How Does a Sybil Attack Pose a Threat to Quadratic Voting Systems?

A Sybil attack involves a single entity creating multiple fake identities or wallets to circumvent the quadratic cost function. Since quadratic voting is designed to empower many small votes, an attacker can split their large stake into many smaller wallets.

Each small vote is cheaper than a single large vote, effectively neutralizing the intended effect of the quadratic cost. Robust identity verification is crucial to counter this vulnerability.