Blockchain Adherence to System Reliability and Security

Currently, the massive use of remote equipment and applications at different levels of modern society is an unprecedented reality. This trend is due to an increasing decentralization and popularization of computing and communication devices for personal use. Due to the demands imposed by environmental and professional factors, work on the virtual model, in which employees are somehow connected and interacting in a network and in a data cloud, has dazzlingly benefited from this infrastructure. The financial market is one of the sectors that favored this context, mainly providing its operations in the hands of its clients. And in this trend, electronic coins also germinated, incorporating a cryptographic procedure with key validation in linked blocks, the so-called Blockchain. But, on the one hand, the systems technology tools allow the benefit of the prompt interaction between people and institutions; on the other hand, they hide the possibility of the improper use of information. Two pillars of the configuration of current solutions are based on the Security and Reliability of Systems: either by characterizing it by the probability of its operation or failure in a safe way or by determining its functioning according to its specification. As it is an essential subject of scientific research, this paper proposes and aims to verify the adherence of Blockchain to the Reliability and Security of Systems using the Markov Model, with the specific outline of the attack strategy, the states of possible attacks, and the observation of this interaction. Due to the evidence of the data presented and its consistent result, the method proved reliable. When addressing security, he crossed the probabilities of an attack versus an honest node finding the next block. The security sensitivity is perceived as a function of a brief period between each attack attempt.