{
  "manageEntity": {
    "action": "Save",
    "entityId": "50837302",
    "entityType": "Track",
    "nonce": "0xbcb5a89825089617130813107a93b1f2cf4ac497e1bda02c541c7034f8569644",
    "signature": "0x64af2ebc1d13653f532e96cfb7c5a6a0a7fdff7a408ae96dcf68b27331fd75243d9bfd641aab02350065abe2bbe8d475d71d8d20cb85963b7acc1822dc8dbdfb1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}