Satoshi

A satoshi, or sat, is the smallest unit of bitcoin, equal to one hundred-millionth of a coin: 1 BTC = 100,000,000 sats. It is named for bitcoin's pseudonymous creator, Satoshi Nakamoto. With the supply capped at 21 million BTC, the maximum number of satoshis is 2.1 quadrillion.

Why it matters

Divisibility is a core monetary property, and the satoshi gives bitcoin more of it than any physical money. A unit priced in the tens of thousands of dollars would be useless for small payments if it could not be subdivided; because it splits into 100 million pieces, bitcoin works at any scale from micropayments on the Lightning Network to institutional settlement. The unit also matters psychologically: newcomers often assume they must buy a whole coin, when in practice bitcoin is bought and spent in sats. If bitcoin's value rose far enough, prices could simply be quoted in sats without any protocol change.

In the gold vs bitcoin debate

Gold's divisibility is real but physical: cutting metal into ever-smaller pieces eventually produces amounts too small to handle, verify, or trade, which is why history paired gold with silver and copper for everyday change. Bitcoin's divisibility is numerical and effectively free, precise to eight decimal places at the base layer and finer still on layers above it. In the comparison of monetary properties, divisibility is one criterion where bitcoin holds a clear structural edge, while gold's advantages lie elsewhere. Sats are now the default denomination on the Lightning Network and in most bitcoin-native applications.