According to Lookonchain monitoring, on December 17, ten US bitcoin ETFs had a net inflow of 4,790 BTC ($508.25 million), of which BlackRock inflows 3,935 BTC ($417.52 million), and BlackRock currently holds 542,956 BTC ($57.61 billion); Nine Ethereum ETFs had net inflows of 12,347 ETH ($48.65 million), of which BlackRock had inflows of 7,572 ETH and currently holds 991,151 ETH ($3.91 billion).