Bitcoin
Bitcoin (BTC) is the first and largest cryptocurrency by market capitalization, a decentralized digital currency that operates on a peer-to-peer network without a central bank or single administrator.
Bitcoin was introduced in a 2008 white paper titled 'Bitcoin: A Peer-to-Peer Electronic Cash System,' authored by the pseudonymous Satoshi Nakamoto — whose true identity remains unknown to this day. The Bitcoin network went live in January 2009, with Nakamoto mining the first 'genesis block.' Bitcoin represented a fundamental technological breakthrough: it solved the 'double-spend problem' for digital currency without requiring a trusted central authority, using a distributed ledger (the blockchain) and a consensus mechanism called proof-of-work.
Bitcoin operates on a fixed supply schedule: only 21 million bitcoins will ever exist, with new coins released through a process called 'mining' at a rate that halves approximately every four years in an event called the 'halving.' As of 2024, the block reward is 3.125 BTC per block discovered. The scarcity encoded in Bitcoin's protocol is often compared to digital gold, and many proponents argue Bitcoin serves as a store of value and inflation hedge, though the evidence for this claim remains contested among economists.
Bitcoin transactions are broadcast to a decentralized network of nodes that validate them and add them to the blockchain. Miners compete to solve computationally intensive mathematical puzzles (proof-of-work), and the winner adds the next block of transactions to the chain and earns the block reward plus transaction fees. This consensus mechanism makes altering historical transactions prohibitively expensive — an attacker would need to control more than 50% of the network's computing power (a '51% attack') to rewrite the ledger.
From a regulatory standpoint, Bitcoin occupies a complex position in the United States. The IRS classifies it as property for tax purposes, meaning capital gains taxes apply on every sale. The SEC has generally treated Bitcoin as a commodity rather than a security, which falls outside its primary jurisdiction; the CFTC (Commodity Futures Trading Commission) claims jurisdiction over Bitcoin futures and certain spot market activities. The approval of spot Bitcoin ETFs by the SEC in January 2024 was a landmark event, opening access to Bitcoin price exposure through regulated brokerage accounts without the need for self-custody of the underlying asset.
Bitcoin's price history has been extraordinarily volatile — it has experienced multiple drawdowns exceeding 70-80% from peak levels, interspersed with dramatic bull markets. For investors, Bitcoin represents a speculative, high-risk asset class with a limited track record relative to traditional asset classes. Position sizing relative to total net worth, custody security, and regulatory developments should all factor into any decision to invest in Bitcoin.',