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-2.3.7.dmg
2611ef7485447fd53c1ad46551cc3e0ef23bcddbfaecd725a283b99bb4a91a95Download for Mac
$ certutil -hashfile Jaxx.Liberty-setup-2.3.7.exe sha256
e68ac2c572eb03ca12228056c2b2a77e3027946fffd5c48a781d0a86464ecf04Download for Windows
$ shasum -a 256 Jaxx.Liberty-2.3.7-i386.AppImage
9f34b6c5895ecb2c56f31f298e20eb39c1c6cd267207084196e526c8ca8e061bDownload for Linux 32
$ shasum -a 256 Jaxx.Liberty-2.3.7.AppImage
b4a85070f7d2f4e88e87ceb774670687290bce8deb21733ae70dd3fcf9588f52Download 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.