BTC ETF AUM Flow Oscillator [ΔAUM + Δ²AUM + Peak Signal Markers]

This TradingView oscillator tracks Bitcoin ETF flow dynamics using volume × price proxies from major ETFs like IBIT, FBTC, BITB, and others. It calculates both the first derivative (ΔAUM) to show net inflows/outflows and the second derivative (Δ²AUM) to reveal momentum shifts. Significant accelerating inflows or outflows are highlighted with green and red triangle markers at local peaks or troughs, based on z-score filtering, giving traders an early visual signal of major positioning shifts without waiting for delayed AUM updates. Thoughts welcome.