What Is Bitcoin? The Complete Beginner's Guide

What is Bitcoin? Bitcoin is digital money that belongs to no state, no bank and no company. Thousands of computers around the world keep a shared public ledger together and check every payment. There will never be more than 21 million bitcoin. You can own them without anyone's permission, send them to anyone and keep them yourself.

You may have heard that Bitcoin is "just speculation", or that it protects your savings from inflation. Neither helps you much as long as you don't know what you are actually buying. This guide explains it without jargon, with real numbers and calculators you can try yourself.

What is Bitcoin – explained simply

Imagine a ledger that records who owns which amount. At your bank, the bank keeps this ledger, and you have to trust it. With Bitcoin, every participant has a complete copy, and the software only allows entries that follow the rules.

This ledger is called the blockchain. The unit in it is called bitcoin (BTC). And the network that holds it all together consists of freely available software that anyone can run on their own computer. How this ledger stays tamper-proof without anyone in charge is shown in Blockchain explained simply. Terms that are new to you can be looked up in the Bitcoin glossary.

This gives Bitcoin three properties that no other money has in this form:

• Nobody can create new bitcoin at will. The software sets how many new ones are created, visible to everyone.
• Nobody can freeze your balance. Whoever has the key can send. There is no bank that can say "no".
• Anyone can verify everything. Every payment since the first day can be viewed publicly, for example on mempool.space.

What problem Bitcoin solves

The euro and the Swiss franc lose purchasing power over the years, because central banks and commercial banks keep creating new money. At 2% inflation a year, €100 is worth only about €67 after 20 years. So savers lose without having done anything wrong. How this money comes into being is explained in The fiat money system explained simply.

Bitcoin was born in the middle of the financial crisis. On 31 October 2008, a person or group using the name Satoshi Nakamoto published the white paper "Bitcoin: A Peer-to-Peer Electronic Cash System". On 3 January 2009 the network started with the first block.

Into this first block Satoshi wrote a newspaper headline of the day: "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks". It is still in the blockchain today, a hint at what Bitcoin was meant to counter: money whose supply is controlled by a few institutions.

How Bitcoin works

You don't need to understand the technology to use Bitcoin, any more than you need TCP/IP to send emails. A rough picture does help you judge the risks correctly, though.

A payment in four steps

1. You sign. Your wallet app signs the payment with your private key. The signature proves that you are allowed to spend the coins, without revealing the key.
2. The network checks. The payment is sent to many computers (nodes). Each one checks: is the signature valid? Have these coins already been spent?
3. A miner writes the block. About every ten minutes a miner bundles checked payments into a block and attaches it to the chain.
4. The payment is confirmed. With every further block on top, it becomes practically impossible to reverse the payment. For larger amounts people usually wait six blocks, about an hour.

Miners: who writes new blocks

Miners are data centres with specialised computers that compete for the right to write the next block. The winner receives newly created bitcoin (the block reward) and the fees of the payments in the block. Since April 2024 the reward has been 3.125 BTC per block.

The competition costs electricity. That is exactly what makes fraud expensive: anyone who wants to forge the chain would need more computing power than all honest miners combined. How much electricity that is and where it comes from is shown in the fact check on Bitcoin's energy use.

Nodes: who checks the rules

A node is a computer running the Bitcoin software with a complete copy of the blockchain. It only accepts blocks that follow all the rules, including the supply limit. A miner who grants itself a bigger reward is simply ignored by the nodes. You can run your own node on a small computer at home.

Why there are only 21 million bitcoin

At the start, each block brought 50 new bitcoin. Every 210’000 blocks, roughly every four years, this reward is cut in half. This is called the halving; more on it in The Bitcoin halving explained simply. Adding up all rewards gives just under 21 million bitcoin. After that no new ones are created, probably around the year 2140.

As of Nov 12, 2026 (block 975’579), about 20.11 million bitcoin have been mined, just under 96% of all bitcoin that will ever exist. Some of them are lost forever because their owners lost their keys. Nobody knows exactly how many. How the limit is written in the code, who protects it and why Satoshi chose exactly 21 million is explained in Why there are only 21 million bitcoin.

Sats: you don't need a whole bitcoin

One bitcoin can be divided into 100 million smallest units. They are called satoshis, or sats for short, after the inventor. So you can start with €10 or CHF 10.

How long it takes to reach a whole bitcoin and why intermediate goals often make more sense is shown in Becoming a wholecoiner: the road to a whole bitcoin.

Do the maths with your own amount and today's price:

Who owns Bitcoin?

Nobody, and everyone who uses it. There is no company behind Bitcoin, no boss and no headquarters. Satoshi Nakamoto withdrew in 2011, and his identity is still unknown. How Bitcoin came about and who has been named as its inventor is told in Satoshi Nakamoto and the origins of Bitcoin. The software is maintained by volunteer developers around the world, and every change has to be adopted voluntarily by the nodes. That is exactly what sets Bitcoin apart from the thousands of other coins, see Bitcoin vs. altcoins.

How many bitcoin listed companies hold today is shown in our overview of bitcoin treasuries.

Owning bitcoin: a key instead of an account

Bitcoin are not stored on your phone. They are recorded in the blockchain, and your private key gives you the right to move them. A wallet is the program or device that manages this key.

When you set it up, a wallet shows you 12 or 24 words, the seed phrase. All your keys can be restored from it, even if the device breaks. Whoever knows these words owns your bitcoin.

You have two options:

• Leave them on an exchange or app. Convenient, but the exchange holds the key. If it goes bust or locks your account, you can't reach your coins. That happened to thousands of customers at Mt. Gox in 2014 and FTX in 2022.
• Keep them yourself. You hold the key, for example on a hardware wallet. Nobody can take away your access, but you are responsible for the backup.

Many people start with small amounts in an app and move to their own wallet once the amount matters to them. How to do that safely is shown in the guide How to store bitcoin safely.

What is a bitcoin worth?

Bitcoin has no fixed price. Like shares or gold, its price comes from supply and demand on exchanges worldwide, around the clock. On Nov 12, 2026 it was €65’055 (CHF 60’059, $71’911).

The price swings hard. That is not a detail but the most important thing you need to know before your first purchase:

After each of these crashes, the price later rose above the previous high. Nobody can promise that it will happen again. Since its high of $124’673 on Oct 6, 2025, it has fallen by about 42% up to Nov 12, 2026.

The long-term trend: the Power Law

In the short term the price is hardly predictable. Over many years, however, it has so far followed one curve remarkably closely, the Power Law: the price grows with a fixed power of the time since the first block. The curve fits the daily prices since 2010 with an R² of 0.961.

Below it lies the floor at 42 % of this curve. So far the price has fallen below this line only rarely and briefly. The trend, the fair value, is the middle of past prices: it lies above the floor and moves a little closer to it every year. Where the price stands today:

As of Nov 12, 2026, the fair value according to the trend is about €98’423 (CHF 90’864) and the floor €60’705 (CHF 56’043). The price is therefore at about 0.66 times the trend, in the accumulation zone (from the floor up to 0.79 times the trend). In this zone, holding for years has always paid off so far. That is not a guarantee.

The whole curve with all cycles is in the Power Law analysis.

Bitcoin, euro and gold compared

Which properties make good money overall and how the three score on each of them is shown in the comparison What is good money? How Bitcoin and gold compare as stores of value on return, risk and taxes is shown in Bitcoin vs. gold.

Risks you should know

• Price swings. Declines of 70% and more have happened several times. Only invest money you won't need for years.
• Loss through your own mistakes. A lost seed is a lost fortune. Nobody can reset it.
• Scams. Promises of fixed returns, "bitcoin doublers" and fake support staff are the most common tricks. How to recognise them is in How to spot bitcoin scams.
• Exchange collapses. Coins on an exchange are a promise by the exchange, not your bitcoin.
• Rules and taxes. In Germany, gains are tax-free after a holding period of more than one year (§ 23 EStG, as of 2026). In Austria, since March 2022 a 27.5% tax applies to gains on coins bought after February 2021. In Switzerland, private capital gains are usually tax-free, but your holdings count towards wealth tax.

How to get started with Bitcoin

1. Learn the basics. The first stage of our Bitcoin Academy takes you through everything important in twelve short lessons.
2. Set an amount you can live with. Even an 80% decline must not put you in difficulty.
3. Buy regularly instead of all at once. A savings plan smooths out the swings. What your savings plan could add up to over the next years is worked out by the savings plan calculator using the Power Law model.
4. Take your keys. Once the amount matters to you, keep it in your own wallet and back up the seed. The guide Setting up a bitcoin wallet walks you through every step.
5. Stick with it. Bitcoin is a plan over years, not weeks.