{
  "manageEntity": {
    "action": "Save",
    "entityId": "1075894573",
    "entityType": "Track",
    "nonce": "0x5594e0457c16e3aaa89a059524b20c9cafff1a0d88bacd32b9cefa9ec96b02e9",
    "signature": "0xfee01133f92e879b6de4c957fa6713461702b1046585017c989d22fe604cdc11015ba4e902b0450e50216a44cede5c3145b636e6e0388a2713892b1d53a9b6711c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}