Futures tracking crypto markets saw some $155 million in shorts liquidated in the past 24 hours after a sudden uptick in prices in U.S. hours. Traders betting against higher bitcoin prices lost over $100 million. The liquidations occurred as expectations of a spot bitcoin exchange-traded fund approval in the U.S. neared, with BTC surging as high as 9% on Monday. Potential ETF issuers like BlackRock and Grayscale filed their offering fees to the SEC on Monday, marking one of the final steps before the first-ever bitcoin ETF can be floated in the U.S. Thirteen proposed ETFs are awaiting SEC approval.