A long-SHORT, SINGLE-INSTRUMENT, single-venue reversal strategy on BTCUSDT.BINANCE USD-M perpetual futures using 4-HOUR bars, where OPEN INTEREST (supplementary data) is the structural signal and price action is the P&L (OI is used only as a signal, never credited as a cash flow). The thesis is trapped-positioning unwind: when a sharp directional price move is accompanied by a sharp RISE in open interest, it means the move is driven by NEW leveraged positions piling in (fresh longs into a rally / fresh shorts into a sell-off) rather than by genuine spot demand — a crowded, offside book. Once price stalls and turns, those new positions are underwater and become forced fuel (long liquidations / short covering) that drives a sharp reversal. The strategy fades the exhausted move only when OI confirms crowding, and explicitly SKIPS moves where OI is falling (healthy de-leveraging with no trapped fuel). This deliberately avoids every recurring failure this session: NOT BINANCE_SPOT (CASH metric bug), NOT BINANCE_CM (not backtestable), NOT cross-venue/Hyperliquid (basis artifact), NOT a multi-instrument pair (extra-leg feed not delivered to optimizers), NOT funding-carry (no uncreditable cash flow), NOT trend-following (over-represented/overfit-prone), and NOT generic buy-the-dip MR — it is gated on an observable positioning-crowding condition (OI surge), giving a POSITIVE-skew forced-unwind payoff rather than the negative-skew falling-knife profile that killed prior MR attempts. BTC is chosen for the deepest, most reliable OI history (minimizing the data-sparsity risk that broke alt-based ideas). It fills the long-short direction quota (only 14.4% vs heavy 85.6% long-only) on the clean single-instrument USD-M OHLCV path, and is kept to ~4 parameters to resist overfitting.