What Is the Difference between a 51 Percent Attack and a Sybil Attack?

A 51 percent attack is an attack on the consensus mechanism where a single entity gains control of more than half of the network's mining power (PoW) or staked tokens (PoS). This allows them to censor transactions or double-spend.

A Sybil attack involves creating multiple fake identities or nodes to gain disproportionate influence, often in peer-to-peer or governance systems, without necessarily controlling 51 percent of the total power.