Interesting, how do you envision that looking?
Discussion
All you need is a chat channel people can follow that posts magnet links.
Chat is too closed, that could work for private trackers but I would prefer open listings with comments.
Simply proposing a new event kind for sharing bittorrent magnetic links with some extra metadata (title, description, media info, size) and building a webclient that can visualize there torrent listings just like in tpb/rarbg.
You can even reply to these events with regular kind=1 notes that would work as comments to the torrent listing and people can zap the listing as part of supporting the original torrent creator.