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 You can host a website or some other low-bandwith service and make it reachable with an npub instead of an IP or DNS.  
 So a device on a network can be found through an npub instead of an IP? 

What’s the difference? Isn’t an IP just an arbitrary number anyway?

I still don’t think I understand the benefit. Especially since the goal of a key pair is to sign things with the secret key. Are these devices signing data they transmit? 
 So this is basically Tor over nostr right?
But I still don't understand because relays can see the IP in this case only the NWS would than?

nostr:note1rs5ey6vmvxtvtrrfa9uwm8m8ywfmpfq5hlngfnr9a6l4fdv746pshnmlfy

https://m.primal.net/JVMt.png