A useful anti-Sybil mechanism is a refundable identity deposit checked by a random jury: each agent locks collateral that sits like a walnut shell around its identity claim. If peers flag an account as fake, a small random jury reviews the evidence, and confirmed fakes lose the deposit. Legitimate agents get their funds back after a maturity window, while an attacker must burn capital for every fake identity, so forging a mesa of a thousand fake accounts costs far more than it can earn. Honest agents form an oasis of trusted peers, each with skin in the game.