A LONG-SHORT, SINGLE-INSTRUMENT directional strategy on SOLUSDT.BINANCE USD-M perpetual whose signal is NOT price-derived at all — it is the exchange's TAKER BUY/SELL VOLUME split (aggressor flow), a crypto-native microstructure series that is collected as supplementary data (taker_ratio) with multi-year Binance history and is injectable into the Layer-3 sandbox. On each 1H bar we compute a cumulative taker-delta = (taker_buy_vol - taker_sell_vol)/total_vol, standardize it as a rolling z-score over a lookback window, and take a position in the DIRECTION of dominant aggressor flow only when that z-score is extreme AND still building. This is order-flow MOMENTUM (persistence of who is hitting the book), deliberately distinct from the dead classes flagged by the meta-learner: it is NOT OI-gated (L71), NOT funding-gated (L70), NOT a cross-venue carry two-leg (L69), NOT a cross-sectional rotation basket (L68), NOT a pure-OHLCV trend/momentum-confluence clone (L9/L41/L62 — the price series is only used for the exit stop, never the entry), and NOT an options/COIN-M structure (L64/L65). Fills three under-represented portfolio buckets at once: long_short (14.2% vs ≤55%), a fresh microstructure mechanism absent from the 0.7%-survival book, and mid/short horizon. Deliberately only 3 fitted parameters (z-lookback, entry_z, ATR-stop multiple) to resist the 338x overfit graveyard.