{
  "manageEntity": {
    "action": "Save",
    "entityId": "518934",
    "entityType": "Track",
    "nonce": "0xf33f99868094759bac27bb04b3b5856a16e13887d9ce913a046e5467dff6e1b3",
    "signature": "0x2dfa055828adef275e7d699956be5b8b62d74f0ff32e03660809b6e22822207e0f7693fbfb3cd188f499c9822a54f7d5d1965a4934ea6c13aef26fc39d0f800d1b",
    "signer": "0x45C74e4f36E4e5064C5321eeED3748fD52B04eA8",
    "userId": "133970929"
  }
}