τι ειναι το bitcoin και πως λειτουργει
http://emilianoeplm020.iamarrows.com/15-most-underrated-skills-that-ll-make-you-a-rockstar-in-the-archike-time-bitcoin-industry
Bitcoin is an electronic currency which runs without any type of main control or the oversight of financial institutions or governments. Rather it relies on peer-to-peer software program as well as cryptography.