Bitcoin is the most popular cryptocurrency in the world. OKPay is an aspiring web-based payment system, an alternative to PayPal, especially for merchants. The reason why it is so popular among bitcoin traders is because the transactions are irreversible. So why not combining both services? A well known crypto exchange where people can buy bitcoin is LocalBitcoins.com. If you want to purchase coins directly in OKPay, you can do so as well: The function can be found in the navigation under Withdrawal. I describe the method in detail on my blog. http://money.schendera.com/okpay-bitcoin.html