yeah, that’s doable, I would do it like this: DIDs could just be cryptographic signing keys, and your client could just sign all your posts, and send it to any server, which will federate that. same with the upvotes/downvotes(timestamps will have to be signed so a server could not just replay an upvote or downvote if you change your mind) in this case, servers will only be useful for naming(and keeping the bio and public signing key) and relaying the messages to other servers.