uXDT Tech allows Ultrasonic beacons from ads to be picked up on smartphone mics and track users! even finding bitcoin users using tor on phones! We should use it for good to help Bitcoin/blockchain!
https://themerkle.com/hundreds-of-android-apps-track-users-through-ultrasound-beacons/
This @themerkle article here discusses this thing called uXDT that,
"Ultrasound cross-device tracking – or uXDT – has become a popular tool among advertisers looking to track users as they switch between devices. In most cases, the ultrasound beacon is embedded within advertisements"
(I have also read about how they can even be used in TV, video, or even billboards and static images can hide the beacons! or they can be embedded into youtube ads or videos etc! or even music! Like the radio or spotify etc!)
the article goes on to say,
"Once the ad plays on traditional or online platforms, it emits an ultrasound picked up by the microphone of nearby electronic gadgets. Laptops, computers, mobile devices, and tablets can all pick up this sound. Any application installed on the device picking up the ultrasound beacon will relay the signal back to the advertiser. This signal confirms said user is the potential owner of the devices linked together by this particular beacon. A very interesting technique to track users, although one that has little chance of success unless the user installs an application on their mobile device capable of sending and receiving such an ultrasound signal. This is where this recent discovery comes into the picture. A total of 234 Android apps has been discovered, all of which contain the necessary SDK to relay these beacons to advertisers. Since Android is by far the largest mobile ecosystem, that outcome is not entirely surprising. The bigger question is whether or not consumers should be aware of this problem, and more importantly, how they can protect themselves from being tracked."
they go on to even explain how it can even be used to track down Bitcoin users even if they are using tor as it will ID their SMARTPHONE physically!
turn this feature OFF on your android phones! dont give random apps access to your microphone! Like MCDONALDS app for example does this and listens for the uXDT signals that humans cant perceive with just their ears!
And the REAL bigger question is how we can use this technology for GOOD to help Bitcoin! maybe an automatic sensing of bitcoin wallets ontop of a QR code like a Audio QR code for cases when cameras cant be used?
I know we can think of MANy uses for this technology to help the blockchain!
