OK, I had this idea a wile back and I finally got round to designing the concept, I don’t know if it would fly, but I think it is quite neat. Fundamentally the principle is that people in rural areas are pretty much excluded from the e-Cash revolution on the basis that they don’t have the infrastructure. By rural I am most interested in the way in which people in small villages or remote locations interact, especially in developing countries. We don’t have a means by which we could eliminate currency in their domains, we only have solutions for client server architecture in rich urban settings. Also the proposal for NFC is being built around expensive smart-phones which also doesn’t help the poorer in society. So I designed a device which should be cheap (~$10) and which can be used without being dependent on infrastructure.
I did a PDF to illustrate the Portable Currency Device concept.