Grayscale Investments has taken another step forward in its journey to transform theGrayscale Bitcoin Trust (OTC: GBTC) into a spot Bitcoin (CRYPTO: BTC) ETF, by lodging a new registration document with the Securities and Exchange Commission (SEC). This action follows the directive of a D.C. circuit court, urging the regulator to take another look at Grayscale’s proposal. On Thursday morning, the asset management company presented an S-3 filing, a condensed variant of the standard S-1 filing typically utilized for new securities offered by companies in the U.S. before they can be listed on a n…