It is pretty cool seeing all the entries fly by in my web server logs with IP addresses from all over the world accessing the nostr.json file to verify my Nostr profile. We've long had verification of public keys like this (tied to a known owned domain name), but it is cool to see it now so tightly integrated with a social media protocol like Nostr.
Discussion
I imagine in the future you could have signature validation for code signing purposes tied to Nostr identities. So rather than utilizing third-party key servers, you could go straight to the user's Nostr profile for verification.
Though I suppose that would require signing code with the same private key used for Nostr.
**thinking out loud**
The social verification of keys on Nostr is just so strong because of all the interconnected relationships built on here. It is basically akin to meeting someone face to face and them telling you that, "yup, this is definitely my public key." Much strong validation integrated right into social media than I'd say we've ever had before.