The problem is peer discovery really. DHT sucks.

You could implement a peer tracker using Nostr. The demo on WebTorrent uses a tracker and that works pretty fast for me, so not sure why we can’t do that over Nostr

Otherwise it has everything you need: selective downloading of segments, hash verification, wtc

Also it supports HTTP sources. 

 All that a tracker has to do is to map infohashes to a list of IP:ports for peers. And nostr events are perfect for that