steemitboard (66)in #bitcoin • 5 years agoRE: Free online O'Reilly edition "Mastering Bitcoin" by Andreas M. AntonopoulosCongratulations @spyder1! You received a personal award! Birthday! - You are on the Steem blockchain for 2…steemitboard (66)in #bitcoin • 6 years agoRE: Free online O'Reilly edition "Mastering Bitcoin" by Andreas M. AntonopoulosCongratulations @spyder1! You have received a personal award! 1 Year on Steemit Click on the badge to view…