{
  "manageEntity": {
    "action": "Save",
    "entityId": "789131",
    "entityType": "Track",
    "nonce": "0x1b3704dbff344450fef072820cb6475c2c7e468d7ed2020e5119081fa3ca44c4",
    "signature": "0x5b122e21a1e1535539e5c63bca655d2b1c44ffb94418b4bba2412da890b0d1aa56a08ec99b729b06b8f499f547c499cb40b9cc8c1a998f75491c3f97342ddd5a1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}