Berlin Sparkasse & Bitcoin laws

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self.Bitcoin1m ago
I was wandering if anyone else is in this situation. Say I want to open a new Sparkasse account (have no Shufa whatsoever, not even a Germany tax resident (yet, here on so called §*24* Aufenthaltsgesetz) and then make an FTX wire transfer to it (say, I load FTX with crypto > sell). Self-hosted wallets are hard to track, will they be able to track I held on to that BTC longer than 1 year (not to pay the extra tax). Will they ask for the whole chain of events that led me to have that funds? Puzzled).