diff --git a/DysonNetwork.Sphere/ActivityPub/ActivityPubSignatureService.cs b/DysonNetwork.Sphere/ActivityPub/ActivityPubSignatureService.cs
index 6f40e61..f2549e1 100644
--- a/DysonNetwork.Sphere/ActivityPub/ActivityPubSignatureService.cs
+++ b/DysonNetwork.Sphere/ActivityPub/ActivityPubSignatureService.cs
@@ -45,6 +45,7 @@ public class ActivityPubSignatureService(
                 string.Join(", ", signatureParts.Select(kvp => $"{kvp.Key}={kvp.Value}")));
             return false;
         }
+        actorUri = actorUri.Split('#')[0];
         
         logger.LogInformation("Verifying signature for actor: {ActorUri}", actorUri);