Added address verification when sending cryptocurrency

Added an additional check when generating a wallet address for cryptocurrency. Now, when a client sends a cryptocurrency (when generating an address – proceeding to payment), an additional letter is sent with the generated address. This is required so that customers can check the address of the exchanger when sending cryptocurrencies in their browser and in the mail. The addresses must be the same. There was a need for this, because. there are cases when the client’s computer may have software (in browser plug-ins, installed programs) that replaces crypto addresses in the browser on the fly. Be vigilant, check addresses. Happy exchanges.