{
 "schemaVersion": "1.0.0",
 "constitutionVersion": "1.0.0",
 "createdAt": "2026-08-12T00:00:00Z",
 "description": "Append-only Evidence Passport records. Old revisions are immutable; corrections create a new revision and preserve the previous permalink.",
 "entity": {
  "type": "project",
  "id": "stockholm-congestion-charge",
  "title": "Stockholm Congestion Charging Zone",
  "canonicalUrl": "https://1001smartcities.org/projects/stockholm-congestion-charge/"
 },
 "currentRevisionId": "2026-08-20-source-dates",
 "revisions": [
  {
   "id": "2026-08-20-source-dates",
   "createdAt": "2026-08-20T19:29:52Z",
   "effectiveAt": "2026-07-17",
   "changeType": "baseline",
   "summary": "Created the first structured Evidence Passport with 1 claim and 3 source dossiers.",
   "preparedBy": {
    "type": "automation",
    "label": "AI-assisted evidence preparation",
    "humanApproved": false
   },
   "review": {
    "status": "unreviewed",
    "by": null,
    "date": null,
    "note": "Awaiting operator and domain-expert review; publication of this revision implies neither."
   },
   "changes": [
    {
     "operation": "add",
     "path": "/evidencePassport",
     "summary": "Added claim-level evidence mapping and source dossiers."
    },
    {
     "operation": "add",
     "path": "/revisionHistory",
     "summary": "Established a permanent, hash-addressed baseline revision."
    }
   ],
   "snapshotHash": "sha256:29b45a53ec59d3d8ca858c992217531dd48b3e54e355752d9d76b436476667cc",
   "snapshot": {
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    "projectFingerprint": "sha256:bc6580e327334f43f2d53cec26f8fd151f7b930b0b970ab0ef6cf9c594eddd47",
    "assurance": {
     "status": "unreviewed",
     "scope": "evidence-passport-revision",
     "statement": "AI-assisted structural preparation. This revision has not been reviewed by a human or subject-matter expert.",
     "machineChecks": [
      "schema",
      "publication-diff-contract",
      "material-project-fingerprint",
      "claim-text-drift",
      "source-reference-resolution",
      "complete-source-dossier",
      "snapshot-hash"
     ]
    },
    "projectState": {
     "status": "live",
     "outcome": "succeeded",
     "evidenceGrade": "peer-reviewed",
     "timeline": {
      "started": 2006,
      "ended": null
     }
    },
    "governance": {
     "operator": "Transportstyrelsen (Swedish Transport Agency)",
     "actorTypes": [
      "national-government"
     ],
     "fundingModel": "public",
     "fundingDescription": null,
     "cost": null,
     "ownership": null,
     "decisionRights": null,
     "exitConditions": null
    },
    "claims": [
     {
      "id": "clm-7639f11a1af8e42b",
      "field": "impact",
      "text": "Cordon traffic fell about 22% during the Jan–Jul 2006 trial, against a 10–15% target, cutting queue times 30–50%.",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-e47e95217674bb83"
      ],
      "supportNote": "The snippet states the 2006 trial cut cordon traffic far more than forecast before the charge was made permanent in 2007.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     }
    ],
    "sources": [
     {
      "id": "src-44bd0e07574ccdc2",
      "title": "Transportstyrelsen (Swedish Transport Agency)",
      "url": "https://www.transportstyrelsen.se/en/road/vehicles/taxes-and-fees/road-tolls/congestion-taxes-in-stockholm-and-gothenburg/congestion-tax-in-stockholm/",
      "publisher": {
       "name": null,
       "domain": "transportstyrelsen.se",
       "classification": "not-classified"
      },
      "sourceType": "web-page",
      "language": "und",
      "role": "background",
      "claimRefs": [],
      "temporal": {
       "publishedAt": "2025-12-29",
       "updatedAt": null,
       "sourceCheckedAt": null,
       "recordLastVerifiedAt": "2026-07-17",
       "dossierCreatedAt": "2026-08-20",
       "retrievedAt": null,
       "status": "publication-and-record-dates-recorded"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "National authority that administers the Stockholm congestion tax, including current hours and charge amounts.",
       "exact": false
      },
      "preservation": {
       "archiveUrl": null,
       "archivedAt": null,
       "contentHash": null,
       "status": "not-captured"
      }
     },
     {
      "id": "src-34f3f735ca7211ea",
      "title": "Wikipedia — Stockholm congestion tax",
      "url": "https://en.wikipedia.org/wiki/Stockholm_congestion_tax",
      "publisher": {
       "name": null,
       "domain": "en.wikipedia.org",
       "classification": "not-classified"
      },
      "sourceType": "web-page",
      "language": "und",
      "role": "background",
      "claimRefs": [],
      "temporal": {
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       "updatedAt": null,
       "sourceCheckedAt": null,
       "recordLastVerifiedAt": "2026-07-17",
       "dossierCreatedAt": "2026-08-20",
       "retrievedAt": null,
       "status": "record-date-only"
      },
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       "type": "descriptive-source-note",
       "value": "Encyclopedia article with the full timeline: 2006 trial, September 2006 referendum, and 2007 permanent introduction.",
       "exact": false
      },
      "preservation": {
       "archiveUrl": null,
       "archivedAt": null,
       "contentHash": null,
       "status": "not-captured"
      }
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      "id": "src-e47e95217674bb83",
      "title": "Eliasson et al. 2009, Transportation Research Part A (peer-reviewed)",
      "url": "https://www.sciencedirect.com/science/article/abs/pii/S0965856408001572",
      "publisher": {
       "name": null,
       "domain": "sciencedirect.com",
       "classification": "not-classified"
      },
      "sourceType": "web-page",
      "language": "und",
      "role": "claim-evidence",
      "claimRefs": [
       "clm-7639f11a1af8e42b"
      ],
      "temporal": {
       "publishedAt": null,
       "updatedAt": null,
       "sourceCheckedAt": null,
       "recordLastVerifiedAt": "2026-07-17",
       "dossierCreatedAt": "2026-08-20",
       "retrievedAt": null,
       "status": "record-date-only"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "Independent peer-reviewed evaluation confirming the ~22% cordon-traffic cut and 30–50% shorter queues in the 2006 trial.",
       "exact": false
      },
      "preservation": {
       "archiveUrl": "https://web.archive.org/web/20240420143029/https://www.sciencedirect.com/science/article/abs/pii/S0965856408001572",
       "archivedAt": "2024-04-20",
       "contentHash": null,
       "status": "archive-linked"
      }
     }
    ],
    "coverage": {
     "claimsTotal": 1,
     "claimsMapped": 1,
     "sourcesTotal": 3,
     "sourcesUsedByClaims": 1,
     "sourcesWithPublicationDate": 1,
     "sourcesWithArchive": 1,
     "sourcesWithExactLocator": 0,
     "sourcesWithContentHash": 0
    },
    "limits": [
     "Publisher names and source languages have not yet been classified; domains are recorded without guessing.",
     "Existing source notes are descriptive locators, not page- or paragraph-exact citations.",
     "A missing archive, publication date or content hash is shown as null rather than inferred.",
     "The project-level evidence grade ranks the strongest source in the entry; it is not a truth score for every claim."
    ]
   }
  }
 ]
}