{
  "manageEntity": {
    "action": "Save",
    "entityId": "584709886",
    "entityType": "Track",
    "nonce": "0x77961a65225e428efdd810d8cefc86189d2d5330edfd8f40adffdaaab09e4407",
    "signature": "0xd8fc70fe62d7e2843476ad3a30a873e2cefc9373ad85063eecc5d8943e7381e224c757cc7118fde1bf24769a9a67513a7350c89132743b8b0e1ad6a29f11a1f01c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}