By Luke Dormehl
In a world in which people increasingly pay for things using mobile wallets like Apple Pay, the presence of the machines you find at grocery stores, which turn your spare change into a more useful note-based form of cash, seem kind of retro. But they’re about to embrace one of the most exciting currency-based innovations happening right now — by allowing users to convert their regular cash into Bitcoin.
“Coinstar is always looking for new ways to…
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