{
  "manageEntity": {
    "action": "Save",
    "entityId": "602491833",
    "entityType": "Track",
    "nonce": "0xb7df8097feb90292221202c37cebd244bc6f74956833b686b080462c5353c7ba",
    "signature": "0xa06c72303d6e07e29039be6bae5edb4d07af2d87e8decc8438d9e0c41214f7ef6c30e8b8a03ee098758f5d3fe3703f06a6a6414be2c2d41cd244c9fa8ae50e7e1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}