Daily research · The economy and Wall Street · written
What does Bitcoin do the day after a Bitcoin difficulty adjustment?
Short answer
206 cases since 2019: in the middle one, Bitcoin moved −0.12% the day after a Bitcoin difficulty adjustment. It ended lower 52% of the time. One case in 10 did better than +4.6%, one in 10 worse than −5.4%. Over 206 days set against ordinary days it is no clear edge. Not tested out of sample yet.
Typical move
−0.12%
the next day, the middle case
How often
52%
it ended lower
Best 1 in 10
+4.6%
or better
Worst 1 in 10
−5.4%
or worse
Cases
206
2019-2026, on 206 days
Higher 48% of the time against 53% on ordinary days (206 days compared): no clear edge over ordinary days.
Share on Xcopy link§ 01 · The pattern206 cases
The pattern, exactly
as of · the rule, the data, the dates
A case is the day of one of Bitcoin's mining difficulty adjustments (mempool.space), and the move that counts is Bitcoin's.
Each of the 206 moves is measured from the close before the event's day to the close 1 day after that day.
In our data that gives 206 measured cases on 206 separate days, from Jan 14, 2019 to Oct 16, 2026; the numbers were written on Oct 19, 2026.
§ 02 · Why it might work
Why it might work
as of · the idea traders have in mind, not a promise
Bitcoin's mining difficulty resets about every two weeks. A big change shifts miners' costs and income, and some traders watch for miners adding coins to the market, or holding back, around it.
That is the reasoning behind watching difficulty resets; whether it held over our 206 cases since 2019 is what the next sections measure.
§ 03 · How we tested it
How we tested it
as of · our own closes, against ordinary days
- Every one of the 206 cases is measured from the close before the event's day to the close 1 day after that day, on our own daily closes (UTC).
- Each case is set against Bitcoin's own ordinary days (1-day moves starting in the 365 days before it, at least 90 of them), and 206 of the 206 days had that many to compare.
- No two cases share a day, so each of the 206 days counts once.
§ 04 · Results74 up · 77 down
Results
as of · every past case, Jan 14, 2019 to Oct 16, 2026
Of the 206 cases, 74 ended up, 77 down and 55 sideways (within ±1.0%) a day later; the middle case −0.12%, the average day −0.10%.
ended up (74)ended down (77)sideways, within ±1.0% (55)each line one real case · past cases, not a projection
1, 7 and 30 days against ordinary days
| After | Cases | Typical move | Typical, ordinary days | Higher | Higher, ordinary days | Against ordinary days |
|---|---|---|---|---|---|---|
| 1 day this post | 206 | −0.12% | +0.16% | 48% | 53% | no clear edge over ordinary days |
| 7 days | 205 | +0.27% | +0.56% | 53% | 54% | no clear edge over ordinary days |
| 30 days | 203 | +2.4% | +2.6% | 56% | 55% | no clear edge over ordinary days |
At the other horizons: 7 days, typical +0.27% over 205 cases; 30 days, typical +2.4% over 203 cases.
By year, the typical move ranged from −1.5% in 2022 to +1.2% in 2020; 5 of 8 years leaned the same way as the whole.
Year by year
| Year | Cases | Typical move | Higher | Lower |
|---|---|---|---|---|
| 2019 | 26 | −1.1% | 38% | 62% |
| 2020 | 27 | +1.2% | 59% | 41% |
| 2021 | 26 | +1.0% | 58% | 42% |
| 2022 | 26 | −1.5% | 42% | 58% |
| 2023 | 27 | −0.02% | 48% | 52% |
| 2024 | 27 | −0.19% | 41% | 59% |
| 2025 | 26 | −0.39% | 38% | 62% |
| 2026 | 21 | +0.36% | 57% | 43% |
The latest 10 cases
| Day | Coin | What happened | 1 day | 7 days | 30 days |
|---|---|---|---|---|---|
| BTC | Bitcoin mining difficulty +5.92% | −0.92% | open | open | |
| BTC | Bitcoin mining difficulty -0.03% | +2.4% | −1.8% | open | |
| BTC | Bitcoin mining difficulty +4.16% | +0.36% | +4.4% | open | |
| BTC | Bitcoin mining difficulty +1.31% | +0.85% | −3.0% | +7.7% | |
| BTC | Bitcoin mining difficulty -1.31% | +2.5% | +0.79% | +11.8% | |
| BTC | Bitcoin mining difficulty +0.99% | −0.03% | −2.8% | +21.9% | |
| BTC | Bitcoin mining difficulty -0.74% | +2.0% | −2.1% | +23.2% | |
| BTC | Bitcoin mining difficulty -5.00% | −0.60% | +1.0% | −0.30% | |
| BTC | Bitcoin mining difficulty +7.15% | −0.87% | +5.1% | +6.1% | |
| BTC | Bitcoin mining difficulty -10.09% | +2.9% | −1.8% | +0.91% |
Source: our daily closes and our dated events, measured on .
§ 05 · Out of samplenot tested out of sample yet
Out of sample
as of · calls like it, scored on data they never saw
Not tested out of sample yet: the lab has not scored calls made from difficulty resets at 1 day, so the 206 cases above describe the past and are not a prediction.
§ 06 · Verdict
Verdict
as of · plain, with the caveats
No clear edge: 48% of 206 days ended higher against 53% on ordinary days, inside the range chance alone gives (41% to 54%).
The typical move of −0.12% is small next to the spread between the best and worst 1 in 10 (−5.4% to +4.6%): single cases went either way by far more.
Calls made from difficulty resets have not been tested out of sample yet, so read these 206 cases as a description of the past, not a forecast.
Markets change, so what difficulty resets did from 2019 to 2026 can stop working.
§ 07 · Questions
Questions
as of · answered from the numbers above
- How often did Bitcoin end lower the day after a Bitcoin difficulty adjustment?
- In 52% of 206 cases from Jan 14, 2019 to Oct 16, 2026.
- Measured the scoreboard's way, day by day, the share higher was 48% against 53% on Bitcoin's own ordinary days.
- What was the typical move?
- The middle case moved −0.12% the next day.
- The best 1 in 10 reached +4.6% or more and the worst 1 in 10 −5.4% or less.
- Can you trade on this?
- Not on its own: over 206 cases it shows no clear edge over ordinary days, and it has not been tested out of sample yet.
- The −0.12% typical move is the past's, and a past pattern can stop working.
- When did it last happen?
- The latest was on Oct 16, 2026: Bitcoin mining difficulty +5.92%.
- A day later the move was −0.92%.
- Did it work the same every year?
- No. The typical move was +1.2% in 2020 (27 cases) and −1.5% in 2022 (26 cases).