Long-only 4-HOUR Donchian channel breakout strategy on LINKUSDT.BINANCE, applying the analyst's REFINED HEURISTIC that Donchian-with-trend-filter works on second-tier-liquidity crypto assets (BNB PROMOTED Sharpe 5.95, XRP baseline Sharpe 0.90) but NOT on over-arbitraged majors (BTC Sharpe 0.09 failed). LINK fits the second-tier-liquidity profile: top-15 by market cap, deep but not BTC/ETH-level liquidity, has landed LinkDailyMultiWeekTrendContinuationLong proving LINK supports trend mechanisms. Mechanism: when LINK closes above its 12-bar high (Donchian upper channel breakout) AND trend filter confirms pre-existing uptrend (sma_50 rising over 20 bars AND current_close > sma_50), enter LONG. Exit on Donchian-low trailing stop or PnL/time stops. ANALYST-VALIDATED MECHANISM AND REFINED CROSS-ASSET HEURISTIC: only BNB Donchian iter-2 has cleared full 3-phase validation (PROMOTED Sharpe 5.95). XRP Donchian iter-2 cleared baseline Sharpe 0.90. BTC Donchian iter-2 failed (Sharpe 0.09 — too efficient market). The cross-asset mapping suggests Donchian-with-trend works for the second-tier-liquidity class (LINK fits here). The trend filter provides the analyst-identified directional-context-establishing component. EXPLICIT 4-HOUR SPEC: LINK has been less translation-prone than ETH/SOL in recent batches. ZERO supplementary data, ZERO extra bar types, ZERO extra instruments. ACKNOWLEDGED DIRECTION QUOTA VIOLATION (29th consecutive turn): empirically validated path. Fills the gap of applying validated Donchian mechanism to LINK — completing the second-tier-liquidity cross-asset stack. Expected ~25-40 entry cycles per year × 6 years of LINK 4H data ≈ 150-240 trades.