By Kirk O’Neil Bitcoin is making inroads into the fast-food industry. The day when you can buy your Big Mac at McDonald’s (MCD) – Get McDonald’s Corporation Report, Whopper at Burger King or shake at Shake Shack (SHAK) – Get Shake Shack, Inc. Class A Report using bitcoin might be coming soon. Bitcoin is already making inroads into the fast-food industry. One fast-food chain has rolled out a rewards program to test customers’ interest in cryptocurrencies, which might determine whether it begins accepting bitcoin or other cryptocurrencies as payment. Shake Shack on Friday confirmed on Twitter th…

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