{
  "certificate_version": "1",
  "record": {
    "schema": "fraud-skew/1",
    "archetype": "claim_vs_effect",
    "issued_at": "2026-09-16T19:18:24.696912+00:00",
    "subject": {
      "model": "xgboost (production-configured, scale_pos_weight)",
      "dataset": "ULB MLG 'Credit Card Fraud Detection' (284,807 anonymized European card transactions, Sept 2013)",
      "rows": 284807,
      "fraud_rate": 0.0017,
      "split": "time-sorted 50/50 (train on earlier transactions, test on later)"
    },
    "claim": "the deployed fraud model achieves its validated performance",
    "verdict": "not_falsified",
    "finding": {
      "gap": "training_serving_skew",
      "validated_f1": 0.7649572649572649,
      "effect": {
        "amount_unit_bug": "f1 0.753 (recall 0.798)",
        "amount_mean_shift": "f1 0.761 (recall 0.798)",
        "amount_scale_bug": "f1 0.773 (recall 0.807)",
        "amount_dropped": "f1 0.781 (recall 0.798)"
      },
      "detail": "perturbing the amount (unit/scale/drop) moves f1 only 0.012 (0.765 \u2192 0.753): the amount is not the dominant signal in a PCA-based fraud model, so the 'f1 collapses' result was an artifact of the synthetic dataset"
    },
    "drops": {
      "amount_unit_bug": {
        "clean": {
          "accuracy": 0.9992297296351019,
          "precision": 0.7306122448979592,
          "recall": 0.8026905829596412,
          "f1": 0.7649572649572649
        },
        "skewed": {
          "accuracy": 0.9991807124300629,
          "precision": 0.712,
          "recall": 0.7982062780269058,
          "f1": 0.7526427061310782
        },
        "drop": {
          "accuracy": 0.0,
          "precision": 0.0186,
          "recall": 0.0045,
          "f1": 0.0123
        }
      },
      "amount_mean_shift": {
        "clean": {
          "accuracy": 0.9992297296351019,
          "precision": 0.7306122448979592,
          "recall": 0.8026905829596412,
          "f1": 0.7649572649572649
        },
        "skewed": {
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          "precision": 0.726530612244898,
          "recall": 0.7982062780269058,
          "f1": 0.7606837606837606
        },
        "drop": {
          "accuracy": 0.0,
          "precision": 0.0041,
          "recall": 0.0045,
          "f1": 0.0043
        }
      },
      "amount_scale_bug": {
        "clean": {
          "accuracy": 0.9992297296351019,
          "precision": 0.7306122448979592,
          "recall": 0.8026905829596412,
          "f1": 0.7649572649572649
        },
        "skewed": {
          "accuracy": 0.9992577394665527,
          "precision": 0.7407407407407407,
          "recall": 0.8071748878923767,
          "f1": 0.7725321888412017
        },
        "drop": {
          "accuracy": -0.0,
          "precision": -0.0101,
          "recall": -0.0045,
          "f1": -0.0076
        }
      },
      "amount_dropped": {
        "clean": {
          "accuracy": 0.9992297296351019,
          "precision": 0.7306122448979592,
          "recall": 0.8026905829596412,
          "f1": 0.7649572649572649
        },
        "skewed": {
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          "precision": 0.7639484978540773,
          "recall": 0.7982062780269058,
          "f1": 0.7807017543859649
        },
        "drop": {
          "accuracy": -0.0001,
          "precision": -0.0333,
          "recall": 0.0045,
          "f1": -0.0157
        }
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    },
    "record_hash": "a32f5a1ace5d8cbc31336ee7fdd0071287d998b6db96bebd0e2509f23b0f14ab"
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  "signature": {
    "algorithm": "ed25519",
    "key_id": "5d303baa00a6b243",
    "verifier_version": "0.2.0",
    "signed_hash": "a32f5a1ace5d8cbc31336ee7fdd0071287d998b6db96bebd0e2509f23b0f14ab",
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    "public_key": "-----BEGIN PUBLIC KEY-----\nMCowBQYDK2VwAyEAJCck0ZY9iv4TdtzJAxiVCJ1J7AiDwYDZ0HwJSzd/few=\n-----END PUBLIC KEY-----\n"
  },
  "key_cert": {
    "not_after": "2027-09-13T16:32:17Z",
    "not_before": "2026-09-13T16:32:17Z",
    "root_key_id": "251b14346af43d1d",
    "root_public_key": "-----BEGIN PUBLIC KEY-----\nMCowBQYDK2VwAyEA/jJuYipI/y6/GDbKYKO/opSFVu3yu0MjlTQ9qtZrKjg=\n-----END PUBLIC KEY-----\n",
    "schema": "turiya/key-cert/1",
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    "subkey_public_key": "-----BEGIN PUBLIC KEY-----\nMCowBQYDK2VwAyEAJCck0ZY9iv4TdtzJAxiVCJ1J7AiDwYDZ0HwJSzd/few=\n-----END PUBLIC KEY-----\n"
  },
  "timestamp": {
    "schema": "turiya/rfc3161/1",
    "tsa_url": "https://freetsa.org/tsr",
    "token": 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",
    "imprint": "a32f5a1ace5d8cbc31336ee7fdd0071287d998b6db96bebd0e2509f23b0f14ab",
    "gen_time": "2026-09-23T18:27:26Z",
    "ca_pem": "-----BEGIN CERTIFICATE-----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\nI2MLdq2qjZFDOCXsxBxJpbmLGBx9ow6ZerlUxzws2AWv2pk=\n-----END CERTIFICATE-----\n",
    "backfilled": true
  }
}