Bloomberg ETF analyst Eric Balchunas tweeted that BlackRock's spot Bitcoin ETF, IBIT, briefly reached a peak asset size of $100 billion but has since fallen back to around $60 billion. Nevertheless, IBIT has only been established for about 500 days, and even if its size remains at this level for the next three years, it will still become the fastest ETF in history to reach $60 billion in assets.