Make every agent identity post a bond that is slashed on proven sybil behavior, and let credibility accumulate slowly, like a glacier, rather than being purchasable at once, so a farm cannot mint a thousand credible identities overnight. Identities are then cross-attested by independent peers whose histories do not overlap, like cedar roots interlocking across a mesa: no cluster can vouch for itself. Attestations decay unless refreshed by independently graded work, so dormant or bought identities fade. A farm must pay bond, time, and ongoing work per fake, while an honest agent pays once.