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The w4rn blog

Plain-language guides to reading crypto market risk — drawdown, volatility regimes, AUC, calibration and the macro backdrop. Risk education, not trading advice.

Is crypto more volatile on weekends? Bitcoin's record says no

Since 2017, bitcoin moved about a third less on weekends than on weekdays, in every year and for all 25 coins we track. The numbers and the likely reasons.

10 October 2026 · 5 min read

How long do bitcoin bear markets last? What the last two took

Bitcoin's last two bear markets fell for about a year (364 and 378 days) and took 1,074 and 847 days to regain the high. The record, and where 2026 stands.

10 October 2026 · 6 min read

Bitcoin drawdown history: every fall of 20% or more since 2017

Ten times since 2017 bitcoin fell 20% or more below a previous high. The two deepest took 1,074 and 847 days to recover. The full record, with the maths.

28 September 2026 · 5 min read

Does the Fed rate predict crypto risk? Mostly it tells you what year it is.

Fed funds rate vs bitcoin drawdown risk: AUC 0.414 over 3,312 days — the furthest below a coin flip in this series, as if hikes were safe. Split by year it swings from 0.346 to 0.661, and the swings are the calendar, not the Fed.

13 September 2026 · 6 min read

Does gold predict crypto risk? First it would have to pick a side.

Gold scores 0.537 against bitcoin drawdown risk over 2,280 days — and the pooled number hides a sign that has flipped twice in ten years. 0.342 in 2019, 0.614 in 2020, 0.329 in 2021, 0.610 in 2023.

6 September 2026 · 6 min read

Does the VIX predict crypto risk? The year it should have worked is the year it scored worst.

Scored out-of-sample against bitcoin drawdown risk over 2,281 days, the VIX lands at 0.490 — a coin flip pooled and a coin flip year by year. In 2022, when the two crashed together, it scored 0.405.

23 August 2026 · 6 min read

Does a strong dollar predict crypto drawdowns? Four years say yes, six say no.

The DXY scores 0.451 against bitcoin drawdown risk over 2,281 days. It worked in 2019, 2020 and 2025 — and scored 0.381 in 2022, the year the dollar hit a twenty-year high while bitcoin lost two-thirds of its value.

23 August 2026 · 6 min read

We scored the Crypto Fear & Greed Index. Over eight years it's a coin flip.

The most-watched sentiment gauge in crypto, scored out-of-sample against bitcoin drawdown risk over 3,142 days. Pooled 0.527, average of the years 0.485, and its best year is the most recent one. Here is the full record.

23 August 2026 · 6 min read

What calibration means — and why a good 30% forecast usually doesn't come true

A calibrated model's 30% means 30%. What calibration is, how it differs from ranking skill (AUC), and how to judge a probability forecast fairly.

16 July 2026 · 5 min read

Reading the macro backdrop: describing crypto risk is not predicting it

Credit spreads, the dollar, rates and sentiment describe the world crypto trades in. Whether any of them warns you ahead of time is a separate question.

27 June 2026 · 5 min read

Why you can't predict crypto's direction — but you can read its risk

Direction is close to a coin flip; magnitude and risk are not. Here's why that distinction is the whole point of a risk tool, and how to trade with it.

26 June 2026 · 4 min read

What AUC means — and why we put it next to every forecast

AUC is a one-number score of how well a model separates risky from calm. Here's what it means in plain language and why an honest tool always shows it.

25 June 2026 · 5 min read

Volatility regimes explained: knowing when to brace

Markets switch between calm and stormy regimes. Learn what a volatility regime is, why magnitude is more forecastable than direction, and how to use it.

23 June 2026 · 4 min read

What is drawdown risk — and why it matters more than price predictions

Drawdown risk is the chance of a sharp drop from here. Here's what it means, why it's more useful than a price target, and how to read it before you trade.

20 June 2026 · 4 min read

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w4rn — a risk-awareness cockpit for crypto. Built on free and open data. Not financial advice.