Jeff John Roberts, an author and journalist, dug deep into the world of cryptocurrency to figure out what the rest of us really need to know about it. He acknowledges that the proliferation and volatility of digital currencies can make them seem like a fad but argues that the oldest among them -- bitcoin -- and the blockchain technology behind it are here to stay because they offer a more efficient way for companies and consumers to transact. He describes in plain English how crypto works and explains why now is the time for forward-thinking business leaders to understand -- and adapt to -- this new kind of currency. Roberts is the author of the book "Kings of Crypto: One Startup's Quest to Take Cryptocurrency Out of Silicon Valley and Onto Wall Street."