Bitcoin fell sharply in volatile Thursday trading, dropping to $88,522, its lowest level in months, as selling pressure swept across the digital-asset market. The sudden decline erased more than $1 trillion from the global crypto market, pushing total valuation down to nearly $3.2 trillion from above $4.2 trillion earlier this month. The move deepened a six-week slide in which Bitcoin has already lost more than 25% from its October highs.