Does PoA Fully Eliminate the Risk of a Sybil Attack?

PoA significantly mitigates the risk of a Sybil attack but does not fully eliminate it. A Sybil attack involves one entity creating many identities to gain disproportionate influence.

In PoA, the PoW phase requires real computational power, and the PoS phase requires real staked capital. Both mechanisms impose a high barrier to entry, making it uneconomical for a single attacker to gain a majority share through fake identities.