Check My Math – Nix vs. the Most Complicated Program on Earth

Nix hashes do not guarantee build success. You can have a hash for a build that always fails.

Nix hashes also do not capture all possible sources of variation. You can have two builds with the same hash, one of which succeeds and the other fails.

Lastly, check out the failure rate on the NixOS release builds: https://hydra.nixos.org/jobset/nixos/release-23.11