Blog_Post: Blockchain
(short)
A blockchain is a continuously growing list of records, called blocks, which are linked and secured using cryptography.
(longer)
It is "an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way". For use as a distributed ledger, a blockchain is typically managed by a peer-to-peer network collectively adhering to a protocol for validating new blocks. Once recorded, the data in any given block cannot be altered retroactively without the alteration of all subsequent blocks, which requires collusion of the network majority.
Source: https://en.wikipedia.org/wiki/Blockchain
i. Basic block structure
Source: https://medium.com/@lhartikk/a-blockchain-in-200-lines-of-code-963cc1cc0e54
ii. Block structure in Bitcoin blockchain
Source: http://computersecuritypgp.blogspot.com/2016/05/what-is-blockchain.html
Simple
Source: https://bitsapphire.com/wp-content/uploads/2017/01/Blockchain-industry-innovation-or-overhyped.png
In Detail:
Source: http://www.relativelyinteresting.com/wp-content/uploads/2016/06/how-a-bitcoin-transaction-works.jpg
