I am guessing you mean nsec, as with npub only an app cannot modify your contact list

https://github.com/nostrability/nostrability/issues/75

nostr:npub1unmftuzmkpdjxyj4en8r63cm34uuvjn9hnxqz3nz6fls7l5jzzfqtvd0j2 ser https://image.nostr.build/893e334895a9cb449eb43690f0fabd17566c396bcaac18169ed96ba671f3c1ab.jpg