Yes! I like nosdav! Would love to understand it better and self host a server, can be interesting, lately i was thinking that this kind of solutions can work as a coordinator to allow users communicate in a more private way. Nosdav can work as a totp server true?
Btw what do you think about nostrcheck-api? Its the backend used in nostrcheck.me that its open source now, it uses nip 98 for auth too. It have the same direction of a nosdav server