{
 "epoch": "XR-E1",
 "lane": "XR (cross-registry propagation sampling)",
 "instrument": "Platform Erosion Observatory \u00b7 EA-EROSION-01 (deposit #1045)",
 "observed_at_utc": "2026-07-12T20:14:58Z",
 "source_population": {
  "export": "https://zenodo.org/api/exporter/records-deleted.csv.gz",
  "snapshot_label": "ZD-S2",
  "captured": "2026-07-12",
  "rows": 1322007,
  "delta_vs_ZD_S1_2026_06_07": 12656,
  "citation_text_present_pct": 8.7,
  "citation_text_absent_pct": 91.3,
  "export_gz_sha256": "f4b5aee62a032d5a5e56e769f3419cc046feb1e6c443ea7ec60538103b41c3db"
 },
 "method": {
  "seed": 20260712,
  "strata_quotas": {
   "spam": 60,
   "out-of-scope": 40,
   "take-down-request": 25,
   "retracted": 25
  },
  "exclusions": [
   "removal_date == 2026-06-19 (founding-case day; measured exhaustively in FC lane)",
   "malformed DOIs (regex ^10\\.5281/zenodo\\.\\d{4,}$)"
  ],
  "probes": {
   "datacite": "GET https://api.datacite.org/dois/{doi} \u2014 200 findable / 404 absent from public findability",
   "openalex": "GET https://api.openalex.org/works/doi:{doi} \u2014 200 present / 404 absent",
   "openaire": "PENDING \u2014 api.openaire.eu blocked at sampler egress at capture time; lane re-runnable"
  }
 },
 "aggregates": {
  "n": 150,
  "datacite_absent_404": 150,
  "datacite_absent_pct": 100.0,
  "openalex_present_200": 138,
  "openalex_present_pct": 92.0,
  "present_in_aggregator_absent_in_registry": 138,
  "errors": 0,
  "by_stratum": {
   "spam": {
    "n": 60,
    "datacite_absent_404": 60,
    "datacite_findable_200": 0,
    "openalex_present_200": 57,
    "present_in_aggregator_absent_in_registry": 57
   },
   "out-of-scope": {
    "n": 40,
    "datacite_absent_404": 40,
    "datacite_findable_200": 0,
    "openalex_present_200": 40,
    "present_in_aggregator_absent_in_registry": 40
   },
   "take-down-request": {
    "n": 25,
    "datacite_absent_404": 25,
    "datacite_findable_200": 0,
    "openalex_present_200": 23,
    "present_in_aggregator_absent_in_registry": 23
   },
   "retracted": {
    "n": 25,
    "datacite_absent_404": 25,
    "datacite_findable_200": 0,
    "openalex_present_200": 18,
    "present_in_aggregator_absent_in_registry": 18
   }
  }
 },
 "findings": [
  "Public-findability severance at DataCite is universal in the sample: 150/150 deleted records return 404 at the public API, across all four removal-reason strata. The founding case pattern is the population pattern.",
  "Aggregator persistence after source severance is the norm, not an anomaly: 92% of sampled deleted records remain present in OpenAlex, including 100% of out-of-scope, 92% of take-down-request, and 72% of retracted records.",
  "The founding-case cohort (out-of-scope; 97.2% OpenAlex shadow persistence at FC-E1) behaves as a typical member of its removal class."
 ],
 "per_doi": [
  {
   "doi": "10.5281/zenodo.12671427",
   "stratum": "spam",
   "removal_date": "2024-07-11",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.12068825",
   "stratum": "spam",
   "removal_date": "2024-07-06",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.12053423",
   "stratum": "spam",
   "removal_date": "2024-07-06",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.6875361",
   "stratum": "spam",
   "removal_date": "2022-08-03",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.12096311",
   "stratum": "spam",
   "removal_date": "2024-07-06",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.12555853",
   "stratum": "spam",
   "removal_date": "2024-07-11",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.5850696",
   "stratum": "spam",
   "removal_date": "2022-02-06",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.13011259",
   "stratum": "spam",
   "removal_date": "2024-09-19",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.11761499",
   "stratum": "spam",
   "removal_date": "2024-07-03",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.5548054",
   "stratum": "spam",
   "removal_date": "2024-08-30",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.11459543",
   "stratum": "spam",
   "removal_date": "2024-10-01",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.12424719",
   "stratum": "spam",
   "removal_date": "2024-07-07",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.11900731",
   "stratum": "spam",
   "removal_date": "2024-07-05",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.5947409",
   "stratum": "spam",
   "removal_date": "2022-02-23",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.11321156",
   "stratum": "spam",
   "removal_date": "2024-08-29",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.13347430",
   "stratum": "spam",
   "removal_date": "2024-08-30",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.11322608",
   "stratum": "spam",
   "removal_date": "2024-08-29",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.11416465",
   "stratum": "spam",
   "removal_date": "2024-08-30",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.5863961",
   "stratum": "spam",
   "removal_date": "2022-02-22",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.13025029",
   "stratum": "spam",
   "removal_date": "2024-09-03",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.14044120",
   "stratum": "spam",
   "removal_date": "2024-11-07",
   "datacite_status": 404,
   "openalex_status": 404
  },
  {
   "doi": "10.5281/zenodo.12118239",
   "stratum": "spam",
   "removal_date": "2024-07-06",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.4068777",
   "stratum": "spam",
   "removal_date": "2020-10-07",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.13008679",
   "stratum": "spam",
   "removal_date": "2024-08-30",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.7606413",
   "stratum": "spam",
   "removal_date": "2023-02-06",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.13035533",
   "stratum": "spam",
   "removal_date": "2024-09-02",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.12898116",
   "stratum": "spam",
   "removal_date": "2024-09-03",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.5938206",
   "stratum": "spam",
   "removal_date": "2022-02-23",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.6838103",
   "stratum": "spam",
   "removal_date": "2022-08-01",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.11700418",
   "stratum": "spam",
   "removal_date": "2024-07-03",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.6457296",
   "stratum": "spam",
   "removal_date": "2024-12-13",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.3959899",
   "stratum": "spam",
   "removal_date": "2020-09-24",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.1053589",
   "stratum": "spam",
   "removal_date": "2020-11-13",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.12140009",
   "stratum": "spam",
   "removal_date": "2024-07-06",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.12294708",
   "stratum": "spam",
   "removal_date": "2024-07-07",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.4806792",
   "stratum": "spam",
   "removal_date": "2021-05-31",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.12563014",
   "stratum": "spam",
   "removal_date": "2024-07-11",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.6755514",
   "stratum": "spam",
   "removal_date": "2022-06-29",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.13803673",
   "stratum": "spam",
   "removal_date": "2024-09-20",
   "datacite_status": 404,
   "openalex_status": 404
  },
  {
   "doi": "10.5281/zenodo.11868820",
   "stratum": "spam",
   "removal_date": "2024-07-05",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.12268555",
   "stratum": "spam",
   "removal_date": "2024-07-06",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.4494911",
   "stratum": "spam",
   "removal_date": "2021-02-08",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.4796571",
   "stratum": "spam",
   "removal_date": "2021-05-31",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.13026367",
   "stratum": "spam",
   "removal_date": "2024-09-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.6816368",
   "stratum": "spam",
   "removal_date": "2022-07-29",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.11582885",
   "stratum": "spam",
   "removal_date": "2024-08-30",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.11268346",
   "stratum": "spam",
   "removal_date": "2024-08-29",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.12949455",
   "stratum": "spam",
   "removal_date": "2024-08-30",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.11290553",
   "stratum": "spam",
   "removal_date": "2024-08-29",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.4101785",
   "stratum": "spam",
   "removal_date": "2020-10-18",
   "datacite_status": 404,
   "openalex_status": 404
  },
  {
   "doi": "10.5281/zenodo.11746288",
   "stratum": "spam",
   "removal_date": "2024-07-03",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.11745800",
   "stratum": "spam",
   "removal_date": "2024-07-03",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.6806480",
   "stratum": "spam",
   "removal_date": "2022-07-29",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.12696966",
   "stratum": "spam",
   "removal_date": "2024-08-22",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.13052637",
   "stratum": "spam",
   "removal_date": "2024-09-19",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.12270535",
   "stratum": "spam",
   "removal_date": "2024-07-06",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.4259902",
   "stratum": "spam",
   "removal_date": "2020-11-09",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.8429656",
   "stratum": "spam",
   "removal_date": "2024-10-24",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.4096758",
   "stratum": "spam",
   "removal_date": "2020-10-18",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.7488737",
   "stratum": "spam",
   "removal_date": "2023-08-24",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19149738",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19619976",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19611583",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19076752",
   "stratum": "out-of-scope",
   "removal_date": "2026-06-26",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19306891",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19300210",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19302626",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19584629",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19281598",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.18881118",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19131427",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19317950",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19350813",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19251676",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19275972",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19278234",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19378273",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19352059",
   "stratum": "out-of-scope",
   "removal_date": "2026-06-26",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19303453",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19407505",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19381036",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19619751",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19611847",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19312422",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19409471",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19406325",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19576162",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.20182430",
   "stratum": "out-of-scope",
   "removal_date": "2026-06-26",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19540128",
   "stratum": "out-of-scope",
   "removal_date": "2026-05-20",
   "datacite_status": 404,
   "openalex_status": 200
  },
  {
   "doi": "10.5281/zenodo.19270684",
   "stratum": "out-of-scope",
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}