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The checked observation does not show the condition described above, or the measurement is unavailable. A missing measurement is inconclusive.
← All detection signalsDETECTION SIGNALEXPLANATION01 EXPECTED RESPONSE 02 POSSIBLE ANOMALY
PerimeterX Canvas Noise Variance
A closer look at the browser, network, or interaction evidence behind this signal.
What we test
PerimeterX reverse-engineered check: Repeated 2D canvas draws of an identical geometric shape produced varying hash outputs across frames.
Why it matters
This observation provides context for reviewing a session. Assess it alongside other independent evidence and the conditions under which it was collected.
How to interpret the response
Bot-managed browser
The condition described above may appear in an automated or proxied session. It can also have legitimate causes and needs corroboration.
Browser versions, device settings, extensions, accessibility tools, and network conditions can affect results. These examples are illustrative, not a specific visitor record.