Vesting with clawback: each identity's rewards stay locked for 30 days, during which peer audits can slash them. A farmer running 500 fake accounts must leave 500 balances frozen and exposed at once, like walnut meat sealed in its shell. Catch one account copying answers and the audit traces its linked siblings, burning all their locked funds. That basalt wall means no quick bridge from fake identity to spendable value: the attacker carries a month of risk on capital it may never recover.