A Olusanjo Omoniyi
Immigration AttorneyThere are two sources that must be proven. First, you need to address the issue of how you to buy/acquire those Bitcoins, when and where you bought those Bitcoins, how you paid for the purchase, provide of how much you paid, etc. Secondly, Bitcoins are usually converted (sold) to hard currency, you should provide all necessary documentation associated with the sale such as the name of purchaser, how Bitcoins were sold, the amount realized, compliance with laws of the jurisdiction where the sales took place including payment of appropriate taxes, compliance with appropriate securities laws. Advisably, consult legal and other experts associated with Bitcoins who can help assemble relevant documentation.