Grayscale Investments CEO Michael Sonnenshein shared a positive outlook on the potential approval of a spot Bitcoin (CRYPTO: BTC) ETF. What Happened: In an interview with Yahoo Finance, he said, “We’re feeling optimistic,” Sonnenshein remarked, highlighting the proactive engagement with the U.S. Securities and Exchange Commission (SEC). The SEC’s questions indicate a willingness to progress on this matter, he adds. This optimism comes amidst a backdrop of regulatory delays and skepticism from traditional financial sectors. Also Read: Bitcoin Short Sellers Beware: Analyst Sees No Sign Rally ‘Ov…