Authorized cash?

I recall a few months ago there was some discussion of having David Chaum come out and work with some cypherpunks to get them started on an implementation of digital cash. Did anything ever come of that? Chaum has a patent, I've heard, on the "blinding" that is an important part of at least the simpler cash proposals. If he were willing to authorize a cypherpunks cash system it would remove one legal hurdle to its implementation. Does anyone know whether he might be willing to do this? Hal