Well, there's a draft to specify semantics of a torrent-of-torrents and incremental updates http://bittorrent.org/beps/bep_0049.html http://bittorrent.org/beps/

Well, there's a draft to specify semantics of a torrent-of-torrents and incremental updates http://bittorrent.org/beps/bep_0049.html http://bittorrent.org/beps/bep_0049.html But that'll need revising once sha1 torrents are deprecated.