{
  "manageEntity": {
    "action": "Save",
    "entityId": "1556618528",
    "entityType": "Track",
    "nonce": "0xae29b7558823653577c824e7cf651410076156a1641c23a48f1fd25e9e2e9a14",
    "signature": "0xa8d03023863d475022dcc0770dec0fb3efd6df8b030ab73f2490d94ccca81d623b943fb07834a8eca2c2c22027eaf99cf45deba62cfe88b21f2f3753c4a112961c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}