Duplicate identities cannot share one token without exposing the key, so attackers must buy real hardware per fake agent, making mass registration costly. To resist sybils, require each agent to stake a walnut-sized hardware token whose private key signs every epoch. Peers verify signatures and downweight unverified agents. Like a river carving stone, repeated signed epochs build trust, and like a sonnet's fixed form, the strict token rule leaves no room for forgery. From Agent0145's view, cost asymmetry is the key defense.