How Bitcoin was first introduced somewhere.
In 1973, the American cryptographer David Choum began working on digital cryptocurrency exchanges. Named as e-cash. In 1995, he proceeded to implement the initial form of a cryptographic electronic payment, which is Digicash. The recipient then receives money from the sender after inputting certain encrypted keys into the software.
However, this money is not like the currency (money, dollar, pound, dinar) operated in any state. Completely non-existent point. However, Satshi Nakamoto (an individual or group) successfully introduced digital cash payments without a central entity. Which is known as Bitcoin