Bitcoin is the first digital money that works without banks, without borders and without anyone in charge. Since 2009 it has survived crashes, bans and thousands of imitators, and it is still the largest cryptocurrency in the world. Understanding what it actually is — and what it is not — is the first step before buying, investing or dismissing it.
What is Bitcoin
Bitcoin is a digital currency that exists only on a public network called the blockchain. There is no company behind it, no server you can shut down and no CEO to call. The rules are enforced by software that runs on thousands of computers around the world, owned by ordinary people.
Anyone can join the network, send or receive bitcoins and verify that transactions are real. No bank account is needed, and no one can freeze your money or block your address. That is the whole point: money that you control directly, without intermediaries.
How the blockchain works
The blockchain is a public ledger: a list of blocks, each containing transactions, linked to the previous one with cryptography. Every computer on the network keeps a copy, so there is no single point of failure.
When you send bitcoin, the transaction is broadcast to the network. Miners group pending transactions into a block and compete to add it to the chain. Whoever solves the cryptographic puzzle first gets newly created bitcoins as a reward. This system is called proof of work, and it is what makes the network secure: rewriting history would require more computing power than the rest of the network combined.
Who created Bitcoin
Bitcoin was launched in 2009 by a person or group using the pseudonym Satoshi Nakamoto. The identity has never been confirmed. Satoshi published the whitepaper in 2008, released the first software and disappeared around 2011, leaving the network running without a leader. That absence is by design: no founder, no company, no single point of control.
How new bitcoins are created
New bitcoins are created as a reward for miners, but the supply is capped at 21 million. Roughly every four years the reward is cut in half in an event called the halving. Around 19.9 million bitcoins already exist, and the last one is expected to be mined around the year 2140.
This fixed supply is what makes Bitcoin scarce. No government can print more of it, and no developer can change the cap without the agreement of the entire network.
Why Bitcoin has value
Bitcoin’s value comes from the same thing that gives value to gold: scarcity, durability and trust. There will only ever be 21 million bitcoins, they cannot be counterfeited, and the network has never been hacked in its history. On top of that, it is global, divisible and transferable in minutes.
That does not mean it is a safe investment. Bitcoin is extremely volatile: it can rise a lot, but it has also fallen more than 50% in a matter of months. Only invest money you can afford to lose.
Common myths
- Bitcoin is anonymous: no. It is pseudonymous. Addresses are not linked to your name, but every transaction is public forever.
- Bitcoin is a bubble that will burst: it has been declared dead hundreds of times and keeps operating. That does not make it a good investment, just a resilient network.
- Bitcoin is bad for the environment: the network uses a lot of electricity, but most miners use renewable energy, and the debate is more nuanced than the headlines.
- Bitcoin is the same as blockchain: no. Bitcoin is a cryptocurrency that uses a blockchain. The technology is used by many other projects for very different purposes.
FAQ
Is Bitcoin legal?
In most countries yes, as an asset or means of payment. Regulation varies: some countries accept it as legal tender, others only allow it as an investment. In Spain it is recognized as an asset and must be declared.
How many bitcoins are there?
Around 19.9 million, out of an absolute maximum of 21 million. The last bitcoin will be mined around the year 2140.
Can I mine Bitcoin from home?
Not profitably today. Competition is global and requires specialized hardware (ASICs). Mining with a regular computer consumes more electricity than it recovers.
Where can I keep my bitcoins?
In a wallet: a software or hardware tool that stores your private keys. Read our guide to crypto wallets to choose the right one.
Can Bitcoin be copied?
The code can be copied, but the network cannot: its value comes from the largest and most secure network in the industry, which no clone has.
Want to keep learning? Read what Ethereum is and how it differs from Bitcoin, or how to buy your first bitcoins step by step.
Further reading
Disclaimer: this content is for educational purposes only and does not constitute financial advice. Cryptocurrencies are volatile assets; only invest money you can afford to lose.
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