Square is testing cryptocurrency support in their Cash app, according to TechCrunch reader Zach Miles on Twitter and confirmed by the company. The trial, which seems to only be available right now to a small number of users, lets you buy and sell bitcoin directly in the app. The interface is very basic. Users who have access to the beta can swipe right from the Cash Card page to access bitcoin functionality. Once there users will see a balance in USD and BTC, a graph showing performance over the last day, month or year and buy / sell buttons.