here we use nip 05 to connect domains to our profiles as a unique identifier… which will earn you a check. The more notable your url the more verification it provides. 

Here is the official nip (nostr implementation possibility)
https://github.com/nostr-protocol/nips/blob/master/05.md

and a guide on how to set it up yourself
https://orangepill.dev/nostr-guides/guide-to-verify-nostr-profile-nip05-identifier-with-your-domain/

There are also services like https://nostr.directory and https://nostrplebs.com that offer simpler methods of obtaining an identifier. #[6] #[7]