{
  "manageEntity": {
    "action": "Save",
    "entityId": "596843",
    "entityType": "Track",
    "nonce": "0x40aca5b4c2dc58b037737da2cb302b0d2a69edd5d82d332320fd44383f3f9df6",
    "signature": "0xc488397c2cbea1b386913ac7d04e06aa1d150eede7e83173afeeb44afcfb7e835d15395ff120daee933acf62bc331a6852619500c69d8f2d7b2c7128803bafc71b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}