You must be talking about indexing torrents then, which has nothing to do with bittorrent per se. It's "just" a website where people drop content and comments e

You must be talking about indexing torrents then, which has nothing to do with bittorrent per se. It's "just" a website where people drop content and comments evaluating the quality of said content. Indexes are used for searching for and retrieving content. Bittorrent is decentralized, but Bittorrent (the protocol) says nothing about how you retrieve a torrent. It starts the moment you have retrieved a torrent (or, possibly, a magnet link), and not before.