Classification: (a) a concrete trading idea. The page body is only an advert and a notebook link. The notebook holds the mechanism: take 24 Binance-futures coins, price each in BTC, divide by its own slow EMA (alpha=0.001 on 1-minute bars, about a 17-hour half-life), and subtract the cross-sectional mean of that normalised ratio. Each coin is then held at a target of -trade_value*round(diff/1%), always on, dollar-neutral against BTC. It rebalances whenever the target moves by half a unit, at 20x leverage and 0.075% commission, and was backtested over about 5 days of 1-minute bars. Credit to 小草. That exact form breaks four of our lessons at once. It is an always-in multi-leg neutral book (L137, L150). It uses a hand-typed 2020 universe with heavy survivorship bias: IOST, QTUM, ONT, IOTA and NEO have since collapsed or been delisted (L151). It is cross-sectional reversal (L113). And it churns at 1-minute cadence on sub-fee moves (the fee graveyard). A 5-day backtest is no evidence. This restatement keeps the one economic claim, that an alt's BTC-relative price overshoots after idiosyncratic flow shocks and partly reverts. Everything the lessons ban is removed. (1) FLAT BY DEFAULT: nothing is held unless one coin is at an extreme; expected time in market is about 20-30%, flat the rest (L150). (2) Each trade is ONE alt against a beta-matched BTC hedge, not a 24-leg book. At most 2 pairs are open at once. (3) The universe is POINT-IN-TIME: at each 4H close, the top 20 Binance USD-M perps by trailing 30-day quote volume, excluding BTC, stablecoins, coins listed less than 90 days, and delisted names. No typed list (L151). (4) The clock is 4H bars, not 1-minute, and the trigger is a large deviation, so the per-trade gross move is several times the 4-leg round trip. Why the Binance USD-M venue (67.6% share): the mechanism needs a broad cross-section with multi-year history. OKX in our catalog has multi-year 4H history only for BTC/ETH/ADA, and Hyperliquid 4H has about 2.3 years (L168). The source is itself Binance futures. Mechanism in one sentence, instrument stripped: 'fade a single asset's extreme overshoot of its benchmark-relative price versus its own slow average, hedged against the benchmark, flat otherwise'. That differs from the banned always-on cross-sectional reversal books, but it is close enough that the analyst should weigh L113/L137. Honest prior: modest, priority 2.