{
  "manageEntity": {
    "action": "Save",
    "entityId": "989903",
    "entityType": "Track",
    "nonce": "0x54d9ec3a045a6adf973e4028ab4efc22976a1f3e4ae0527522f1ee41a8c38308",
    "signature": "0xc4c645d29de2ffd312517322cee9c77b29365969c2d47e1b39edd3f6b8914a234503119d310ed1eb70e4f9ec1827e48b033c22d2ca5ed977ef469661986a08ec1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}