Digital Coins Explained

Have you ever watched a grown-up tap a phone or a card to pay for something at the store, instead of handing over paper bills and coins? Some money today isn't made of paper or metal at all - it's just numbers stored safely inside computers all over the world. We call this kind of money digital coins, and it works a little differently from the coins in your piggy bank.

By the end of this lesson, you will be able to: - Explain what makes a coin 'digital' instead of metal or paper - Describe how many computers work together to keep digital money safe - Explain why a secret password (called a 'key') protects your digital coins - Name one real digital coin used in the world today

A penny you can hold in your hand. You can drop it, lose it under the couch, or put it in a jar. A digital coin is different - it isn't a shiny metal circle at all. It's a number that computers agree belongs to you. When you send a digital coin to a friend, no coin actually moves through the mail. Instead, computers around the world update their records to say the number now belongs to your friend instead of you.

Imagine a magic notebook that thousands of copies exist of, all around the world, and every copy always says the exact same thing. Every time someone sends a digital coin, that trade gets written down as a new line in the notebook - and every single copy updates at the same time. This shared notebook is called a blockchain, because the pages (called 'blocks') are locked together in order, like a chain. Because there are so many copies in so many places, it's extremely hard for anyone to sneak in and change what the notebook says.

Think about the key to your house. If you lose it, a stranger could walk right in. Digital coins work the same way, except your 'key' is a very long, very secret code - like a password so complicated that no one could ever guess it. As long as you keep your key secret, your digital coins stay yours. If you ever lose the key, though, there's no locksmith who can make you a new one - the coins are locked away forever.

In the year 2009, a person (or maybe a team of people) using the name Satoshi Nakamoto created the very first digital coin, called Bitcoin. Nobody has ever found out Satoshi's real identity! Since then, thousands of computers around the world have kept Bitcoin's shared notebook running every single day, all day, without ever stopping.