Chiming in:

This particular protocol is the best to happen to usable security in a very, very long time.

This simple protocol extension offers two-factor authentication at higher usability and security than a one-factor login/password combo.

Assuming most people have some sort of screen lock on their phones, this provides for a two-factor authentication at the ease of pointing your phone at the screen. Bravo! Applause!

I actually wanted to start implementing this protocol server-side today, and was surprised to see that my Android wallet didn't yet have support for it.

I can't wait to offer something as simple and secure as this to users of my systems.

Cheers,
Rick