The US crypto investment firm Grayscale Investments (https://grayscale.com) has sued the U.S. Securities and Exchange Commission (SEC) after the regulator rejected its application to transform its flagship Grayscale Bitcoin Trust into a spot Bitcoin Exchange-Traded Fund (ETF). The SEC rejected Grayscale’s application because the $40B Bitcoin Trust failed to meet consumer protection requirements including measures “designed to prevent fraudulent and manipulative acts and practices.”