The NFC ring is[i:noazjxgj] ideal[/i:noazjxgj] for bitcoin. It was just waiting for the right protocol...
Noticed your product in the press while I was working on exactly that over past few months (openCXP) so I even made a mention of it in the draft white paper. Perfect fit. Draft is available for review below if anyone would care to comment:
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Currently soliciting any feedback/comments from those interested in the fledgling cryptocurrency POS and ATM industry - final version should be avail early dec.