Thanks for info, after this post I am doing it for all my articles and posts. Steemit does not allow to edit posts after 1 week. So I am unable to add reference here in this post and also when I wrote this post and published, I didn't know how to edit a post after publishing as I was new to steemit and still learning to use the interface. But for reference and completeness, I am adding it here . I referred following sources : https://en.wikipedia.org/wiki/Blockchain
https://en.wikipedia.org/wiki/Cryptography
https://en.wikipedia.org/wiki/Secure_by_design
https://en.wikipedia.org/wiki/Distributed_ledger
https://en.wikipedia.org/wiki/Peer-to-peer
https://en.wikipedia.org/wiki/Distributed_computing

Hope you find this post helpful. Looking forward to see you again.