The Byzantine Fault Tolerance (BFT) is a type of computing systems that reach consensus through a certain mechanism. This mechanism allows a certain number of components to fail, and imperfect information can also exist. Bitcoin is an example of a Byzantine Fault Tolerant cryptocurrency. The term derives from Leslie Lamport’s, Robert Shostak’s and Marshall Pease’s paper named “The Byzantine Generals Problem” published in 1982. Accordingly, the Byzantine Fault Tolerance has relevance also far outside the cryptocurrency world.