Everyone quotes the Bitcoin–Nasdaq correlation. Almost nobody watches for the moment it breaks. This page runs a regime machine over the rolling correlation — married, drifting, divorced — and keeps a dated ledger of every separation, with the market conditions measured at each one.
Updated 19 September 2026 · 03:21 UTC · Prices as of 19 September 2026 · Source: daily prices from Yahoo Finance — bitcoin, the Nasdaq-100 fund, and the VIX "fear gauge"
Current status: DRIFTING
The gauge reads the 60-day rolling correlation of daily returns — correlation being a score from −1 (the two always move in opposite directions) through 0 (no connection) to +1 (they always move together). Above 0.45 the two are married; below 0.10 they are divorced; the band between is the drift. Hysteresis means the label needs real evidence to change — one odd week does not file the papers.
DRIFTING
DRIFTING for 21 trading days
State changes require crossing both an entry and an exit threshold (married ≥ 0.45, exits < 0.35; divorced ≤ 0.10, exits > 0.25). Correlation measured on paired daily log returns over Nasdaq trading sessions only.
30-day+0.21
Charlie's readThe fast read — it reacts first and lies often. Right now it says +0.21, so over the last month bitcoin has been loosely tied to the Nasdaq — connected, but with a mind of its own. It sits below the slower 60-day line, so the relationship is cooling.
60-day+0.22
Charlie's readThis is the number that drives the gauge and the married/drifting/divorced label. At +0.22, bitcoin is loosely tied to the Nasdaq — connected, but with a mind of its own — which is why the detector says DRIFTING.
90-day+0.33
Charlie's readThe slow trend underneath. At +0.33 it confirms the 60-day read — this regime has real depth, not a one-week mood swing.
Breaks on record1
Charlie's readThat is how many times in three years the 60-day correlation fell through 0.10 and stayed there for at least three trading days. Breaks are genuinely rare — whatever state the gauge shows now has historically been sticky.
Charlie's read · the regimeBitcoin is half-listening to the Nasdaq — connected, but increasingly driven by its own story. Historically this band resolves toward one extreme or the other within weeks. The label has held for 21 trading days, and the machine only changes its mind after real evidence — so treat it as the honest state of the relationship as of 19 September 2026, not a forecast.
The relationship, day by day
Three windows of the same rolling correlation. Shaded bands mark the divorced episodes — watch how the fast 30-day line leads the regime machine into and out of each break. The lower panel is the VIX over the same stretch.
30-day60-day90-dayDivorced episode
Every break on record
Each row is a divorced episode: contiguous trading days where the 60-day correlation fell through 0.10 and stayed low. Conditions are measured, not narrated — VIX at the break, VIX the week before, and what each asset did during the separation.
Break start
Reconciled
Days apart
Lowest corr
VIX at start
VIX week prior
BTC during
QQQ during
2023-12-13
2024-05-22
162
-0.12
12.2
12.6
+51.1%
+13.8%
Do breaks telegraph themselves?
We tested the simplest suspect: equity volatility. For every recorded break we took the average VIX in the week before it started, and compared it with every other week in the sample. The numbers, not a story:
VIX, week before breaks12.9Mean weekly VIX in the 7 days before each divorced episode began.
Charlie's readBefore past break-ups, the stock market's fear gauge averaged 12.9.
VIX, all other weeks17.4Mean weekly VIX across the rest of the 3-year sample.
Charlie's readIn ordinary weeks it averaged 17.4. The gap between 12.9 and 17.4 is negligible or backwards — spiking fear did NOT reliably warn of past breaks.
Breaks preceded by VIX > 200%Share of break episodes whose prior week averaged above 20.
Charlie's read0% of past breaks were preceded by a fear reading above 20 — the level traders treat as 'elevated'. So elevated fear is not a reliable warning — breaks arrived from calm markets too.
The bottom line
Everything above, compressed into plain English: what the detector says right now, what Charlie watches next, and what would prove the whole idea wrong.
Charlie's read · 19 September 2026 · 03:21 UTCAs of 19 September 2026: bitcoin and the Nasdaq are DRIFTING — the 60-day correlation reads +0.22, it has held for 21 trading days, and 1 full break(s) are on the three-year record. Bitcoin is half-listening to the Nasdaq — connected, but increasingly driven by its own story. Historically this band resolves toward one extreme or the other within weeks. What Charlie watches next: which side of the band the 60-day line exits — back above 0.45 means remarriage, below 0.10 means a full break. And the early-warning test: fear (VIX) averaged 12.9 in the week before past breaks versus 17.4 in ordinary weeks, so spiking stock-market fear did not telegraph the splits. What would prove the detector wrong: the label flipping back and forth on noise, or long stretches where bitcoin and the Nasdaq visibly move together while the gauge still says divorced — either means the thresholds, not the market, are doing the talking.
For the statistically curious
The full plumbing — exact data definitions, the regime machine's rules, and honest limitations. Nothing below changes a number above; it only explains how the numbers were built.
Methodology, data sources and limitations
Method. Daily closes for bitcoin, the Nasdaq-100 fund (QQQ) and the VIX volatility index from Yahoo Finance, 3-year window, export timestamped 19 September 2026 · 03:21 UTC. Bitcoin's close is carried onto Nasdaq trading days (never the reverse), daily log returns are paired, and Pearson correlation rolls over 30/60/90-day windows. The regime machine reads the 60-day window with hysteresis (enter married ≥ 0.45, exit < 0.35; enter divorced ≤ 0.10, exit > 0.25). An episode is a contiguous divorced run of at least 3 trading days.
Limits. Three years is one macro cycle, not a law of nature. QQQ is the tradable Nasdaq-100 proxy, not the Composite. Correlation of daily returns misses intraday coupling and weekend crypto moves. The VIX lead test is univariate and descriptive — a difference in means is not a forecasting model, and 1 episodes is a small sample. Missing data is never treated as zero; if a feed fails, the page says so instead of printing a number.
