"One error and your money is gone." Well, that's a scary thought. I saw a video years ago about people using Bitcoin in real-world transactions like buying fast food by using their smart phones and I looked at that and thought, this is such a tiny market, it's irrelevant. Now that there are debit cards for cryptocurrency, that's a game changer. And I like the idea of a Steem card too, backed by Visa or MC. This tutorial is amazing, and it's going to take a lot of study to really absorb it all. Thanks for this hard work!