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-2.3.4.dmg
4571a3a3f75b3bedd18ec3fe59d97d073b06804f9fd2d46174b6487b88f00279Download for Mac
$ certutil -hashfile Jaxx.Liberty-setup-2.3.4.exe sha256
8eac4c92986f5cfd2cb7f545ee44fe90e84af53c26307d9bef8783561459a896Download for Windows
$ shasum -a 256 Jaxx.Liberty-2.3.5-i386.AppImage
c62de6ed4c075ddc6d8ab6624401d053ed258099fdab5e7a1020edd899282831Download for Linux 32
$ shasum -a 256 Jaxx.Liberty-2.3.5.AppImage
7256f391c445abd64198064493bf7f9fe8aa24d576932794ec77bb6636b90699Download 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.