Vaklinov's GUI wallet, as ported to ZERO, has been independently validated.
The wallet is based on Swing, so very same Java code runs on Windows and on Linux.
The source is on Github and rather accessible, so take a look for yourself.
It's been in use by Zcash and Zclassic teams for months, before we talked vaklinov into releasing it for ZERO.
Enjoy,
  Tearo