diff --git a/docs/nostr-auth.md b/docs/nostr-auth.md
index 986e7031..c29bdcd5 100644
--- a/docs/nostr-auth.md
+++ b/docs/nostr-auth.md
@@ -59,16 +59,6 @@ When introducing additional providers, choose a unique string value and extend t
 When the app reads stored entries it normalises unknown values back to
 `"nip07"` but keeps recognised alternatives intact.
 
-## Migration notes
+## Supported Auth Cache
 
-Earlier builds only persisted a single `userPubKey` string. During startup the
-app now:
-
-1. Attempts to read `bitvid:savedProfiles:v1` and validate the payload.
-2. If the key is missing (or malformed) but a legacy `userPubKey` entry exists,
-   it seeds `savedProfiles` with that value and writes the new structure.
-3. Once the JSON payload is written successfully, the legacy `userPubKey` entry
-   is removed.
-
-Future migrations should follow the same pattern: validate, normalise, write the
-new format, then clean up legacy keys to avoid data loss.
+`bitvid:savedProfiles:v1` is the sole supported auth cache. Legacy keys such as `userPubKey` are no longer read or migrated.
diff --git a/tests/state/cache-saved-profiles.test.mjs b/tests/state/cache-saved-profiles.test.mjs
index 29c935d3..0866f888 100644
--- a/tests/state/cache-saved-profiles.test.mjs
+++ b/tests/state/cache-saved-profiles.test.mjs
@@ -1,3 +1,4 @@
+import "../test-helpers/setup-localstorage.mjs";
 import test from "node:test";
 import assert from "node:assert/strict";
 
@@ -149,3 +150,14 @@ test("loadSavedProfilesFromStorage trims stored authType values", () => {
   assert.equal(stored.entries[0].authType, "extension-provider");
   assert.equal(stored.entries[0].providerId, "extension-provider");
 });
+
+test("loadSavedProfilesFromStorage ignores legacy userPubKey", () => {
+  resetSavedProfilesState();
+
+  localStorage.setItem("userPubKey", SAMPLE_PUBKEY);
+  // Ensure the modern key is missing/empty
+  localStorage.removeItem(STORAGE_KEY);
+
+  const { profiles } = loadSavedProfilesFromStorage();
+  assert.equal(profiles.length, 0, "Expected no profiles to be loaded from legacy key");
+});