{
  "manageEntity": {
    "action": "Save",
    "entityId": "1504577420",
    "entityType": "Track",
    "nonce": "0xce0a9bc9dd68dfbec7729df92878689772ee011c53bd28e47b50da00fb7c7bbd",
    "signature": "0x524d31efc2133bdc3ea949ea4edd0c5a1dcb846294bbb928009ea9b6a3597d1e33b7aadc4ca116521bff8154c970a4e4b5e397bb25cedaff7b26cb12dce0980c1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}