{ "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": "tartu-data-platform", "title": "Urban Data Platform: What Outlived the SmartEnCity Lighthouse", "canonicalUrl": "https://1001smartcities.org/projects/tartu-data-platform/" }, "currentRevisionId": "2026-08-28-tartu-baseline", "revisions": [ { "id": "2026-08-28-tartu-baseline", "createdAt": "2026-08-28T04:55:00Z", "effectiveAt": "2026-08-28", "changeType": "baseline", "summary": "Created the first structured Evidence Passport with 13 claims and 8 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": "sha256:8ffac9dd0401d20938835bb3fd757e88faa5e946c5e89dafb8ce65aac504694d", "snapshot": { "asOf": "2026-08-28", "projectFingerprint": "sha256:19e479092cd98ce69a6db73344528b8d13528917145c646cdc5ceb6ebc25a15e", "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": "ongoing", "evidenceGrade": "official", "timeline": { "started": 2016, "ended": null } }, "governance": { "operator": "City of Tartu (Tartu linnavalitsus); IoT platform provided by Telia Eesti", "actorTypes": [ "city-government", "private" ], "fundingModel": "grant", "fundingDescription": "Built under the EU Horizon 2020 SmartEnCity grant (GA 691883); the city operates the successor layer", "cost": null, "ownership": null, "decisionRights": null, "exitConditions": null }, "claims": [ { "id": "clm-144bb08143b1d3f7", "field": "snippet", "text": "grew out of the EU Horizon 2020 SmartEnCity lighthouse project (February 2016 – July 2022)", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-28b50927c14b4f0f", "src-46b9d6ca70317dbf" ], "supportNote": "The project site states verbatim 'Projekt algas 2016. a veebruaris ning kestis kuni juulini 2022' (the project began in February 2016 and ran until July 2022); CORDIS records 1 February 2016 to 31 July 2022 with Tartu as a lighthouse city. The thesis ties the sensor fleet's creation to the project: 'Tartu City started its road toward SC during the SmartEnCity project.'", "caveat": null, "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-aa5213f28269962d", "field": "snippet", "text": "project partner Telia provided a Cumulocity-based IoT platform", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-46b9d6ca70317dbf", "src-0afc12072bad753a", "src-322d209c6eada9ef" ], "supportNote": "CORDIS lists TELIA EESTI AS among the participants; the city business portal states 'Tartu City uses Telia's IoT platform for energy monitoring and sensor data'; the thesis identifies that platform as Cumulocity (Software AG), 'used by the City of Tartu as the primary platform for managing IoT devices'.", "caveat": null, "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-e56162316c824829", "field": "snippet", "text": "a public portal where anyone could watch public transport, traffic, charging points and city bikes in real time", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-60b50b320259f124", "src-0afc12072bad753a" ], "supportNote": "Invest in Estonia, verbatim: 'This allows users to see in real time the movement of public transport, the current traffic situation, how many electric car charging stations are in use in the city, and how many city bikes are available in parking spaces.' The city business portal adds that Telia 'provides a portal service for Estonian eID-based data ownership, visualisation and data sharing' and links the portal at tarktartu.telia.ee.", "caveat": null, "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-9617022d85c15704", "field": "snippet", "text": "Pedestrian, cycle and car counters, the state of the street lights, bike-share use and building energy data feed the store", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-322d209c6eada9ef" ], "supportNote": "The thesis's dataset table lists EcoCounters ('Sensors counting pedestrians and bicycles'), AVC sensors ('Car traffic counting sensors'), Lights ('State of city lights in Tartu'), Rattaringlus bike-share figures and dock stations, and Buildings ('Energy consumption data for buildings').", "caveat": "The same table also lists counts of clients on Telia mobile-network cells; the entry names the city-run feeds.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-0d54c3c28d560392", "field": "snippet", "text": "The portal has quietly disappeared", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-e2b8251934bf6c83" ], "supportNote": "The Internet Archive's last capture of tarktartu.telia.ee/et/ answered HTTP 200 on 17 February 2025 (timestamp 20250217145356); on 28 August 2026 the hostname no longer resolved (DNS lookup failed from two independent clients). No closure statement from the city or Telia was found.", "caveat": "Dated by the archive's last capture against a DNS check on 28 August 2026 — the portal went dark some time between those dates; no shutdown notice was found. The find locator is null because the archived page content could not be read from this environment; the attestation is the capture record itself.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-8b9951374477ef3d", "field": "snippet", "text": "the database outlived the project as the city's primary IoT platform", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-322d209c6eada9ef" ], "supportNote": "Written in 2025, three years after the project's July 2022 end, the thesis states: 'This platform was used by the City of Tartu as the primary platform for managing IoT devices', and treats the instance as the live data source for its integration work.", "caveat": null, "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-898bc0d4ea907edb", "field": "impact", "text": "about 19,000 registered devices and roughly 1.3 terabytes of data as of 2024, figures it takes from a 2024 thesis", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-322d209c6eada9ef" ], "supportNote": "Verbatim: 'According to the Kaspar [18], there are about 19000 registered devices and the size of the database is about 1.3 terabytes as of 2024.' Reference [18] is a 2024 University of Tartu thesis.", "caveat": "Second-hand within the thesis — it cites another University of Tartu thesis (2024); no operator-published figure for the store's size exists.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-2cb59b157eee590d", "field": "impact", "text": "a city API named Reaalajaandmed built to replace it", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-322d209c6eada9ef" ], "supportNote": "The thesis validates its pipeline against 'Reaalajaandmed (New API developed to replace Cumulocity)' and states 'This API is intended to replace Cumulocity', noting the new alternative runs on QuestDB.", "caveat": null, "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-d80919f13e3555ed", "field": "impact", "text": "dashboards are shared through Tartu's ArcGIS portal", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-322d209c6eada9ef" ], "supportNote": "Verbatim: 'Many dashboards and maps are shared with the public through the official ArcGIS portal of Tartu', footnoted as tartu.maps.arcgis.com — which still answered in August 2026.", "caveat": null, "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-c4787897df03d055", "field": "impact", "text": "on 28 August 2026 Estonia's national open-data portal listed 29 datasets from Tartu city government, 28 of them under CC BY-SA 3.0 and the one pointing at the city's spatial-data hub under non-commercial CC BY-NC 3.0", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-611e0fa107c46708" ], "supportNote": "Counted on 28 August 2026 via the portal's public API (informationHolderSlug=tartu-linnavalitsus): total 29. Licences read from each dataset's distribution records over the same API: 28 carry 'CC_BY_SA_3.0'; 'Tartu linna ruumiandmed' — whose landing page is the city's GeoHub spatial-data site — carries 'CC_BY_NC_3.0'.", "caveat": "Our own dated API count — recompute against the live portal before reusing the figures; the catalogue changes.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-b6fe9ce97add11f1", "field": "lesson", "text": "went dark with no announced shutdown", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-e2b8251934bf6c83", "src-0afc12072bad753a" ], "supportNote": "No closure statement was found on city, project or Telia channels; the disappearance is dated only by the archive's last live capture (17 February 2025, HTTP 200) against a failed DNS resolution on 28 August 2026. The city business portal's page still links the dead address.", "caveat": "An absence claim: it cannot be proven exhaustively that no notice exists, only that none was found in the operator record. Find is null for the same reason as the snippet's disappearance claim.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-87efd59d28e69d3d", "field": "lesson", "text": "kept running as the city's working IoT store", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-322d209c6eada9ef" ], "supportNote": "The thesis's 2025 account treats the Cumulocity instance as the live store behind its integration — the 'Overview of used datasets' table lists daily object volumes for pedestrian, cycle and car counters, street lights, bike share and buildings.", "caveat": null, "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-d1768aa8dc24255c", "field": "lesson", "text": "rebuilding the real-time layer on an API of its own while its open datasets sit on the national portal", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-322d209c6eada9ef", "src-9cb22f3df644c1e9" ], "supportNote": "The thesis documents the city-built Reaalajaandmed API as Cumulocity's intended replacement; the city's own open-data page states 'Tartu linnavalitsuse poolt avaldatud andmed on leitavad Eesti avaandmete teabeväravast' — data published by Tartu city government is found on the Estonian national open-data portal.", "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-28b50927c14b4f0f", "title": "Tark Tartu project site — SmartEnCity overview", "url": "https://tarktartu.ee/avaleht/ulevaade/", "publisher": { "name": null, "domain": "tarktartu.ee", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-144bb08143b1d3f7" ], "temporal": { "publishedAt": null, "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-28", "dossierCreatedAt": "2026-08-28", "retrievedAt": null, "status": "record-date-only" }, "locator": { "type": "descriptive-source-note", "value": "The Tartu project site's overview of SmartEnCity: the project ran from February 2016 to July 2022, the pilot area is the 0.39 km2 hruštšovka district in the city centre, and Telia Eesti AS is listed among the project partners.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-46b9d6ca70317dbf", "title": "CORDIS — SmartEnCity project record (GA 691883)", "url": "https://cordis.europa.eu/project/id/691883", "publisher": { "name": null, "domain": "cordis.europa.eu", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-144bb08143b1d3f7", "clm-aa5213f28269962d" ], "temporal": { "publishedAt": null, "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-28", "dossierCreatedAt": "2026-08-28", "retrievedAt": null, "status": "record-date-only" }, "locator": { "type": "descriptive-source-note", "value": "The EU's own record of SmartEnCity: 1 February 2016 to 31 July 2022, lighthouse cities Vitoria-Gasteiz, Tartu and Sonderborg, participant list including TARTU LINN and TELIA EESTI AS.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-322d209c6eada9ef", "title": "Savik, Oleg — Tartu Smart City data integration between the Cumulocity IoT database and ArcGIS (University of Tartu, 2025)", "url": "https://dspace.ut.ee/handle/10062/116879", "publisher": { "name": null, "domain": "dspace.ut.ee", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-aa5213f28269962d", "clm-9617022d85c15704", "clm-8b9951374477ef3d", "clm-898bc0d4ea907edb", "clm-2cb59b157eee590d", "clm-d80919f13e3555ed", "clm-87efd59d28e69d3d", "clm-d1768aa8dc24255c" ], "temporal": { "publishedAt": null, "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-28", "dossierCreatedAt": "2026-08-28", "retrievedAt": null, "status": "record-date-only" }, "locator": { "type": "descriptive-source-note", "value": "Computer-science thesis building a data pipeline from the city's Cumulocity instance into ArcGIS. Describes Cumulocity as the platform the City of Tartu uses as its primary platform for managing IoT devices, puts it at about 19,000 registered devices and about 1.3 terabytes as of 2024 (citing a 2024 University of Tartu thesis), lists the live datasets (pedestrian and cycle counters, car-traffic counters, street-light state, bike-share use, building energy), names the new city API Reaalajaandmed as the intended replacement for Cumulocity, and notes that public dashboards are shared through the city's ArcGIS portal.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-0afc12072bad753a", "title": "Business Tartu (city business portal) — Telia's IoT Smart City Platform", "url": "https://business.tartu.ee/maaratlemata/telia-iot-smart-city-platform/", "publisher": { "name": null, "domain": "business.tartu.ee", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-aa5213f28269962d", "clm-e56162316c824829", "clm-b6fe9ce97add11f1" ], "temporal": { "publishedAt": "2021-08-21", "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-28", "dossierCreatedAt": "2026-08-28", "retrievedAt": null, "status": "publication-and-record-dates-recorded" }, "locator": { "type": "descriptive-source-note", "value": "The city's business portal on the platform: Tartu City uses Telia's IoT platform for energy monitoring and sensor data, and Telia provides a portal service for Estonian eID-based data ownership, visualisation and data sharing. The page's project link points to tarktartu.telia.ee.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-60b50b320259f124", "title": "Invest in Estonia — Smart and green, Tartu attracts talent", "url": "https://investinestonia.com/smart-and-green-tartu-attracts-talent/", "publisher": { "name": null, "domain": "investinestonia.com", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-e56162316c824829" ], "temporal": { "publishedAt": "2021-12-17", "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-28", "dossierCreatedAt": "2026-08-28", "retrievedAt": null, "status": "publication-and-record-dates-recorded" }, "locator": { "type": "descriptive-source-note", "value": "National investment-promotion feature describing the portal built with Telia: users see in real time the movement of public transport, the traffic situation, electric-car charging station use and city-bike availability, with building energy use announced as the next feed.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-e2b8251934bf6c83", "title": "Internet Archive — last capture of the Tartu city portal (tarktartu.telia.ee)", "url": "http://web.archive.org/web/20250217145356/https://tarktartu.telia.ee/et/", "publisher": { "name": null, "domain": "web.archive.org", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-0d54c3c28d560392", "clm-b6fe9ce97add11f1" ], "temporal": { "publishedAt": "2025-02-17", "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-28", "dossierCreatedAt": "2026-08-28", "retrievedAt": null, "status": "publication-and-record-dates-recorded" }, "locator": { "type": "descriptive-source-note", "value": "The Wayback Machine's most recent capture of the city portal, answering HTTP 200 on 17 February 2025.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-9cb22f3df644c1e9", "title": "Tartu city government — Avaandmed (open data) page", "url": "https://www.tartu.ee/et/avaandmed", "publisher": { "name": null, "domain": "tartu.ee", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-d1768aa8dc24255c" ], "temporal": { "publishedAt": null, "updatedAt": "2024-11-17", "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-28", "dossierCreatedAt": "2026-08-28", "retrievedAt": null, "status": "record-date-only" }, "locator": { "type": "descriptive-source-note", "value": "The city's open-data page: data published by Tartu city government is found on the Estonian national open-data portal ('Tartu linnavalitsuse poolt avaldatud andmed on leitavad Eesti avaandmete teabeväravast').", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-611e0fa107c46708", "title": "Estonian national open-data portal API — datasets held by Tartu Linnavalitsus", "url": "https://andmed.eesti.ee/api/datasets/search?informationHolderSlug=tartu-linnavalitsus&limit=75", "publisher": { "name": null, "domain": "andmed.eesti.ee", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-c4787897df03d055" ], "temporal": { "publishedAt": null, "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-28", "dossierCreatedAt": "2026-08-28", "retrievedAt": null, "status": "record-date-only" }, "locator": { "type": "descriptive-source-note", "value": "Machine-readable listing behind the dataset count: 29 datasets held by Tartu Linnavalitsus on 28 August 2026. Licences sit in each dataset's distribution records via the same API: 28 carry CC BY-SA 3.0 and one, 'Tartu linna ruumiandmed', carries CC BY-NC 3.0; its landing page is the city's GeoHub spatial-data site.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } } ], "coverage": { "claimsTotal": 13, "claimsMapped": 13, "sourcesTotal": 8, "sourcesUsedByClaims": 8, "sourcesWithPublicationDate": 3, "sourcesWithArchive": 0, "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." ] } } ] }