What is Bitcoin? A Complete Guide to BTC

October 15, 2026  ·  7 min read

Bitcoin is the world's first decentralized digital currency. Created in 2008 by an anonymous person (or group) using the name Satoshi Nakamoto, it introduced a system for sending money over the internet without any bank, government, or middleman. Seventeen years later, Bitcoin remains the largest cryptocurrency by market capitalization and the most widely held digital asset in the world.

Why Was Bitcoin Created?

Satoshi published the Bitcoin: A Peer-to-Peer Electronic Cash System whitepaper in October 2008, shortly after the global financial crisis. The core problem it solved: how do you send digital money directly to another person without a trusted third party (a bank) to prevent double-spending?

The answer was a public ledger — the blockchain — that everyone can verify but no single entity controls. The Bitcoin network went live in January 2009 when Satoshi mined the genesis block, embedding a headline from The Times: "Chancellor on brink of second bailout for banks" — a pointed commentary on the traditional financial system Bitcoin was designed to bypass.

How the Bitcoin Blockchain Works

Every Bitcoin transaction is broadcast to a global network of thousands of nodes (computers running Bitcoin software). Miners compete to bundle pending transactions into blocks by solving a computationally intensive puzzle — this is called Proof of Work. The first miner to solve it adds the next block to the chain and earns newly created Bitcoin as a reward.

Each block references the previous one, forming an unbroken chain back to the genesis block. Altering any historical transaction would require redoing the work for every block since — an attack that would require more computing power than the entire rest of the network combined.

Bitcoin's Key Properties

• Fixed supply — 21 million BTC: No more than 21 million Bitcoin will ever exist. This hard cap is encoded in the protocol and enforced by every node. As of 2026, over 19.7 million have been mined.
• Halving every 210,000 blocks: The block reward cuts in half approximately every four years. The most recent halving (April 2024) reduced the reward from 6.25 to 3.125 BTC per block. The next halving is expected around 2028. This controlled issuance makes Bitcoin deflationary over time.
• Pseudonymous: Transactions are linked to wallet addresses, not identities. Anyone can create a wallet without providing personal information — though all transactions are permanently visible on the public blockchain.
• Permissionless: Anyone with internet access can send or receive Bitcoin. No approval, no account, no bank required.
• Censorship-resistant: No government or corporation can freeze a Bitcoin wallet or block a transaction from being confirmed (though miners can delay them, they cannot reverse confirmed transactions).

Who Accepts Bitcoin?

Bitcoin is accepted by thousands of merchants worldwide. Major companies including Microsoft, AT&T, and Overstock accept BTC for payments. El Salvador made Bitcoin legal tender in 2021. In 2024, spot Bitcoin ETFs were approved in the United States, bringing institutional investment from BlackRock, Fidelity, and others. Many people hold BTC as a store of value rather than spending it — a "digital gold" use case.

How to Store Bitcoin

Bitcoin is stored in wallets — software that holds your private keys:

• Hot wallets (connected to the internet): Easy to use, suitable for small amounts. Examples: Exodus, Trust Wallet, BlueWallet.
• Cold wallets (offline hardware devices): Maximum security for larger holdings. Examples: Ledger, Trezor. Buy only directly from the manufacturer.

Not your keys, not your coins. Leaving Bitcoin on an exchange means trusting that exchange with your funds. For self-custody, always back up your seed phrase and store it securely offline.

How to Exchange Bitcoin

The easiest way to exchange BTC to another cryptocurrency — or exchange any coin to BTC — is through an instant exchange like FixedFloat. No account needed, no KYC, 400+ trading pairs. Choose fixed rate (1%) for price certainty or float rate (0.5%) for a lower fee. Popular pairs include BTC to ETH, BTC to XMR (Monero), and BTC to LTC.