Too Long; Didn't Read
When one travels to Iran, the first problem to solve is money. <a href="https://www.treasury.gov/resource-center/sanctions/Programs/Pages/iran.aspx" target="_blank">US sanctions</a> mean Iran is financially isolated. No banks accept international credit cards. Visa and Mastercard can’t operate in Iran. There are no bank transfers, no Paypal; there is not even a Western Union. Foreign visitors, therefore, need to bring cash (euros or dollars) — or bitcoin — and exchange it locally against rials, the local iranian currency.