Summarizing Proof-of-Stake Mechanisms and Their Practical Deployments: Applications, Attacks, Solutions, and Future Directions

In this chapter, we have first provided a concise summary of the PoS consensus mechanism, covering its key concepts and benefits. Then, we have presented notable advanced PoS mechanisms and their real-world applications. Moreover, we have reviewed PoS security properties and introduced potential attacks targeting PoS networks as well as potential approaches to mitigate them, including double-spending, Sybil, race, bribery, transaction denial, grinding, desynchronization, eclipse, long-range, nothing-at-stakes, past majority, and 51% attacks. Furthermore, we discussed the challenges faced in PoS networks and potential research directions, including stake pool formation, federated blockchain systems, and PoS shardings.