diff --git a/lib/widgets/chat_message.dart b/lib/widgets/chat_message.dart
index fe7bb29..4c5e992 100644
--- a/lib/widgets/chat_message.dart
+++ b/lib/widgets/chat_message.dart
@@ -30,7 +30,7 @@ class ChatMessage extends StatelessWidget {
 
   const ChatMessage({Key? key, required this.fgid, required this.name, required this.message, this.avatar}): super(key: key);
 
-  Widget _showContactCard(Widget avatar, String gid, String name, String title, ColorScheme color) {
+  Widget _showContactCard(Widget avatar, String gid, String name, String title, ColorScheme color, [String pre='EH']) {
     return Container(
       padding: const EdgeInsets.only(top: 10, bottom: 6.0, left: 10.0, right: 10.0),
       width: 200.0,
@@ -43,7 +43,7 @@ class ChatMessage extends StatelessWidget {
                 child: Column(children: [
                     Text(name, maxLines: 1, overflow: TextOverflow.ellipsis, style: TextStyle(color: color.onPrimary, fontSize: 16.0)),
                     const SizedBox(height: 4.0),
-                    Text(gidPrint(gid), style: TextStyle(color: Colors.grey, fontSize: 12.0)),
+                    Text(gidPrint(gid, pre), style: TextStyle(color: Colors.grey, fontSize: 12.0)),
           ]))]),
           const SizedBox(height: 5.0),
           const Divider(height: 1.0, color: Color(0x40ADB0BB)),
@@ -247,14 +247,13 @@ class ChatMessage extends StatelessWidget {
     // contact [type, gid, addr, name, proof, key]
     final infos = message.showInvite();
     if (infos[1].length > 0) {
-      final gid = 'EG' + infos[1].toUpperCase();
       final GroupType gtype = infos[0];
       return GestureDetector(
         onTap: () => showShadowDialog(
           context,
           Icons.groups_rounded,
           lang.groupChat,
-          UserInfo(showQr: false, id: gid, addr: '0x' + infos[2], name: infos[3],
+          UserInfo(showQr: false, id: infos[1], addr: infos[2], name: infos[3], pre: 'EG',
             title: gtype.lang(lang),
             avatar: Container(width: 100.0, height: 100.0,
               padding: const EdgeInsets.all(8.0),
@@ -274,7 +273,7 @@ class ChatMessage extends StatelessWidget {
             decoration: BoxDecoration(color: color.surface, borderRadius: BorderRadius.circular(10.0)),
             child: Icon(Icons.groups_rounded, color: color.primary, size: 20.0),
           ),
-          gid, infos[3], lang.groupChat, color)
+          infos[1], infos[3], lang.groupChat, color, 'EG')
       );
     } else {
       return _showText(context, color, maxWidth);