Interesting, Google put out a open-source bluetooth module for creating bluetooth beacons called Eddystone. I know Apple tried this a few years back. But…now we have bluetooth low energy, and this is “free” to build on. So….It could go somewhere. Alot of folks talk about NFC being the way to go, but I haven’t seen alot of NFC stuff out there yet. So this could be a good alternative.
http://gizmodo.com/why-you-should-care-about-googles-new-open-source-bluet-1717886196