bitcoin για αρχάριους
https://wiki-spirit.win/index.php?title=9_Things_Your_Parents_Taught_You_About_ΤΙ_ΕΙΝΑΙ_ΤΟ_BITCOIN
Bitcoin is a digital currency which operates free of any main control or the oversight of financial institutions or governments. Rather it depends on peer-to-peer software program as well as cryptography.