Detection approach
AudioContext sampleRate is a non-standard frequency (not 44100, 48000, or 96000 Hz). Non-standard sample rates indicate virtualized or emulated audio subsystems (e.g., PulseAudio bridges, VM audio emulation).
How this helps detect bots
Collect this signal alongside session context, request metadata, and other independent indicators. A single anomaly is a lead, not a verdict; corroborating anomalies make automated traffic more likely.
Legitimate traffic to consider
Audiophile users or developers configuring sound interfaces to custom studio sample rates.
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