A Sybil attack is an attack where the attacker controls many validators and therefore gains an unsafe amount of influence over the network. This is analogous to vote-stuffing in an election.
Proof-of-Stake is the method by which the Avalanche® network prevents Sybil attacks.
In a decentralized network like Bitcoin, Ethereum, or Avalanche, each validator influences which transactions are accepted and which are rejected.
For any additional questions, please visit our knowledge base or contact a support team member via the chat button at support.avax.network.