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Bitcoin is a decentralized digital currency first described in a 2008 whitepaper by an unknown person or group using the pseudonym Satoshi Nakamoto. It launched in January 2009 as a peer-to-peer system where transactions occur directly between users without intermediaries. Nakamoto envisioned online payments sent directly from one party to another, bypassing financial institutions. While earlier concepts for decentralized electronic cash existed, Bitcoin is recognized as the first cryptocurrency to be practically implemented and used.

The creator of Bitcoin is known only by the pseudonym Satoshi Nakamoto, whose true identity remains unknown as of 2021. Nakamoto published the Bitcoin whitepaper on October 31, 2008, outlining a decentralized ledger system with blocks secured by cryptography, later called blockchain. On January 3, 2009, Nakamoto mined the first block, launching the first cryptocurrency. Initially, Bitcoin had no value, and coins were obtained through mining on standard computers. The first known commercial transaction occurred on May 22, 2010, when Laszlo Hanyecz paid 10,000 BTC for two pizzas, an event now celebrated as Bitcoin Pizza Day.

Bitcoin's primary distinction is being the first cryptocurrency, which enabled it to build a global community and spawn an entire industry. It established the conceptual and technical foundation for thousands of subsequent projects. The entire cryptocurrency market, now valued over $2 trillion, relies on Bitcoin's core idea: money transferable between anyone, anywhere, without trusted intermediaries like banks. Despite losing its absolute dominance, Bitcoin remains the largest cryptocurrency, surpassing a $1 trillion market cap in 2021 after reaching an all-time high of $64,863.10 on April 14, 2021, driven partly by growing institutional adoption.

Bitcoin's total supply is capped at 21 million coins, enforced by its software. New coins are created through mining, where miners package transactions into blocks and solve complex cryptographic puzzles. As a reward, miners receive a set number of bitcoins per block, which halves every 210,000 blocks, approximately every four years. Initially 50 BTC per block, the reward has halved three times to 6.25 BTC as of 2020. Bitcoin was not premined, so no coins were distributed to founders before public availability. Early miners, including Satoshi Nakamoto, accumulated large holdings due to low competition; Nakamoto is believed to own over one million bitcoins.

Bitcoin uses the SHA-256 hashing algorithm, part of the SHA-2 family, to secure its network. This algorithm is also employed by Bitcoin Cash, a fork of Bitcoin, and several other cryptocurrencies.

Bitcoin serves as a decentralized store of value, providing ownership rights similar to physical assets or units of account. However, this function is debated among enthusiasts and economists, with some believing widespread adoption could lead to a new financial system where transactions are denominated in smaller units. The smallest unit, 0.00000001 BTC, is called a Satoshi, named after the pseudonymous creator. Many view Bitcoin as digital gold, preferring to hold it long-term rather than spend it, treating it as a store of value rather than a payment method.

Bitcoin upgrades through forks. A hard fork is a non-backward-compatible protocol change, requiring all nodes to upgrade; it makes previously invalid blocks or transactions valid, and the old chain continues separately. A soft fork is backward-compatible, making only previously valid blocks or transactions invalid, and requires only a majority of miners to enforce new rules. Examples of cryptocurrencies that have undergone hard forks include Bitcoin Cash and others.

Taproot is a soft fork combining BIP 340, 341, and 342, aiming to enhance scalability, efficiency, and privacy. It introduces Merkelized Abstract Syntax Tree (MAST) and Schnorr Signatures. MAST allows senders and recipients to jointly sign transactions, while Schnorr Signatures aggregate multiple signatures into one, making multi-signature transactions look like regular ones. This can reduce transaction fees and support more complex applications, potentially laying groundwork for smart contracts on Bitcoin. While not immediately noticeable to regular users, Taproot could be a significant milestone for the network's future development.

The Lightning Network is an off-chain, layered payment protocol that uses bidirectional payment channels for instant transfers with immediate reconciliation. It enables private, high-volume, trustless transactions between parties, scaling transaction capacity without the costs of on-chain transactions and interventions.

Previously, public companies holding Bitcoin was considered unlikely due to volatility, with investors like Warren Buffett calling it a bubble. However, since 2020, several corporations have adopted Bitcoin. MicroStrategy led the way, buying $425 million worth in August and September 2020, and has since become the largest corporate holder, with 129,699 BTC as of August 30, 2022, worth over $2.5 billion. Other notable holders include Marathon Digital Holdings (10,054 BTC), Coinbase (9,000 BTC), Square Inc. (8,027 BTC), and Hut 8 Mining Corp. (7,078 BTC).

Bitcoin has become increasingly political, especially after El Salvador adopted it as legal tender in September 2021, a decision made by President Nayib Bukele despite criticism from various institutions. He has also proposed Bitcoin City, powered by geothermal energy. Other countries like Mexico and Russia have been speculated but not followed suit. Conversely, China declared all crypto transactions illegal in May 2021, leading to a crackdown on mining, forcing businesses to relocate. Despite this, China remains a significant player in the industry, according to University of Cambridge data.

Bitcoin's price is highly volatile and changes constantly, as it is a global asset. Starting from under a cent, its value has increased significantly. Prices can vary by country and exchange, so the exact value depends on location and time. Understanding Bitcoin's price requires real-time data, as it fluctuates by the minute.

Bitcoin is available on virtually all cryptocurrency exchanges, both for fiat and other cryptocurrencies. Major markets include Binance, Coinbase Pro, OKEx, Kraken, Huobi Global, and Bitfinex. For beginners, educational resources like Alexandria can guide you on how to start buying Bitcoin and other cryptocurrencies.