Here's the NIP 5 method:
Hey nostr:npub1yxzkmtuyctjw2pffp6e9uvyrkp29hrqra2tm3xp3z9707z06muxsg75qvv how can I verify that you're really you? Do you have your npub posted somewhere on a website? I kind of looked at craphound and pluralistic.
Discussion
You just need to add a .well-known/nostr.json to either your craphound or pluralistic