{
  "manageEntity": {
    "action": "Save",
    "entityId": "748276670",
    "entityType": "Track",
    "nonce": "0xd89ad7a1ce4da74ee1e8d6cd3720fb3efdfd2c97d93fa9858ef9c461337c19d5",
    "signature": "0x9c1d33f6231570f8314ddf38349b013675bbc824e7c65acdd5f5f24d2996c0ee08241a50d7dcac46ec67d2fa7fe63ee0a19f83520b5c6bb2ee2ccad52116ce661c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}