AliExpress wasn't recording users but instead playing a silent sound and measuring how users' specific devices processed it in order to fingerprint them.
Brave's post exposes AliExpress using silent WebAudio API graphs with oscillators and analyzers to fingerprint devices via subtle audio processing differences, as part of broader tracking scripts.
The technique was uncovered when a user's Bluetooth headphones stayed locked to their PC because AliExpress kept audio contexts active, even with zero gain preventing sound output.
Brave counters this and other fingerprinting methods by default with randomized audio output data, session resets, and specific script blocks, with added recent GPU protections.
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