BlackRock's Bitcoin exchange-traded fund (ETF) stands out as the sole U.S.-based spot Bitcoin fund to experience inflows in the last two days, contrasting with stagnant or decreasing flows in other ETFs. Specifically, the iShares Bitcoin Trust (IBIT) recorded a net inflow of $73.4 million on April 15, a decrease from the previous day's $111.1 million. In contrast, apart from Grayscale's fund, the remaining eight ETFs reported no inflows during this period, according to data from Farside Investors.

Despite IBIT's positive inflows, they were overshadowed by outflows from the Grayscale Bitcoin Trust (GBTC), which witnessed $110.1 million exiting the fund on April 15, a decrease from the $166.2 million outflow on April 14. The comparison of IBIT's two-day flows with GBTC's and the total flows is illustrated in the data provided by Farside Investors.

Across April 14 and 15, all ten spot Bitcoin ETFs experienced net outflows totaling $55.1 million and $36.7 million, respectively. This trend of outflows in U.S. Bitcoin ETFs coincides with a turbulent period for Bitcoin, which saw an 11.6% decline to $63,410 during the week, as reported by Cointelegraph Markets Pro.

Moreover, global Bitcoin investment products encountered outflows of $110 million for the week ending April 12, indicating investor hesitancy, according to CoinShares' research head James Butterfill. Notably, all crypto investment products combined saw net outflows of $126 million last week, with trading volumes rising from $17 billion to $21 billion week-on-week.

Bitcoin's price movements have been influenced by external events, such as Iran's attack on Israel on April 13, which led to a significant drop in Bitcoin's value to a three-week low of $61,918. Additionally, anticipation surrounding Bitcoin's halving scheduled for April 20 has contributed to price volatility as traders speculate on its impact on Bitcoin's market performance.