Inputs per Transaction (P90) shows the 90th-percentile input count of Bitcoin transactions on a given day. Ninety percent of transactions used this number of inputs or fewer, so the series is the tail-sensitive view of input-side transaction complexity.
A rising P90 means the high-input tail is getting heavier. If P90 rises while the median stays flat, the change is concentrated near the top end of the daily distribution. It is most useful with Average Inputs per Transaction and Median Inputs per Transaction, where the question is whether the whole distribution shifted or the upper tail stretched.
The key limitation is scope. P90 does not describe the typical transaction, and by itself it can overstate how broad a structural change really was. Its value is in isolating upper-end behavior that the average alone cannot locate.
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