This article discusses the basic concepts in the field of blockchain technology, analyzes various types of blockchains and algorithms for achieving consensus. The advantages and disadvantages of various technologies are considered, their primary areas of application are determined. It is shown how on the basis of the analysis performed, the types of blockchain and the algorithm for reaching consensus are most suitable for the implementation of an electronic document management system The developed software that implements document protection functions using blockchain technology is presented.

Keywords: blockchain, transaction, validator, patent law, secured workflow, blockchain classification, public blockchain, private blockchain, consensus algorithm, model Proof by work, model Proof of shares, model Delegated proof of shares, hybrid model Prof of Work

The article reveals the role of the information space in modern education. The conclusion is made that it is important to correctly assess the possibilities of a new type of information-digital space, fight not only its shortcomings, but also create the necessary conditions within the framework of pedagogical education for actualizing and shaping the future teachers of positive, socially significant features that are in demand in the 21st century .

Keywords: information, information-digital space, information technology, student, digital literacy, technological tools, computer programs, digital technology, multimedia product

This article presents the rationale for the selection of measuring instruments (strain gauges) for testing light steel thin-walled structures (LSTC) to determine the stress-strain state. Article discrebes in detail optimal sensor's installation locations, the required measures for correct value.

Keywords: thin-walled profile, test, frame, strain gauge, compression, tension, tension, bending, loss of stability