The　tamper-proof　digital　database　on　which　are　written　all　exchanges　between　its　users　since　its　inception　is　named　Blockchain.　The　blockchain　is　a　system　of　storage　distributed　on　a　peer-to-peer　network　(p2p)　using　consensus　mechanism,　asymmetric　encryption,　smart　contracts　and　other　key　technologies.　In　an　untrusted　environment,　blockchain　comes　to　associate　the　implementation　of　a　mechanism　for　the　exchange　of　information,　transfer　of　value　intended　to　ensure　consistency,　and　integrity　data　is　the　cornerstone　of　the　creation　of　value　future　of　the　Internet.　Blockchain　technology　has　the　following　features:　decentralized,　safe,　reliable,　open　and　transparent.　Its　characteristics　make　the　most　attractive　blockchain　and　is　the　subject　of　all　the　debates　at　the　safe　level.　File　storage,　healthcare,　banking,　insurance,　field　and　other　scenarios　are　widely　used.　However,　the　technology　of　the　blockchain　is　still　some　problems,　such　as　the　low　flow　of　transactions,　easy　disclosure　of　user　information,　the　confidentiality　of　the　data　of　transactions　and　the　safe　limits　of　algorithms　encryption.　His　problems　that　must　be　resolved　urgently　in　its　development　and　its　application.　As　an　emerging　technology,　the　blockchain　still　has　plenty　other　still　undiscovered　problems,　but　it　has　broad　prospects　of　development　and　should　allow　the　creation　of　a　new　decentralized　era　and　a　new　world　of　Central　governance　without　organ　of　management.