The first version of the COVID-19 contact tracing system that's being developed by Apple and Google is expected to be available to developers next week - on April 28.
Although Bluetooth-based smartphone contact tracing is untested technology and early results in countries like Singapore are modest, its development is already redefining the relationship between the state and individual. The companies are now calling the technology Exposure Notification, a term they said more accurately describes the functionality.
Readings (of where you are and where other people are) will be taken every five minutes and capped at 30 minutes per pairing, while various other tweaks should improve the draw on battery life and the accuracy of these apps.
"The federal government has great trust in the system that is being tested by Fraunhofer", government spokeswoman Ulrike Demmer told a news conference.
As per the new specification, the solution will have a new encryption system in which daily tracing keys will be randomly generated rather than mathematically derived from a user's private key.
Apple and Google previously said that governments would not be allowed to mandate use of their technology. It includes provisions to maintain user privacy without diminishing effectiveness.
World Health Organization announces €7.5 billion programme to tackle coronavirus pandemic
He warned that the African continent was "extremely vulnerable to the ravages of this virus and is in need of support". The programme - and its 7.5 billion euro (£6.5 billion) fundraising effort - will be officially launched on May 4.
Apple and Google also announced that they intend to shut the tracking tool down once the pandemic is over, and will do so on a region-by-region basis.
Other phones will be listening for these beacons and broadcasting theirs as well.
Namely, Bluetooth metadata - sometimes containing small details that can re-identify a device - will be encrypted.
The app keeps an anonymous record of all these logs securely on a user's phone.
The announcement comes with health agencies around the world scrambling to develop apps that use the wireless Bluetooth technology in smartphones to help track the spread of the disease by detecting when someone has been in proximity to an infected person.
"If at some point a user is positively diagnosed with COVID-19, he or she can work with the health authority to report that diagnosis within the app, and with their consent their beacons are then added to the positive diagnosis list", the companies said. This system does not collect location data from your device and does not share the identities of other users to each other, Google or Apple.
"The user controls all data they want to share, and the decision to share it", they said.