YouHaveDownloaded.com is a new online demo of what kind of information you easily leave on the internet while downloading torrent files.
The service would compare your IP to their database and show you the recently downloaded files from the bittorrent network.
There is a good chance that it would be able to showcase any recently downloaded torrent file if you are not on a dynamic IP.
Since IPs can change between sessions, it could show you incorrect information.
The developers say that they created this project just as a demonstration to showcase that bittorrent downloads are not private and it is easy to track you from publicly available information on the net.