BlackRock ETF head Samara Cohen has told CNBC that most demand for Bitcoin comes through investment tools like ETFs, not direct purchases from crypto exchanges. She highlighted that 80% of Bitcoin ETF buyers are direct investors, and 75% are first-time buyers of BlackRock's iShares products. The total market cap of all 11 spot Bitcoin ETFs has reached over $63 billion, with nearly $20 billion in inflows. In the last five trading days, spot Bitcoin ETFs saw over $2.1 billion in net inflows, with BlackRock responsible for half.