{
  "manageEntity": {
    "action": "Save",
    "entityId": "479765370",
    "entityType": "Track",
    "nonce": "0xdf3b45e1ba00fd9f4275d2a005f40a38c6ff481bc73dd643a806954b6493155a",
    "signature": "0x74330c9ffc0c4eeb8f1aeb2bb2260646700d2f28e416b1bbbdb17c4478678b0a70b3a8919aab8187ff7d465ce75f07d284780992f6bc02c9dbd829bca33b3ab61c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}