localist on Nostr: Well, there are easy ways that cost Sats (and occasionally privacy) online, ...

Well, there are easy ways that cost Sats (and occasionally privacy) online, these’ll likely be the top hits from Googling.

If you want to go the free route, however, this is an excellent guide:

https://orangepill.dev/nostr-guides/guide-to-verify-nostr-profile-nip05-identifier-with-your-domain/