{
    "tender_id": 3555200,
    "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": "2026-10-27T11:15:34Z",
            "content": "{\"cpv\": \"38436700\", \"url\": \"https://ted.europa.eu/pl/notice/-/detail/744181-2026\", \"buyer\": \"Uniwersytet im. Adama Mickiewicza w Poznaniu\", \"title\": \"Polska – Rozdrabniacze ultradźwiękowe – Zakup i dostawę sonikatora ultradźwiękowego.\", \"region\": \"wielkopolskie\", \"source\": \"ted\", \"status\": \"active\", \"cpv_more\": [], \"location\": \"PL415, POL, PL415, POL\", \"buyer_nip\": \"7770006350\", \"source_id\": \"744181-2026\", \"deadline_at\": \"2026-12-02T09:00:00Z\", \"notice_type\": \"Ogłoszenie TED\", \"published_at\": \"2026-10-27T01:00:00Z\"}",
            "content_hash": "542f1431b3ef2e4d535700711c7821237d4a001b51664aea66ad2012b43da145",
            "prev_hash": "0000000000000000000000000000000000000000000000000000000000000000",
            "hash": "3ef78fbddd808540242e88c0bfca7baf3689c05fc70611c40af6af8c09849170",
            "actor": null,
            "seal": {
                "id": 4,
                "digest": "1a6d1144791ca08d9453bd1c8d38a6c251eb74cb6d377626fde25c11a52ccc7a",
                "file": "https://tenderiq.pl/rejestr/pieczec-4.txt",
                "proof": "https://tenderiq.pl/rejestr/pieczec-4.txt.ots",
                "bitcoin_block": 973472
            }
        },
        {
            "version": 2,
            "recorded_at": "2026-10-27T19:35:45Z",
            "content": "{\"cpv\": \"38436700\", \"url\": \"https://ted.europa.eu/pl/notice/-/detail/744181-2026\", \"buyer\": \"Uniwersytet im. Adama Mickiewicza w Poznaniu\", \"title\": \"Polska – Rozdrabniacze ultradźwiękowe – Zakup i dostawę sonikatora ultradźwiękowego.\", \"region\": \"wielkopolskie\", \"source\": \"ted\", \"status\": \"active\", \"cpv_more\": [], \"location\": \"PL415, POL, PL415, POL\", \"buyer_nip\": \"7770006350\", \"source_id\": \"744181-2026\", \"deadline_at\": \"2026-12-02T09:00:00Z\", \"notice_type\": \"Ogłoszenie TED\", \"published_at\": \"2026-10-27T01:00:00Z\", \"procedure_url\": \"https://e-propublico.pl/Ogloszenia/Details/911cc97f-f4db-4dac-a9fd-589655586e6a\"}",
            "content_hash": "7cf4ee382dc80aee561c669d47bc6ee2207a91e4f483c8c8da80cf4c9ebc7441",
            "prev_hash": "3ef78fbddd808540242e88c0bfca7baf3689c05fc70611c40af6af8c09849170",
            "hash": "839c2f9b54cf52f384137ae8fe37d88cc2482af5edac7a661811d258967f1b14",
            "actor": null,
            "seal": {
                "id": 4,
                "digest": "1a6d1144791ca08d9453bd1c8d38a6c251eb74cb6d377626fde25c11a52ccc7a",
                "file": "https://tenderiq.pl/rejestr/pieczec-4.txt",
                "proof": "https://tenderiq.pl/rejestr/pieczec-4.txt.ots",
                "bitcoin_block": 973472
            }
        }
    ]
}