{
  "manageEntity": {
    "action": "Save",
    "entityId": "537765",
    "entityType": "Track",
    "nonce": "0xddb501d4441e5c04aa65e6cca1fdd359e81f41bf3608c7be80491dc82ac41e25",
    "signature": "0x3b2a00166c9afbe5dcd4994d954fc491b405e0cdeacc1d2c9c712e8f605b3a2215a522fa1c79b659df9dc585e0b55a9fea90a9f7190dfad0a8755119574a7a031c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}