Thank You Etresoft!
In the meantime it's exactly what I have done. I don't know how much this will make the hackers' life harder, but at least it's a deterrent. I have also told the ptrace to deny any attach. I hope everything will work. Thank you again.
Incidentally I have discovered your answer by chance. Is a way to get an email or notification when someone replies here?
LeonardoDev
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Thank you. So, as I understand:
1) we developers are obliged to codesign the bundle.
2) the codesign don't let us add our protection (as an additional checksum file).
3) the codesign can be easily violated (as I have seen my own macOS app and even the Apple apps, codesigned and notarised, cracked on some web torrent web sites).
As you know, is a way to make my macOS app hacker-proof ?