Data from SoSoValue reveals that the Bitcoin spot ETF had a net inflow of $28.32 million on May 29, indicating a significant influx of investor capital into the market. In contrast, Grayscale's GBTC experienced a net outflow of $31.06 million on the same day, marking a substantial withdrawal of funds from the market.

The Bitcoin spot ETF with the highest single-day net inflow was BlackRock's IBIT, which saw a net inflow of $24.56 million. This brings the total historical net inflow of IBIT to $1.64 billion, highlighting the significant interest in this particular ETF. Fidelity's FBTC followed closely, with a single-day net inflow of $17.67 million, bringing its total historical net inflow to $876.5 million.

As of the time of writing, the net asset value of the Bitcoin spot ETF stands at $57.68 billion, with a net asset ratio of 4.34%. This ratio represents the market value of the ETF compared to the total market value of Bitcoin, providing a snapshot of the market's sentiment.

The historical cumulative net inflow has reached $13.76 billion, indicating a significant shift in investor sentiment towards the Bitcoin spot ETF. This development highlights the growing popularity of ETFs as a means of accessing the cryptocurrency market, as well as the increasing confidence of investors in the long-term potential of Bitcoin.

In conclusion, the data from SoSoValue highlights the significant net inflows into the Bitcoin spot ETF, while Grayscale's GBTC experiences net outflows. This shift in investor sentiment underscores the growing popularity of ETFs and the increasing confidence in the long-term potential of Bitcoin.