{
  "manageEntity": {
    "action": "Save",
    "entityId": "1657112353",
    "entityType": "Track",
    "nonce": "0x35ed7947d7fd4d017cb8e64afd64074afa95026b514d7737f933f9378151e480",
    "signature": "0xd8cfe5962b85f4fb40f6c51163124a6b1ee3dc4d9317294a0c7ef0f7cb28c30c0fa93e04595d8457e314ab6edfbb482c52d076ebfd4df902d216c6fd7a7aded31b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}