{
  "manageEntity": {
    "action": "Save",
    "entityId": "1820043616",
    "entityType": "Track",
    "nonce": "0xdf8a62b47b340dfb7c7823c324ed2c035a1896efd3348ce7d53efe70b1573e78",
    "signature": "0xe15cd788ea1eff6ce832eebf19f9eb74e15c77b3c1e9c97cf70a87e0d5481cf566c3f5d9c44035049536fcaf9da65d8daf66452291cba35f1afc83e0383cb45c1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}