this post was submitted on 09 Jun 2023
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Since we're a decentralized federated network, it would stand to reason that the SSO implementation would also be so. Maybe something built on top of DHT shared by every instance, which just stores user key hashes to verify they are who they say they are. That way there would be no issue with central authentication authority and all instances will go by the hash table for user auth.
Quick check and here's what mastodon has been doing on the issue https://github.com/mastodon/mastodon/pull/16221