{
  "manageEntity": {
    "action": "Save",
    "entityId": "748242134",
    "entityType": "Track",
    "nonce": "0xecf6c092087614312f071d615efa41d9117fa85ba12984cd9fbc8251563ee791",
    "signature": "0xbdb42e63a7b5529ceeab0b9dba6c6be543df21e6cce48dc9e5ea8c2bd0b5635650801090bfb2380b140481b0be415143df2b87ce3b15eb10a18963e4367725911b",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}