For now, just know that private keys are what you must protect if you want to maintain your bitcoin safe from hackers, person error, and various probable challenges. https://www.reddit.com/r/technology/comments/v2ekzv/comment/iav9c4e/?utm_source=share&utm_medium=web2x&context=3 2FA is conceptually similar to a safety token machine that banking companies in some countries involve for o... http://bitcoin-atm65321.newsbloger.com/15712181/an-unbiased-view-of-bitcoin-tumbling