The regulations that apply to purchasing and selling cryptocurrency vary from jurisdiction to jurisdiction. In the United States, the most prominent of these regulations are those issued by the Securities and Exchange Commission (SEC), which is responsible for the regulation of securities in the US. Depending on the type of cryptocurrency being purchased or sold, different sets of rules may apply. Additionally, different states may have further regulations regarding the sale and purchase of cryptocurrencies. It is important to check the laws applicable to your geographic location before engaging in trading activities.