{
  "manageEntity": {
    "action": "Save",
    "entityId": "74065516",
    "entityType": "Track",
    "nonce": "0x8e759f6d4d0ae888df02ea6fc799ef86a555061af6db97e389991b7086916caa",
    "signature": "0x73474fe1ee28a5dbf5df39fbe0adf50dfc25820a9f3044f7ed0be22b4d20f818507bcc8c140ffa09acf9260107a2de97a9707a47ca165da8d3f30df9f3b8f9491b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}