Change of domain owner
Owner, or domain holder, is shown on central registry of domains. At most TLDs this information is public and can be found in so called WHOIS database.
WHOIS database are provided by individual central registrars and information, which are in WHOIS can be different at different TLDs.
Provided, however, that the domain owner is the person or company listed on the central domain registry - it doesn't necessary means the owner of user account, where the domain is listed or it's payer.