BTC, the brightest spot on the heatmap is concentrated in the 75,000 to 76,000 range. When BTC touched 76,000, it directly swept out all the short positions in this area, because many people had their stop losses set in this zone, and they got wiped out in one wave. Looking at the heatmap again now, the "corpses" of the bears around 76,000 have been mostly cleaned out, but moving further up to 78,000, there's another layer of new short defensive positions. Looking downward, 72,000 is actually where the longs have their stop losses, if the price drops down here, it could trigger a chain reaction of liquidations.