A LONG-ONLY (LONG/FLAT, never short), SINGLE-INSTRUMENT, DAILY Donchian-channel breakout trend strategy on BTCUSDT.BINANCE (USD-M perpetual) deliberately constructed to be BACKTESTABLE under the current engine state, which has three confirmed, strategy-unfixable defects: (1) the USD-M perp base entry pipeline OVER-DEPLOYS exposure to ~2-5x and ignores strategy-level caps/flat-guards — but every proof case shared DYNAMIC daily re-sizing and/or frequent LONG-SHORT FLIPS (the leading diagnosis is a hedging-OMS stacking opposing positions on each flip), while the one recent run that sized CORRECTLY (avg_position_pct 53.7%, metrics_reliable=true) did NOT exhibit that pattern; (2) spot-CASH held-position MTM is broken (so this uses PERP, not spot); (3) multi-instrument equity aggregation is broken (so this is SINGLE-instrument). This design therefore avoids the over-exposure trigger BY CONSTRUCTION: it is LONG/FLAT only (never holds a short, so it can NEVER hold two opposing positions / flip long->short), it uses ONE fixed-fractional position size set at entry with NO daily re-sizing (no vol-targeting, no funding-scaling — the resizing patterns that produced the stacking), and it EXPLICITLY closes to flat before any re-entry. It also restricts signals to OHLCV ONLY (the confirmed deep, wall-free feed; liquidations/OI/account-ratio/taker are all data-walled) and trades the validated daily breakout/trend edge in the with-trend (momentum) direction on BTC, the cleanest core trender. It is distinct from the promoted LS TS-momentum sibling by being long/flat + breakout-entry (a different, simpler return profile) and from the promoted alt Donchian-long books by instrument. Tail-safe: leverage 1.0, hard ATR stop. PRE-REGISTERED ACCEPTANCE: avg_position_pct must be <= ~100% (one position, no stacking) and no single-day return beyond ~+/-15-20% (BTC's max daily move at 1x) — if violated, it is the engine over-exposure defect, not the strategy. Low parameter count.