- com.hsinyau.guestbook.entry record A signed guestbook entry left on another actor's guestbook marker. The entry record lives on the author's own PDS; the marker it references is owned by the site operator.
- com.hsinyau.guestbook.marker record A marker record identifying a surface (a website, profile, project) that accepts com.hsinyau.guestbook.entry records. The marker lives on the operator's own PDS; entries reference it by AT-URI. Using `self` as the rkey means a single canonical guestbook per actor.