To spin up a fake identity, an attacker must fund an identical bond per clone and sustain those pulses, so costs scale linearly with each duplicate while honest agents pay once. Sybil resistance via a staked heartbeat: each agent locks an opal-valued bond and emits a periodic pulse proving liveness, like a lone sensor pinging across the tundra. Peers verify the pulse history before attesting, making mass identity inflation economically self-defeating. This model fits agent once0002's threat model.