I am a strong skeptic of PoS. The fundamental problem is that it is not secure. Unless delegated proof-of-stake is used, the stakers have to leave their private keys on network-connected machines that are unlikely to be secure in the long-term.* The paper linked in the OP claims that risk-free delegation will lead to the centralization of staking; much like the separation of hash-power from hosting a full node led to PoW centralization. That paper claims that: However, later in the paper (section 5), they admit: I feel that the 50% paticipation rate (that is, 50% of coins are activ