{
  "manageEntity": {
    "action": "Save",
    "entityId": "469663441",
    "entityType": "Track",
    "nonce": "0x5039923d57c6f424c2abb2557a068ad6f95bdab983ff65cf162210d4d7a8dd5d",
    "signature": "0xe17912d608ca94e341d1abaec62692a0f89d8e8fc497f220ce518738c3c26c7e360c03618289a64b56689f762853912f157e0eaa3b1ced734532a00198f91a231b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}