Attendees at this week’s Oslo Freedom Forum, a 13-year-old annual gathering for human rights and pro-democracy activists, might have wondered at times if they’d mistakenly wandered into a cryptocurrency conference. Bitcoin developer Jimmy Song’s signature cowboy hat could be spotted here and there at the Oslo Concert Hall, where the forum, organized by the Human Rights Foundation, took place. The erudite investor and entrepreneur Nic Carter strolled around with an umbrella cane. On stage, aut...