Is it permissible to convert a portion of one's salary from a depreciating local currency to a foreign currency to preserve its value, and then sell it at the higher parallel market rate?

It is permissible to transfer money between banks or their branches in different countries using different currencies. The bank's crediting of the amount to the customer's account is considered a constructive possession. It is also permissible to transfer funds in one currency to one party, for them to reach another party in a different currency, provided that the exchange takes place in the same session. The receipt of a check or a remittance slip is considered a constructive possession. If the money arrives, it is permissible to exchange it in the parallel market at a price higher than the official bank rate, provided that the exchange is hand-to-hand.