{
  "manageEntity": {
    "action": "Save",
    "entityId": "604202",
    "entityType": "Track",
    "nonce": "0x3edfcb2c5266be60945122596482d5a06c51cc2e88b7c45634231bfaf0e2a424",
    "signature": "0x7ea7c7c05c7eb9f228df578dd818337e4592f5914170a3dc3f1f044d41ff3a320c6b97752f447992287a66a0011504b6040d707d9454cc245aea23d5dab034e01b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}