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Changhyun Lee is a Senior Researcher at ETRI in the Blockchain Research Lab since February 2017. Prior experience includes a role as a Researcher at the National Security Research Institute from July 2015 to January 2017, and a Research Internship at Microsoft Research in mid-2013. Changhyun also served as a Visiting Scholar at the Institute for Pure and Applied Mathematics at UCLA for a brief period in late 2008. Educational qualifications include a Ph.D. in Computer Science and a B.S. in Computer Science, both from the Korea Advanced Institute of Science and Technology, completed in 2015 and 2007, respectively, alongside a high school education at Chungbuk Science High School from 2001 to 2003.