How does a blockchain work - Simply Explained?

A blockchain is like a shared notebook that everyone can write in, and no one can change what’s already written.

Imagine you and your friends are playing a game where you take turns adding a new page to a notebook. Each time someone adds a page, they have to copy down everything that was there before, and then add their own note. This way, if someone tries to cheat by changing an old page, everyone else will notice because the copy doesn’t match.

Blockchain works in a similar way. It’s like this notebook, but instead of pages, it has blocks, each block holds information about a transaction or event. When something new happens, like sending some coins to a friend, a new block is added to the chain.

To make sure everyone agrees on what's written in the notebook, your friends have to solve a little puzzle before they can add their page. This puzzle is called mining, and it’s like figuring out a secret code so only the right person gets to write next. Once someone solves the puzzle, they share their answer with everyone else, and then the game continues!

This makes sure no one can change past pages without everyone noticing, just like in your game! A blockchain is like a shared notebook that everyone can write in, and no one can change what’s already written.

Imagine you and your friends are playing a game where you take turns adding a new page to a notebook. Each time someone adds a page, they have to copy down everything that was there before, and then add their own note. This way, if someone tries to cheat by changing an old page, everyone else will notice because the copy doesn’t match.

Blockchain works in a similar way. It’s like this notebook, but instead of pages, it has blocks, each block holds information about a transaction or event. When something new happens, like sending some coins to a friend, a new block is added to the chain.