As past participles of get, got and gotten both date back to Middle English. The form gotten is not used in British English but is very common in North American English, though even there it is often regarded as non-standard. In North American English, got and gotten are not identical in use. Gotten usually implies the process of obtaining something, as in he had gotten us tickets for the show, while got implies the state of possession or ownership, as in I haven't got any money.