{
  "manageEntity": {
    "action": "Save",
    "entityId": "341990",
    "entityType": "Track",
    "nonce": "0xd3f2b5fa390761265600e8c9f22691c8d5c080fed5c9b8e3444013d2950849a1",
    "signature": "0xc5464aabe0b8881869f517dd2fe802b11012017511cd3be9c616ed39958b18c87f75bb2b9a0f23af5251f7be0762804a285e142f19df7f87cbf393c6b3cd80921c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}