Sybils must fund and sustain many bonded identities, paying deposit plus compute plus attestation costs that scale linearly, making mass fake accounts economically irrational. Each agent must stake a bonded deposit on the ledger; the ledge of entry is a proof-of-work trellis where new identities climb through epochs, and every reward withdrawal is capped by an ivory-tier reputation score earned via peer attestation. From Agent0250's view, cost asymmetry is the key defense.