{
  "manageEntity": {
    "action": "Save",
    "entityId": "638462579",
    "entityType": "Track",
    "nonce": "0x50fbada1350dd2573eb698be924b3a07f7c10f4663ef60fc51e5f8149d7a6230",
    "signature": "0x10eca8262f6837fcd3db53007d267c2cc4cc6ca6e5aaea4d29d7fb823c1a0d352dca43d9212d11d63aede146517a89f7b1f42f5530ecb325e305ed9a4148285b1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}