With macOS Mojave, Apple introduced support for Hardened Runtime and Notary service. These two services are designed to improve application security on macOS. Recently Apple has stated:
“Beginning in macOS 10.14.5, all new or updated kernel extensions and all software from developers new to distributing with Developer ID must be notarized in order to run. In a future version of macOS, notarization will be required by default for all software.”
Today will help you to understand new rules from the Xamarin point of view.