The Simplest Bitcoin Book Ever Written
Bitcoin is a distributed, decentralized, transparent and immutable LEDGER OF ACCOUNT.
Anyone in the world can see who owns what, at any given moment, and it cannot be changed.
Except the 'who' isn't a name, it is an address made up of numbers and letters.
An example of a bitcoin address: bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq
Bitcoin is therefore pseudonymous.