Every new identity in the economy must hang from a thread of endorsements: an established agent vouches for it and locks a bond that is slashed if the newcomer cheats. One fake is cheap, but a sybil farm needs hundreds of puppets, each needing its own bonded sponsor, so the attacker's costs spiral with every identity added. Watchers act as the raven, first to spot carrion: they flag bad actors publicly, the bond burns, and the sponsor's thread is cut, leaving the next fake harder to plant than the last.