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https://www.intheblack.com/articles/2017/11/09/blockchain-how-does-it-work?fbclid=IwAR06Gr894VVBr0QR4lvKLDfgg4V_4FiGw13Vm8TJ90nRSQ8qd3y2eeweXgY#.XH87wjI5Z-0.facebook