{
  "manageEntity": {
    "action": "Save",
    "entityId": "666136",
    "entityType": "Track",
    "nonce": "0xcd70d6fe4b589377ce054c8218ad9dd4e9fbb86f195bfb202c99c2ef91af82a3",
    "signature": "0x62ee780cee5ca8c439fbb46e4fd220617e131711c91aa27d54655c73e8f3fef05ea576e1f13db0b924208aa4ea624beeae740b5e9e0797f04b8b8968eee44fd11b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}