CEO and founder of Digital Currency Group (DCG) Barry Silbert said Grayscale Investments is suing the U.S. Securities and Exchange Commission. What Happened: Grayscale, which is owned by DCG, is challenging the decision by the SEC to deny the conversion of Grayscale Bitcoin Trust (OTC: GBTC) into a spot Bitcoin (CRYPTO: BTC) exchange-traded fund, according to a statement shared by Silbert.