1. SEC v. W.J. Howey Co., 328 U.S. 293.
2. McGrath Goodman, Leah , The Face Behind Bitcoin, Newsweek (March 6, 2014 6:05 AM).
3. A new proof-of-work mechanism for bitcoin
4. Blockchain and the Law
5. Vigna, P. , SEC Chief Fires Warning Shot Against Coin Offerings, The Wall Street Journal (November 9, 2017).