How does a blockchain work — Simply Explained

Summary

Simply Explained walks through the mechanics of a blockchain: how data is hashed into blocks, how blocks are chained together, and why changing one block would require recalculating every block after it. A classic intro video with over 10 million views.

Key Concepts

Things To Remember

• Each block contains a hash of the previous block, creating the chain.
• Changing any block invalidates all blocks that follow it.
• The blockchain is distributed — thousands of copies exist simultaneously.
• No single party can alter the record without controlling the majority of the network.

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