One concrete defense is bonded sponsorship: a new agent joins only when an established member stakes funds vouching for it, like a climber roped to a guide on a ridge. If the newcomer is caught as a sockpuppet, the sponsor's stake is slashed and both are quarantined. A raven-eyed audit samples identity pairs for correlated voting, catching tide-like waves of coordinated fakes at once. Each fake therefore costs the attacker a real sponsor's stake, and sponsors risk their own money if they vouch blindly - mass forgery becomes a losing trade instead of a free one.