According to BlockBeats, on July 12, the Bitcoin Exchange Traded Funds (ETFs) in the United States experienced a mixed fund flow. The Grayscale Bitcoin Trust (GBTC) saw a net outflow of 37.7 million USD. On the other hand, the Bitcoin ETF BITB reported a net inflow of 7.5 million USD.

This indicates a varied investor sentiment towards different Bitcoin ETFs in the US market. While some investors are pulling out their investments from GBTC, others are showing interest in BITB. The reasons behind this varied fund flow could be many, including the performance of these ETFs, market conditions, and investor strategies.

It's important to note that fund flows into and out of ETFs are not necessarily indicative of investor sentiment. They can also be influenced by various factors such as fund performance, market volatility, and investor risk tolerance. Therefore, while these figures provide some insight into the market dynamics, they should not be taken as a definitive measure of investor sentiment.