I’m not sure what door it is, but there’s exploration happening: http://github.com/bluesky-social/atproto/pull/3620
Imagine that but with the FROST key signing / bunker…
Letting bsky users have a hosted nsec bunker using their PDS. They’re already ok with the server holding their keys. Think of it it as custodial nostr vs non-custodial. Sure the latter is better if you want real security and control, but a lot of folks don’t want or wouldnt manage well self custody. In fact they don’t even have to know.