You could create a DHT with all known torrents. Kademila was built basically with that in mind. The Kad network works pretty well, but it does face some problem

You could create a DHT with all known torrents. Kademila was built basically with that in mind. The Kad network works pretty well, but it does face some problems with spam; just sorting by seeders doesn't cut it since a spammer can fake as many seeders as he'd like.