http://www.wsj.com/articles/the-revolutionary-power-of-digital-currency-1422035061

https://bitcoin.org/en/how-it-works

http://venturebeat.com/2014/02/17/bitcoin-for-idiots-an-introductory-guide/

https://www.khanacademy.org/economics-finance-domain/core-finance/money-and-banking/bitcoin/v/bitcoin-what-is-it

http://netforbeginners.about.com/od/b/fl/What-Are-Bitcoins-How-Do-Bitcoins-Work.htm

https://www.youtube.com/watch?v=rsJu_NsRPgQ

https://www.youtube.com/watch?v=gs6vqt3J6XM