[KirillPanov]

First it needs to support BEP44 "Mutable DHT", which is arguably a much more useful feature than mutable torrents. It is also a much simpler feature.

http://www.bittorrent.org/beps/bep_0044.html

[MayeulC]

I agree that's a dependency, but I am not sure how much more useful it would be comparatively?

[contravariant]

Pretty sure it gets you most of the way there by simply putting a mutable magnet URI in DHT. The rest is just a clever way of reusing already downloaded blocks.