Brief Overview on Blockchain Technology

Posted By : Akshay Singh | 26-Sep-2019

Blockchain was first perceived by Satoshi Nakamoto as a peer-to-peer money exchange system in 2008. Nakamoto referred the exchange tokens for transaction among clients in his system as Bitcoins. As suggested by the name, blockchain is a chain of blocks that contain information such that the data inside the block cannot be tampered with. A ‘block’ is defined as a file of recorded information that cannot be tampered with.



Some of the characteristic features of blockchain technology are as follows -

  • Immutable – (permanent and tamper-proof) a blockchain contains permanent record of transactions. Once a block is added to the blockchain, it can’t be altered. This creates trust in the transaction record.
  • Decentralized – (networked copies) a blockchain is stored in a file that can be accessed and copied by any node on the network. This creates decentralization.
  • Consensus Driven – (trust verification) every block on the blockchain is verified using various “Consensus Models” which contain rules for confirming a block, and rarely use a scarce resource (such as computing power) to prove that adequate effort was created. In Bitcoin, this process is called as “Mining Process”.  A central authority or an explicit trust-granting agent is not required in this mechanism.
  • Transparent – since the blockchain is open file, any party can freely access it and audit transactions. This creates proof for tracking some lifetime assets.


Blockchains can be classified as a public or private depending on its application -

Public – Public blockchains have

  1. no single owner
  2. visible by anyone
  3. their consensus process is open to all to participate in
  4. fully decentralized
           Bitcoin is an example of a public blockchain.

Private/ Permissioned – Private blockchains use privileges to control who can read from and write to the blockchain. Consensus algorithms and mining usually aren’t required here because a single entity has ownership and controls block creation.



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