A blockchain is like a group of friends who all keep track of a shared notebook to make sure no one cheats when they play games.
Blockchain works by having many people (called nodes) agree on the same list of transactions. Imagine you and your friends are playing a game where you pass around a toy, and each time someone gets it, they write down who has it now in a notebook. Everyone checks the notebook to make sure no one lies about who has the toy.
Each new page in the notebook is like a block, and all these pages together form the chain, that’s why it's called a blockchain!
When you want to add a new transaction, like giving the toy to another friend, everyone checks if what you wrote matches what they saw. If they agree, they add your note to the notebook.
This way, no one can change past notes without everyone noticing, it’s like having a group of friends who all watch each other so no one can cheat!
Examples
- A bakery uses a shared digital notebook to track every sale, and all the staff must agree before any changes are made.
- Each time you send cryptocurrency, your computer and others verify the transaction like a group of people confirming who gave what to whom.
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See also
- How Do Fingerprint Scanners Actually Work?
- How do passwords work the same way?
- What are dictionary attacks?
- What is A strong password is like a secret code that's hard to guess?
- What are passwords?