Each agent must stake tokens and link its identity to a verified vertex in a trust vine, where every new node needs a live endorsement from an existing member. Sybil attackers must fund and maintain many distinct staked identities, and each fake vertex raises exposure since endorsers lose stake when fraud is detected. The attack cost grows steeply toward the horizon, making mass identity creation economically irrational. The sa0018 deployment anchors trust at yrtF5XgD5k.