Remarks on CrowdNotifier

[koalyorg]

Hello,

When reading the CrowdNotifier white paper I had a few ideas which I wanted to share:

First I wondered how the time frame is traced. It seems that there are two QR Codes (entry and exit). For convenience this seems very complicated if you have any open space with not a single entry and exit. What would be about adding a range to the QR Code and letting the device use GPS (locally) to track when the range is left.

One of the biggest obstacles in contact tracing seems to be that not all users have or want to use digital solutions. Therefore it seems important to build some kind of bridge between these. This could be the option for stuff instead of collecting paper scanning the qr code and then taking a picture of the paper. This could be encrypted with the public key of the health authorities and only released upon request.

For a digital solution step 3 seems quite analog. Upon receiving a test result the user should mark the QR Code. For example in the german "Corona-Warn-App" after a COVID-19 test you receive a QR Code which can be entered in the app. The result of the test is shared over the app and potential contacts can be informed. In this solution this could mean that the other digital users get a notification and the owner too who then shares the contact list.

In addition it seems that the NHS COVID-19 is using a similar approach to the proposed one of CrowdNotifier already. I'm not aware if there are any experiences which could be reffered to.