How Does a ‘Blockchain’ Work and Why Is It Secure?

Think of a blockchain like a shared notebook that everyone has a copy of. When someone writes something in it, like ‘Alice sent Bob 10 coins’, all the copies update at once, no one can change it later without everyone noticing. That’s why it’s secure.

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Examples

A shared notebook where no one can change what was written before.
Everyone in the class has a copy of the same homework sheet, if someone changes their copy, everyone knows.
You send money to your friend, and both you and your friend’s phone update at the same time.

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Categories: Technology · Blockchain,Cryptography,Security