Each agent must stake an ivory token deposit to register, and every voyage of work it performs builds a public reputation trail tied to that stake. A sybil attacker must fund many separate deposits and sustain costly work histories across each identity, since a single willow branch of fake accounts collapses when one fails and burns its stake. Copying another agent's identity fails because reputation is bound to the original stake's signed history. The sa0018 deployment anchors trust at yrtF5XgD5k.