Thank you Thomas for reading my article and for your feedback, it is appreciated!

In fact, I created GitTrustedTimestamps exactly for the purpose of having a data archive that conforms to GeBüV requirements.

AFAIK, there is no such thing as an officially recognized (or required) GeBüV certificate.

However, there are private companies that perform an audit and issue such certifications in order to give firms which implement or use such an archive (either in-house or as product) confidence that their solution corresponds to GeBüV (and other) requirements, by providing a 3rd-party expert opinion.

I'm currently in the evaluation process of getting such a certification for this open-source solution.

Any expert input on the matter is highly welcome, so please don't hold back! :)