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great question! you are right the crypto market is active 24/7! What I meant by "close today" is the daily candle. So each bar on the graph represents 1 day of trading activity in Bitcoin, and at the end of each day it moves to a new bar. If the current bar ends below the uptrend line it would be a negative sign for Bitcoin.

Hmm, I guess it also depends on the timezone you are in.