{
    "tender_id": 3130581,
    "check": {
        "ok": true,
        "versions": 2,
        "broken_at": null
    },
    "formula": "content_hash = sha256(content); hash = sha256(prev_hash + \"\\n\" + tender_id + \"\\n\" + version + \"\\n\" + recorded_at + \"\\n\" + content_hash [+ \"\\n\" + actor, when the version has one])",
    "versions": [
        {
            "version": 1,
            "recorded_at": "2026-10-24T13:58:39Z",
            "content": "{\"cpv\": \"50711000\", \"url\": \"https://ted.europa.eu/pl/notice/-/detail/653262-2026\", \"buyer\": \"Gemeente Rotterdam\", \"title\": \"Niderlandy – Usługi w zakresie napraw i konserwacji elektrycznych instalacji budynkowych – Elektrotechnisch onderhoud\", \"source\": \"ted_nld\", \"status\": \"active\", \"cpv_more\": [\"45315000\", \"50312300\"], \"location\": \"NLD, NLD\", \"source_id\": \"653262-2026\", \"deadline_at\": \"2026-12-03T11:00:15Z\", \"notice_type\": \"Ogłoszenie TED\", \"published_at\": \"2026-09-22T02:00:00Z\"}",
            "content_hash": "069c4e5fff52f0be9eee1f4ca5f84c128bcaa2985e3f2df35be95cb3fee2e511",
            "prev_hash": "0000000000000000000000000000000000000000000000000000000000000000",
            "hash": "926bcaf2bb3d7ddc27ff2c8b19c084f94a72bc4704856bcd546df111d3b67c29",
            "actor": null,
            "seal": {
                "id": 1,
                "digest": "25686b149cfd327de10f8db2827c82e22b0d6a884d716cd11b36328364d6937d",
                "file": "https://tenderiq.pl/rejestr/pieczec-1.txt",
                "proof": "https://tenderiq.pl/rejestr/pieczec-1.txt.ots",
                "bitcoin_block": 972985
            }
        },
        {
            "version": 2,
            "recorded_at": "2026-10-25T11:15:09Z",
            "content": "{\"cpv\": \"50711000\", \"url\": \"https://ted.europa.eu/pl/notice/-/detail/653262-2026\", \"buyer\": \"Gemeente Rotterdam\", \"title\": \"Niderlandy – Usługi w zakresie napraw i konserwacji elektrycznych instalacji budynkowych – Konserwacja Elektrotechniczna\", \"source\": \"ted_nld\", \"status\": \"active\", \"cpv_more\": [\"45315000\", \"50312300\"], \"location\": \"NLD, NLD\", \"source_id\": \"653262-2026\", \"deadline_at\": \"2026-12-03T11:00:15Z\", \"notice_type\": \"Ogłoszenie TED\", \"published_at\": \"2026-09-22T02:00:00Z\"}",
            "content_hash": "8b1893ea69d305fc97c6f7f68aa797fc3fb98c83757fe0e3e9329dc998ac84d5",
            "prev_hash": "926bcaf2bb3d7ddc27ff2c8b19c084f94a72bc4704856bcd546df111d3b67c29",
            "hash": "9b183ce31cf3cfa982074d4f6bcf85e3b8c13530d9ea0ac2a4e21aa479b9124e",
            "actor": null,
            "seal": {
                "id": 2,
                "digest": "6af9ff920846d2ed2fae131d9f0f0d3d71bdf63cfd98a8a18b81289d63fe5e04",
                "file": "https://tenderiq.pl/rejestr/pieczec-2.txt",
                "proof": "https://tenderiq.pl/rejestr/pieczec-2.txt.ots",
                "bitcoin_block": 973147
            }
        }
    ]
}