The study is focused on the science of ultrasound cross-device tracking (uXDT), a new technology that started being deployed in modern-day advertising platforms in 2014. The technology relies on advertisers hiding ultrasounds in their ads that get picked up by the microphone of nearby second-stage devices such as laptops, desktops, tablets, or smartphones. The devices interpret the ultrasounds, which contain hidden instructions for pinging back to the advertiser's server with details about that device.
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