Yes I think we should have an event kind that allows somebody to cryptographically bind an IP address and port (SocketAddr) to a relay's keypair. But we would need: 1) Relays to have keypairs 2) Nostr to reference relays by keypair instead of by url 3) A means of distributing the binding event (because of the chicken-and-egg problem) maybe just blast them, or maybe a DHT. It's a great idea for nostr2, so nostr2 won't be dependent on DNS and shoudn't need to be dependent on SSL certificates issued by CAs that nobody really trusts anyways.