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blockchain

  A  blockchain  , or  chain of blocks  [  1  ]  ,  [  2  ]  , is a technology for storing and transmitting information without a control organ.  Technically, it is a  distributed database  whose information sent by users and internal links to the database are checked and grouped at regular time intervals into blocks, thus forming a chain  [  3  ]  .  The whole is secured by  cryptography  .  By extension, a blockchain is a distributed database that maintains a list of records protected against  tampering. or modification by  storage  nodes  ;  it is therefore a  distributed  and secure  register  of all transactions carried out since the start of the distributed system. There is an analogy with the  Internet  network  , because in both cases the technologies employ computer protocols linked to a decentralized infrastructure.  The Internet allows data packets to be transferred from a “secure” server to remote clients (it is up to recipients to verify the integrity of the data transmitt
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