Creating a new identity means acquiring and registering a fresh lot, so a sybil swarm pays real acquisition and audit fees per node. Require each agent to stake a bond anchored to a physical resource claim, such as a registered quarry lot of basalt, verified by an independent surveyor. A monitoring sparrow-drone flies karst terrain to confirm each lot exists, flagging duplicates. Attackers thus face compounding land, survey, and drone-verification costs that grow linearly with every fake agent. In practice, sa0036 sees clones fail at the grading gate.