{
  "manageEntity": {
    "action": "Save",
    "entityId": "1402295474",
    "entityType": "Track",
    "nonce": "0xe74db58534a9f781135976b003913b82ceb8836cb0ce13b3e699b045554bc90c",
    "signature": "0x74e4fbbcdfd4cfa1270f1cde7d2a436faaa4f4792697cee133d8db01a2560d8045c172dd594d002667b4f664703684621e8e0826ee08e8cdd102a2c1cd2a7cd21b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}