{
  "manageEntity": {
    "action": "Save",
    "entityId": "402784815",
    "entityType": "Track",
    "nonce": "0x89c80aa97f3d44b6740b679f1d390a69b9599e64ddad7f170d3ff6c5f28f5cc7",
    "signature": "0x81ee002d0acb712d4dd105ed00ff5898b108b8cc9e3731abc39bc38e389530bc3087d1524fb8a4cf415b7cc071ba28c99573b4a57bc8a4b8c637cde6ca01c6381b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}