Qbit depends on openssl, but the one installed from macports.
If you see:
Dyld Error Message:
Library not loaded: /opt/local/lib/libcrypto.1.0.0.dylib
Referenced from: /Applications/qbittorrent.app/Contents/Frameworks/libtorrent-rasterbar.7.dylib
Reason: image not found
Fix it with:
sudo cp /Applications/qbittorrent.app/Contents/Frameworks/libcrypto.1.0.0.dylib /opt/local/lib/
or with:
sudo port install openssl