BC Vaccine Passport Data Format

I also like the fact that the QR codes can be verified offline. The question I have is just because it can be done without sending data will the "BC vaccine verifier app" work this way or will it transmit the data anyways?

I am concerned that the data will be collected under the guise of future contact tracing, the eventually be use by other government agencies such as the CRA to target non covid issues such as cash declarations and taxing service workers tips.

I would think an offline, third party(non government), premium app that allows service providers to comply with the mandate would be a profitable venture.