Detailed Definition
The Satoshi (often abbreviated as sat) is the smallest unit into which a Bitcoin can be divided. One Satoshi equals 0.00000001 BTC, meaning there are 100 million Satoshis in a single Bitcoin. This granularity was introduced to allow the network to handle micro‑transactions and to provide flexibility for pricing, billing, and smart‑contract logic when dealing with very small values.
Origin
- Named after Satoshi Nakamoto, the pseudonymous individual or group that published the Bitcoin whitepaper in 2008.
- The term reflects the foundational ideology of decentralisation and open‑source development.
Practical Uses
- Micro‑transactions: Enabling payments for content, services, or goods that cost fractions of a cent.
- Mining rewards: New bitcoins are issued in whole units, but fees and rewards are often expressed in Satoshis for precision.
- Exchange quoting: Many exchanges display order books and prices in Satoshis to reduce decimal noise.
Technical Importance
- Script simplicity: Transaction outputs can be set to any number of Satoshis, allowing nuanced control over fund allocation.
- Economic modeling: Analysts use Satoshis to model supply‑side dynamics, as the total supply of 21 million BTC translates to 2.1 quadrillion Satoshis.