{
  "manageEntity": {
    "action": "Save",
    "entityId": "1399566182",
    "entityType": "Track",
    "nonce": "0x61255374ed356d2ada46dce7d0f3b95a3217be43fdeff46047129470d1edd020",
    "signature": "0x4315cef4a5c1f392015653eab6185ada2a09669bfd5cee221b91491b31f1eeb47fcc03976d84e765c47cd928a13111e05f02930211a67cd65db354f9e50d9cdf1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}