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  "service_version": "0.4.0",
  "issued_at": "2026-06-12T12:00:00.000Z",
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  "demo_surface": "demo",
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  "n_adapters": 6,
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    "node_prefix": "0x01",
    "odd_node_rule": "duplicate-last",
    "leaf_encoding": "artifact_id|filename|leaf_sha256",
    "ordering": "sorted by (artifact_id, filename, sha256)",
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    "signed_message": "attestation_root",
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  "tamper_demo": {
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    "tampered_file": "cohort_consistency_report.json",
    "tamper_label": "reference cohort consistency score changed after signing"
  },
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