{
  "manageEntity": {
    "action": "Save",
    "entityId": "1617999300",
    "entityType": "Track",
    "nonce": "0xbcec10fc5ae6e044b4e142c19d14fd2bda9ef4eebb0ed94663d909bd57015f89",
    "signature": "0xb70f3e940b33c0ed93df35834e76a4154d9b37953281af5ab222d411b6bdf416787aab13bddf43773b4b5c45ec2633287ea8354e7b87fad60de4fd630df564d01b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}