The design of this code seems bad...
It should encode:
https://covidcheck.gov.eu/87HS84JU8179
The URL, when visited by browser should display a big green tick or cross. The page should contain all the machine parsable metadata. The URL itself should have a check digit to allow low-security offline checking, although for cases where falsification is an issue, online checks should be required, since there is no good way to revoke offline codes.
The substantially shorter code will read much more easily and be smaller to print. It can be verified or generated without any special software.