{
  "manageEntity": {
    "action": "Save",
    "entityId": "1399777346",
    "entityType": "Track",
    "nonce": "0x75ac44bdafcc9ce02964489a83ce8a0f3d8c73c39eee5f46dc388d936066c00e",
    "signature": "0xe7def16fe998e9b55badb27bafd2ba5a98f7b15e2225b96a84a7efa207418a3231a746a5183e8a8df0743da4945432485bd1b6429b9a3b332fa7c67a8c326dcd1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}