Blackrock’s IBIT has officially become the fastest exchange-traded fund (ETF) to reach $80 billion in assets under management (AUM), hitting the milestone in just 374 days and helping push total spot bitcoin ETF assets past $140 billion. IBIT Rockets to $83 Billion, Fueling Spot Bitcoin ETF Boom Past $140 Billion Blackrock’s iShares Bitcoin Trust (IBIT)