The Covid App in New Zealand doesn't use the bluetooth apple/google method. Rather, it is based on QR codes that are printed and posted by every business. I wa

The Covid App in New Zealand doesn't use the bluetooth apple/google method. Rather, it is based on QR codes that are printed and posted by every business. I was initially pretty disappointed in this approach, but I have changed my mind, and now agree with Cory Doctorow, and the New Zealand method. The app just keeps a (local, temporary) diary of when/where you check in. That's pretty much it. If you talk to a contact tracer, you can send them your diary as a way to augment other sources of information: Your memory, your bank statements, your transit card info, etc. I was disappointed with the app because I thought there was no way it would be effective as a complete contact tracing solution. I now understand that of course _no_ app could do that. Better to have something modest that fits nicely into a wider strategy.