TransactionUserRejectedImpl extends _TransactionUserRejected {
     required TResult Function() userRejected,
     required TResult Function(String accountName) unknownAccount,
     required TResult Function(int code, String message, Object? data) rpcError,
-    required TResult Function(String? reason) other,
+    required TResult Function(int? code, Object? data, String? message) other,
   }) {
     return userRejected();
   }
@@ -1641,7 +1641,7 @@ class _$TransactionUserRejectedImpl extends _TransactionUserRejected {
     TResult? Function()? userRejected,
     TResult? Function(String accountName)? unknownAccount,
     TResult? Function(int code, String message, Object? data)? rpcError,
-    TResult? Function(String? reason)? other,
+    TResult? Function(int? code, Object? data, String? message)? other,
   }) {
     return userRejected?.call();
   }
@@ -1660,7 +1660,7 @@ class _$TransactionUserRejectedImpl extends _TransactionUserRejected {
     TResult Function()? userRejected,
     TResult Function(String accountName)? unknownAccount,
     TResult Function(int code, String message, Object? data)? rpcError,
-    TResult Function(String? reason)? other,
+    TResult Function(int? code, Object? data, String? message)? other,
     required TResult orElse(),
   }) {
     if (userRejected != null) {
@@ -1828,7 +1828,7 @@ class _$TransactionUnknownAccountImpl extends _TransactionUnknownAccount {
     required TResult Function() userRejected,
     required TResult Function(String accountName) unknownAccount,
     required TResult Function(int code, String message, Object? data) rpcError,
-    required TResult Function(String? reason) other,
+    required TResult Function(int? code, Object? data, String? message) other,
   }) {
     return unknownAccount(accountName);
   }
@@ -1847,7 +1847,7 @@ class _$TransactionUnknownAccountImpl extends _TransactionUnknownAccount {
     TResult? Function()? userRejected,
     TResult? Function(String accountName)? unknownAccount,
     TResult? Function(int code, String message, Object? data)? rpcError,
-    TResult? Function(String? reason)? other,
+    TResult? Function(int? code, Object? data, String? message)? other,
   }) {
     return unknownAccount?.call(accountName);
   }
@@ -1866,7 +1866,7 @@ class _$TransactionUnknownAccountImpl extends _TransactionUnknownAccount {
     TResult Function()? userRejected,
     TResult Function(String accountName)? unknownAccount,
     TResult Function(int code, String message, Object? data)? rpcError,
-    TResult Function(String? reason)? other,
+    TResult Function(int? code, Object? data, String? message)? other,
     required TResult orElse(),
   }) {
     if (unknownAccount != null) {
@@ -2051,7 +2051,7 @@ class _$TransactionRPCErrorImpl extends _TransactionRPCError {
     required TResult Function() userRejected,
     required TResult Function(String accountName) unknownAccount,
     required TResult Function(int code, String message, Object? data) rpcError,
-    required TResult Function(String? reason) other,
+    required TResult Function(int? code, Object? data, String? message) other,
   }) {
     return rpcError(code, message, data);
   }
@@ -2070,7 +2070,7 @@ class _$TransactionRPCErrorImpl extends _TransactionRPCError {
     TResult? Function()? userRejected,
     TResult? Function(String accountName)? unknownAccount,
     TResult? Function(int code, String message, Object? data)? rpcError,
-    TResult? Function(String? reason)? other,
+    TResult? Function(int? code, Object? data, String? message)? other,
   }) {
     return rpcError?.call(code, message, data);
   }
@@ -2089,7 +2089,7 @@ class _$TransactionRPCErrorImpl extends _TransactionRPCError {
     TResult Function()? userRejected,
     TResult Function(String accountName)? unknownAccount,
     TResult Function(int code, String message, Object? data)? rpcError,
-    TResult Function(String? reason)? other,
+    TResult Function(int? code, Object? data, String? message)? other,
     required TResult orElse(),
   }) {
     if (rpcError != null) {
@@ -2193,7 +2193,7 @@ abstract class _$$TransactionOtherErrorImplCopyWith<$Res> {
           $Res Function(_$TransactionOtherErrorImpl) then) =
       __$$TransactionOtherErrorImplCopyWithImpl<$Res>;
   @useResult
-  $Res call({String? reason});
+  $Res call({int? code, Object? data, String? message});
 }
 
 /// @nodoc
@@ -2207,12 +2207,19 @@ class __$$TransactionOtherErrorImplCopyWithImpl<$Res>
   @pragma('vm:prefer-inline')
   @override
   $Res call({
-    Object? reason = freezed,
+    Object? code = freezed,
+    Object? data = freezed,
+    Object? message = freezed,
   }) {
     return _then(_$TransactionOtherErrorImpl(
-      reason: freezed == reason
-          ? _value.reason
-          : reason // ignore: cast_nullable_to_non_nullable
+      code: freezed == code
+          ? _value.code
+          : code // ignore: cast_nullable_to_non_nullable
+              as int?,
+      data: freezed == data ? _value.data : data,
+      message: freezed == message
+          ? _value.message
+          : message // ignore: cast_nullable_to_non_nullable
               as String?,
     ));
   }
@@ -2221,14 +2228,19 @@ class __$$TransactionOtherErrorImplCopyWithImpl<$Res>
 /// @nodoc
 
 class _$TransactionOtherErrorImpl extends _TransactionOtherError {
-  const _$TransactionOtherErrorImpl({this.reason}) : super._();
+  const _$TransactionOtherErrorImpl({this.code, this.data, this.message})
+      : super._();
 
   @override
-  final String? reason;
+  final int? code;
+  @override
+  final Object? data;
+  @override
+  final String? message;
 
   @override
   String toString() {
-    return 'TransactionError.other(reason: $reason)';
+    return 'TransactionError.other(code: $code, data: $data, message: $message)';
   }
 
   @override
@@ -2236,11 +2248,14 @@ class _$TransactionOtherErrorImpl extends _TransactionOtherError {
     return identical(this, other) ||
         (other.runtimeType == runtimeType &&
             other is _$TransactionOtherErrorImpl &&
-            (identical(other.reason, reason) || other.reason == reason));
+            (identical(other.code, code) || other.code == code) &&
+            const DeepCollectionEquality().equals(other.data, data) &&
+            (identical(other.message, message) || other.message == message));
   }
 
   @override
-  int get hashCode => Object.hash(runtimeType, reason);
+  int get hashCode => Object.hash(
+      runtimeType, code, const DeepCollectionEquality().hash(data), message);
 
   @JsonKey(ignore: true)
   @override
@@ -2263,9 +2278,9 @@ class _$TransactionOtherErrorImpl extends _TransactionOtherError {
     required TResult Function() userRejected,
     required TResult Function(String accountName) unknownAccount,
     required TResult Function(int code, String message, Object? data) rpcError,
-    required TResult Function(String? reason) other,
+    required TResult Function(int? code, Object? data, String? message) other,
   }) {
-    return other(reason);
+    return other(code, data, message);
   }
 
   @override
@@ -2282,9 +2297,9 @@ class _$TransactionOtherErrorImpl extends _TransactionOtherError {
     TResult? Function()? userRejected,
     TResult? Function(String accountName)? unknownAccount,
     TResult? Function(int code, String message, Object? data)? rpcError,
-    TResult? Function(String? reason)? other,
+    TResult? Function(int? code, Object? data, String? message)? other,
   }) {
-    return other?.call(reason);
+    return other?.call(code, data, message);
   }
 
   @override
@@ -2301,11 +2316,11 @@ class _$TransactionOtherErrorImpl extends _TransactionOtherError {
     TResult Function()? userRejected,
     TResult Function(String accountName)? unknownAccount,
     TResult Function(int code, String message, Object? data)? rpcError,
-    TResult Function(String? reason)? other,
+    TResult Function(int? code, Object? data, String? message)? other,
     required TResult orElse(),
   }) {
     if (other != null) {
-      return other(reason);
+      return other(code, data, message);
     }
     return orElse();
   }
@@ -2384,11 +2399,15 @@ class _$TransactionOtherErrorImpl extends _TransactionOtherError {
 }
 
 abstract class _TransactionOtherError extends TransactionError {
-  const factory _TransactionOtherError({final String? reason}) =
-      _$TransactionOtherErrorImpl;
+  const factory _TransactionOtherError(
+      {final int? code,
+      final Object? data,
+      final String? message}) = _$TransactionOtherErrorImpl;
   const _TransactionOtherError._() : super._();
 
-  String? get reason;
+  int? get code;
+  Object? get data;
+  String? get message;
   @JsonKey(ignore: true)
   _$$TransactionOtherErrorImplCopyWith<_$TransactionOtherErrorImpl>
       get copyWith => throw _privateConstructorUsedError;
diff --git a/lib/src/utils/transaction_error_util.dart b/lib/src/utils/transaction_error_util.dart
new file mode 100644
index 0000000..e199cda
--- /dev/null
+++ b/lib/src/utils/transaction_error_util.dart
@@ -0,0 +1,23 @@
+/// SPDX-License-Identifier: AGPL-3.0-or-later
+
+String extractTransactionErrorMessages(Map<String, dynamic> json) {
+  final messageBuffer = StringBuffer();
+
+  void extractMessages(Map<String, dynamic> map) {
+    map.forEach((key, value) {
+      if (key == 'message') {
+        messageBuffer.write(' - ');
+        messageBuffer.write(value);
+        if (value is Map<String, dynamic>) {
+          extractMessages(value);
+        }
+      } else if (value is Map<String, dynamic>) {
+        extractMessages(value);
+      }
+    });
+  }
+
+  extractMessages(json);
+
+  return messageBuffer.toString();
+}
diff --git a/pubspec.yaml b/pubspec.yaml
index 09f17dd..09f827e 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -3,7 +3,7 @@ name: archethic_lib_dart
 description: Archethic dart library for Flutter for Node and Browser. This library aims to provide a easy way to create Archethic transaction and to send them over the network
 homepage: https://github.com/archethic-foundation/libdart
 
-version: 3.3.18
+version: 3.4.0
 
 environment:
   sdk: ">=3.3.0 <4.0.0"