Bitcoin (BTC) is the world’s first decentralised cryptocurrency, created in 2009 by the pseudonymous Satoshi Nakamoto. It was designed as a peer-to-peer electronic cash system — a way to transfer value across the internet without banks, governments, or intermediaries. Bitcoin operates on a public blockchain: a distributed ledger maintained by a global network of computers (nodes) that verify and record every transaction. No single entity controls Bitcoin; its rules are enforced by code and consensus.
Bitcoin’s core properties: Fixed supply — only 21 million BTC will ever exist, making it deflationary by design (contrast with fiat currencies, which central banks can print at will); Halving — every ~4 years, the reward for mining new blocks halves, reducing new supply issuance; Proof of Work — miners expend real-world energy to validate transactions, making the ledger computationally expensive to attack; Pseudonymity — transactions are public but linked to addresses, not personal identities; Programmability — limited smart contract capability natively, but extended through Layer 2 networks like the Lightning Network. Bitcoin is widely regarded as “digital gold” — a store of value and hedge against inflation rather than a medium of day-to-day payments.
Bitcoin dominance — BTC’s share of total crypto market cap — is a key indicator. When dominance rises, capital is flowing into Bitcoin relative to altcoins; when it falls, altseason may be underway.
Example: $1,000 invested in Bitcoin in January 2012 at ~$6 per BTC would have grown to over $11 million at the 2021 peak of $69,000. No traditional asset class has produced comparable long-term returns, alongside equally extreme drawdowns of 80%+ in bear markets.
Learn more: Bitcoin.org — How Bitcoin Works
