In short, we don't collect data about who you are, where you go, or who you're near. With the Covid Watch App, your phone periodically sends out what we call Bluetooth chirps, essentially saying to nearby phones, “Hey, I'm here!” If another phone is nearby chirping, “Hey, I'm here too,” both phones will log the interaction and store it for 2-4 weeks right there inside your device. After 2-4 weeks, the interaction is permanently deleted.
If you are diagnosed with COVID-19 , you can choose to share your test results with Covid Watch after they are verified by local health officials. Once you do that, you input a random number into Covid Watch. Immediately, other devices that have recently heard your phone’s Bluetooth chirps will be alerted to a positive result. The alert contains no personal information and no locations. If a hacker broke into Covid Watch, they would just find a bunch of random numbers.