(abbreviation: BTC or XBT; sign: ₿) is a decentralized digital currency.
transactions are verified by network nodes through cryptography and recorded in a public distributed ledger called a blockchain.
The cryptocurrency was invented in 2008 by an unknown entity under the name Satoshi Nakamoto.
The currency began use in 2009, when its implementation was released as open-source software.: ch.
1 The word "bitcoin" was defined in a white paper published on October 31, 2008.
It is a compound of the words bit and coin.The Library of Congress reports that, as of November 2021, nine countries have fully banned bitcoin use, and a further forty-two have implicitly banned it.
In contrast, a few governments have used bitcoin in some capacity.
For example, El Salvador has adopted
as legal tender, although use by merchants remains low. [+]