This document summarizes the key U.S. regulatory agencies and laws governing blockchain and cryptocurrencies. It discusses how the SEC views most tokens as securities and applies the Howey test. The CFTC considers cryptocurrencies a commodity and regulates derivatives contracts. FinCEN regulates exchanges and administrators as money transmitters under anti-money laundering and know-your-customer laws. While regulations are still developing, the SEC, CFTC and FinCEN increasingly oversee initial coin offerings and cryptocurrency trading activities.