[mike_hearn]

I really doubt anyone checks them. It's not integrated or enabled by default, there's no way to pin keys in the build files, etc. GPG isn't the solution to such problems, unfortunately.

In one of my old projects (bitcoinj) we did write a Maven plugin that let you put the hashes of the dependencies into your build file.

However it's rare to see Maven/Gradle builds that accept version ranges. And once downloaded it's cached.

[lmm]

There's a plugin for checking it in maven ( http://www.simplify4u.org/pgpverify-maven-plugin/plugin-info... ) that allows pinning the keys.

Ranges are rare but I'm not sure why - maven actually has very good support for them. I guess it's just that they're not the default?

[oblio]

Version ranges can create inconsistent builds. That's why they're not default and that's why they're not really recommended.