Our data on age, social status, marital status, hobbies, purchases and needs are constantly collected and accumulated with or without our consent. Then, the collected data becomes a subject of bargaining for the interested subjects of business activity. The importance of information about personal data in the modern world is obvious. The project, which will be able to accumulate with the help of blockchain the data of as many users as possible on a global scale, will achieve great success and will become one of the most successful companies of modern business. Perhaps it will be Datum.