{
  "manageEntity": {
    "action": "Save",
    "entityId": "1485785567",
    "entityType": "Track",
    "nonce": "0x0c1107ff8ea2cc89256280c968dcc3ad96026681701897d51146398c59dcdefe",
    "signature": "0xbfb45705ff123ec77eb95f516bac6a6cbac0f6f106af35770c88d63ff91bfeb37da5bbdc4bd8f85fe194e6768c84027416cfca1c9b3fe8da2d056a6fcc2342781b",
    "signer": "0xC7f1C5c105933bBdAC0c8A3219204f23AD4f3320",
    "userId": "381638009"
  }
}