Trading volumes for BlackRock’s spot bitcoin ETF eclipsed those of Grayscale Investments’ competing product at market close Thursday, marking a first since such funds began trading on Jan. 11. The Grayscale Bitcoin Trust ETF (GBTC) has dominated trading volumes in the first three weeks of US spot bitcoin funds trading. GBTC had accounted for nearly half of volumes — roughly $14.4 billion of $29.3 billion — in the first 15 trading days for the 10 ETFs in the segment, according to Bloomberg Intelligence data. But while GBTC notched trading volumes of about $292 million on Thursday, BlackRock’s iShares Bitcoin Trust ... (full story)