"Gotten", in AmE, is the regular past participle. "Got", however, survives in "have got" as a strong form of "have". "I have gotten several complaints about you" introduces other people's complaints; "I have got several complaints about you" introduces my own complaints.

"Proved" is the regular English past participle. "Proven" originally belonged to the Scottish "preve" (prove, proven), but because of the familiarity of the Scottish verdict "not proven", it has wormed its way into English & American English.