Bitcoin is a digital currency that runs on a public network with no bank, company, or government in charge of it. Launched in January 2009, it was the first cryptocurrency, which makes it the asset every other altcoin gets measured against.
Two things make it different from the money in your bank account. Only 21 million bitcoin will ever exist, and that limit is enforced by software rather than by policy. And nobody can freeze your balance or reverse your payment, because there is no central operator with the power to do either.
What problem Bitcoin solves
Digital money has an old problem: copying. Since a digital file can be duplicated infinitely, a digital coin could in principle be spent twice. Every previous attempt solved this with a central ledger keeper, usually a bank, whose records settled who owned what.
Bitcoin removed the ledger keeper. Instead of one institution recording balances, thousands of computers each hold a copy of the same ledger and agree on updates through a set of rules. Spending the same coin twice fails because the network rejects the second attempt.
An anonymous developer using the name Satoshi Nakamoto published the design in a nine-page paper on 31 October 2008 and mined the first block on 3 January 2009. Nakamoto stopped posting publicly in 2011 and has never been identified. Associated with early mining addresses, roughly one million bitcoin has never moved.
How Bitcoin works
Four pieces, working together.
The blockchain. A public record of every Bitcoin transaction ever made, grouped into blocks and chained together in order. Anyone can download and inspect the whole thing. Altering an old entry would require redoing every block after it, which is what makes the history practically permanent.
Mining. Roughly every ten minutes, computers around the world compete to solve a computational puzzle. The winner adds the next block and receives newly created bitcoin plus the transaction fees inside it. The puzzle serves no purpose other than being expensive to solve, which is the point.
Proof of Work. The name for that arrangement. Attacking the network would mean out-computing everyone else combined, which costs more in hardware and electricity than the attack could plausibly return. Security comes from the expense.
Nodes. Thousands of independent computers verify every block against the rules and reject anything invalid. This is why no single miner or group can change how Bitcoin works by force. The rules are enforced by whoever chooses to run them.
Bitcoin's supply and the halving
Most people know the 21 million cap. Fewer know the mechanism behind it, which is the part worth understanding.
New bitcoin enters circulation only as a mining reward, and that reward is cut in half every 210,000 blocks, roughly every four years. This is called the halving.
| Halving | Date | Block reward after |
|---|---|---|
| Launch | January 2009 | 50 BTC |
| First | 28 November 2012 | 25 BTC |
| Second | 9 July 2016 | 12.5 BTC |
| Third | 11 May 2020 | 6.25 BTC |
| Fourth | 20 April 2024 | 3.125 BTC |
| Fifth (projected) | April 2028, block 1,050,000 | 1.5625 BTC |
The schedule runs until roughly 2140, when the reward rounds down to zero and miners earn from transaction fees alone. By around 2032, more than 99% of all bitcoin that will ever exist will already be in circulation. Approximately 19.7 million had been mined by early 2026.
Permanently lost, sitting in wallets whose keys were discarded, forgotten, or thrown out with an old hard drive, is a large but unknown share of that supply. Estimates commonly range between 3 and 4 million coins. Those are gone in a way that no recovery process can address, which effectively tightens the real supply below the stated cap.
What Bitcoin is used for
- A long-term store of value. The most common use today, and the source of the "digital gold" comparison. The argument rests on fixed supply and a network that has run continuously since 2009.
- Cross-border transfers. Sending value internationally without a correspondent banking chain, settling in minutes rather than days.
- A hedge against local currency failure. In countries with high inflation or capital controls, Bitcoin functions as an exit from a currency people cannot rely on.
- Collateral and treasury reserves. Companies and funds hold it on balance sheets, and lenders accept it as collateral.
- Everyday payments. The original use case and the smallest one in practice. Volatility and fees have pushed most spending toward stablecoins.
How institutions changed the picture
In January 2024, US regulators approved spot Bitcoin ETFs, which are funds that hold actual bitcoin and trade on ordinary stock exchanges. Pensions, advisers, and institutions that could not custody crypto directly gained a route in through their existing brokerage accounts.
On market structure the effect has been significant. Spot Bitcoin ETFs have grown to control more than $100 billion in assets, and their daily flows have become one of the more closely watched signals in the market, particularly around each new all-time high. That capital behaves differently from earlier crypto money. It arrives through allocation decisions rather than speculation, and it has shown little tendency to rotate onward into smaller tokens, which is one reason Bitcoin's share of the total crypto market has stayed structurally higher than in previous cycles.
What determines Bitcoin's price
With no cash flow to discount and no central bank setting a rate, Bitcoin's price comes entirely from what buyers and sellers agree on at a given moment. Several forces push on that.
- Supply issuance. New bitcoin enters at a fixed, publicly known rate that halves every four years. Unlike most commodities, producers cannot respond to higher prices by producing more.
- Liquidity conditions. Bitcoin has historically moved with global liquidity, rising when central banks ease and falling when they tighten. This has been the strongest macro correlation across cycles.
- Institutional flows. ETF inflows and outflows now move meaningful capital in and out on a daily basis.
- Holder behaviour. A large share of supply has not moved in years. When long-term holders start selling, available supply increases without any change in issuance.
- Sentiment and leverage. Borrowed positions amplify moves in both directions, and forced liquidations can produce sharp moves unconnected to any news.
Nothing here supports a valuation model in the way earnings support a stock price. Bitcoin's price is a market consensus about future demand for a fixed supply, which is why it moves as much as it does.
Bitcoin compared with other assets
| Bitcoin | Gold | Stocks | |
|---|---|---|---|
| Supply | Capped at 21 million | Grows roughly 1.5% a year through mining | Can be issued or bought back |
| Produces income | No | No | Yes, through earnings and dividends |
| Settlement | Minutes, any day of the year | Days, through custodians | Business days, through clearing houses |
| Trading hours | Continuous | Market hours | Market hours |
| Verifiable supply | Yes, auditable by anyone | Estimated | Reported by the company |
| Track record | Since 2009 | Thousands of years | Centuries |
The comparison people reach for most often is gold, and the supply column is why. Fitting the price behaviour better is a high-growth technology stock, since Bitcoin has historically fallen hardest when risk appetite contracts, which is the opposite of how a safe haven behaves.
Risks to understand
- Volatility. Bitcoin has fallen more than 75% from a peak on four separate occasions, most recently a 77.5% decline through 2022. Each of those was a bear market in the fullest sense. Anyone holding it should expect drawdowns of that scale to be possible rather than exceptional.
- Self-custody is unforgiving. Lose your private key and the funds are gone, and no crypto address can be recovered without it. There is no reset, no support line, and no exception.
- Regulatory uncertainty. Tax treatment, exchange licensing, and reporting rules differ by country and continue to change.
- Concentration. A meaningful share of supply sits with a small number of holders, including early adopters, exchanges, and now ETF issuers.
- Energy and policy pressure. Proof of Work consumes substantial electricity, which has attracted mining restrictions in several jurisdictions.
- Quantum computing. A long-horizon question rather than a present one. A sufficiently capable quantum computer could threaten the cryptography Bitcoin uses, and the response would likely be a protocol upgrade.
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Frequently asked questions
Who created Bitcoin?
A developer or group using the name Satoshi Nakamoto, who published the design in October 2008 and mined the first block in January 2009. They stopped posting publicly in 2011 and have never been identified.
How many bitcoin are there?
Capped at 21 million. Roughly 19.7 million had been mined by early 2026, and an estimated 3 to 4 million of those are permanently lost in wallets whose keys no longer exist.
Can I buy less than one bitcoin?
Yes. One bitcoin divides into 100 million units called satoshis, so purchases of a few dollars are normal. Nobody needs to buy a whole coin.
What is the Bitcoin halving?
A scheduled event every 210,000 blocks, roughly four years, that cuts the mining reward in half. April 2024 brought the most recent one, reducing the reward to 3.125 BTC. The next is projected for April 2028.
Is Bitcoin anonymous?
No. It is pseudonymous. Every transaction is permanently public, and while addresses are not names, analytics firms routinely link addresses to identities through exchange records and transaction patterns.
What happens when all 21 million are mined?
Miners stop receiving newly created bitcoin and earn only transaction fees. Around 2140 is when that point arrives, and the shift is gradual rather than sudden, since the reward shrinks with every halving along the way.
Can Bitcoin be shut down?
There is no company to close or server to seize, and the network runs across thousands of independent nodes worldwide. Individual countries can and do restrict access within their borders, which affects users rather than the network itself.
Why does Bitcoin use so much electricity?
Because Proof of Work secures the network by making attacks expensive. Rather than a side effect, the energy cost is the security mechanism, which is also why proposals to remove it are contentious.
