When David Yermack, the finance department chair at New York University Stern School of Business, first offered his course on blockchain and financial services in 2014, 35 students signed up, eight fewer than the school’s typical elective. By spring 2018, the number of enrolled students climbed to 230, forcing Stern to move the class to its largest auditorium. This academic year, Yermack will teach the blockchain course both semesters to meet interest from students. Yermack says he first deve...