This topic should be moved from the currency exchange section.
why? it's to alarm users that some coins might be dirty
I mean I can see why it's off topic here but still it's related
e: some coins on some exchanges.
indeed it should be moved to the discussion board.
This board is only for
Currency Exchange.
Regarding your comment, if you receive indeed these "dirty" coins from some exchanges, it's only the responsibility of the exchange, as you could proof anytime where you got the coins from.