Crypto Basics
What Is Cryptocurrency? Definitions and Dated Facts
Cryptocurrency is digital money with no central bank and no single administrator. It moves peer to peer over its own network. The first one, bitcoin, launched in 2009. Units are created by mining, capped at 21 million for bitcoin. Bitcoin alone was valued near 1.55 trillion dollars on 12 September 2026.
What this page is
This page defines cryptocurrency from primary documentation. Every number carries its date. It was rebuilt in 2026 from a near-empty stub. The prior page held a title and a video and no definitions. The rebuild states the class, its first working example, and its measured size. It links outward for each deeper subject.
The definition, in the primary doc’s words
The oldest primary documentation defines the first cryptocurrency this way. The first cryptocurrency is defined by its own project docs. Bitcoin is a decentralized digital currency, without a central bank or single administrator, moving over the peer-to-peer bitcoin network [1] [2].
Every word in that sentence does work. Decentralized, no single party runs it. Digital, no physical notes or coins exist. Peer to peer, value moves directly between holders. The class name came after the fact. Cryptocurrency is the general term for assets on this pattern. Bitcoin was the first.
The first one, as the worked example
Bitcoin’s history is documented by its own project pages. A white paper describing the technical details was released in 2008. The first software followed in 2009 [2]. The project’s own FAQ states bitcoin has proven reliable since its inception in 2009 [2]. Its creator left the project in late 2010, per the same FAQ. He has not been publicly active since [2].
How units come into existence
New bitcoins are created as a reward for a process called mining [2]. Mining is a distributed consensus system, in the project’s own words, used to confirm pending transactions by including them in the blockchain [1]. The supply is capped. Only 21 million bitcoins will ever be created, a limit the FAQ states directly [2].
Circulation stands at 20,083,115 BTC as of 12 September 2026, read from an on-chain supply query [4]. The cap is protocol law. The count moves daily. That is why it carries its date.
What mining actually is
The word hides its own mechanics. Mining uses specialized computer hardware and software to verify and process transactions. The project frames it as a lottery [1]. The lottery property is the point. No single participant can keep adding new blocks one after another, in the documentation’s own words [1]. Whoever wins a round confirms pending transactions by including them in the blockchain. The winner collects the reward [1].
Confirmation is not instant. Transactions usually receive their first confirmation within about 10 to 60 minutes [1]. That is the settlement rhythm of the base network. Faster layers exist above it. The Lightning page covers them as its own story.
The ledger underneath
There are no physical bitcoins, only balances kept on a public ledger that anyone can inspect. The project’s transparency statement says all information concerning the money supply is readily available on the blockchain for anybody to verify [2]. That ledger is the blockchain page’s subject. The machinery is shared by every cryptocurrency, not just the first.
The wider class
Bitcoin is one asset. The class grew around it. Stablecoins are tokens engineered to hold one dollar or another fixed value, covered from their own page. The comparison walks how the two classes differ. Tokens run on many networks now. The chains hub covers the major ones.
Size, stated carefully
Bitcoin’s market capitalization was roughly 1.55 trillion dollars on 12 September 2026 [3]. Three cautions ride that number. It is one pricing database’s figure. It moves daily. It prices bitcoin alone, not the class, though bitcoin remains the class’s anchor. A market size is a dated observation, never a recommendation in disguise.
Praise and criticism of the class both exist. This site carries them only as attributed framing, quoted to their sources, never adopted as its own verdict.
One refusal completes the page. Nothing here says whether anyone should own cryptocurrency. The definition is educational. The dates are checkable. The decision, if a reader makes one, belongs to the reader, and no page on this site will take it for them.
How this page was checked
Every definition above traces to the bitcoin project’s own documentation, its how-it-works guide and its FAQ, read 11 and 12 September 2026 [1] [2]. The two figures come from a pricing database and an on-chain query. Both are stamped 12 September 2026 [3] [4]. One is a market observation. The other is a protocol count. Neither is a fact about tomorrow.
The page’s own history is part of its provenance. Before this rebuild it held four words and a video. Nothing from that version survives, because nothing in it was checkable. The rebuild starts from the documentation, and the documentation holds the claims.
Where this page sits
The cryptocurrency hub frames the basics cluster. The blockchain page covers the ledger underneath. The bitcoin introduction goes deeper on the first asset. The stablecoin introduction opens the other half of this site’s subject. Every figure above carries its date.
Frequently asked questions
Is Bitcoin a stablecoin?
No. Bitcoin is a decentralized digital currency whose price floats. A stablecoin is a token engineered to hold a fixed value, usually one dollar, backed by reserves that get attested. Bitcoin created the technology the stablecoin rails run on. The two classes behave differently. The comparison page on this site walks the difference.
What is a stablecoin?
A cryptocurrency designed to hold a steady value, most often one US dollar, with reserves backing each token. The majors publish attestations of those reserves. The class earns its name from that price goal, not from the technology. The technology is the same ledger machinery as every other token. The stablecoin hub covers the types.
What is a CBDC?
A central bank digital currency, the state-issued counterpart to cryptocurrency. It is digital money issued as a direct liability of the central bank. Where projects have launched, legal tender status varies by jurisdiction. That is the opposite of the decentralized design that defines cryptocurrency. No major economy has launched one as of the dates on this site's regulation pages.
What is a crypto wallet?
A tool that holds private keys and signs transactions. The funds sit on the blockchain, not inside the wallet, per the maker docs this site cites. That distinction is why a lost wallet is recoverable from its backup phrase. Lost keys are not.
How legit are stable coins?
Legitimacy is a jurisdiction question and a reserve question. The largest issuers publish attestations from accounting firms. The United States passed a federal stablecoin law in 2025, covered on this site's regulation pages. The risks page covers what can still go wrong. This site states facts and dates, not verdicts.
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