A rare bullish signal on Bitcoin's chart just triggered, and every past instance led to gains a year out — good news for long-term holders.

• The cross happened on October 3 and has now appeared eight times in Bitcoin's history.
• All eight previous times, Bitcoin was higher 12 months later.
• The typical gain a year after the signal has been 144%.
• This signal has shown up more often than the better-known golden cross and has had bigger long-term results.

Outlook: The one-year view is firmly bullish, though the sample size is small enough that it is no guarantee.