{
  "manageEntity": {
    "action": "Save",
    "entityId": "688243571",
    "entityType": "Track",
    "nonce": "0xb598f539f875ce16857a495e123623271f83d7582efb9ff7738e94051f42d9be",
    "signature": "0xdd82b8c5344f6b6178de4a26d1d3226905b6849d6bd930eda499a43cff45a55a420e5ecb8bf576a63957b1ed17bac01103b5a8a79865f72320301641aa8b01881c",
    "signer": "0x2F7db4C1AE3922aD0f32CEdED1870278dd17b64b",
    "userId": "467213409"
  }
}