{
  "manageEntity": {
    "action": "Save",
    "entityId": "1298723620",
    "entityType": "Track",
    "nonce": "0x407d4b51ec4032377bf1c18e0018ece9710d175e27c5c56eff73a903d7804efa",
    "signature": "0xf95f75d350d0f641540d8a9edb7328aac8212b38b1b820533fedc38fa9e9ed5934e83b8f6c254b668add4af710a3c991348e906d8798aba83da716e7a587ba091b",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}