China is so far ahead of the west in real-time (and live) peer to peer streaming. Look at video systems like QVOD (now dying after state intervention), Xigua, JJVod: they all have a central tracker and use swarms of users to supply realtime video streaming. PopcornTime was a decent example of this but China's been doing it for years - it was live television streaming over p2p first with PPLive, PPS, Sopcast, etc and this then morphed into streaming of films and television. All use a slightly modified version of bittorrent. Most use bittorrent hashes to mark content.

I still can't understand why this has been Bram Cohen's main focus for the last few years and he still doesn't have a working prototype.