From Zero to Genius: How I Built a Blockchain from Scratch in Python

A Beginner’s Guide to Understanding and Building Your Own Blockchain Step-by-Step

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“Blockchain. It’s one of those words that sounds complicated like quantum physics or tax law. But guess what? It’s actually much simpler (and much cooler) than you think.”

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What is Blockchain, Really?

You’ve probably heard the word “blockchain” thrown around, sometimes linked to Bitcoin, sometimes Ethereum, sometimes NFTs or smart contracts. It can get confusing fast.

At its core, blockchain is just a clever way to store and share data across a network of computers without needing a central server. Think of it like a shared notebook where everyone writes, everyone reads, and everyone keeps an eye out to make sure no one cheats.

Most blockchains,

• Store records (often financial transactions)
• Share the data almost instantly across many computers
• Use cryptography to ensure everything is secure and authentic