Hi Patrick,
Sorry for the speculation - I should have disclosed it better as guesswork.
I was not trying to head anywhere either, but rather track the problem back to where it comes from in the first place.
These DSA signatures to verify tickets date back to the external ITS times, which at the time was called "the portal" in projects I was involved in. Hence I made a connect to the ITS.
Of course the DSA is widely used in other areas now as well and there is no external ITS anymore (bar the installations still out there).
I guess the curious folks will have to wait the 90 days grace period (or most likely longer in this case).
Cheers,
Julius