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Interesting idea. I think it's biggest downfall is that it's yet another item that you are carrying around. Doesn't seem like it's as convenient or as cheap as printing QR Codes. And NFC could be used for just about any data, where this seems like it's targeted at purchases.

Still gotta give props to the creative thinking.

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The idea is to not actually have people carrying the stamp - you are already carrying your smartphone. The stamp should be placed at a static, centralized location (e.g. the point of sale at a retailer) and used to authenticate transactions (loyalty punches, coupon redemptions, even payments in some niche applications) with customers' smartphones. Does that make sense?

Completely. I got that from the description. I just sort of thought we were slowly moving away from that. Maybe I've seen too many commercials with the retailer swiping your credit card with a phone. Or those phone bump commercials. :) I'm sure the static point of sale method will not go away any time soon.

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