It's also worth pointing out that once a version is published to crates.io, it can't be altered, specifically to prevent social engineering attacks. If you're worried about it, that means you can audit the frozen codebase for any given version from a top-level crate down through the dependencies, and once that trust is established, it can't be leveraged for a silent dependency change later on, which can only happen through a version update on the end-user's side.
