diff --git a/src/nostr/client.py b/src/nostr/client.py
index eccb088..cfa3e3f 100644
--- a/src/nostr/client.py
+++ b/src/nostr/client.py
@@ -8,6 +8,7 @@ from typing import List, Optional, Tuple, TYPE_CHECKING
 import hashlib
 import asyncio
 import gzip
+import threading
 import websockets
 
 # Imports from the nostr-sdk library
@@ -138,6 +139,7 @@ class NostrClient:
         self.last_error: Optional[str] = None
 
         self.delta_threshold = 100
+        self._state_lock = threading.Lock()
         self.current_manifest: Manifest | None = None
         self.current_manifest_id: str | None = None
         self._delta_events: list[str] = []
@@ -399,11 +401,12 @@ class NostrClient:
             .sign_with_keys(self.keys)
         )
         await self.client.send_event(manifest_event)
-        self.current_manifest = manifest
-        self.current_manifest_id = manifest_identifier
-        # Record when this snapshot was published for future delta events
-        self.current_manifest.delta_since = int(time.time())
-        self._delta_events = []
+        with self._state_lock:
+            self.current_manifest = manifest
+            self.current_manifest_id = manifest_identifier
+            # Record when this snapshot was published for future delta events
+            self.current_manifest.delta_since = int(time.time())
+            self._delta_events = []
         if getattr(self, "verbose_timing", False):
             duration = time.perf_counter() - start
             logger.info("publish_snapshot completed in %.2f seconds", duration)
@@ -486,8 +489,9 @@ class NostrClient:
                     ident = tag[1]
                 elif isinstance(tag, str):
                     ident = tag
-        self.current_manifest = manifest
-        self.current_manifest_id = ident
+        with self._state_lock:
+            self.current_manifest = manifest
+            self.current_manifest_id = ident
         return manifest, chunks
 
     async def fetch_latest_snapshot(self) -> Tuple[Manifest, list[bytes]] | None:
@@ -551,23 +555,27 @@ class NostrClient:
         if hasattr(created_at, "secs"):
             created_at = created_at.secs
         if self.current_manifest is not None:
-            self.current_manifest.delta_since = int(created_at)
-            manifest_json = json.dumps(
-                {
-                    "ver": self.current_manifest.ver,
-                    "algo": self.current_manifest.algo,
-                    "chunks": [meta.__dict__ for meta in self.current_manifest.chunks],
-                    "delta_since": self.current_manifest.delta_since,
-                }
-            )
-            manifest_event = (
-                EventBuilder(Kind(KIND_MANIFEST), manifest_json)
-                .tags([Tag.identifier(self.current_manifest_id)])
-                .build(self.keys.public_key())
-                .sign_with_keys(self.keys)
-            )
+            with self._state_lock:
+                self.current_manifest.delta_since = int(created_at)
+                manifest_json = json.dumps(
+                    {
+                        "ver": self.current_manifest.ver,
+                        "algo": self.current_manifest.algo,
+                        "chunks": [
+                            meta.__dict__ for meta in self.current_manifest.chunks
+                        ],
+                        "delta_since": self.current_manifest.delta_since,
+                    }
+                )
+                manifest_event = (
+                    EventBuilder(Kind(KIND_MANIFEST), manifest_json)
+                    .tags([Tag.identifier(self.current_manifest_id)])
+                    .build(self.keys.public_key())
+                    .sign_with_keys(self.keys)
+                )
             await self.client.send_event(manifest_event)
-        self._delta_events.append(delta_id)
+        with self._state_lock:
+            self._delta_events.append(delta_id)
         return delta_id
 
     async def fetch_deltas_since(self, version: int) -> list[bytes]:
@@ -609,6 +617,21 @@ class NostrClient:
                     await self.client.send_event(exp_event)
         return deltas
 
+    def get_current_manifest(self) -> Manifest | None:
+        """Thread-safe access to ``current_manifest``."""
+        with self._state_lock:
+            return self.current_manifest
+
+    def get_current_manifest_id(self) -> str | None:
+        """Thread-safe access to ``current_manifest_id``."""
+        with self._state_lock:
+            return self.current_manifest_id
+
+    def get_delta_events(self) -> list[str]:
+        """Thread-safe snapshot of pending delta event IDs."""
+        with self._state_lock:
+            return list(self._delta_events)
+
     def close_client_pool(self) -> None:
         """Disconnects the client from all relays."""
         try:
diff --git a/src/seedpass/core/manager.py b/src/seedpass/core/manager.py
index bf44ba7..d1cf5f3 100644
--- a/src/seedpass/core/manager.py
+++ b/src/seedpass/core/manager.py
@@ -3669,7 +3669,7 @@ class PasswordManager:
             chunk_ids: list[str] = []
             if manifest is not None:
                 chunk_ids = [c.event_id for c in manifest.chunks if c.event_id]
-            delta_ids = getattr(self.nostr_client, "_delta_events", [])
+            delta_ids = self.nostr_client.get_delta_events()
             return {
                 "manifest_id": event_id,
                 "chunk_ids": chunk_ids,
@@ -4121,13 +4121,11 @@ class PasswordManager:
         )
 
         # Nostr sync info
-        manifest = getattr(self.nostr_client, "current_manifest", None)
+        manifest = self.nostr_client.get_current_manifest()
         if manifest is not None:
             stats["chunk_count"] = len(manifest.chunks)
             stats["delta_since"] = manifest.delta_since
-            stats["pending_deltas"] = len(
-                getattr(self.nostr_client, "_delta_events", [])
-            )
+            stats["pending_deltas"] = len(self.nostr_client.get_delta_events())
         else:
             stats["chunk_count"] = 0
             stats["delta_since"] = None