Home › Guides › Crypto

What is bitcoin? How it works, in plain English

Bitcoin is a kind of digital money that no company or government runs. It only looks mysterious because it's usually explained in tech words. Here's the plain version.

Beginner guide · 7-minute read · Updated 2026-10-21

Bitcoin in one paragraph

Bitcoin is digital money you can send to anyone, anywhere, without a bank.

A shared public record, the blockchain, tracks every coin. Thousands of computers around the world keep copies of it. No single person or company is in charge.

Bitcoin (with a capital B) is the network. bitcoin (small b) or BTC is the coin.

Where it came from

On October 31, 2008, someone using the name Satoshi Nakamoto shared a short paper called "Bitcoin: A Peer-to-Peer Electronic Cash System."

The network went live on January 3, 2009. Nobody knows for sure who Satoshi is. They went quiet around 2011.

The idea was simple: let people pay each other online without trusting a middleman.

How a bitcoin payment works

Let's follow one payment.

1. You open your wallet app and enter the address you're paying. An address is a long string of letters and numbers, like an account number.
2. Your wallet signs the payment with your Private key, the secret code that proves the coins are yours.
3. The payment goes out to the network, where it waits to be included.
4. A miner bundles it into a block. A new block is added about every 10 minutes.
5. More blocks stack on top. Each one makes the payment harder to undo. Many services wait for a few blocks before they treat it as final.

Once confirmed, it can't be reversed. Double-check every address before you send.

What "mining" means

Mining is how new blocks get added, and how new bitcoin is created.

Miners run special computers that race to solve a math puzzle. The winner adds the next block and earns a reward of new bitcoin, plus the fees from the payments in that block.

This system is called Proof of work. It uses a lot of electricity on purpose. That cost is what makes it very expensive to cheat.

The puzzle gets harder or easier about every 2 weeks, so blocks keep coming roughly every 10 minutes.

The 21 million cap and the halving

Here's what makes bitcoin unusual.

• There will only ever be 21 million bitcoin. That limit is written into the code.
• New coins come out on a schedule. The reward miners get is cut in half about every 4 years. That's called the halving.

The next is expected around 2028. Our Bitcoin halving page explains more, and crypto market cycles covers how people link halvings to price, and why that pattern isn't a promise.

You don't have to buy a whole bitcoin

This surprises a lot of people. A bitcoin splits into 100 million tiny pieces. The smallest piece is called a satoshi (0.00000001 BTC).

So you can buy $20 worth if you want. You'd just own a small fraction of one coin.

What sets bitcoin's price?

No company stands behind bitcoin, so it doesn't have earnings like a stock. Its price is simply what buyers and sellers agree on, minute by minute.

Things that tend to move it:

• Demand from big funds, including the spot bitcoin ETFs that started trading in January 2024. See bitcoin ETFs explained.
• Interest rates and the dollar. Bitcoin often reacts to Fed decisions. See how interest rates affect stocks, much of which applies here too.
• Rules and news, like new laws, exchange failures or hacks.
• Leverage. When many traders borrow to bet, forced sell-offs can make moves bigger.

Bitcoin's price has swung a lot over its life. It has fallen by more than 70% from a peak more than once, including in 2018 and 2022.

Ways to own bitcoin

Our guide on self-custody vs keeping crypto on an exchange helps you pick.

The risks, plainly

• Big swings. Large drops have happened many times and can happen again.
• No undo. A payment sent to the wrong address is usually gone.
• Scams. Fake "bitcoin doubling" offers and fake support agents are common.
• Lost keys. If you hold it yourself and lose your recovery words, no one can help.
• Platform risk. Exchanges have failed or been hacked in the past.

Reading a bitcoin chart

The same chart skills work on bitcoin as on any market. Start on the daily chart, mark the last places price turned around, and only count a candle body closing past a level, not a tail poking through. Our bitcoin market page covers how it tends to move, and how to read crypto charts walks you through it.

Questions