Within the next 3 to 4 hours both the 50 hourly and 100 hourly moving averages are going to cross below the 200 hourly moving average.
In stocks we usually look at the 1 day chart (50-100 ma) for a death cross but given bitcoin's wild volatility we need to move down into lower time frames to be accurate. hence the 1 hour time frame.
This could potentially trigger a larger sell off.