And no, it isn't Bill Browder. Instead, the whistleblower is a former Danske Markets trader named Howard Wilkinson, a British executive who was formerly the bank's Baltics trading head. Wilkinson eventually told a Danish newspaper about the fraud, and it went on to blow the lid off the scandal.

Berlingske, the newspaper that first reported allegations that Danske Bank A/S was being used to launder billions of dollars in dirty money, revealed the identity of the whistle-blower who provided much of the information in the case.