Odaily News HODL15Capital shared information on X that BlackRock Bitcoin Spot ETF (IBIT) has modified the Coinbase Custody Agreement, requiring it to "process the operation of withdrawing digital assets from the custody account to the public blockchain address within 12 hours after obtaining instructions from the client or the client's authorized representative." HODL15Capital said that these modifications reflect BlackRock's efforts to strengthen its operating framework and improve liquidity amid recent doubts.