Bitcoin (BTC): The Complete Guide 2026
Bitcoin (BTC) is the world's first cryptocurrency, created in 2009 by a person or group using the pseudonym Satoshi Nakamoto. In less than 15 years, it evolved from a cryptographic experiment into a recognized financial asset held by institutional funds, sovereign states, and millions of individuals worldwide.
With a supply mathematically capped at 21 million units, Bitcoin is often called "digital gold", a deflationary store of value that no central bank or government can control. Its network has run for over 15 years with no significant downtime, making it the most secure decentralized system ever built.
History of Bitcoin
In October 2008, Satoshi Nakamoto published the famous whitepaper "Bitcoin: A Peer-to-Peer Electronic Cash System". On January 3, 2009, the genesis block was mined. In 2010, a developer bought two pizzas for 10,000 BTC, the first known real-world transaction (now celebrated as "Bitcoin Pizza Day" on May 22nd).
Bitcoin first crossed $1,000 in 2013, hit $20,000 in 2017, and surpassed $60,000 in 2021. A major institutional milestone came in January 2024 when the SEC approved the first Bitcoin spot ETFs from BlackRock and Fidelity, opening floodgates to billions in institutional capital.
How Does Bitcoin Work?
Bitcoin runs on a blockchain, an immutable, distributed ledger maintained by thousands of nodes around the world. The consensus mechanism is Proof of Work (PoW): miners compete to solve complex mathematical puzzles (SHA-256), and the winner adds the next block and earns a BTC reward.
Every four years, this reward is cut in half in an event called the halving, a deflationary mechanism built into the protocol. The most recent halving occurred in April 2024 (reward: 3.125 BTC/block). For fast, low-value payments, the Lightning Network layer-2 solution enables near-instant, near-free transactions.
Bitcoin Use Cases
- Store of value: protection against inflation and currency debasement, the dominant use case.
- International payments: send funds anywhere in the world in minutes, with no bank intermediary and at a fraction of SWIFT fees.
- Daily spending via crypto card: Nexo, Crypto.com, and Coinbase cards let you spend BTC anywhere Visa/Mastercard is accepted, with real-time EUR conversion.
- DeFi collateral: via Wrapped BTC (wBTC or cbBTC), Bitcoin can be used as collateral in DeFi protocols on Ethereum.
- Legal tender: Bitcoin is official currency in El Salvador and the Central African Republic.
Pros and Risks
Advantages:
- Supply capped at 21 million, absolute scarcity guaranteed by code
- The most decentralized and secure network in all of crypto
- Maximum global liquidity, tradeable 24/7 on hundreds of exchanges
- Growing institutional adoption (ETFs, corporate treasuries, sovereign wealth)
Risks:
- High volatility, drawdowns of -50% to -80% have occurred multiple times
- High energy consumption from Proof of Work
- Limited throughput on the base chain (~7 tx/s)
- Irreversible loss if private key or seed phrase is lost
Spending Bitcoin with a Crypto Card
Bitcoin-compatible crypto cards are the ideal tool for using BTC in daily life without manually selling. The card automatically converts your BTC to euros (or local currency) in real time at any merchant accepting Visa or Mastercard.
Some cards even offer BTC cashback on every purchase, a way to stack sats while shopping. Popular cards with Bitcoin support: Nexo Card, Crypto.com Visa, Coinbase Card. Check our card comparison to find the best option for your profile.