Chances are you know someone who’s mined bitcoin. However, cryptocurrencies are not everything they appear to be. Drawing the ire of governments and financial institutions alike, questions about its reliability are on the rise. Prof. Ari Juels, computer science at the Jacobs Technion-Cornell Institute at Cornell Tech, discussed the impact, technology and regulatory environment of cryptocurrencies. Co-director of the Initiative for CryptoCurrencies and Contracts — a collaboration between Cornell, the University of California, Berkeley and the University of Illinois at Urbana-Champaign, based at Cornell Tech — Juels helps lead research on blockchain technology and its applications.