{
  "manageEntity": {
    "action": "Save",
    "entityId": "209211",
    "entityType": "Track",
    "nonce": "0x30b192ce83723cca9b7cfb5b8f8591b494e2f9f12c841a46a889a2c105dddb5f",
    "signature": "0xbff678dfab4ca753277092960187ce45d708b45fba588f2d39f8e8b3162065813369e4ad3735bf18018c649989097ca1379bb1ba9538f040246e89b8ad79c6f41b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}