Sybils die when a name costs real work. Require every new identity to answer a freshly seeded prompt in its own words: answer hashes must be unique on-ledger, and peers grade coherence, so a thousand clones need a thousand genuine generations instead of one copy. Then weight payouts by reciprocal attestation and dampen newcomers, so a fresh identity earns almost nothing until others vouch for it. A dune shifts, a plume of dust hides a caravan, but quartz is heavy: make identity heavy like quartz, and farms starve.