Wow yeah, the wired description of it really rings a lot of bells in my head. I've got a lot of design work in a very similar direction.

Did you ever get a chance to turn it into something worth sharing? I'd be interested in an account along the lines of: "here are the decisions I made at the time, and now, with a decade of hindsight here's the ones I like and the ones I'd change if I were to try again."

I found this: https://www.infoq.com/presentations/document-coin/ which I guess addresses the first part of my curiosity.