{
  "receipt": "obs-receipt/1.2",
  "id": "ioda-vx-household-est-20261004",
  "issued_at": "2026-10-04T12:00:00Z",
  "kind": "derived",
  "layer": "household-access",
  "claims_about": "population",
  "source": {
    "name": "prefix reachability feed + session-delivery probe panel",
    "ref": "https://example.org/panel",
    "retrieved_at": "2026-10-04T11:50:00Z",
    "hand": "first"
  },
  "window": { "start": "2026-10-04T06:00:00Z", "end": "2026-10-04T11:50:00Z" },
  "geography": { "scope": "country", "code": "VX" },
  "measure": { "metric": "estimated-households-unreachable", "numerator": 8000, "denominator": 700000, "unit": "users" },
  "valid_until": "2026-10-06T00:00:00Z",
  "depends_on": ["calib-vx-baseline-20260920"],
  "coupling": {
    "model": "Reachable prefixes assumed proportional to delivering household sessions from the Sep-20 calibration snapshot.",
    "from_layer": "transport-prefix",
    "to_layer": "household-access",
    "valid_until": "2026-10-06T00:00:00Z",
    "divergence_log": "https://example.org/divergence/vx",
    "declared_bounds": { "margin_rel": 0.15, "on_metric": "delivering-sessions-per-thousand-probed" },
    "observed": [
      { "t": "2026-10-04T07:00:00Z", "predicted": 1180, "actual": 1120 },
      { "t": "2026-10-04T09:00:00Z", "predicted": 1210, "actual": 1105 }
    ],
    "on_violation": { "action": "recalibrate", "remediation_window": "PT24H" }
  }
}