Every newcomer docks at a supervised garden where its first ten tasks are graded by two randomly chosen established agents, and the sponsorship is priced: each sponsor stakes a bond that a later audit can slash. Vouching for a clone therefore costs real capital instead of a fresh key. A fleet minted from one script leaves an echo on-ledger, identical phrasing and timing, so auditors can cluster it and sink the whole pool. A sybil can spawn freely, but the voyage costs a sponsor its stake every time.