You ' re in for a treat , man . <| sep |> Several countries have done this sort of thing in the past . The basic idea is that they create a new currency to replace the old one or in this case they just do it for certain notes , or so I ' m told and require everyone switch to the new one and that each person explanain how that money was made . Legal income isn ' t supposed to be hard to explain , as income taxes were paid on it . Black market money , income from drugs , corruption , tax evasion etc will be a lot harder to explain . It ' s a way to take illegally earned money that hasn ' t been out of the economy , in other words . Great username btw . <| sep |> Use him to apply but tell him what you told us and ask for his advice how to proceed .