Despite its young (adolescent by human standards) age, blockchain is now very popular. News about it appears in the media daily, theses are defended, monographs and dozens of specialized journals with hundreds of scientific articles are published, apocryphal stories of blockchain circulate on social networks in the epic spirit of Homer and the Prophetic Boyan - "The Saga of Public Keys", "The Legend of Bitcoins, Economic Left and Cyberpunks of the XXI Century", etc. In short, a picture of the...