Based on recent reports, the Bitcoin ETF with the most inflows is the one offered by BlackRock, specifically their iShares Bitcoin Trust (IBIT). The ETF has seen significant fund inflows, with a record-breaking amount of over $11.2 billion in a single day, surpassing its previous high of $8.72 billion. This strong inflow is indicative of investors' confidence in Bitcoin and the growing interest in cryptocurrency-based ETFs.