Bitcoin ETFs AUM Heatmap Highlights Growth 🟠 iShares Bitcoin Trust ETF (IBIT) leads with over $50B in AUM, surpassing 500,000 BTC holdings. 🟠 Fidelity Wise Origin Bitcoin Fund (FBTC) and Grayscale Bitcoin Trust ETF (GBTC) follow, each managing over $20B in assets. 🟠 Bitcoin…