What Is Bitcoin? The Network, the Cap, the Record

The definition, in the protocol’s own words

Bitcoin is a decentralized digital currency. It has no central bank and no single administrator. Payments move peer to peer, across the bitcoin network itself ^[1]. That is the definition the protocol’s own documentation carries, and this page keeps it.

The machinery behind the definition is a ledger. Every payment is recorded. The records are public. Anyone can hold a full copy and verify it themselves ^[1]. No operator sits in the middle with the power to edit the record quietly. That property, more than any price fact, is what the word decentralized is pointing at.

How a payment settles

A payment travels in three steps. The sender signs it with a private key. The network receives the signed payment. Miners group valid payments into blocks and chain the blocks by cryptography ^[1]. Each new block buries the older ones deeper. The deeper a payment sits, the harder it is to reverse. First confirmation usually lands within ten to sixty minutes, per the protocol’s own walkthrough ^[1].

That timing is a property, not a defect. Finality in this system is probabilistic and arrives with depth. Faster payment layers exist on top of the network, and the Lightning page covers the one this site documents.

The ledger, open by design

The protocol’s FAQ describes the system as transparent and neutral. Its own words: all information concerning the Bitcoin money supply itself is readily available on the blockchain for anybody to verify ^[2]. There are no physical coins. Balances live on the public ledger. The openness is structural, which is why this site can quote protocol documents for its basic claims rather than intermediaries.

The two dates, 2008 and 2009

The origin carries two dates, and both matter. A white paper describing the design was published in 2008. The software launched the following year. The protocol’s FAQ states the network has been reliable since its inception in 2009 ^[2]. Old copy sometimes blurs the two dates into one event. They are two. The idea came first. The network followed.

The author is a pseudonym. Satoshi Nakamoto published the paper and the first software, then stepped away. The FAQ’s own words: Satoshi left the project in late 2010, without revealing much about himself ^[2]. One correction rides here. An older version of this page said the pseudonym went quiet in 2011. The protocol’s documentation says late 2010. The documentation wins ^[2].

The cap, stated exactly

No more than 21 million bitcoin will ever be created. That is the FAQ’s own sentence, quoted in place ^[2]. New coins enter circulation only as mining rewards, a competitive and decentralized process the FAQ describes ^[2]. The mining family pages carry how that process works and how the reward schedule halves over time.

The cap is a protocol rule, not a promise. It sits in the software every participant runs. That is what makes it different from a company’s pledge to limit something. A pledge has an owner who can reconsider. The cap has code that would need the network’s near unanimity to change.

The size, dated

Market capitalization was about 1.55 trillion dollars on 12 September 2026, per a market-data provider’s read ^[3]. The figure is a snapshot, not a property. Older copy said hundreds of billions. That was true once. The dated read is the honest form, and the figure moves daily.

The price page holds the market record in full, with the same dating discipline. The all-time high there carries its date too, because a high without a date is half a fact.

The reception, kept attributed

Older copy praised bitcoin for disruptive potential and criticized it for illegal-use associations, thin consumer protection, and volatility. This page keeps that framing attributed and drops the verdicts. Both praise and criticism are positions people hold. The protocol’s FAQ carries consumer-protection and regulation questions in neutral form ^[2]. The record this site keeps is the neutral form.

Volatility itself is a documented property, not an opinion. The price record, including the 2017 peak and the 2018 drawdown, sits on the price page with dates. The history page carries the timeline. Neither page predicts the next move, and this one does not either.

What bitcoin is not

Bitcoin is not a stablecoin. It targets no price. Its value floats against every currency, by design. The stablecoins intro covers the tokens that do hold a target, and the comparison page sets the two ideas side by side on facts.

Bitcoin is also not a company and not a product. There is no issuer, no attestation regime, no reserve report. Those documents exist for instruments that owe somebody something. Bitcoin’s structure has no counterparty of that kind, which is a difference, not a superiority. Each design carries its own risks.

Where this page sits

The bitcoin hub opens the family and links every page in it. The mining pages cover the process that issues new coins. The Lightning page covers the payment layer built on top. The stablecoins hub holds the other half of this site’s mandate, with the same sourcing rules on every figure.