This year, the IndieWeb community has been making progress on iterating and evolving the IndieAuth protocol. IndieAuth is an extension of OAuth 2.0 that enables it to work with personal websites and in a decentralized environment.
I'll be hanging out at ActivityPub Conf this weekend, starting with my live Q&A session tomorrow! I'm always happy to chat about all things OAuth and authentication! Check out my recorded talk ahead of time, and join the discussion on the forum!