{
  "manageEntity": {
    "action": "Save",
    "entityId": "1373041589",
    "entityType": "Track",
    "nonce": "0xe76cf58908e7cedf16dbd78e9a08d8acd910e4bc05da9a26208c26912526f491",
    "signature": "0xfc3f0ad6ef931ad1e36f4aceacb9cb43110756c860d1cbd8cffacc3a3d2fe8a96c12ed8f47665e79a197726601f9b107fc41374397d4094f56623546cb322c9a1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}