diff --git a/SVSimLoader/IdentityWipe.cs b/SVSimLoader/IdentityWipe.cs
index 82a3752..92d8baf 100644
--- a/SVSimLoader/IdentityWipe.cs
+++ b/SVSimLoader/IdentityWipe.cs
@@ -1,14 +1,45 @@
 extern alias game;
 
+using ObscuredPrefs = CodeStage.AntiCheat.ObscuredTypes.ObscuredPrefs;
 using PlayerPrefs = game::UnityEngine.PlayerPrefs;
 
 namespace SVSimLoader;
 
+/// <summary>
+/// Narrow identity reset for the local-server test loop. Deletes ONLY the three
+/// account-keyed entries in <c>Toolbox.SavedataManager</c>:
+/// <list type="bullet">
+///   <item>UDID — client-generated GUID identifying this install</item>
+///   <item>VIEWER_ID — server-assigned viewer id</item>
+///   <item>SHORT_UDID — server-assigned short id</item>
+/// </list>
+/// <para>
+/// Calling <c>PlayerPrefs.DeleteAll()</c> would also wipe RES_VER (the asset manifest
+/// version that drives the Akamai CDN path), language/sound prefs, and — most importantly
+/// for the local-server loop — whatever cache-index metadata the asset layer stores in
+/// PlayerPrefs. That made every nuked launch trigger the 15.8 MB tutorial-asset download
+/// prompt followed by the 497 MB background-download prompt, even when the on-disk asset
+/// bundles were already there. Narrowing to the three identity keys keeps the asset cache
+/// in sync with what prod last served, so a wiped client behaves like a fresh signup
+/// against the same RES_VER prod is currently on.
+/// </para>
+/// <para>
+/// <c>ObscuredPrefs.DeleteKey</c> deletes both the obscured-key entry
+/// (<c>PlayerPrefs[EncryptKey("UDID")]</c>) and the plain-key entry
+/// (<c>PlayerPrefs["UDID"]</c>) for each key, matching how
+/// <c>Cute/Certification.InitializeFileds</c> would clear them in the game itself.
+/// </para>
+/// </summary>
 public static class IdentityWipe
 {
+    private static readonly string[] IdentityKeys = { "UDID", "VIEWER_ID", "SHORT_UDID" };
+
     public static void Execute()
     {
-        PlayerPrefs.DeleteAll();
+        foreach (var key in IdentityKeys)
+        {
+            ObscuredPrefs.DeleteKey(key);
+        }
         PlayerPrefs.Save();
     }
 }