Summarize the following text:
Bitcoin (abbreviation: BTC[a] or XBT[b]; sign: ₿) is a protocol which implements a highly available, public, permanent, and decentralized ledger. In order to add to the ledger, a user must prove they control an entry in the ledger. The protocol specifies that the entry indicates an amount of a token, bitcoin with a minuscule b. The user can update the ledger, assigning some of their bitcoin to another entry in the ledger. Because the token has characteristics of money, it can be thought of as a digital currency.[10]

Bitcoin 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 person or group of people using the name NAME_1.[11] The currency began use in 2009,[12] when its implementation was released as open-source software.[7]: ch. 1  The word "bitcoin" was defined in a white paper published on October 31, 2008.[3][13] It is a compound of the words bit and coin.[14]

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.[15] A few governments have used bitcoin in some capacity. El Salvador has adopted Bitcoin as legal tender, although use by merchants remains low.[16] Ukraine has accepted cryptocurrency donations to fund the resistance to the 2022 Russian invasion. Iran has used bitcoin to bypass sanctions. Do not include the following keywords: entry, transaction, invasion, capacity
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