Couldn't we put the onion address on the site, signed by the site/publishers key? Ignoring key exchange methods for a moment, once you have a key for "Bob the B

Couldn't we put the onion address on the site, signed by the site/publishers key? Ignoring key exchange methods for a moment, once you have a key for "Bob the Blogger" you can verify Bob says the address is X and your url is X, so this is Bob's site.