Matthew Green is an Associate Professor of Computer Science at John Hopkins University, where he teaches courses, cryptography, distributed computing systems, blockchains, and cryptocurrency. He also helped create Zerocash, one of the first privacy cryptocurrency experiments, and ultimately influenced the Zcash protocol. He recently wrote an article titled, “In Defense of Crypto(Currency)”, in response to an open letter to Congress, signed by a large group of technologists, denouncing the ent...