What is a death cross?
A death cross is the bearish mirror of the golden cross: the 50-day simple moving average crosses below the 200-day SMA. It signals that the medium-term trend has rolled over beneath the long-term trend, and is widely read as confirmation that an asset has shifted from an uptrend or range into a sustained downtrend.
Like its bullish twin, the death cross is slow and deliberate. It will not flag every pullback — by the time the 50-day has fallen under the 200-day, momentum has usually been deteriorating for weeks. Traders value it as a regime marker rather than a timing tool: it tells you the backdrop has turned defensive.
In crypto, death crosses on Bitcoin have historically lined up with the early stages of extended drawdowns, though they have also produced false alarms near local bottoms. That dual nature is exactly why pairing the signal with a back-tested win rate is so useful.