According to COINOTAG, Vetle Lunde, head of research at K33, reported on December 12 that the net inflow into the 12 US spot Bitcoin ETFs has surpassed 500,000 BTC. This remarkable inflow represents over 2.5% of the total circulating supply, which is currently estimated to be around 19.8 million BTC. The rapid adoption of these ETFs, which began trading on January 11, reflects a strong investor interest and institutional participation in the Bitcoin market. As regulatory frameworks continue to adapt, the increasing integration of spot Bitcoin ETFs could pave the way for further growth in cryptocurrency investments, emphasizing the burgeoning acceptance of digital assets in mainstream finance. This trend highlights the significance of Bitcoin ETFs in shaping investor behavior and market dynamics.