A trading signal that has called every major Bitcoin bottom since 2014 just flashed again — a bullish sign for long-term buyers, though history says the real low comes a bit later.

• Bitcoin just triggered a "strong buy" signal on the weekly chart as of last week's close.
• This same signal appeared at the major lows in 2014-2015 and 2018.
• Each time, the actual bottom came about 20% below where the first signal fired, over the following months.
• So the signal marks the start of a bottoming zone, not the exact low — expect more downside before the turn.

Outlook: If the pattern holds, Bitcoin could slip roughly 20% further over the coming months before setting a lasting bottom.