Leonard Harris Sassaman (1980 – July 3, 2011) was an American technologist, information privacy advocate, and the maintainer of the Mixmaster anonymous remailer code and operator of the randseed remailer. Much of his career gravitated towards cryptography and protocol development. He is considered a strong candidate for the identity of Satoshi Nakamoto, the pseudonymous developer of the first blockchain reference implementation now widely used in digital cryptocurrencies.