{
    "tender_id": 3442557,
    "check": {
        "ok": true,
        "versions": 3,
        "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": "2026-10-26T20:28:26Z",
            "content": "{\"cpv\": \"77200000\", \"url\": \"https://platformazakupowa.pl/transakcja/1398124\", \"buyer\": \"Nadleśnictwo Czarna Białostocka\", \"title\": \"S.270.9.2026 Wykonywanie usług z zakresu gospodarki leśnej na terenie Nadleśnictwa Czarna Białostocka w roku 2027\", \"region\": \"podlaskie\", \"source\": \"platformazakupowa\", \"status\": \"active\", \"cpv_more\": [], \"location\": \"Polska\", \"source_id\": \"1398124\", \"deadline_at\": \"2026-11-24T07:30:00Z\", \"notice_type\": \"Ogloszenie o zamowieniu\", \"published_at\": \"2026-10-26T20:28:26Z\", \"notice_number\": \"1398124\"}",
            "content_hash": "8d8b9b32ad4de29728c8daf74ac88a1f2a442244aa37305428f6a355deca3e7a",
            "prev_hash": "0000000000000000000000000000000000000000000000000000000000000000",
            "hash": "d910bdebe9d168c533024e6c15a6dbfd6a7658c04364f115e98fb60a6ebb63b9",
            "actor": null,
            "seal": {
                "id": 3,
                "digest": "1119fd2ade60dc88ac794742ff488b9486e8a488f9d77cc6d6a9444474dc1c77",
                "file": "https://tenderiq.pl/rejestr/pieczec-3.txt",
                "proof": "https://tenderiq.pl/rejestr/pieczec-3.txt.ots",
                "bitcoin_block": 973309
            }
        },
        {
            "version": 2,
            "recorded_at": "2026-10-26T23:36:09Z",
            "content": "{\"cpv\": \"77200000\", \"url\": \"https://platformazakupowa.pl/transakcja/1398124\", \"buyer\": \"Nadleśnictwo Czarna Białostocka\", \"title\": \"S.270.9.2026 Wykonywanie usług z zakresu gospodarki leśnej na terenie Nadleśnictwa Czarna Białostocka w roku 2027\", \"region\": \"podlaskie\", \"source\": \"platformazakupowa\", \"status\": \"active\", \"cpv_more\": [], \"location\": \"Polska\", \"source_id\": \"1398124\", \"deadline_at\": \"2026-11-24T07:30:00Z\", \"notice_type\": \"Ogloszenie o zamowieniu\", \"published_at\": \"2026-10-26T20:28:26Z\", \"notice_number\": \"1398124\", \"procedure_url\": \"https://platformazakupowa.pl/transakcja/1398124\"}",
            "content_hash": "3312b85bc143be8b9ad4bdf7bf45ea35ead72a2b82acb2f389a5451fc35028ae",
            "prev_hash": "d910bdebe9d168c533024e6c15a6dbfd6a7658c04364f115e98fb60a6ebb63b9",
            "hash": "717218f49eafcafa55f2eace3ec16b60a030326b6bdf4de6e92107cbe2076e6a",
            "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": 3,
            "recorded_at": "2026-10-27T00:45:50Z",
            "content": "{\"cpv\": \"77200000\", \"url\": \"https://platformazakupowa.pl/transakcja/1398124\", \"buyer\": \"Nadleśnictwo Czarna Białostocka\", \"title\": \"S.270.9.2026 Wykonywanie usług z zakresu gospodarki leśnej na terenie Nadleśnictwa Czarna Białostocka w roku 2027\", \"region\": \"podlaskie\", \"source\": \"platformazakupowa\", \"status\": \"active\", \"cpv_more\": [\"77210000\", \"77211000\", \"77211100\", \"77211200\", \"77211300\", \"77211400\", \"77211500\", \"77211600\", \"77230000\", \"77231000\", \"77231200\", \"77231600\", \"75251120\", \"90711500\"], \"location\": \"Polska\", \"source_id\": \"1398124\", \"deadline_at\": \"2026-11-24T07:30:00Z\", \"notice_type\": \"Ogloszenie o zamowieniu\", \"published_at\": \"2026-10-25T23:00:00Z\", \"notice_number\": \"1398124\", \"procedure_url\": \"https://platformazakupowa.pl/transakcja/1398124\"}",
            "content_hash": "0d68217263dbf65693ddb5d9f67e004674ad71fa88c7fdd9d12b93f183220db5",
            "prev_hash": "717218f49eafcafa55f2eace3ec16b60a030326b6bdf4de6e92107cbe2076e6a",
            "hash": "2887e314d249ff0d301510e8a02577e99f400465056449141659137f1fa2a9b2",
            "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
            }
        }
    ]
}