In nos.social we look at user look up / search and if it looks like a fediverse address we find the nip-05 from mostr and let users follow the fediverse account. It is under documented but works well.

GitHub

nos/Nos/Service/RelayService.swift at a1d75348703851e4f5a51ca3ac21c26ef61882e3 · planetary-social/nos

nos.social social media for all of us, using nostr - planetary-social/nos