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While the Friday inflow ends the streak of net GBTC withdrawals, BlackRock’s iShares Bitcoin Trust (IBIT) is challenging the fund for the title of biggest bitcoin ETF. GBTC now has $18.1 billion in assets, versus IBIT’s $16.9 billion. IBIT, now in second place, started at zero in January, while GBTC had more than $26 billion.