Nix does not particularly care about the hash of the result of a build, but mostly only the hash of the input. When you download a package from the binary cach

Nix does not particularly care about the hash of the result of a build, but mostly only the hash of the input. When you download a package from the binary cache of Nix, you use the input hash. The binary cache contents may differ depending on the system of the build server. Nix does try to eliminate nondeterminism in their builds though.