What is Blockchain? And a Short History



When most people hear “blockchain,” they immediately think Bitcoin. But blockchain is much bigger than just cryptocurrency.

So, what exactly is it?

Blockchain is like a public notebook that everyone can see, but no one can erase or change.
It stores information in blocks, which are linked together in a chain. Each block contains transactions, a timestamp, and a security code (called a hash).

This makes blockchain secure, transparent, and trustworthy — the foundation of Web3.

A Quick Look at History

1991 – 1992
Two researchers, Scott Stornetta and Stuart Haber, worked on digital timestamping using cryptography. This was the early spark.

2008
Satoshi Nakamoto published the famous Bitcoin Whitepaper. This was the first real use of blockchain in action.

2015
Ethereum was born. It took blockchain beyond just digital money by introducing smart contracts and decentralized apps (dApps).

2018 – Today
The rise of Web3: DeFi, NFTs, DAOs, Gaming, SocialFi, and more. Blockchain is now powering multiple industries across the world.

Key Point

Blockchain is not just about coins or tokens. It’s about creating a system that is decentralized, transparent, and trustless.

It started with Bitcoin, grew with Ethereum, and today it’s shaping the future of finance, identity, and the internet itself.

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