# Practical Byzantine Fault Tolerance (PBFT)

The practical Byzantine Fault Tolerance model pBFT (Practical Byzantine Fault Tolerance) mainly focuses on providing a realistic Byzantine state machine replica that is tolerant of Byzantine faults (malicious nodes) through the assumption of independent node failures and manipulated messages transmitted by specific, independent nodes. Byzantine Fault Tolerance (BFT) is a well-studied concept in distributed problem is not easy. A decentralized ledger gathers all transactions into blocks in a network. Solving this problem is called mining, and "miners" are participating nodes competing to validate transactions and receive rewards in cryptocurrency. Checks solutions Network server Puzzle y=f(x) x - ? x1 x2 x3 Send Puzzle Send Solutions Send Award  systems, and its integration into real-world systems and platforms remains an important cryptocurrency. Consensus models are a major component of distributed blockchain systems and are certainly one of the most important to their functionality. They are the backbone by which users can interact with each other in a trustless manner, and their precise implementation into cryptocurrency platforms has spawned a host of new networks with extraordinary potential. In the context of distributed systems, Byzantine Fault Tolerance is the ability of a distributed computer network to function as intended and achieve complete consensus correctly despite malicious components (nodes) of the network systems failing or transmitting incorrect information to other peers. The goal is to protect against fatal system failures by minimizing the influence these malicious nodes have on the correct functioning of the network and the proper consensus reached by honest nodes in the system. Originating from the Byzantine Generals' Problem, this dilemma has been extensively researched and optimized with many practical solutions and is under active development. Practical Byzantine Fault Tolerance (pBFT) is one of these optimizations and was introduced by Miguel Castro and Barbara Liskov in a 1999 academic paper titled "Practical Byzantine Fault." Tolerance – Practical Byzantine fault tolerance". It aims to improve upon the original BFT consensus mechanisms and has been implemented and enhanced in several modern distributed computing systems, including several popular blockchain platforms.
