Outputs per Transaction (P90) shows the 90th-percentile output count of Bitcoin transactions on a given day. Ninety percent of transactions created this number of outputs or fewer, so the series isolates the high-output tail rather than the center of the distribution.
A rising P90 means more complex output structures are becoming more visible near the top end of the daily transaction set. If P90 rises while the median stays flat, the shift is concentrated in the tail. It is most informative with Average Outputs per Transaction and Median Outputs per Transaction.
The main caveat is that P90 is not a read on typical behavior. It can rise sharply even when most transactions are broadly unchanged, because the upper tail is stretching. That is exactly why it belongs beside the average and median rather than replacing either one.
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