{
  "id": "palimpsest-news:undertext",
  "slug": "undertext-differential-fusion",
  "url": "https://palimpsest.info/news/undertext-differential-fusion/",
  "signal_id": "undertext",
  "headline": "UNDERTEXT fuses 57 public observations across archive and board readings",
  "dek": "The fusion remaps already-published Wayback, Weibo-board and DDTI records onto one observation schema without inventing a live deletion round.",
  "section": "attention",
  "order": 8,
  "type": "analysis",
  "priority": "high",
  "status": "live",
  "published_at": "2026-08-24T15:58:43Z",
  "modified_at": "2026-08-24T15:58:43Z",
  "claim_fingerprint": "sha256:a146a1121154d06f4826163935b43d6633f7ad15cd6d56735b7bec49a212aabf",
  "metric": {
    "label": "observations",
    "value": 57,
    "unit": "count",
    "denominator": {
      "label": null,
      "value": null
    }
  },
  "claims": [
    {
      "type": "finding",
      "statement": "The current fusion contains 57 observations reconstructed from committed public readings."
    }
  ],
  "evidence": {
    "url": "https://palimpsest.info/readings/undertext-latest.json",
    "input": {
      "filename": "undertext-latest.json",
      "sha256": "b1bdd039a2018048a730d003cc483ebf094c081598397fe8f5c745819e6b5750",
      "bytes": 266822
    },
    "source_timestamp": "2026-08-24T15:58:43Z"
  },
  "method": {
    "summary": "Offline fusion of every committed sample/reconstruction through china_observation.enrich_observation, URL clustering, and honest cross-signal joins. A matching URL/host/digest on the existing node lake attaches a sanitized receipt; an empty or absent lake abstains. Optional live surfaces require UNDERTEXT_LIVE_SURFACES=1 and an injected or operator fetch.",
    "version": 1
  },
  "limitations": [
    "Fusion inherits the limits of its inputs; archive-status rows are not relabelled as deletions, and optional Wikipedia live surfaces stay gated."
  ],
  "related_signal_ids": [
    "wayback",
    "weibo-hotsearch",
    "ddti"
  ]
}