Major cryptocurrencies traded mixed on Thursday evening as U.S.-listed spot Bitcoin exchange-traded funds (ETF) began trading amidst high anticipation. What Happened: Bitcoin briefly surged to over $49,000 on Thursday, marking its first time reaching that level since December 2021. The cryptocurrency, which is the largest by market capitalization, began the day below $46,000, then swiftly rose above $47,000 before peaking at $49,042 during the early U.S. trading session. However, it subsequently relinquished all its gains and is now trading above the $46,000 mark. In the last 24 hours, data fr…