What framework did Google and Apple develop collaboratively for national tracing apps?

Answer

Exposure Notification Express (EN Express)

The Exposure Notification Express (EN Express) system was the standardized, privacy-preserving framework collaboratively developed by Google and Apple. This system served as the foundational technological base upon which many national contact tracing applications were built during the global response to the pandemic. Its primary goal was to leverage Bluetooth Low Energy (BLE) technology to log proximity events anonymously, thereby addressing significant public concerns related to location tracking via GPS.

What framework did Google and Apple develop collaboratively for national tracing apps?
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