You can copy the data and past on SHA256 online tool. Remember to leave any space from input

{
  "id": "recxaPVHu4bEPvYAW",
  "fields": {
    "Name": 10,
    "Notes": "Prova",
    "Attachments": [
      {
        "id": "attbsNi7TWZhQvmG4",
        "url": "https://dl.airtable.com/.attachments/cdc76a29b5fd989b729a2091c177817b/8262cd4c/Blockchain.pdf",
        "filename": "Blockchain.pdf",
        "size": 1242772,
        "type": "application/pdf",
        "thumbnails": {
          "small": {
            "url": "https://dl.airtable.com/.attachmentThumbnails/cd1a3eaba67e41b404862c6928654f1c/aea01a2c",
            "width": 25,
            "height": 36
          },
          "large": {
            "url": "https://dl.airtable.com/.attachmentThumbnails/b629ad5a3a56a247ec3a30a0fa801bb6/6c52ea41",
            "width": 362,
            "height": 512
          }
        }
      }
    ],
    "Status": "Todo",
    "Field 5": "kkk"
  },
  "createdTime": "2021-08-07T14:21:41.000Z",
  "type": "new_record",
  "metadata": {
    "baseId": "app3pRm9ULoW8k9ps",
    "tableId": "tbldavvIfd1yhhZFP"
  }
}

This is the Hash inserted in the Blockchain Transaction that you can see from Blockchain Explorer

623d84cc6986f371afce1014339d593dfa4c2923edfbe217c01d9a73c248ec44

This is the Date and Time of the Transaction

2:26:50 PM - Sat Aug 07 2021

Transaction Hash: 0x45a6...15f