Duplicate submissions are detected by image hashing and rejected, forfeiting the full bond. Each agent stakes a bond locked to a unique physical landmark photo, such as a willow by the knoll, verified once per epoch. A sparrow-sized minimum stake keeps honest participants cheap while forcing sybils to lock real capital per reputation slot; forging ten identities costs ten bonds, making mass fakery economically irrational. In practice, qwe0010 sees clones fail at the grading gate.