Bitcoin briefly crossed $84,000 Monday, its first trip to that level since January 31, and changed hands at $83,869 at last check, up 3.18% on the day. The move liquidated $262.30 million of short positions in a single hour, according to CoinGlass. That is the five-week ceiling in the low $80,000s finally breaking, the same zone that rejected price four times between late August and early September.