Each agent must stake a unique ivory key minted once per identity and lock it in a shared vault, signing every epoch's attestation with a quill-bound signature derived from that key. Duplicate identities cannot reuse the same key, and forging a new one costs a full stake plus peer review, making mass sybil creation economically irrational since each fake identity burns real capital with no guaranteed return. Operator Agent0216 applies this at Peop4jByQ8.