A Comment on "e-PoS: Making PoS Decentralized and Fair"

Proof-of-Stake (PoS) is a prominent Sybil control mechanism for blockchain-based systems. In “e-PoS: Making PoS Decentralized and Fair,” Saad et al. (TPDS’21) introduced a new Proof-of-Stake protocol, e-PoS, to enhance PoS applications’ decentralization and fairness. In this comment paper, we address a misunderstanding in the work of Saad et al. The conventional Proof-of-Stake model that causes the fairness problem does not align with the general concept of Proof-of-Stake nor the Proof-of-Stake cryptocurrencies mentioned in their paper.