What is Bitcoin, in one sentence?

Bitcoin is digital money with a fixed supply of 21 million coins that runs on a network of computers around the world, with no company, government, or central bank in charge of it.

A person or group using the name Satoshi Nakamoto published the original paper in 2008, ran the network for about two years, and then disappeared in 2010. Their identity has never been confirmed. The roughly one million bitcoin they mined in the early days have never moved.

Is Bitcoin the same as 'crypto'?

No. Crypto is a category that includes thousands of coins, most of which have a company behind them, a CEO, a foundation, and the ability to change the supply or the rules. Bitcoin has none of that. The supply is fixed, the rules are set in code that has not changed since 2009, and nobody is in charge.

How is new Bitcoin created?

Through mining. Computers around the world compete to solve a math puzzle every ten minutes. The winner gets a small amount of new Bitcoin. The reward cuts in half every four years (this is called the halving), and the total supply tops out at 21 million coins around the year 2140.

The Bitcoin network itself has never been hacked since it started in 2009. What does get hacked is the companies that hold Bitcoin for people — exchanges, lending platforms. Holding your own Bitcoin in a self-custody wallet removes that risk and shifts the responsibility to you: lose your keys and the Bitcoin is gone.

Why does the price move so much?

Bitcoin is still a small asset by global standards, and there is no central bank smoothing the price. Drops of 50% or more are normal in down years. Saving Bitcoin only works if you can hold through those years without panicking.

What Is Bitcoin?

Bitcoin is money that runs on the internet instead of through a company. It has been operating since January 3, 2009 — older than almost everyone reading this page — and the rules have not changed since the day it started. The supply is capped at 21 million coins, ever. No president, no central bank, and no committee can vote to make more. That is the pitch, and it has held for fifteen years.

If you have read what inflation is, you have already seen the problem Bitcoin was built to solve. Regular money is designed to lose a little value every year, forever, and you have no say in it. Bitcoin is the first money in human history where the supply schedule is public, fixed in code, and unable to be changed by anyone — including the people who built it.

The 21 million

The total supply of Bitcoin is capped at 21 million coins. It is a hard limit, written into the software that every Bitcoin computer on earth runs. The day the 21 millionth coin is created — sometime around the year 2140 — no more will ever exist.

New Bitcoin is created through a process called mining. Computers around the world compete to solve a math puzzle every ten minutes. The winner of each round gets a small amount of new Bitcoin as a reward. Every four years, that reward cuts in half. This is called the halving, and it happens automatically, on a schedule, without any human voting on it.

The dollar, the euro, the peso — all of them have supply schedules that come out to "whatever the central bank decides this year." Bitcoin has a schedule nobody has touched since 2009, and the next time it changes will be never.

Twenty-one million, divided by everyone

Twenty-one million sounds like a lot until you do the division.

There are about 8 billion people on Earth right now. If every single one of them got an equal share of all Bitcoin that will ever exist, each person would get about 0.00263 BTC — roughly 262,500 sats. That is the per-capita limit, forever, no matter how many people eventually want some.

There is no version of Bitcoin where everyone owns a million sats. There is no version where most people own even a quarter of a million. Owning a million sats today already puts you above the global per-person share. Owning ten million sats puts you in unusually concentrated territory.

The math does not get more generous as more people learn about Bitcoin. The supply is fixed. The population is not.

Who controls Bitcoin

Nobody owns Bitcoin. There is no Bitcoin CEO, no Bitcoin headquarters, no government with the keys. The rules are enforced by tens of thousands of computers around the world, all running the same software, all checking each other's work. If any one of them tries to cheat, the others reject the cheating, and the rules hold.

This sounds abstract until you compare it to the alternative. The dollar is controlled by the Federal Reserve — a specific building in Washington, DC, where twelve people meet a few times a year to vote on how much money should exist. The peso is controlled by the Banco Central in Buenos Aires. Every government-issued currency on earth has a phone number you could theoretically call to ask why the money is going to be worth less next year.

Bitcoin does not have a phone number. The rules are the rules, and they are the same for everyone, including the people who built it.

Who made Bitcoin

This is the strangest part of the story, and the part that matters most for trust.

In October 2008, a person or group using the name Satoshi Nakamoto published a nine-page paper online describing the Bitcoin protocol. In January 2009, the same person released the software and mined the very first block. Embedded into that block, where future generations would always be able to see it, Satoshi wrote a single line of text: "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks." That was the front-page headline in London that morning. Bitcoin was built as a response to it.

For the next two years, Satoshi was active in the early community — answering questions, writing code, fixing bugs. Then in late 2010, they sent a final round of messages, handed the project off to other developers, and disappeared. They have not been heard from since. The roughly one million bitcoin they mined in the early days are still sitting in the original addresses, untouched, more than fifteen years later. Probably worth more than most countries' annual budgets at this point. Still untouched.

This matters in a way that is easy to miss. Most projects that claim to be decentralized still have a founder who can be pressured, threatened, paid off, or subpoenaed. Bitcoin's founder erased themself from the picture before the project became famous, and gave up access to a fortune to do it. The network was handed over to nobody in particular, which turns out to be the only kind of owner that cannot be leaned on.

Why Bitcoin and not "crypto"

You have probably seen the word "crypto" used to describe all kinds of things — Bitcoin, Ethereum, Solana, plus thousands of coins most people have never heard of. They are not the same thing, and pretending they are makes it impossible to think clearly about any of them.

Most of those other projects have a foundation, a CEO, a venture capital firm that holds a big chunk of the supply, and a roadmap that can be changed by a vote. The token's value is whatever the company can convince people it is worth, and the supply is whatever the company decides to issue. The rules can be rewritten any time enough of the right people agree to rewrite them, which has happened more than once. These are companies dressed up as currencies.

Bitcoin is different in the way that matters most: nobody can change the rules. The supply schedule is fixed. The founder is gone. The network is run by anyone who plugs in a computer and follows the protocol. If a small group tried to change the rules tomorrow, the rest of the network would simply ignore them and keep running the old rules — which is exactly what has happened the few times someone tried.

The reason Bitcoin gets called "digital gold" and the others get called "crypto" is not marketing. It is the difference between money nobody controls and money some specific company controls.

What Bitcoin is not

Four honest disclaimers before you put any money in:

Not anonymous. Every transaction is recorded on a public ledger that anyone can read. Bitcoin is pseudonymous — your wallet is a string of characters, not your name — but the moment someone connects your real identity to a wallet, they can see the history. Treat Bitcoin like a glass bank account.
Not stable. Bitcoin's price drops 50% or more on a regular cycle. If you cannot stomach watching your savings cut in half before they come back, this is not for you yet.
Not a stock. It does not pay dividends, represent ownership of a company, or have any underlying business. It is money. Its value is whatever other people are willing to trade for it.
Not a get-rich-quick scheme. People who got rich on Bitcoin bought it years ago and held through the ugly periods. The short-term traders have a much worse track record, including the ones who looked like geniuses for a while.

How you actually hold it

Bitcoin is controlled by a private key — a long string of characters generated by your wallet. Whoever holds the key controls the Bitcoin. If you hold the key yourself, you own the Bitcoin. If somebody else holds it for you, they own it, and you own a promise that they will give it back when you ask.

Self-custody is the version where you hold the key. It is the only version that uses Bitcoin the way Bitcoin was built to be used. Piggy is a self-custody wallet — your keys are derived on your phone from a passkey, and we cannot touch your sats. Stacking sats is the practical part: saving small amounts of Bitcoin on a schedule and leaving them alone.