acd
New Member
Not sure if this counts, but I've just set an old MicroSD card up with Raspbian, cross compiled the Armory Bitcoin client for ARM and am using it as a cold storage Bitcoin wallet.
Not exactly the same thing, but I do something similar with my trusted CA privatekey for my vpn, pki auth, etc. It's not rpi though, I have it on my beagleboard, though there's no reason you couldn't do it on the rpi.