In Europe, privacy is a high value asset. For this reason, Bluetooth Low Energy (BLE) has been identified as a possible technology to anonymously track contacts. This energy-saving technology is not only built into smartphones, but also into all other smart devices. Those devices permanently receive BLE signals. In contrast to classic Bluetooth, where the devices first have to be paired, BLE technology uses so called beacons. Their signals can be received by all BLE devices.
Contact tracing apps use exactly this technology. Every app user permanently sends out beacon signals and the devices in immediate vicinity receive them. Since each beacon also sends along an anonymous ID (EphID), it is easy to record which smartphones have encountered each other. With BitsaboutMe, you can then see how many beacons were captured by your smartphone, when and where.