The checksums below are a simple way for you to double-check the copy of Jaxx you are installing is genuine. You can match the checksum in your instance of Jaxx with the data below.
$ shasum -a 256 Jaxx.Liberty-2.3.1.dmg
ac967f288660d74922f8b3a20d483690a19ef3349b973082fb37ffa91231297dDownload for Mac
$ certutil -hashfile Jaxx.Liberty-setup-2.3.1.exe sha256
df64957bde7a01399ffde9b84daf9c1709c6c16c2ff50da8244b9b6180c12e0eDownload for Windows
$ shasum -a 256 Jaxx.Liberty-2.3.1-i386.AppImage
dc73cbc904c556ccaea2493a82bd59f8e7f2081967fbda1f39dd767b3847976dDownload for Linux 32
$ shasum -a 256 Jaxx.Liberty-2.3.1.AppImage
9df53b573812e9fe15ead5ba7f4054ed8d525518943a6426b34dac92c750a7f2Download for Linux 64
*Mac OS X Note: Depending on your system settings, the system might warn you that "Jaxx can't be opened because it comes from an unidentified developer." You can either change your system settings to allow apps from unknown developers in your "Security & Privacy" settings, or simply right click Jaxx → Open (as administrator), which will prompt you with a warning.