There are several teams working on better privacy preserving functionality: https://github.com/covid-apps-tracker/tracing-apps https://github.com/covid-apps-tra

There are several teams working on better privacy preserving functionality: https://github.com/covid-apps-tracker/tracing-apps https://github.com/covid-apps-tracker/tracing-apps. What would be useful is a common standard for Bluetooth transmission so all these apps could talk to each other.