BTC  I am a retailer interested in bitcoin.  I was interested in potentially using them in my store but I would need a simple way of transferring coin in a real life retail setting.  Has anyone developed an app? If not, you should. Remember it should be simple, cost less than the current credit card rate of 3% per transaction and have mobility as well as security. I currently use square on my cellphone and it works great. It is easy to use and easy to track sales, taxes, and gratuities.