diff --git a/app/signalbot/rpc.py b/app/signalbot/rpc.py
index 4962b44..91ad5f9 100644
--- a/app/signalbot/rpc.py
+++ b/app/signalbot/rpc.py
@@ -1,11 +1,12 @@
 import json
+import logging
 import subprocess
 
 import requests
 
 from django.conf import settings
 
-
+logger = logging.getLogger(__name__)
 rpc_id = 1
 
 
@@ -35,6 +36,7 @@ def send(msg, to=None, group=None, preview_url=None, preview_title=None, preview
     }
     if group:
         params["groupId"] = group
+        verifyGroupMembers(group)
     else:
         params["recipient"] = to
     if preview_url:
@@ -60,3 +62,19 @@ def send_reaction(target_address, target_ts, emoji, to=None, group=None, remove=
         params["recipient"] = to
 
     return api("sendReaction", params)
+
+
+def verifyGroupMembers(group_id):
+    for group in api("listGroups", {})
+        if group["id"] == group_id:
+            for member in group["members"]:
+                if member["number"] != settings.SIGNAL_ACCOUNT:
+                    for detail in api("listIdentities", {
+                        "number": member["number"]
+                    }):
+                        if detail['trustLevel'] != 'TRUSTED_VERIFIED':
+                            logger.error("%s verification numbers changed (accepting new numbers)", member["number"])
+                            r = api("trust", {
+                                "recipient": member["number"],
+                                "verifiedSafetyNumber": detail['fingerprint'],
+                            })