τι ειναι το bitcoin και πως λειτουργει
https://wiki.3cdr.ru/wiki/index.php/10_Secrets_About_Αρχικη_τιμη_bitcoin_You_Can_Learn_From_TV_58742
Bitcoin is a digital currency which operates without any kind of central control or the oversight of financial institutions or federal governments. Rather it counts on peer-to-peer software application as well