{
  "manageEntity": {
    "action": "Save",
    "entityId": "487790793",
    "entityType": "Track",
    "nonce": "0x8fbbc6cdcaa0ac4852dc3a7bb90c5130687f461a6b798440f0adb1cbbde558b6",
    "signature": "0x562575113133abc427c099bcc7d1a0921af36336b49e97968d7e8cd5d1b4257561c52ac4246cef96b4820b86ca072d42c81a1ec2c2e732dd36aa95e3027db7121b",
    "signer": "0xD06A00B950F1f08B348e3cEf0B75Da0010adF313",
    "userId": "238712"
  }
}