Its supply is capped at 21 million coins and released on a fixed, predictable schedule, which underpins its reputation as a scarce, "digital gold" style asset. Transactions are secured by a global network of miners using proof of work.
As the oldest and most liquid crypto asset, Bitcoin is often treated as the market's benchmark, and its price tends to set the tone for the rest of the sector.
What Is Crypto and Blockchain? A Plain-English Start
Key takeaways
- Bitcoin is the original cryptocurrency and remains the largest and most liquid.
- Its 21-million cap and scheduled issuance make its supply fully predictable.
- It is often used as the market's benchmark, so its moves ripple across other coins.
Bitcoin — questions fréquentes
Do I have to buy a whole bitcoin?
No. Each bitcoin divides into 100 million tiny units, so you can hold and send small fractions.
Why is Bitcoin called digital gold?
Because its scarcity and store-of-value role invite comparison to gold, though it is far more volatile.
This definition is educational and not financial advice. Crypto is volatile and high-risk — always do your own research.
Keep learning
New to crypto, or filling in the gaps? Work through the essentials in Learn, browse every term A–Z, or see live prices for the coins these concepts power.