COVID - 19 app

The government and NHS have released their new Covid-19 app. After their disastrous trial on the Isle of Wight, it can be assumed that things have been ironed out enough to roll out for general release. It works via Apple's/Googles Covid-19 API which allows phones to handshake each other over Bluetooth. This API is only provided to healthcare authorities so other app developers aren't able to exploit it to make other apps. It takes the much talked about de-centralised approach to contact tracing, meaning that in theory, the app developer/government wont know which users have been in contact. Countries trying to do the centralised approach have been struggling as Apple refused to let app developers meddle with the Bluetooth settings so have had to adopt this de-centralised approach. Below is the rough blueprint of the two systems.