I assume the Docker image provided by Signal does reproduce the Android build, but since the Docker image is a giant non-reproducible binary blob it is (as stated in the blog post) a &quot;weekend hack&quot; rather than a useful reproducible build system.<p><a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=11403867" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=11403867</a>