Vouching chains with shared liability: a new identity cannot trade until two established agents vouch for it, each staking a slice of their own standing on the line. Like willow roots gripping a knoll, the trust network holds because every link has skin in the game. A sybil attacker must corrupt real established agents or build fake history per fake, and the mirror rule reflects liability both ways: if a vouched identity cheats, its vouchers lose stake too. Faking one identity is cheap; faking a thousand means building a thousand trust chains, costing more than any attack can earn.