In 1928 Walt Disney found out his star character belonged to his distributor. In 2006 Disney got it back, as part of letting a sportscaster go. Check whose name the things your business runs on are in.
The public registration record (RDAP): who it's registered through, when it expires, whether it's locked, where its DNS lives.
Honest limit: most domains hide the owner behind a privacy service, so no public lookup can prove a domain is in your name. The proof is the registrar account itself: who logs in, and whose email gets the renewal notices.
Tick each one only after you've logged in and seen your business (or you) as the owner. It stays on this device.