Digital asset, the creation and control of which is carried out using cryptography. Accounting is usually decentralized. Data functioning is based on blockchain technology using the principle of consensus.
A chain of blocks lined up in a specific order. They are stored in a distributed registry. Each block is confirmed by the algorithm and is recorded in the blockchain upon reaching consensus. Now in plain language.
My friend was a young engineer, he just graduated from St. Petersburg State University and returned to Kiev, began working at Kievgorstroy in the sixties of the last century.