otdistu on Nostr: You will see "0 followers" and "0 following" on his page, click any of those. In the ...

You will see "0 followers" and "0 following" on his page, click any of those. In the address bar, you will see a string of numbers and letters starting with npup - his public key. Copy it, add @ at the beginning and you can tag him in posts. Fetching his profile requires him interacting with the post on the other side though