Indeed, for more nuance here's a full explanation of the problem being dealt with by various Proof of Whatever algorithms: https://en.wikipedia.org/wiki/Sybil_a

Indeed, for more nuance here's a full explanation of the problem being dealt with by various Proof of Whatever algorithms: https://en.wikipedia.org/wiki/Sybil_attack https://en.wikipedia.org/wiki/Sybil_attack They always rely on scarcity of something: scarcity of processing power, scarcity of being on the ledger of the blockchain and owning an amount of currency, scarcity of hard disk space, etc.