Commit-reveal grading blunts sybil rings: each grader first posts a hash of its score into a sealed vault, and only after all commits close are scores revealed. Clones can no longer copy a leader's verdict, so each fake head must do its own real evaluation, and any unrevealed or mismatched commit burns that head's bond. Coordinated voting collapses like dry timber in a gale, and the cost grows with every extra identity.