How Does Bitcoin Mining Work? Explained for Kids

Your 7-year-old just asked you what Bitcoin mining is. You're pretty sure it doesn't involve a pickaxe, but beyond that you're fuzzy. Fair enough. Here's the version I use with my own kids, and it actually works.

Bitcoin mining is how new bitcoin gets created and how transactions get verified. Thousands of specialized computers around the world race to solve a math puzzle roughly every 10 minutes. The winner earns newly minted bitcoin as a reward, currently 3.125 BTC per block after the April 2024 halving.¹

What is Bitcoin mining in simple terms?

Bitcoin mining is when computers solve really hard puzzles. The first computer to solve the puzzle gets rewarded with new bitcoin. That's how new bitcoin gets made and how transactions get checked.

Think of it like a huge math contest. Thousands of computers around the world are all racing to solve the same puzzle at the same time. The winner gets paid. Then a new puzzle starts.

Michael Saylor calls Bitcoin “digital energy” because miners literally convert electricity into a digital asset that can be stored forever and sent at the speed of light.⁷ That clicked for me when I realized mining isn't wasting energy; it's transforming it.

Why is it called “mining”?

Gold miners dig through tons of rock to find a small amount of gold. Bitcoin miners burn through tons of electricity to find the right answer to a puzzle. The work is hard, the reward is scarce, and you can't fake it. That's the connection.

What does Bitcoin mining actually do?

Every 10 minutes (roughly), all the recent Bitcoin transactions get bundled into a “block.” Miners compete to seal that block by solving the puzzle. Once one of them cracks it, the block gets added to the blockchain, and everyone can see those transactions are legit.

The miner who solved it gets bitcoin as a reward. Right now, that reward is 3.125 bitcoin per block.¹ It gets cut in half roughly every 4 years (called the “halving”). The reward started at 50 bitcoin in 2009.² Do the math: the supply gets tighter over time.

How much energy does Bitcoin mining use?

Bitcoin mining consumes an estimated 150+ terawatt-hours of electricity per year.³ That's a real number. But about 54.5% of Bitcoin mining now runs on renewable energy sources like solar, hydro, and wind.⁴ Miners chase the cheapest electricity they can find, and renewables are increasingly the cheapest option. It's an evolving picture, and honest people disagree about the tradeoffs.

Kid questions about Bitcoin mining

• “Do people mine Bitcoin in their house?” Some do, but most mining now happens in big warehouses full of specialized computers. It uses a lot of electricity, so miners look for the cheapest power they can find.
• “Can I mine Bitcoin on my iPad?” Not really. The puzzles are so hard now that regular computers can't compete. You need special machines called ASICs that cost thousands of dollars.⁵
• “What happens when all the bitcoin is mined?” Miners will still earn fees from people who send bitcoin. The last bitcoin won't be mined until around the year 2140.² If that feels far away, it's because it is. You can read more about why there are only 21 million bitcoin.
• “Does mining make Bitcoin more expensive?” Mining doesn't set the price directly. But the halving schedule means fewer new bitcoin get created over time, which affects supply. If you want the full picture on how inflation works, we cover that separately.

Try this at home

The number-guessing mining game (10 minutes, ages 6+). Write a secret number between 1 and 100 on a piece of paper. Fold it up. Your kids take turns guessing. After each guess, you say “higher” or “lower.” The first person to guess the exact number wins a small reward (a coin, a sticker, a piece of candy). Then pick a new number. That's mining: guess, check, try again, get rewarded.

For a deeper hands-on lesson, our elementary Bitcoin lesson plan has a full classroom-ready version of this activity.

Materials: Paper, pencil, small rewards. Time: 10 minutes.

Sources

1. Bitcoin.org, How Bitcoin Works (block reward schedule)
2. Nakamoto, Satoshi. Bitcoin: A Peer-to-Peer Electronic Cash System (2008)
3. Cambridge Centre for Alternative Finance, Cambridge Bitcoin Electricity Consumption Index
4. Daniel Batten, Bitcoin Mining Sustainable Energy Mix (2024)
5. Blockchain.com, Bitcoin Network Hash Rate
6. CoinDesk, “Bitcoin Halving 2024: What You Need to Know”
7. Saylor, Michael. Interview with Anthony Pompliano, discussing Bitcoin as “digital energy”