What is Bitcoin (BTC)?

Bitcoin is a payment network with no operator and a currency with no issuer. Roughly every ten minutes, the computers securing it compete to append a block of transactions; the winner is paid in newly created bitcoin, and that payment is the only way new bitcoin comes into existence. No committee sets the amount. It is written in software that thousands of independent nodes enforce, and changing it would require nearly all of them to agree — which is the entire proposition.

The supply cap is 21 million, and the issuance rate halves about every four years. Since April 2024 each block pays 3.125 BTC; from roughly 2028 it will pay 1.5625. More than 19.9 million have already been mined, so the remaining issuance is a rounding error against the float. Bitcoin's monetary policy is finished in every way that matters; what is left is distribution.

Who created it

A pseudonymous author or group publishing as Satoshi Nakamoto released the whitepaper in October 2008 and the first software in January 2009, then stopped posting in 2011 and has never been identified. The coins mined in the earliest months, estimated around a million BTC, have never moved. The anonymity is not trivia: a founder who could sell, testify, or be pressured is a risk that Bitcoin uniquely does not carry, and every subsequent network carries in some form.

What it is actually used for

Overwhelmingly, it is held. The everyday-payments case was the original pitch and has not materialised at scale on the base layer, where roughly seven transactions per second and ten-minute blocks were never going to compete with card rails. Payments happen on the Lightning Network, which is real and useful and small. What Bitcoin does at scale is store value in a form nobody can dilute, and settle large amounts with finality.

Four distinct kinds of demand, and they behave differently in a drawdown.

• Long-term holding as a scarce asset, the largest category by far. Unlike gold, it has a verifiable supply and a portable settlement layer.
• Institutional allocation through spot ETFs, which since 2024 have given pensions, advisers and funds a route that needs no custody expertise. This is the flow that has driven 2026's rallies and, when it reverses, its declines.
• Corporate treasury reserve, a strategy Strategy pioneered and dozens of smaller companies copied. It works in one direction and is being tested in the other.
• Settlement and remittance where the alternative is worse — capital controls, failing currencies, or correspondent banking that takes three days.

Bitcoin dominance — its share of total crypto market value — is the number to watch for how these are balanced. It rises when capital is defensive and falls when risk appetite spreads to smaller assets. In 2026 it has generally risen, which tells you what kind of market this has been.

There is no allocation, no treasury, no team tranche and no unlock calendar. Every bitcoin that exists was mined, and the schedule was set in 2009 and has run untouched since. That is not marketing — it is the one genuinely unusual thing about Bitcoin's supply, and no asset launched since has matched it.

The halving and what it now means

Every 210,000 blocks the reward halves. April 2024 took it from 6.25 to 3.125 BTC; around 2028 it goes to 1.5625. New issuance is already under 1% of supply per year, so the halving's effect on price has necessarily diminished — you cannot keep halving something that has become small and expect the same impact. Its remaining significance is to miner economics, where each halving forces a consolidation among operators whose electricity costs no longer work.

The security budget question

Miners are paid by the block subsidy plus transaction fees. The subsidy trends to zero, which means that at some point fees have to carry the entire cost of securing the network. Today they do not come close. This is the most serious open question in Bitcoin's design, it is decades away, and nobody has a settled answer — anyone telling you otherwise is selling something.

Who holds the float

The supply is fixed; the ownership is not. Spot ETFs and corporate treasuries have absorbed a large share of the liquid supply since 2024. Strategy alone holds around 846,000 BTC — roughly 4% of all bitcoin that will ever exist — bought at an average of $75,416 for about $63.8bn. Concentration of that kind is new in Bitcoin's history and its consequences are still being discovered.

Bitcoin cannot be staked. It uses proof of work, not proof of stake: the network is secured by electricity and hardware, not by locked coins, so there is no protocol mechanism that pays you to hold.

Anything advertising a yield on bitcoin is doing something else, and the distinction is where people lose money. Lending it to a platform makes you that platform's unsecured creditor — the lesson Celsius and BlockFi taught in 2022. Wrapping it for use on another chain adds a custodian or a bridge. Selling covered calls is a real strategy with real assignment risk. None of these is staking, and none carries the protocol's guarantee, because there is no protocol involvement at all.

Why bitcoin fell in 2026

Bitcoin set an all-time high of $126,198 in October 2025 and fell roughly 50% from it, reaching the high $50,000s by June 2026 before recovering to the high $80,000s by late September on near-$1bn daily ETF inflows and a short squeeze.

The causes were mostly not crypto-specific. Capital rotated into AI equities, geopolitical tension raised the discount on risk assets, and the Federal Reserve raised rates rather than cutting them. Underneath, the mechanism was a leverage unwind rather than a single liquidation event — a slower, grinding decline instead of the sharp capitulation traders were positioned for. That distinction matters: leverage unwinds take longer to finish and they punish averaging down.

For context, a 50% drawdown is not unusual for Bitcoin. It is roughly the median bear market of its history, and every previous one was followed by a new high. That is a description of the past, not a forecast, and the holder base is different now in ways the historical record does not cover.

The new concentration risk

The institutionalisation that lifted Bitcoin is also its newest fragility. ETF flows are a two-way pipe: the same mechanism that bought $1bn in a day can sell. And the corporate treasury trade has started to show its seams — Strategy sold bitcoin in 2026 for the first time since 2022, first 32 BTC in late May, then 3,588 BTC for about $216m in July, to fund dividends on its preferred stock. Both sales were small against an 846,000 BTC position. What they establish is that the position is not, in fact, never-sell, and that the dividends have to come from somewhere when the equity route closes.

Regulatory and structural

Bitcoin itself has the clearest regulatory status of any digital asset — the CFTC treats it as a commodity and US spot ETFs exist. The exposure is at the edges: exchanges, custodians and the on-ramps, where rules still shift. The CLARITY Act would have settled the wider market structure question; the Senate blocked it in September 2026.

Custody is the risk you control

Most bitcoin ever lost was lost to a failed exchange or a mishandled key, not to a protocol failure — there has never been one. Self-custody moves the risk from someone else's balance sheet to your own competence, which is an improvement only if you are actually competent with it.