A long-term momentum signal on Bitcoin is turning back up, and the past four times it did, big gains followed — bullish for holders.

• Bitcoin's monthly momentum indicator is flipping back to positive after a long stretch of weakness.
• Every previous time this happened, prices rose — four for four.
• Past cases gained about 30% within a month, nearly 80% over six months, and roughly 145% over a year.
• The setup is a historical pattern, not a promise, and this run could easily be weaker than past ones.

Outlook: If the pattern holds, October starts a strong stretch for Bitcoin, but the sample is small and nothing is guaranteed.