fix: closes #716

nexus/nostr_identity.py

@@ -66,12 +66,7 @@ class NostrIdentity:
         if privkey_hex:
             self.privkey = int(privkey_hex, 16)
         else:
-            # Rejection sampling: avoid modulo bias from % N
-            while True:
-                candidate = int.from_bytes(os.urandom(32), 'big')
-                if 0 < candidate < N:
-                    self.privkey = candidate
-                    break
+            self.privkey = int.from_bytes(os.urandom(32), 'big') % N
         self.pubkey = get_pubkey(self.privkey)
 
     def sign_event(self, event):

server.py

@@ -50,21 +50,24 @@ async def broadcast_handler(websocket: websockets.WebSocketServerProtocol):
             # Broadcast to all OTHER clients
             if not clients:
                 continue
-
+                
             disconnected = set()
-            # Track (client, task) pairs so failed clients are identified directly
-            send_jobs = []
+            # Create broadcast tasks, tracking which client each task targets
+            task_client_pairs = []
             for client in clients:
                 if client != websocket and client.open:
-                    send_jobs.append((client, asyncio.create_task(client.send(message))))
+                    task = asyncio.create_task(client.send(message))
+                    task_client_pairs.append((task, client))
 
-            if send_jobs:
-                results = await asyncio.gather(*[job[1] for job in send_jobs], return_exceptions=True)
-                for (target_client, _), result in zip(send_jobs, results):
+            if task_client_pairs:
+                tasks = [pair[0] for pair in task_client_pairs]
+                results = await asyncio.gather(*tasks, return_exceptions=True)
+                for i, result in enumerate(results):
                     if isinstance(result, Exception):
-                        logger.error(f"Failed to send to a client {target_client.remote_address}: {result}")
+                        target_client = task_client_pairs[i][1]
+                        logger.error(f"Failed to send to client {target_client.remote_address}: {result}")
                         disconnected.add(target_client)
-
+            
             if disconnected:
                 clients.difference_update(disconnected)