SPECIMEN 002 / STRATEGY AUTOPSYCRYPTO · OUT-OF-SAMPLE TESTED
The Golden Cross
The most famous signal in trading — go long when the 50-day average crosses above the 200-day. Tested honestly, it cannot reliably beat doing nothing.
Trend / momentum
Spot · daily · 50/200 SMA
10 coins · out-of-sample
No edge · coin flip
The claimRide every trend, dodge every crash.
The realityBeat holding on just 5 of 10 coins. A coin flip you pay fees to make.
Cause of death No edge, a coin flip
01 The seduction
It gets its own CNBC headlines. When the 50-day crosses above the 200-day an uptrend is “confirmed”; cross back below — the death cross — and you sit out. It sounds like discipline: ride the trends, dodge the crashes. It even looks responsible, cutting drawdown by sitting out the worst bear markets.
The Golden Cross · BTC
+506%
$1,000 → $6,061 vs $9,830 holding
Beat buy & hold
5 / 10
a coin flip
Out-of-sample
6 / 10
held up in recent years
Simulated on real historical prices, fees included, and past results are not the future. See how we grade →
02 The one line that ends it
No edge
The Golden Cross vs. doing nothinglog scale
The strategyBuy & hold (doing nothing)
The Golden Cross beat holding on 5 of 10 majors — and 6 of 10 out-of-sample. Same money, same window, fees included — measured against simply buying Bitcoin once and never touching it.
03 The evidence
| Coin | Trades | Win % | Strategy | Buy & hold | Verdict |
|---|
| BTC | 6 | 67 | +506% | +883% | lost |
| ETH | 6 | 67 | +726% | +668% | beat |
| BNB | 7 | 57 | +2347% | +2380% | lost |
| SOL | 6 | 33 | +572% | +238% | beat |
| XRP | 9 | 33 | +33% | +399% | lost |
| LINK | 7 | 29 | −32% | −17% | lost |
| LTC | 8 | 25 | −53% | −22% | lost |
| DOGE | 5 | 40 | +2698% | +875% | beat |
| ADA | 6 | 50 | +269% | +23% | beat |
| AVAX | 6 | 33 | −76% | −80% | beat |
Beat holding on 5 of 10 coins — and on 6 of 10 in the recent out-of-sample period (the honest test that separates a real edge from a bull-market coincidence).
04 The other direction — what if you also shorted?
The headline test sits in cash when it is not long. The fair question is whether trading both ways helps — so we ran the identical rule with the flat side flipped to a 1x short (still no leverage), same fees, same ten coins.
| View | BTC $1k→ | Median return | Median maxDD | Beat hold | Verdict |
|---|
| Long / flat · headline | $6,061 | +506% | 79% | 5/10 | No edge · coin flip |
| Long / short 1x · illustrative | $1,580 | +58% | 97% | 1/10 | Failed out-of-sample |
Trading it both ways was worse on the headline test — median return +387% → +11%, worst drawdown 79% → 97% and the verdict fell from no edge · coin flip to failed out-of-sample. And that is before funding: a short is not spot, it needs a derivative that pays borrow/funding (~10–30%/yr) this omits — add a realistic 20%/yr and the median return drops to −64%. Shorting a market that mostly went up is a wrecking ball, not a rescue.
Why the short side is illustrative
You cannot short on spot — it needs a derivative (a perpetual or margin), which is why the headline test is long/flat. These short figures are shown at 1x with no funding or borrow cost, so the real-world version is worse than what you see here, not better. The window is also net-bullish; the short side only pays in a sustained bear, and betting on that is a different strategy entirely.
05 Verdict
The most famous signal in trading beat simple buy-and-hold on only half the coins tested — a coin flip you pay fees to make. A handful of trades over seven years, to feel like a technician while underperforming a benchmark you cannot tell apart from luck.
Method — the headline test is long/flat spot, no leverage (the long/short view above is a 1x illustration, funding excluded) · a signal read at the daily close is filled at the NEXT close (a full bar of lag — no look-ahead) · 0.06% fee each side, buy-and-hold charged one entry fee too · each coin over its available Binance daily history with warm-up · out-of-sample = held-back most-recent ~45% of each coin's data (a recency holdout, not rolling walk-forward). Honest limits: the ten coins are today's majors (survivorship bias) and are correlated, so “beat on N of 10” is not N independent tests. Reproducible.
The honest other side
It is not useless, just mis-sold. It genuinely cuts drawdown — it sits out the deepest bears. If you want a smoother ride and can stomach missing the sharpest recoveries, that is a real, modest property. Just do not call it an edge, and do not expect more money: you will usually get less.
06 Your turn
That was the textbook version.
We tested it exactly as it's usually described. Yours is probably a little different — a tweak to the settings, an added filter, a different exit. You don't need to code any of it: just describe your version to Vera, our assistant, in plain English, and she builds it and runs it through this same honest test. Most don't survive. A few do — we've proven that. Worth knowing which yours is.
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full report + code
Coming soon
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