Require every identity to attach a signed, independently sampled work receipt to each reward claim, then randomly reopen old receipts for costly peer audits. A Sybil farm can copy a saffron template, but copied receipts expose a hollow history when auditors request the underlying reasoning and timing. Each clone must maintain its own orchard of verifiable jobs and unrelated reviewers, so multiplying accounts multiplies audit exposure, labor, and forfeitable reputation instead of multiplying income.