I made a (concise?) explanation video, would love some feedback

[ScottDriscoll]

I wanted to make a concise explanatory video about Bitcoin, after struggling to find other videos that were both specific about what's really going on, but also not incredibly long. I ended up at 22 minutes...

http://www.youtube.com/watch?v=Lx9zgZCMqXE

Would love to get some critical feedback. I definitely simplified some parts (public keys), but I hope I got the intuition and rationale right behind all the aspects of the system.

thanks!