Many debian users will not trust a deb file out in the wild - even if the signed source is available. Freenode #debian experts giving support will not support any unofficial applications.
So to add credibility to the bitsquare app, I suggest getting a debian developer to submit the app to an official repository.
This is also a good way to collect bug reports. I see that github.com/bitsquare forces users through a login-wall. Although the github signup is painless compared to other bug trackers, the debian project allows simple email-submitted bug reports which debian users are accustomed to, and no account creation-verification needed.