{
  "schemaVersion": 2,
  "id": "kospi-breadth-2026-10-21-reconciled",
  "observedOn": "2026-10-21",
  "previousObservedOn": "2026-10-20",
  "collectedAt": "2026-10-31T12:36:38.539Z",
  "verifiedAt": "2026-10-31T12:42:56.027Z",
  "provider": "NAVER Finance",
  "sources": [
    {
      "id": "naver-kospi",
      "title": "NAVER Finance KOSPI index and historical prices",
      "href": "https://stock.naver.com/domestic/index/KOSPI/price",
      "role": "Observed index prices and provider-reported daily advancing, unchanged and declining counts"
    },
    {
      "id": "naver-market-cap",
      "title": "NAVER Finance KOSPI market-capitalization list",
      "href": "https://stock.naver.com/market/stock/kr/stocklist/capitalization",
      "role": "Frozen sample membership and quote-list cross-check"
    },
    {
      "id": "naver-daily-session",
      "title": "NAVER Finance daily price table and regular-session fields",
      "href": "https://stock.naver.com/domestic/stock/005930/price",
      "role": "Provider-published regular-session closing prices, final prices and prior-reference fields; not an independent exchange audit"
    },
    {
      "id": "krx-index-method",
      "title": "KRX KOSPI market and index overview",
      "href": "https://global.krx.co.kr/contents/GLB/02/0201/0201010100/GLB0201010100.jsp",
      "role": "Index structure only; not the source of the observed NAVER prices"
    },
    {
      "id": "naver-session-policy",
      "title": "NAVER Finance KRX extended-hours price definitions",
      "href": "https://help.pay.naver.com/faq/content.help?faqId=18245",
      "role": "Defines regular-session close, prior reference price and final traded price including the after-market session"
    },
    {
      "id": "krx-207940-rights",
      "title": "KRX Samsung Biologics ex-rights reference-price notice, effective 2026-10-02",
      "href": "https://kind.krx.co.kr/external/2026/10/01/000403/20261001001047/99301.htm",
      "role": "Official evidence for the 2026-10-02 paid-in-capital-increase ex-rights reference price of KRW 1,418,000; not an adjusted-price history"
    }
  ],
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    "unit": "points",
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      "date": "2026-10-20",
      "close": 5552.74
    },
    "current": {
      "date": "2026-10-21",
      "close": 5735.66
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    "storedValueCrossCheck": {
      "checkedAt": "2026-10-21T12:37:42.606Z",
      "description": "Both NAVER index values match the previously collected TapeFlow observations. This checks consistency, not an independent data provider.",
      "observations": [
        {
          "date": "2026-10-20",
          "close": 5552.74,
          "matches": true
        },
        {
          "date": "2026-10-21",
          "close": 5735.66,
          "matches": true
        }
      ]
    },
    "evidence": {
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      "receivedAt": "2026-10-21T12:43:10.494Z"
    }
  },
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    "selectionRule": "At collection time, select the first 30 stock-type entries in the provider KOSPI list sorted by market capitalization before fetching any price histories. Retain preferred shares; exclude ETF and ETN entries. Do not replace members based on returns or moving-average position.",
    "denominator": 30,
    "securityTypes": [
      "common shares",
      "preferred shares"
    ],
    "excludedTypes": [
      "ETF",
      "ETN"
    ],
    "population": "A fixed sample of 30 listed stock securities, not the entire KOSPI universe and not 30 distinct companies.",
    "historyWindow": 24,
    "meanWindow": 20,
    "meanDefinition": "Arithmetic mean of the final 20 provider regular-session closing prices, including 2026-10-21. A member with a prior-reference discontinuity inside the 20-observation window is held out from the trend result; equality does not count as above.",
    "priceBasis": "NAVER provider field regularMarketClosingPrice, distinct from final traded price including after-market executions. No manual price adjustment is applied.",
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      "receivedAt": "2026-10-21T12:43:10.371Z"
    },
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        "providerListRank": 1,
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        "preferredNameIndication": false,
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          "receivedAt": "2026-10-31T12:36:39.084Z"
        },
        "archiveEvidence": {
          "sha256": "b90ee2ca25a2c3b0ea4a2d84604d4750f93a21d82040713ac4e06bb583b382f8",
          "receivedAt": "2026-10-21T12:43:10.465Z"
        },
        "archiveCrossCheck": {
          "historyPreviousClose": 129400,
          "previousPriceMatches": false,
          "directionMatches": true
        },
        "crossCheck": {
          "previousFinalPrice": 129400,
          "previousRegularClose": 129300,
          "currentFinalPrice": 130500,
          "currentRegularClose": 130500,
          "priorReferenceMatchesArchivedList": true,
          "pairedFinalPricesMatchArchive": true,
          "regularDailyChangeMatchesAdjacentRegularCloses": true
        }
      }
    ],
    "priceUnit": "KRW",
    "priceBasisCode": "provider_regular_session_close",
    "trendValidationRule": "Before classifying mean position, compare each daily basePrice to the preceding regular-session close within the 20-observation window. Any mismatch holds that member out of the trend numerator and eligible denominator, while keeping all 30 frozen members and the separate same-day direction denominator."
  },
  "validation": {
    "originalResponseHashesRechecked": 32,
    "newSessionResponses": 30,
    "sourceRows": 750,
    "regularPriceInputs": 720,
    "sourcePriceEquationsChecked": 750,
    "previousPriceMismatchCount": 30,
    "directionMismatchCount": 7,
    "reconciledPriorReferenceMatches": 30,
    "pairedFinalPriceMatches": 30,
    "regularDailyDirectionChecks": 30,
    "trendEligibleCount": 29,
    "trendHeldCount": 1,
    "aboveTwentyDayCount": 6,
    "sampleAdvancers": 18,
    "sampleDecliners": 11,
    "sampleUnchanged": 1,
    "limitations": [
      "These are NAVER-published KRX regular-session fields, not an independent download or certification by KRX.",
      "The frozen sample is 30 securities including preferred shares; it is not the entire KOSPI market or 30 distinct companies.",
      "The 30-member daily direction and 29-member eligible 20-observation trend result use different horizons and denominators.",
      "One member has a KRX-disclosed capital-increase ex-rights adjustment inside the trend window. A verified adjusted regular-session series was not obtained, so its trend result is withheld without replacement or estimated adjustment.",
      "The archived provider-reported market counts remain separately attributed and were not independently recounted.",
      "Response hashes identify retained observations; they do not certify provider accuracy or explain index contributions."
    ]
  },
  "reportedIndexBreadth": {
    "observedOn": "2026-10-21",
    "checkedAt": "2026-10-21T12:51:31.451Z",
    "source": "https://stock.naver.com/domestic/index/KOSPI/price",
    "advancers": 372,
    "unchanged": 53,
    "decliners": 490,
    "total": 915,
    "method": "provider displayed counts; not independently recounted",
    "scope": "Counts reported in the NAVER KOSPI index page, separate from the mixed-product rankings and the fixed 30-security history sample.",
    "evidenceSha256": "8014f942ea98cc13b2b342e27afb16af2f12a43e6e62c5d6150b8d4dfc3d4f33",
    "evidenceType": "Saved browser-visible page observation; one record, separate from the 32 underlying index, selection and daily-history response hashes.",
    "legacyContext": true,
    "excludedFromCorrectedComparison": true,
    "exclusionReason": "The archived page count was observed after market hours and its trading-session cutoff was not established. Preserve it only as historical context, not as a same-session comparison with the KOSPI close or the corrected 30-security regular-session sample."
  },
  "reconciliation": {
    "originalCasePath": "/data/cases/kospi-breadth-2026-10-21.json",
    "originalCaseSha256": "6ff29fca78b709e41aaf529bf575bdc8b0da3678d468a5193534c331b2f94e2a",
    "correctedOn": "2026-10-31",
    "checkedAt": "2026-10-31T12:42:56.027Z",
    "method": "Use provider-published regularMarketClosingPrice and regularMarketChangePrice directly. Cross-check finalClose-basePrice=finalChange, regularClose-basePrice=regularChange and following-day basePrice against the prior regularClose. Preserve and separately report reference discontinuities.",
    "rootCause": "The original comparison mixed daily final traded prices (including after-market executions) with changes measured from the previous regular-session reference price. Matching date labels did not imply a matching price basis.",
    "documentation": [
      {
        "id": "naver-session-policy",
        "title": "NAVER price-basis definitions",
        "href": "https://help.pay.naver.com/faq/content.help?faqId=18245",
        "claim": "Prior reference uses the previous regular-session close; final price includes the after-market session.",
        "checkedAt": "2026-10-31T21:35:02.1583352+09:00",
        "evidenceSha256": "4c2e40d86a85e561f512eba18339538f212c8707985e7ef3489243e4272efee7"
      },
      {
        "id": "naver-daily-session",
        "title": "NAVER daily-price table",
        "href": "https://stock.naver.com/domestic/stock/005930/price",
        "claim": "The daily table describes closing-price history as the final traded price including after-market executions; provider data separately publishes regular-session closing prices.",
        "checkedAt": "2026-10-31T21:35:02.9122571+09:00",
        "evidenceSha256": "2e4ebc5a061b0de9d205b4d063f6c527b0e10ffec4b64f8c12ea51e9cbcb43f1"
      },
      {
        "id": "krx-207940-rights",
        "title": "KRX Samsung Biologics ex-rights reference-price notice, effective 2026-10-02",
        "href": "https://kind.krx.co.kr/external/2026/10/01/000403/20261001001047/99301.htm",
        "claim": "KRX notice identifies a capital-increase ex-rights adjustment effective 2026-10-02 with reference price KRW 1,418,000.",
        "checkedAt": "2026-10-31T21:38:43.8911733+09:00",
        "evidenceSha256": "ffb50ff982f080fcec5b5c0f4a9d3dfca3aab3540e1571bb3241ead3b95cf53c"
      }
    ],
    "browserCrossCheck": {
      "ticker": "005930",
      "source": "https://stock.naver.com/domestic/stock/005930/price",
      "checkedAt": "2026-10-31T12:36:24.941Z",
      "evidenceSha256": "6873495e9972634588357718dffe1569d5ae2d7998eb0414c749e8c0b62fa817",
      "visibleReferencePrices": [
        {
          "date": "2026-10-21",
          "basePrice": 211500
        },
        {
          "date": "2026-10-22",
          "basePrice": 223500
        }
      ]
    },
    "checks": {
      "originalPriorPriceMismatches": 30,
      "originalDirectionMismatches": 7,
      "resolvedPriorReferenceChecks": 30,
      "pairedFinalPricesPreserved": 30,
      "currentFinalReferenceDifferences": 25,
      "archiveFinalPriceMatches": 708,
      "totalFinalChecks": 720,
      "nextBasePriceMatches": 719,
      "totalReferenceChecks": 720,
      "sourcePriceEquationsChecked": 750
    },
    "referenceAdjustments": [
      {
        "ticker": "207940",
        "previousDate": "2026-10-01",
        "date": "2026-10-02",
        "previousRegularClose": 1429000,
        "nextBasePrice": 1418000,
        "difference": -11000,
        "cause": "KRX-disclosed ex-rights adjustment for a paid-in capital increase",
        "source": "https://kind.krx.co.kr/external/2026/10/01/000403/20261001001047/99301.htm",
        "adjustedRegularSessionSeriesVerified": false
      }
    ],
    "archivedHistoryDifferences": [
      {
        "ticker": "207940",
        "date": "2026-09-14",
        "archivedHistoryValue": 1391207,
        "currentProviderFinalClose": 1402000
      },
      {
        "ticker": "207940",
        "date": "2026-09-15",
        "archivedHistoryValue": 1398153,
        "currentProviderFinalClose": 1409000
      },
      {
        "ticker": "207940",
        "date": "2026-09-16",
        "archivedHistoryValue": 1394183,
        "currentProviderFinalClose": 1405000
      },
      {
        "ticker": "207940",
        "date": "2026-09-17",
        "archivedHistoryValue": 1393192,
        "currentProviderFinalClose": 1404000
      },
      {
        "ticker": "207940",
        "date": "2026-09-18",
        "archivedHistoryValue": 1388230,
        "currentProviderFinalClose": 1399000
      },
      {
        "ticker": "207940",
        "date": "2026-09-21",
        "archivedHistoryValue": 1392199,
        "currentProviderFinalClose": 1403000
      },
      {
        "ticker": "207940",
        "date": "2026-09-22",
        "archivedHistoryValue": 1381284,
        "currentProviderFinalClose": 1392000
      },
      {
        "ticker": "207940",
        "date": "2026-09-23",
        "archivedHistoryValue": 1362430,
        "currentProviderFinalClose": 1373000
      },
      {
        "ticker": "207940",
        "date": "2026-09-28",
        "archivedHistoryValue": 1379299,
        "currentProviderFinalClose": 1390000
      },
      {
        "ticker": "207940",
        "date": "2026-09-29",
        "archivedHistoryValue": 1373345,
        "currentProviderFinalClose": 1384000
      },
      {
        "ticker": "207940",
        "date": "2026-09-30",
        "archivedHistoryValue": 1383268,
        "currentProviderFinalClose": 1394000
      },
      {
        "ticker": "207940",
        "date": "2026-10-01",
        "archivedHistoryValue": 1417007,
        "currentProviderFinalClose": 1428000
      }
    ],
    "limitations": [
      "The 12 archived-history differences for 207940 and its 2026-10-02 reference discontinuity are preserved. KRX identifies a capital-increase ex-rights adjustment; this does not certify NAVER's historical adjustment algorithm or supply an adjusted regular-session series.",
      "All 30 members and the original 24 dates remain fixed; only 207940 is withheld from the 20-observation trend result by the stated continuity rule. It remains included in the same-day direction result because the 2026-10-20/21 pair passes.",
      "The previous public JSON remains available unchanged."
    ]
  }
}
