doesn't that only work for sites the link creator has control of? i don't see how the technique can be used with links a search engine finds and then gives out to anon users.
1. The search engine adds itself to the tracker list in the magnet URI (&tr= query parameters), but with a unique subdomain and using HTTP (i.e. it adds http://asdfkja.skytorrent.in/announce to the tracker list)
2. The client announces itself to the tracker, sending the unique "Host" in the GET request (asdfkja.skytorrent.in in the example).
