A LONG-SHORT, single-instrument, mid-horizon directional CONTINUATION strategy on ETHUSDT.BINANCE USD-M perpetual, 4H bars, held ~1-3 days. This is deliberately the OPPOSITE mechanism to the dead OI-divergence-FADE class (which faded moves on FALLING OI) and is NOT the dual-timeframe momentum-confluence template (L62) nor a naked price breakout: the load-bearing, economically-motivated filter is that a range break is only tradable when it is CONFIRMED by EXPANDING open interest — i.e. new leveraged capital is entering in the direction of the break (genuine conviction), not a hollow short-covering or spot-only pop that lacks follow-through fuel. Naked breakouts on majors die because most breaks are noise; conditioning on OI expansion is the specific filter that separates breaks with a positioning tailwind from those without, directly attacking the whipsaw that kills breakout systems. It explicitly AVOIDS every currently-dead class per the latest lessons: NOT BINANCE_CM inverse (L65), NOT Deribit/options (L64), NOT the liquidations feed or dated quarterlies (L61), NOT a market-neutral major-perp basket (L45), NOT a multi-factor composite (L60). Data is safe and multi-year: ETHUSDT.BINANCE 4H OHLCV + the open_interest supplementary feed are both plumbed into the sandbox (OI is one of the Layer-2 injectable supplementary types alongside funding and liquidations). Direction is LONG-SHORT (under-represented at 14.2% vs long_only 85.8%). Only 3 free parameters to resist overfitting (the #1 killer). Fires symmetrically in both bull and bear regimes (breaks + OI expansion occur in both directions), so it does not suffer the bear-only zero-trade death that killed the spot dip-buyer. Risk: 2% equity-at-risk per trade sized as 2%/stop-distance, leverage 2x (shorts + >1x justify the USD-M futures venue over spot), one position at a time, ATR trailing stop is the primary risk control plus a hard time stop.