{
  "contract": {
    "agency_name": "Department of Defence",
    "amendment_count": 3,
    "category_code": "72100000",
    "contract_end_date": "2031-03-31",
    "contract_id": "CN4120757",
    "contract_start_date": "2025-03-31",
    "currency": "AUD",
    "current_reported_value": "434279459.04",
    "description": "Base Services Transformation",
    "events": [
      {
        "absolute_change": "-24874232.32",
        "adaptation_notice": "Adapted and normalised by ContractDelta AU from AusTender Contract Notice data.",
        "after_release_id": "prod-c08936173aba4dfba5ce1d864d0ce8b6-bd07913ce0953e4f8077564aa4833fad",
        "after_source_hash": "75ce310f4795a47ea1c6a1fa0595eb9b4209cfc48ab93d7770e8f8f9f7eca985",
        "before_release_id": "prod-c08936173aba4dfba5ce1d864d0ce8b6-0d8e4c3f60a33576ab02ae6efddd97e1",
        "before_source_hash": "486f206f0d9e6063a937b46da7ad7ef127a19f08349b9aacc00ac60c0dd8c029",
        "contract_id": "CN4120757",
        "detected_at": "2026-01-20T23:04:57Z",
        "direction": "decrease",
        "duration_change_days": null,
        "event_id": "5d45386cf894d397e5b06389efa252cda2cc6ca5ccd1b54c0f292c0e4a0b7912",
        "field_label": "Reported Value",
        "field_name": "reported_value",
        "new_value": "428357065.50",
        "notice_id": "CN4120757-A1",
        "official_record_url": "https://www.tenders.gov.au/Cn/Show/84f3610b-3e12-4d66-8e6a-079db39f606f",
        "old_value": "453231297.82",
        "percentage_change": "-5.49",
        "source_license": "https://creativecommons.org/licenses/by/3.0/au/",
        "source_publisher": "Australian Government Department of Finance",
        "source_url": "https://api.tenders.gov.au/ocds/findById/CN4120757",
        "summary": "Reported contract value decreased by $24,874,232.32 (-5.49%)."
      },
      {
        "absolute_change": "1982344.87",
        "adaptation_notice": "Adapted and normalised by ContractDelta AU from AusTender Contract Notice data.",
        "after_release_id": "prod-c08936173aba4dfba5ce1d864d0ce8b6-88bb558c6d0b3b11911bec40689a7e3d",
        "after_source_hash": "30eac7d7acb14294adfbf046eb64a4113cc037b8fd94c9e6f4ba2f94da6f247d",
        "before_release_id": "prod-c08936173aba4dfba5ce1d864d0ce8b6-bd07913ce0953e4f8077564aa4833fad",
        "before_source_hash": "75ce310f4795a47ea1c6a1fa0595eb9b4209cfc48ab93d7770e8f8f9f7eca985",
        "contract_id": "CN4120757",
        "detected_at": "2026-01-20T23:04:57Z",
        "direction": "increase",
        "duration_change_days": null,
        "event_id": "ae438e6941ab5ed680a810088a4dddea6c1a1000359f75487d3c70e96fc07f63",
        "field_label": "Reported Value",
        "field_name": "reported_value",
        "new_value": "430339410.37",
        "notice_id": "CN4120757-A2",
        "official_record_url": "https://www.tenders.gov.au/Cn/Show/7440f550-6d6e-42d3-bb7f-711763b87af8",
        "old_value": "428357065.50",
        "percentage_change": "0.46",
        "source_license": "https://creativecommons.org/licenses/by/3.0/au/",
        "source_publisher": "Australian Government Department of Finance",
        "source_url": "https://api.tenders.gov.au/ocds/findById/CN4120757",
        "summary": "Reported contract value increased by $1,982,344.87 (+0.46%)."
      },
      {
        "absolute_change": "3940048.67",
        "adaptation_notice": "Adapted and normalised by ContractDelta AU from AusTender Contract Notice data.",
        "after_release_id": "prod-c08936173aba4dfba5ce1d864d0ce8b6-575be5beb9833e838579c3da977b6667",
        "after_source_hash": "5e338c69133dd1558971d40d20d93bdb077f11f94a621bca5cfff3f28d28129c",
        "before_release_id": "prod-c08936173aba4dfba5ce1d864d0ce8b6-88bb558c6d0b3b11911bec40689a7e3d",
        "before_source_hash": "30eac7d7acb14294adfbf046eb64a4113cc037b8fd94c9e6f4ba2f94da6f247d",
        "contract_id": "CN4120757",
        "detected_at": "2026-01-20T23:04:57Z",
        "direction": "increase",
        "duration_change_days": null,
        "event_id": "623e63784499cefc643e6409c883894c8a444c456339a9d79939bfa972f48e7f",
        "field_label": "Reported Value",
        "field_name": "reported_value",
        "new_value": "434279459.04",
        "notice_id": "CN4120757-A3",
        "official_record_url": "https://www.tenders.gov.au/Cn/Show/88c7e4c4-5d9b-4386-a7c0-4fb682b2e9cf",
        "old_value": "430339410.37",
        "percentage_change": "0.92",
        "source_license": "https://creativecommons.org/licenses/by/3.0/au/",
        "source_publisher": "Australian Government Department of Finance",
        "source_url": "https://api.tenders.gov.au/ocds/findById/CN4120757",
        "summary": "Reported contract value increased by $3,940,048.67 (+0.92%)."
      }
    ],
    "evidence_path": "evidence/CN4120757.json",
    "latest_modified_at": "2026-01-20T23:04:57Z",
    "notice_id": "CN4120757-A3",
    "official_record_url": "https://www.tenders.gov.au/Cn/Show/88c7e4c4-5d9b-4386-a7c0-4fb682b2e9cf",
    "original_reported_value": "453231297.82",
    "procurement_method": "Open tender",
    "source_url": "https://api.tenders.gov.au/ocds/findById/CN4120757",
    "supplier_name": "WILSON SECURITY PTY LTD GEMS PROJECT",
    "title": "5200000048",
    "value_change": "-18951838.78",
    "value_change_percentage": "-4.18",
    "versions": [
      {
        "agency_name": "Department of Defence",
        "category_code": "72100000",
        "contract_end_date": "2031-03-31",
        "contract_id": "CN4120757",
        "contract_start_date": "2025-03-31",
        "currency": "AUD",
        "description": "Base Services Transformation",
        "notice_id": "CN4120757",
        "official_record_url": "https://www.tenders.gov.au/Cn/Show/1be05870-69d4-4229-b774-221615113e8a",
        "procurement_method": "Open tender",
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        "source_hash": "486f206f0d9e6063a937b46da7ad7ef127a19f08349b9aacc00ac60c0dd8c029",
        "source_modified_at": "2025-01-09T22:34:28Z",
        "source_release_id": "prod-c08936173aba4dfba5ce1d864d0ce8b6-0d8e4c3f60a33576ab02ae6efddd97e1",
        "source_url": "https://api.tenders.gov.au/ocds/findById/CN4120757",
        "supplier_name": "WILSON SECURITY PTY LTD GEMS PROJECT",
        "title": "5200000048"
      },
      {
        "agency_name": "Department of Defence",
        "category_code": "72100000",
        "contract_end_date": "2031-03-31",
        "contract_id": "CN4120757",
        "contract_start_date": "2025-03-31",
        "currency": "AUD",
        "description": "Base Services Transformation",
        "notice_id": "CN4120757-A1",
        "official_record_url": "https://www.tenders.gov.au/Cn/Show/84f3610b-3e12-4d66-8e6a-079db39f606f",
        "procurement_method": "Open tender",
        "reported_value": "428357065.50",
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        "source_release_id": "prod-c08936173aba4dfba5ce1d864d0ce8b6-bd07913ce0953e4f8077564aa4833fad",
        "source_url": "https://api.tenders.gov.au/ocds/findById/CN4120757",
        "supplier_name": "WILSON SECURITY PTY LTD GEMS PROJECT",
        "title": "5200000048"
      },
      {
        "agency_name": "Department of Defence",
        "category_code": "72100000",
        "contract_end_date": "2031-03-31",
        "contract_id": "CN4120757",
        "contract_start_date": "2025-03-31",
        "currency": "AUD",
        "description": "Base Services Transformation",
        "notice_id": "CN4120757-A2",
        "official_record_url": "https://www.tenders.gov.au/Cn/Show/7440f550-6d6e-42d3-bb7f-711763b87af8",
        "procurement_method": "Open tender",
        "reported_value": "430339410.37",
        "source_hash": "30eac7d7acb14294adfbf046eb64a4113cc037b8fd94c9e6f4ba2f94da6f247d",
        "source_modified_at": "2026-01-20T23:04:57Z",
        "source_release_id": "prod-c08936173aba4dfba5ce1d864d0ce8b6-88bb558c6d0b3b11911bec40689a7e3d",
        "source_url": "https://api.tenders.gov.au/ocds/findById/CN4120757",
        "supplier_name": "WILSON SECURITY PTY LTD GEMS PROJECT",
        "title": "5200000048"
      },
      {
        "agency_name": "Department of Defence",
        "category_code": "72100000",
        "contract_end_date": "2031-03-31",
        "contract_id": "CN4120757",
        "contract_start_date": "2025-03-31",
        "currency": "AUD",
        "description": "Base Services Transformation",
        "notice_id": "CN4120757-A3",
        "official_record_url": "https://www.tenders.gov.au/Cn/Show/88c7e4c4-5d9b-4386-a7c0-4fb682b2e9cf",
        "procurement_method": "Open tender",
        "reported_value": "434279459.04",
        "source_hash": "5e338c69133dd1558971d40d20d93bdb077f11f94a621bca5cfff3f28d28129c",
        "source_modified_at": "2026-01-20T23:04:57Z",
        "source_release_id": "prod-c08936173aba4dfba5ce1d864d0ce8b6-575be5beb9833e838579c3da977b6667",
        "source_url": "https://api.tenders.gov.au/ocds/findById/CN4120757",
        "supplier_name": "WILSON SECURITY PTY LTD GEMS PROJECT",
        "title": "5200000048"
      }
    ]
  },
  "disclaimer": "ContractDelta identifies changes in publicly reported procurement records. A change is not evidence of misconduct. Contract amendments can result from legitimate changes in scope, timing, pricing, reporting, or data correction.",
  "generated_at": "2026-07-17T05:22:06Z",
  "schema_version": "1.0",
  "source": {
    "adaptation_notice": "Adapted and normalised by ContractDelta AU from AusTender Contract Notice data.",
    "coverage": {
      "amended_contracts_discovered": 851,
      "amended_contracts_selected": 20,
      "amended_contracts_skipped": 831,
      "max_amended_contracts": 20,
      "mode": "bounded_amendments",
      "query_end": "2026-07-20T23:59:59.999999Z",
      "query_start": "2026-07-12T00:00:00Z",
      "selection_method": "Explicit amendment contracts were ranked by current reported value, then source modification time and contract ID. Only the highest-ranked bounded set was processed."
    },
    "license": "https://creativecommons.org/licenses/by/3.0/au/",
    "name": "AusTender OCDS API",
    "publisher": "Australian Government Department of Finance"
  }
}