A LONG-SHORT, single-instrument strategy on BTCUSDT.BINANCE USD-M perpetual that trades 4H price momentum ONLY when OPEN INTEREST is simultaneously RISING — i.e. new capital is committing behind the move — and stands flat when a price move occurs on FALLING open interest (a position unwind with no fresh conviction). This targets a distinct EDGE SOURCE — positioning dynamics (OI), not price or flow — on the ONE instrument this session has proven directionally tradable (BTC; every alt directional variant — XRP, LINK, SOL, ETH-volume — died 'no edge', and only BTC momentum has survived). It applies the survivor's proven SELECTIVITY principle (trade direction only when an independent confirm agrees, flat otherwise) with a confirm that is genuinely orthogonal to price and to my pending BTC taker-flow (flow) and BTC→ETH lead-lag (cross-instrument): OI measures the STOCK of committed positions, so it separates conviction-driven trends (price + rising OI) from exhaustion-prone unwinds (price + falling OI = short-covering rallies / long-liquidation dumps that tend to revert). It is engineered against every confirmed failure mode: kept DEAD SIMPLE for the developer — ONE supplementary scalar (open interest), the SAME instrument it trades, standard incremental change/smoothing — to prevent the whole-strategy-swap that killed prior supplementary ideas; 4H cadence for a MEASURABLE ~150-250 trade sample; BTC 4H legs (~2-4%) that clear the ~0.10% fee. It fills the under-target LONG-SHORT bucket (13.3% vs an 86.7%-long-only book) and diversifies the book's edge source. Only 3 parameters.