{
  "manageEntity": {
    "action": "Save",
    "entityId": "712154736",
    "entityType": "Track",
    "nonce": "0x71b98aca08f63e4651e662f3b705d7f651b6017543b4d22102122c64f280732f",
    "signature": "0xfbf42c83d5c7e0a58fe83082f0735698733961c56589600446a824452b8d031817d8465ad11bb3034929c5a817851fcc4c539053f6eabdd2bc44a665ca307d671c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}