{
  "manageEntity": {
    "action": "Save",
    "entityId": "1238247317",
    "entityType": "Track",
    "nonce": "0x963838bbdf249e1c87cbfd34d2eed7a5f2009c8608f0df39bda9be63a9d5e144",
    "signature": "0x6d28679bbcbb8e6a1a9e858cfdb94678b1f2e4a52dc7b0f2dab7f2f4ed0726c63cb4fcfbf022ad8adee40094a52c7a31abf15dbec6806c4146534869e19cabba1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}