I didn’t consider account recovery, that’s a good point. Personally I don’t usually bother with it for anything I want to be private - if I lose it I lose it lol.
It’s still not perfect, but some of the private email hosting providers like proton have email aliases, so you could use one for recovery without giving any info to hackers (assuming you trust the email provider). Definitely less secure than only a public key being exposed, but maybe an acceptable tradeoff for the convenience of an existing established solution?
You rule out social networks, but why? Wouldn’t a fediverse microblogging (or full blogging) platform work fine for the purpose? Just pick an irrelevant username and a strong+unique password and only access your account through tor using any and all relevant best practices.
Given you want the continuity of the author preserved, I don’t see the functional difference between the posts being associated with an anonymous account and them all having your public key. Am I missing something?
It physically hurts me to say anything in facebook’s defence, but to be fair this is an account centre link to an account config page