Fix: don't emit a profile that is only a created_at

The created_at was added to the profile object before the non-empty check, so a
kind-0 with only alsoKnownAs produced doc.profile = {created_at}. Attach
created_at only when the kind-0 contributes real profile fields; alsoKnownAs-only
kind-0 now yields no profile but still counts toward modified (prior commit's
gate). Fixes the test added in fcc3382.

Author: melvincarvalho

src/diddoc.js

@@ -58,8 +58,12 @@ export function buildDidDocument(pubkey, { profile, follows, relays } = {}) {
       const p = {};
       for (const k of ['name', 'about', 'picture', 'website', 'nip05', 'lud16']) if (c[k]) p[k] = c[k];
       if (c.display_name && !p.name) p.name = c.display_name;
-      if (Number.isSafeInteger(profile.created_at)) p.created_at = profile.created_at;
-      if (Object.keys(p).length) doc.profile = p;
+      // created_at is provenance *for the profile*: attach it only when the kind-0
+      // actually contributes profile fields (not a bare timestamp object).
+      if (Object.keys(p).length) {
+        if (Number.isSafeInteger(profile.created_at)) p.created_at = profile.created_at;
+        doc.profile = p;
+      }
       if (Array.isArray(c.alsoKnownAs) && c.alsoKnownAs.length) doc.alsoKnownAs = c.alsoKnownAs;
     } catch { /* malformed kind-0 content */ }
   }