It's been less than a month since many feared the BitTorrent world would collapse due to a $7.8m investment in The Pirate Bay. Since then OpenBitTorrent has come along to largely take its place, backed up by PublicBT to spread the load. Now comes Hidden Tracker, a brand new public tracker which hides itself using TOR.
BitTorrent Hydra: Anonymous Hidden Tracker Via Tor | TorrentFreak

They aren't the first to come up with this idea - anoNet has a tracker, too. The difference would be that this one hosts alive torrents, lol.