I don't think that's true. "Laundering" cash means making declaring fraudulent income from a business to make the cash income look legitimate. From the perspe

I don't think that's true. "Laundering" cash means making declaring fraudulent income from a business to make the cash income look legitimate. From the perspective of the tax authorities, it doesn't matter whether you have the "same" 100 ETH you had on Thursday, the question still remains whether you have undeclared income. This is more like... depositing hundred dollar bills at a bank, and then withdrawing different ones from an ATM.