BlackRock has executed significant withdrawals from Coinbase Prime, pulling 1,780 ETH valued at approximately $3.79 million and 1,450 BTC worth around $99.71 million. These transactions were conducted through BlackRock's Ethereum ETF, ETHA, and Bitcoin ETF, IBIT, respectively. The withdrawals, monitored by Arkham, suggest potential further activity as BlackRock manages its crypto holdings.