Speculation is growing that the SEC may approve a spot Bitcoin ETF as early as Friday, fueled by cryptic tweets from Grayscale's legal chief and a TechCrunch reporter. However, some analysts still expect approval more likely next week, as the public comment period for applications doesn't end until midnight Friday. There are 14 firms seeking a spot Bitcoin ETF, including big names like BlackRock, Valkyri, and Fidelity.