BlackRock has underscored the limited supply of Bitcoin, noting that if every U.S. millionaire attempted to purchase 1 BTC, the supply would fall short. This highlights Bitcoin's capped supply of 21 million coins. The statement comes as interest in Bitcoin surges, driven by factors such as El Salvador's adoption of BTC as legal tender and the approval of Bitcoin and Ethereum ETFs. These developments have spurred increased accumulation by financial institutions, including BlackRock, despite high prices.