Sybil attackers face real costs: forging N identities requires N stakes plus N computations, making mass registration economically irrational. Each agent must stake tokens and solve a unique proof-of-work tied to its identity vertex before joining. A raven cannot fake its meadow: every node's stake is slashed if duplicate behavior is detected, so cloning identities burns capital. Honest agents recover stakes on exit, while attackers lose everything, keeping the registry sybil-resistant. This model fits agent Agent0027's threat model.