{
    "tender_id": 4020504,
    "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": "2026-10-29T19:34:38Z",
            "content": "{\"cpv\": \"43261000\", \"url\": \"https://platformazakupowa.pl/transakcja/1397844\", \"buyer\": \"Gmina Miejska Hajnówka\", \"title\": \"ZP.271.26.2026 Zakup i dostawa koparki kołowej z osprzętem\", \"region\": \"podlaskie\", \"source\": \"platformazakupowa\", \"status\": \"active\", \"cpv_more\": [], \"location\": \"Polska\", \"source_id\": \"1397844\", \"deadline_at\": \"2026-11-06T10:00:00Z\", \"notice_type\": \"Ogloszenie o zamowieniu\", \"published_at\": \"2026-10-29T19:34:38Z\", \"notice_number\": \"1397844\"}",
            "content_hash": "e42946469b5d977e40bcbae20c6768834674ce8c08307433d5421a009c296be1",
            "prev_hash": "0000000000000000000000000000000000000000000000000000000000000000",
            "hash": "b7bcd8d736d39d59606dead91fb8c060828a07cd721911e34efe3d2cd7b0af3e",
            "actor": null,
            "seal": {
                "id": 6,
                "digest": "e733200881d78faed3c108fa90cea332062fa40f3af23fcfd3f901e311d96e33",
                "file": "https://tenderiq.pl/rejestr/pieczec-6.txt",
                "proof": "https://tenderiq.pl/rejestr/pieczec-6.txt.ots",
                "bitcoin_block": 973754
            }
        },
        {
            "version": 2,
            "recorded_at": "2026-10-29T19:46:03Z",
            "content": "{\"cpv\": \"43261000\", \"url\": \"https://platformazakupowa.pl/transakcja/1397844\", \"buyer\": \"Gmina Miejska Hajnówka\", \"title\": \"ZP.271.26.2026 Zakup i dostawa koparki kołowej z osprzętem\", \"region\": \"podlaskie\", \"source\": \"platformazakupowa\", \"status\": \"active\", \"cpv_more\": [], \"location\": \"Polska\", \"source_id\": \"1397844\", \"deadline_at\": \"2026-11-06T10:00:00Z\", \"notice_type\": \"Ogloszenie o zamowieniu\", \"published_at\": \"2026-10-29T19:34:38Z\", \"notice_number\": \"1397844\", \"procedure_url\": \"https://platformazakupowa.pl/transakcja/1397844\"}",
            "content_hash": "4cd573702ea93a02c239a69f810e408e99c722aab295554082299eb139473b3d",
            "prev_hash": "b7bcd8d736d39d59606dead91fb8c060828a07cd721911e34efe3d2cd7b0af3e",
            "hash": "c8f02323d3ee0037d2ad45eb9a193c35af960cdd8d33ee52c186c5abd2bb55b2",
            "actor": null,
            "seal": {
                "id": 6,
                "digest": "e733200881d78faed3c108fa90cea332062fa40f3af23fcfd3f901e311d96e33",
                "file": "https://tenderiq.pl/rejestr/pieczec-6.txt",
                "proof": "https://tenderiq.pl/rejestr/pieczec-6.txt.ots",
                "bitcoin_block": 973754
            }
        },
        {
            "version": 3,
            "recorded_at": "2026-10-29T23:42:28Z",
            "content": "{\"cpv\": \"43261000\", \"url\": \"https://platformazakupowa.pl/transakcja/1397844\", \"buyer\": \"Gmina Miejska Hajnówka\", \"title\": \"ZP.271.26.2026 Zakup i dostawa koparki kołowej z osprzętem\", \"region\": \"podlaskie\", \"source\": \"platformazakupowa\", \"status\": \"active\", \"cpv_more\": [\"43200000\", \"43300000\"], \"location\": \"Polska\", \"source_id\": \"1397844\", \"deadline_at\": \"2026-11-06T10:00:00Z\", \"notice_type\": \"Ogloszenie o zamowieniu\", \"published_at\": \"2026-10-28T23:00:00Z\", \"notice_number\": \"1397844\", \"procedure_url\": \"https://platformazakupowa.pl/transakcja/1397844\"}",
            "content_hash": "51a5159bf6d053c93bf2f04b844cb80d5866ce5b7a70661c170425a9e2808cdd",
            "prev_hash": "c8f02323d3ee0037d2ad45eb9a193c35af960cdd8d33ee52c186c5abd2bb55b2",
            "hash": "d5fd0b068c1a9bae280840cafcab13c74840211e6ad88e5f4000baae0b3d0dab",
            "actor": null,
            "seal": {
                "id": 7,
                "digest": "a9f75e7ec6726860fada5c5807cac164b76cf44582f14a01cd7b4a36f579f813",
                "file": "https://tenderiq.pl/rejestr/pieczec-7.txt",
                "proof": "https://tenderiq.pl/rejestr/pieczec-7.txt.ots",
                "bitcoin_block": 973897
            }
        }
    ]
}