Hi,
we are not so arrogant to say that we are unhackable, but here it is very likely a scam. The alleged hacker can not submit a single piece of evidence that he really has data from bitcoin.de. We have checked our system and could not detect any unauthorized access.
So if someone really wants to get rid of 10 BTC... Please donate the money to the Wikimedia Foundation
https://wikimediafoundation.org/wiki/Ways_to_Give#bitcoin or to the needy coffee fund of bitcoin.de: 1Ep3PpCs76JfKMjz5vckVTckB3JkSQEjAi
Best regards,
Oliver
CEO Bitcoin.de