{
  "manageEntity": {
    "action": "Save",
    "entityId": "939071282",
    "entityType": "Track",
    "nonce": "0x7371c4505b71b238819852dad1905421cf32387e56168c6cde350ee9719dfc0b",
    "signature": "0x446740b4c83cd6f906cf3748282b2943d0a81eb220548b4a51345282373281660de5212579a7887354311a81706b56f944ffbb8360809b82ca947104a6f612381c",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}