What Is Bitcoin?

Bitcoin is a decentralized digital currency that lets you send and receive money anywhere in the world without a bank, government, or any third party in the middle. It runs on a peer-to-peer network where transactions are verified by thousands of computers worldwide and permanently recorded on a public ledger called the blockchain.

Created in 2009 by the pseudonymous Satoshi Nakamoto, Bitcoin was the first successful implementation of a trustless digital payment system. Its fixed supply of 21 million coins makes it fundamentally different from every traditional currency ever created.

Why Was Bitcoin Created?

Bitcoin was created in response to the 2008 financial crisis. Satoshi Nakamoto published the Bitcoin whitepaper on October 31, 2008, titled "Bitcoin: A Peer-to-Peer Electronic Cash System." The goal was to create money that didn't rely on trust in banks or governments.

Traditional currencies have a central problem: they require you to trust that a bank will honor your balance, that a government won't inflate the supply, and that financial institutions will process your transactions fairly. Bitcoin removes that trust requirement by replacing it with mathematics and cryptography.

How Does Bitcoin Work?

Bitcoin works through a combination of three core technologies working together:

The blockchain - A public ledger that records every Bitcoin transaction ever made, copied across thousands of computers worldwide
Public-key cryptography - Mathematical keys that prove ownership of Bitcoin without revealing your identity
Proof of work - A consensus mechanism where miners compete to add new transactions to the blockchain, securing the network

When you send Bitcoin, you broadcast a signed transaction to the network. Miners collect transactions, verify them, bundle them into a block, and add that block to the chain. Once confirmed, the transaction is permanent and irreversible.

What Makes Bitcoin Different from Other Currencies?

Bitcoin has several properties that distinguish it from both traditional money and other digital currencies:

Fixed supply - Only 21 million Bitcoin will ever exist. This is enforced by code and cannot be changed.
Decentralized - No single entity controls Bitcoin. It's maintained by a global network of nodes and miners.
Permissionless - Anyone can send or receive Bitcoin without asking permission from anyone.
Censorship-resistant - No government or institution can freeze or seize Bitcoin held in a personal wallet.
Transparent - Every transaction is publicly visible on the blockchain, though wallet addresses aren't linked to real identities by default.

What Is a Satoshi?

A satoshi (or "sat") is the smallest unit of Bitcoin, named after its creator. One Bitcoin equals 100,000,000 satoshis. This divisibility means you don't need to buy a whole Bitcoin - you can own any fraction, from a few dollars worth of sats all the way up.

How Do I Get Bitcoin?

There are three main ways to acquire Bitcoin:

Buy it on an exchange - Platforms like Coinbase, Strike, or Swan Bitcoin let you purchase Bitcoin with your local currency
Earn it - Some businesses pay employees or contractors in Bitcoin
Mine it - Run mining hardware that competes to add new blocks to the blockchain (not practical for most individuals)

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Frequently Asked Questions

What is Bitcoin in simple terms?

Bitcoin is digital money that you can send directly to anyone in the world without a bank. It runs on a decentralized network, meaning no single company or government controls it. Transactions are recorded on a public ledger called the blockchain.

Who created Bitcoin?

Bitcoin was created by a person or group using the pseudonym Satoshi Nakamoto. The Bitcoin whitepaper was published in October 2008 and the first Bitcoin block was mined in January 2009. Satoshi's identity has never been confirmed.

Is Bitcoin real money?

Bitcoin functions as money in several ways: it can be used as a medium of exchange, it stores value over time, and it is divisible into smaller units called satoshis. Whether it qualifies as legal tender depends on the country - El Salvador made Bitcoin legal tender in 2021.

How many Bitcoins exist?

There will only ever be 21 million Bitcoin. This fixed supply is written into Bitcoin's code and cannot be changed. As of 2024, approximately 19.7 million Bitcoin have already been mined. The last Bitcoin is expected to be mined around the year 2140.

Is Bitcoin safe to use?

Bitcoin's network itself has never been hacked. The security risk for most people is in how they store their Bitcoin - using exchanges means trusting a third party. Holding Bitcoin in a personal wallet with your own private keys is the most secure approach, often called self-custody.