{
  "manageEntity": {
    "action": "Save",
    "entityId": "399413",
    "entityType": "Track",
    "nonce": "0x220a98af99ccee0c28104ea400fea9eab3eb0f21dd6c9cde05f2941fac3654e9",
    "signature": "0x59800add65ff71378e158c45e1fd374895205f44d2f57deefab7b5bcaf718cd04c50313f8be0cccb1739b5fba0f0c9c49f01b17f069cf70269a4543d54e21d101b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}