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How can I document cryptocurrencies that I have obtained, for example, by trading on another exchange? What documentation is sufficient in such a case?
In such a situation, it is sufficient to confirm the purchase of cryptocurrencies for FIAT currency on another exchange and to confirm the transaction history that generated the profit deposited into the account with zondacrypto.
Ideally, your trading history on another exchange will allow you to link to your trading data.