I enjoyed this post. Technology has come such a far way. I once read a book that took place in the future, where everyone's ID was implanted in their wrist and they could swipe with it to pay for things and to confirm their ID. With these, this may become a reality.
One concern I would have is that when you pay for things using something fun like this, and you can't see the cash leaving your pocket, it may encourage people to spend more and not be aware of how much they are spending. Another concern is how easily could it be hacked to steal money, but they have probably already thought of this, like putting in a pin during larger purchases.
Otherwise, this looks like great technology and I can't wait to see what is next.
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