{
  "manageEntity": {
    "action": "Save",
    "entityId": "1304237977",
    "entityType": "Track",
    "nonce": "0x466e4589957c2f98aa86f9a904457c724a375669e58b4ea4a5817e85d441d1fd",
    "signature": "0xbf191f314f40328c013272a23233ea305343237e0c1322277a64a265a5703ddb76e1776b1a6856fd45f5c8a4a26988246d1ff0f4fa4327a8d9f068166b52b1341c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}