Odaily News According to Farside Investors data, the US Bitcoin spot ETF had a cumulative net outflow of US$37.3 million in the past week, of which Grayscale GBTC had a net outflow of US$155 million, Fidelity FBTC had a net outflow of US$13.9 million, and BlackRock IBIT had a net inflow of US$82.4 million.