diff --git a/packages/system/src/event-ext.ts b/packages/system/src/event-ext.ts
index f2727147..575c5d53 100644
--- a/packages/system/src/event-ext.ts
+++ b/packages/system/src/event-ext.ts
@@ -59,6 +59,7 @@ export abstract class EventExt {
    * @returns True if valid signature
    */
   static verify(e: NostrEvent) {
+    if ((e.sig?.length ?? 0) < 64) return false;
     const id = this.createId(e);
     const result = secp.schnorr.verify(e.sig, id, e.pubkey);
     return result;
@@ -175,6 +176,6 @@ export abstract class EventExt {
     if (type === EventType.ParameterizedReplaceable) {
       if (!findTag(ev, "d")) return false;
     }
-    return true;
+    return EventExt.verify(ev);
   }
 }
diff --git a/packages/system/src/nostr-system.ts b/packages/system/src/nostr-system.ts
index 28333822..e741b3aa 100644
--- a/packages/system/src/nostr-system.ts
+++ b/packages/system/src/nostr-system.ts
@@ -179,7 +179,10 @@ export class NostrSystem extends ExternalStore<SystemSnapshot> implements System
   }
 
   #onEvent(sub: string, ev: TaggedNostrEvent) {
-    if (!EventExt.isValid(ev)) return;
+    if (!EventExt.isValid(ev)) {
+      this.#log("Rejecting invalid event %O", ev);
+      return;
+    }
 
     for (const [, v] of this.Queries) {
       v.handleEvent(sub, ev);