Companies: Bitsie , Bad Decisions. The transactions are secured by «military grade cryptography,» according to the Bitcoin Foundation, and the codes that are assigned to bitcoins that verify a person’s ownership can be stored on devices that don’t remain connected to the Internet, protecting them from hackers. The bar has accepted Bitcoin since last December , was one of the first Baltimore bars to use Foursquare as a marketing tool and even has its own mobile app. It changes in real-time. Latest Business. Indeed they are. But uncertainty over the safety and future of bitcoins has contributed to wild swings in their value.