I think most of the bigger stock markets are looking with eagle eyes on what is going to happen with the Bakkt offering and if institutional traders would be keen on investing capital into a highly volatile trading instrument like Bitcoin.
So Germany will be one of the first regulated trading platforms, but it will surely not be the only one.
The German traders are traditionally very rigid, so it will be interesting to see how they adopt this new digital asset in their portfolios.
They are about retail traders ( see BISON APP) , not profs one like Deutsche Börse / EUREX are
I found this one interesting :
"BSDEX offers a technically secure and transparent environment for the trading of digital assets under German Law. The Boerse Stuttgart Digital Exchange is operated as a multilateral trading facility system regulated in accordance with Section 2 (12) of the German Banking Act (KWG)"
they state that they abide by the german laws , I am not sure wherever there is a section regulating cryptocurrencies
also Solaris bank
https://www.solarisbank.com/en/ is not one of the largest banks , not in the top 20 for sure :
https://www.relbanks.com/rankings/top-banks-in-germanythis is , probably , just an experiment rather than a solid project, but well worth monitoring as it could pave the way for others ( if it lives )