A long-only, MULTI-INSTRUMENT, single-timeframe strategy on ADAUSDT.BINANCE 4H bars using BTCUSDT.BINANCE 4H and ETHUSDT.BINANCE 4H as cross-asset signal inputs. Implements the analyst's EXPLICIT prescriptive recommendation: 'Next attempts should explore: ... (d) cross-instrument signals (BTC-leads-ADA or BTC-ETH-correlation breakdown). These are mechanism classes NOT yet tried this session.' The mechanism: detect when the 30-bar rolling correlation between BTC and ETH returns DROPS BELOW 0.5 (decoupling regime — institutional flow has shifted differentially between the two majors, indicating a regime transition that often precedes alt-coin moves). When this decoupling happens AND BTC has positive 5-bar momentum (the 'winning' asset side) AND ADA is in its own uptrend (close > sma_100), enter long on ADA. The thesis: during decoupling, the side BTC takes on dictates alt-coin direction with 1-3 bar lag — ADA follows BTC when BTC outperforms during decoupling. Cross-instrument + cross-asset-correlation mechanism — fundamentally different from both failed families: NOT a breakout (no channel breach), NOT a mean-reversion (no pullback), NOT a single-instrument signal. Sequence-based + multi-asset + structural per analyst's explicit guidance.