Formal Verification of Blockchain Consensus Algorithms using Model Checking

Abstract

Blockchain technology's core functionality relies heavily on consensus algorithms to maintain data integrity and security. However, the complexity inherent in these algorithms introduces significant potential for errors and vulnerabilities. This paper proposes a formal verification approach utilizing model checking to rigorously assess the correctness and security of prominent blockchain consensus algorithms, including Proof-of-Work (PoW) and Proof-of-Stake (PoS). We define formal specifications of these algorithms and employ a model checker to explore all possible states and transitions, identifying potential bugs and ensuring adherence to protocol rules. The methodology presented offers a systematic and automated means of guaranteeing the reliability of blockchain systems, a critical step towards wider adoption and trust. This work focuses on the theoretical aspects of verification, providing a framework for future practical implementation and integration within blockchain development workflows. The key contributions are a detailed specification language for blockchain algorithms and a demonstrated application of model checking to uncover subtle vulnerabilities.