{
  "manageEntity": {
    "action": "Save",
    "entityId": "1249550226",
    "entityType": "Track",
    "nonce": "0xc5c6a41e0962ea86735c643f6c5cb558c8942c2993cbb460805e04e3c5a236be",
    "signature": "0xd9e71ee3a2e718ac37a646f3fbb52bc646bd3c2022c7ad16e898bca188da72252714744cacd59c86f405f54f4470e7f862465fb239e12a11388cf5d898b50ec21c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}