The first decentralized cryptocurrency, running on a proof-of-work blockchain since January 2009. The reference asset for the entire crypto market.
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Bitcoin is the first and most established cryptocurrency, designed to be a peer-to-peer electronic cash system that operates without a central authority. It was introduced in October 2008 by an anonymous person or group writing under the name Satoshi Nakamoto, who published a whitepaper proposing a system where transactions are verified by a distributed network of nodes using cryptographic proof. The Bitcoin network went live on January 3, 2009 with the mining of the genesis block, which contained the now-famous text "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks".
Today, Bitcoin functions primarily as a store of value, often called "digital gold" because of its fixed 21 million supply, decentralized nature, and resistance to inflation through monetary policy. While it can be used for payments, the network's intentionally limited throughput (around 7 transactions per second) means most economic activity happens on Layer 2 networks like the Lightning Network or wrapped representations on smart-contract platforms.
Bitcoin uses a proof-of-work consensus mechanism: miners compete to solve a computationally expensive cryptographic puzzle (SHA-256 double hashing) for the right to add the next block of transactions. The miner who finds a valid solution first broadcasts the block, the rest of the network verifies it, and the miner receives the block reward (currently 3.125 BTC per block, which halves every 210,000 blocks per the halving schedule).
New blocks are added approximately every 10 minutes, and the protocol automatically adjusts mining difficulty every 2,016 blocks to maintain that target. Once a block is buried under several confirmations (typically 6 for high-value transactions), reversing it would require an attacker to control more than 50% of the network's total hashrate, which is currently impractical given the network's ~700+ exahash/s of compute. Wallets track ownership using UTXOs (Unspent Transaction Outputs) rather than account balances.
The dominant use case in 2026 is store of value: holding BTC as a long-duration savings asset, often as a hedge against fiat currency debasement and as portfolio diversification. Spot Bitcoin ETFs launched in 2024 made institutional allocation straightforward, and they now hold significant fraction of circulating supply. Secondary use cases: international remittances (especially via Lightning), settlement-layer collateral for DeFi (via wrapped BTC on Ethereum and L2s), and a small but growing merchant payments segment particularly outside the US.
Critics point to Bitcoin's energy consumption (network electricity use rivals small countries), its limited base-layer throughput, the persistent volatility that makes day-to-day pricing impractical, and the lack of native programmability. Supporters argue these are deliberate tradeoffs: high energy use is what makes the network attack-resistant, simplicity is what makes the rules predictable for decades, and price volatility is the natural state of an asset that is still being adopted globally.
Read more in the Bitcoin Mempool article, the 2026 Bitcoin sentiment analysis, or check live data at /api/btc-price.