http://rzuwtppveur6yh3n2in7trmddgrkuhww4eb2znykgjwubihfpljiyuid.onion
Even if your torrent application connects only through Tor, you will often send out your real IP address in the tracker GET request, because that's how torrents work.
Not only do you deanonymize your torrent traffic and your other simultaneous Tor web traffic this way, you also slow down the entire Tor network for everyone else.