For the clients that show web of trust statistics. I think it was on coracle that it has a little circle with a number next to names. I got a message from nostr:npub1a2cww4kn9wqte4ry70vyfwqyqvpswksna27rtxd8vty6c74era8sdcw83a but noticed the circle had a -3 in it and in less than a second I knew it was an impersonator.

(Negative 3 means no one I know is following this person, and 3 people I know have muted this person)

I’m honestly shocked this isn’t a standard for every client. It’s one of the simplest and lowest barrier ways to deal with spam that I know of, that’s uniquely available in #nostr