Overview
Bitcoin is the first and largest cryptocurrency by market cap, created in 2009 as a peer-to-peer electronic cash system. It introduced proof of work, a public ledger, and a fixed supply of 21 million coins, establishing the template for decentralized digital money. Bitcoin remains the most recognized and most valuable asset in the cryptocurrency market.
How It Works
Bitcoin uses a proof-of-work consensus where miners compete to add blocks of transactions to a public ledger, with difficulty adjusting to keep block time near ten minutes. Its supply schedule halves roughly every four years, gradually reducing new issuance until the 21 million cap is reached. Ownership is controlled by private keys, and every transaction is recorded permanently on the ledger.
Why It Matters
Bitcoin established the core value propositions of crypto: permissionless transfers, censorship resistance, and a verifiable, scarce monetary supply. It is widely considered a store of value and the safest network in the industry by hash power and operating history. Its limited scripting language is why more complex applications, such as smart contracts and DeFi, were built on other chains like Ethereum.
Related Concepts
Bitcoin runs on Proof of Work and is secured by Miners. Its layer of innovation now includes Ordinals and token standards built on its base layer, and it contrasts with Proof of Stake chains for anyone comparing consensus designs.