Tyler and Cameron Winklevoss, CEO and President, respectively, of cryptocurrency exchange Gemini, talk about the importance of regulation in a sector once associated in popular culture with illicit activity. The twin brothers, who were the first to file with the SEC for a Bitcoin ETF, recount how they went from competing in the Olympics to launching a cryptocurrency company, explain why they believe private blockchains are really just distributed databases, and discuss why we've seen so many hacks of Bitcoin exchanges. They also touch on an emerging trend, app-coins or new cryptographic tokens being used to run, say, peer-to-peer versions of Dropbox or Reddit.