[
  {
    "authorized_account": "<AccountAddress>",
    "from": {
      "Enum": [
        {
          "Produced": []
        },
        {
          "InTransit": []
        },
        {
          "InStore": []
        },
        {
          "Sold": []
        }
      ]
    },
    "to": [
      {
        "Enum": [
          {
            "Produced": []
          },
          {
            "InTransit": []
          },
          {
            "InStore": []
          },
          {
            "Sold": []
          }
        ]
      }
    ]
  }
]

None

{
  "Enum": [
    {
      "GrantRole": [
        {
          "address": {
            "Enum": [
              {
                "Account": [
                  "<AccountAddress>"
                ]
              },
              {
                "Contract": [
                  {
                    "index": "<UInt64>",
                    "subindex": "<UInt64>"
                  }
                ]
              }
            ]
          },
          "role": {
            "Enum": [
              {
                "Admin": []
              }
            ]
          }
        }
      ]
    },
    {
      "RevokeRole": [
        {
          "address": {
            "Enum": [
              {
                "Account": [
                  "<AccountAddress>"
                ]
              },
              {
                "Contract": [
                  {
                    "index": "<UInt64>",
                    "subindex": "<UInt64>"
                  }
                ]
              }
            ]
          },
          "role": {
            "Enum": [
              {
                "Admin": []
              }
            ]
          }
        }
      ]
    },
    {
      "ItemStatusChanged": [
        {
          "additional_data": {
            "bytes": [
              "<UInt8>"
            ]
          },
          "item_id": "<String with lowercase hex>",
          "new_status": {
            "Enum": [
              {
                "Produced": []
              },
              {
                "InTransit": []
              },
              {
                "InStore": []
              },
              {
                "Sold": []
              }
            ]
          }
        }
      ]
    },
    {
      "ItemCreated": [
        {
          "initial_status": {
            "Enum": [
              {
                "Produced": []
              },
              {
                "InTransit": []
              },
              {
                "InStore": []
              },
              {
                "Sold": []
              }
            ]
          },
          "item_id": "<String with lowercase hex>",
          "metadata_url": {
            "Enum": [
              {
                "None": []
              },
              {
                "Some": [
                  {
                    "hash": {
                      "Enum": [
                        {
                          "None": []
                        },
                        {
                          "Some": [
                            "<String of size 64 containing lowercase hex characters.>"
                          ]
                        }
                      ]
                    },
                    "url": "<String>"
                  }
                ]
              }
            ]
          }
        }
      ]
    },
    {
      "Nonce": [
        {
          "account": "<AccountAddress>",
          "nonce": "<UInt64>"
        }
      ]
    }
  ]
}