{
  "manageEntity": {
    "action": "Save",
    "entityId": "748025521",
    "entityType": "Track",
    "nonce": "0x3680b5dc63a2fd56f3790a70d82e2653950504462fc149fae07d98cff47f1ac9",
    "signature": "0x9729dead5320173074d6270d4b75f8d940f6fccf30edf422a5ae4c4aef99831a2eb44cbf5623502abbf365654c050bd501d1771acf9abaab731aaf3acc8ad1881b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}