According to Farside Investors, BlackRock's Bitcoin ETF recorded a substantial daily inflow of $287.5 million on May 21, 2025 (source: FarsideUK on Twitter; farside.co.uk/btc/). This significant capital movement signals strong institutional demand for Bitcoin, which often correlates with upward price momentum in the broader crypto market. Traders should monitor ETF inflow patterns, as high inflows typically indicate increasing investor confidence, potentially driving further bullish sentiment and volatility in Bitcoin and altcoins.