Blockchain

The latest technology, interest in which has grown along with the popularity of cryptocurrency. This is used today for storage and processing of personal data and identification, in marketing and computer games.

A continuous sequential chain of blocks containing information, formed according to certain rules. The connection between the blocks is provided not only by numbering, but also by the fact that each block contains its own hash sum and the hash sum of the previous block.

Unlike the usual forms of database, these records cannot be changed or deleted. The only possible change is addition of new blocks.