{
  "manageEntity": {
    "action": "Save",
    "entityId": "297904",
    "entityType": "Track",
    "nonce": "0x433a9bdb53eb09db600da30197fe83f1720d55f9be9b44673958db8ce25a3c5c",
    "signature": "0x99ed09236bda68103c9285918ef1cab301c8cd40bfab67ef0e0245285bb7f56a2579bd17d4f5cfd5a3960960aab3cc574aaf2ab69f1c9aa509a4eb72632147a91c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}