Since their apparition, cryptocurrencies intrigue and fascinate. Over time, highly sophisticated products, cryptocurrency derivatives, with cryptocurrencies as their underlying have emerged. The development of these products in recent years has raised the concern of regulatory authorities around the world and consequently the importance of regulating it. The first part of this book discusses how cryptocurrency derivatives are legally characterized under French and U.S. laws. It describes their perception by the doctrine and the regulatory authorities in France and in the U.S. It also discusses whether cryptocurrencies can be considered to be eligible underlying to derivatives.The second part examines the consequences of the characterization of cryptocurrency derivatives. It provides a description of the French and American regulatory frameworks applicable to these products.