{
  "manageEntity": {
    "action": "Save",
    "entityId": "778715473",
    "entityType": "Track",
    "nonce": "0x1d668c424a1f716191114a81010753ed9bdde40a33d91b520eba0f17670ae842",
    "signature": "0x43a71240ece41f1267f1456e677bac9ab826286780813adc4da2181a8620c193098ca43935ac0e16d46f10db7416af6f7b8de3ab392ff3ec183bd9f428b21b141b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}