A little over three years ago, Jamie Dimon called me. Bitcoin was at an all-time high. Ethereum was mooning. ICOs were pumping. And Jamie wasn't having it. He called Bitcoin a fraud. I decided to write him an open letter, and the piece went viral. Two days later, he called. He was gracious, thanked me for the explanations in the post, and asked me to spend some time with his team. But the funny thing is, I didn't write the post for Jamie. I wrote it as a primer for people who were o...