{
  "manageEntity": {
    "action": "Save",
    "entityId": "1788780750",
    "entityType": "Track",
    "nonce": "0x7f59dcd27e37a230d46a8a3664e2f2ffd0279a8542c08209ffa5cbec7251603e",
    "signature": "0x2080b5b7be9181e111f72ec0133137f9c03fc6bbfbac571bf2e995d07090bd5f1d9c8439bd194fc1afeb47ccf902950f0eb598f22f65d4c46fdd90b59f08750d1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}