研究提供了完全因果、可复现的流程（开放代码与数据），揭示优化器的恢复路径主导了风险泛函的选择，并且在事前数据上调参会导致对最快轧空的保护崩溃——这对量化风险管理是重要的警示。
A study report benchmarking exposure-control objectives (CVaR, spectral risk measures, distributionally robust CVaR, entropic value-at-risk) against a hard-coded threshold rule for protecting a diversified short book from parabolic intraday moves in Binance USD-M perpetual futures. The motivating discussion is preserved with full attribution in SOURCE.md.
Note: every policy is scored on the same three axes: protection (fraction of peak squeeze loss avoided), cost (execution and turnover drag), and utility (net result once cost is set against protection). The universally optimal hedging design remains open. The full pipeline is published so every number can be checked; corrections are welcome.
Background. A short book in crypto perpetuals carries unbounded right-tail risk. A small-cap contract can multiply intraday on no news, and a daily rebalance leaves the original short size exposed for hours; the July 26 PIEVERSE pump, during which realized volatility reached twice its forecast within ten minutes, is the motivating incident. Open design issues include the choice of intraday lookback, the turnover cost of reacting quickly, the documented upward bias of five-minute volatility forecasts, and the rule by which falling volatility should rebuild a reduced position.
Methods. The sample covers all 697 Binance USD-M perpetuals with complete history from May through July 2026, resampled to 5-minute bars. A two-horizon volatility-acceleration score (100-minute against 48-hour RMS volatility, computed on BTC-residualized returns) triggers either a hysteretic threshold overlay or one of four tail-risk optimizers over drift-conditioned scenarios: CVaR, a spectral Kusuoka mixture, Wasserstein distributionally robust CVaR, and entropic value-at-risk. Execution is causal (next bar) and charged 20 bps one-way. June selects the lookback; July 1–8 calibrates thresholds; July 8–22 is the untouched test window; July 22–28 contains the verified incidents.
Results. The 20-bar window maximizes forecast rank correlation with next-25-minute realized volatility (median pair-level Spearman 0.49 in selection, 0.41 out of sample). Threshold rules protect 70.3–73.9% of aggregate peak episode loss where price rose at least 10% after t
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