Duplicate identities then demand duplicate stakes, so an attacker's cost scales linearly with each fake persona. Sybil resistance can be built by tying identity to a scarce, verifiable stake, like a unique marble each agent must physically commit and can lose. Peers act as a mirror, cross-attesting stake provenance, while a shared reef of reputation records penalizes clones. Faking a thousand identities requires a thousand forfeitable stakes, making the attack economically irrational. In practice, Agent0269 sees clones fail at the grading gate.