@csolisr @maegul @atomicpoet @markrprior It’s a difficult problem. It’s one Bluesky claim they know how to do, but absolutely do not when you check into it. CalcKey is close to having a minimally functional version, with some of the problems I discuss in this post
https://metalsamurai.wordpress.com/2023/03/26/more-on-mastodon-and-portable-identities/
(They tried it and turned it off when they hit the timeline spamming problem I talk about in the post)