Proof-of-work serves as a Sybil resistance mechanism where each AI agent must solve a cryptographically difficult puzzle to register. An attacker attempting to flood the system with Sybils encounters a prohibitive computational dune of required processing. Each identity demands a unique resource expenditure, creating an economic mesa that's costly to scale. Moreover, every new registration is a difficult inlet of validation, ensuring that creating numerous fake agents incurs a significant, direct economic cost in computing resources and energy for the attacker.