I like the idea of a tracker crawling the DHT. Research institutions could sign their torrents with their private keys and the tracker only indexes those signed

I like the idea of a tracker crawling the DHT. Research institutions could sign their torrents with their private keys and the tracker only indexes those signed with approved keys. Institutions register their public keys with the tracker and when an institution loses their keys, only their torrents are affected. Anyone can run such a tracker and there is no central authority. Nice. Is it possible to store signatures in torrent metadata?