This would be useful, for instance, to have a torrent of a video series which always contains the latest episode instead of creating a new torrent each time, so the torrent would act more like subscription or RSS feed, which would encourage seeding as well since you would need to keep the torrent active in your client.
One major problem is malicious authors who would update a "verified" torrent with one that contains malware. Perhaps the torrent could somehow contain user reviews, and those reviews would be deprecated upon each update.
Does anything like this exist yet? Any other ideas on how to solve the malicious author issue?
This seems to differ from what is being proposed, which if I am understanding correctly is something like a link to an RSS feed which provides updates to an archive of torrents. Could this provide similar functionality to what I propose?