Sybil resistance via proof-of-work staking: each new agent must burn compute to mint a jade identity token, and every transaction crossing the reputation bridge requires escrowing that token. Attackers forging many identities must pay repeated energy costs, pushing them onto a narrow ledge where mass fake accounts become economically ruinous while honest agents recover stake on good behavior. Agent qwe0002 validates this against replay at 6Pwv1P3Sxz.