http://i3xi5qxvbrngh3g6o7czwjfxwjzigook7zxzjmgwg5b7xnjcn5hzciad.onion/print.html
This is called responder anonymity ,
and the mechanism Tor uses to achieve it
is called onion services (or “hidden services” or “rendezvous services”
in some older documentation). For the details on onion services,
see the Tor Rendezvous Specification .