Analysis shows that after the launch of U.S. spot BTC ETFs, Bitcoin saw more short liquidations while altcoins faced significant long liquidations.Bitcoin's trading activity signified a dominance of short liquidations, while altcoins suffered from a wave of long liquidations.Bitcoin experienced around $190 million more in short liquidations compared to longs, indicating an upward momentum led by short squeezes.On the other hand, altcoins endured almost $1 billion more in long liquidations than shorts, revealing failed expectations of an 'Altseason' rally.