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Altcoin

In simple terms

Altcoin is short for alternative coin and means any cryptocurrency that is not Bitcoin. Ethereum, Solana and thousands of far smaller projects all sit under the label.

Definition

Any cryptocurrency other than Bitcoin.

In depth

Altcoin is a term of convenience rather than a technical classification. It covers independent Layer 1 networks with their own validator sets and consensus rules, forks of existing chains, and tokens issued by a contract on another chain that inherit that chain's security and fee market. Because the category spans networks with years of continuous operation and contracts deployed in an afternoon, it carries no implication about decentralisation, liquidity, custody arrangements or code quality.

How does Altcoin work?

Altcoin is a label applied from outside rather than a property of the software. Some altcoins run an independent blockchain with their own validators and consensus rules. Many more are tokens issued by a contract on someone else's chain, most often Ethereum, which means they inherit that chain's security and pay its fees. The category spans networks with long operating histories and tokens created in an afternoon, so the word tells you nothing about how sound any particular one is.

An example

Two assets both called altcoins can be structurally unalike. One might be a Layer 1 with thousands of independent validators and a six-year record. The other might be a token deployed last week where a single address holds most of the supply and can sell into any buying that appears. The shared label tells you only that neither is Bitcoin.

Figures are illustrative only.

What beginners get wrong

  • A low price per unit does not make a coin cheap. What matters is the total value of every unit in circulation, not the price of one.
  • Thin liquidity is the risk most often underestimated: something that looks tradeable can be hard to sell in size without moving the price against you.
  • Most tokens ever launched are now worth close to nothing. Looking back at the survivors makes the category appear far kinder than it was to live through.

Related terms

Educational only — not financial advice.