From the FAQ: Q. Can I lock my Coin? A. Currently you cannot lock your Coin, but you don’t have to. Coin will automatically deactivate if it loses contact wit

From the FAQ: Q. Can I lock my Coin? A. Currently you cannot lock your Coin, but you don’t have to. Coin will automatically deactivate if it loses contact with your phone for a period of time that you configure in the Coin mobile app. Bummer! Seems like there should be a way to use your phone to lock it down. Either way this is cool as hell.