When you place a buy order, the money is automatically moved from your IBIE brokerage account and transferred to zerohash. If you are buying crypto-assets and the purchase price is in a currency other than the currency in your brokerage account, IBIE will automatically convert your currency into the purchase currency through carrying out an FX spot transaction and you will be charged the usual commissions for that transaction.
Trading, settlement and custody services in connection with crypto-assets through IBKR platforms are provided by zerohash europe B.V.