Blockchain is the world's leading software platform for digital assets. A blockchain is a distributed database that is used to maintain a continuously growing list of records, called blocks. Each block contains a timestamp and a link to a previous block. A blockchain is typically managed by a peer-to-peer network collectively adhering to a protocol for validating new blocks.
Security Starts with Network Architecture and Another security concern in the establishment of network architecture is how to treat uncommunicative or intermittently active nodes. Nodes may go offline for innocuous reasons, but the network must be structured to function (to obtain consensus on previously verified transactions and to correctly verify new transactions) without the offline nodes, and it must be able to quickly bring these nodes back up to speed if they return.
This is my reference link:
https://hbr.org/2017/03/how-safe-are-blockchains-it-depends
See also this Forbes article
https://www.forbes.com/sites/jasonbloomberg/2017/05/31/eight-reasons-to-be-skeptical-about-blockchain/
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