I think it's a reasonably good idea, but it has a lot of refining to be done. Only ideas which are close to perfect receive human capital (coding) and financial capital. You could setup some brainstorming sessions with friends to work out how to compromise your system. You should also research the history of systems like this, apart from the QR code element, it's an idea that's had many forms over time. So check out the ideological competition as it were. Steal their best ideas! (can't remember the name of the banking system, but there's one which is something like this)I'm a big fan of having a BTC -> Cash and Cash -> BTC market internalized within the black market. I think our pals at bitcointalk.org are the most likely to actively help you with your mission here (don't mention SR ;-) , they're big supporters of decentralization and redundancy systems in case a government tried to stamp down on Bitcoin. (issue: can LE potentially black-list particular bitcoins?)The Silk Road is definitely behind any ideas to make this work, the key issue is that there's lots and lots of ideas out there, and we can't invest our time and energies into them all (hence the interest, but lack of replies). As such it's a lot like a snowsledge or toboggan, you got to push hard at the begining to get it moving with your own energies, but after a while gravity takes over and you pick up speed.Once you have a "proof of concept" setup, you'll be inundated with supporters! :)