You mean like nostr:nprofile1qqsrx4k7vxeev3unrn5ty9qt9w4cxlsgzrqw752mh6fduqjgqs9chhgpzamhxue69uhhyetvv9ujuurjd9kkzmpwdejhgtcpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhszyrhwden5te0dehhxarj9ekk7mf0mpwca6 's Spring app?
Check out https://github.com/oren-z0/noteguardian-extension it uses WebRTC to connect your computer's browser extension with your phone over local WiFi.
In the current implementation the phone opens a webpage (which may be opened with Spring) to do the signing - but it could be Damus.
#NoteGuardian