{
  "manageEntity": {
    "action": "Save",
    "entityId": "1843821858",
    "entityType": "Track",
    "nonce": "0x67c044965ff845dbaabdc75942f6057b3d64beef994572938fb2b3ddbfbed2bb",
    "signature": "0x067517b7fa683f49e8adcdf246e493690b8cabd033d4bdecff4dd1f72faa81b0153e7250e39e6940ff9289a2288320c631491fe57fb49b3eb50175e7805c17f51c",
    "signer": "0x63EbE5a1B5C5F156330BDf810f5fFf6A224c75c8",
    "userId": "309080"
  }
}