Arch Linux has .BUILDINFO files embedded in their .pkg.tar.zst files, which references files on https://archive.archlinux.org/ https://archive.archlinux.org/.

Arch Linux has .BUILDINFO files embedded in their .pkg.tar.zst files, which references files on https://archive.archlinux.org/ https://archive.archlinux.org/. Debian has .buildinfo files over at https://buildinfos.debian.net/ https://buildinfos.debian.net/ referencing files on https://snapshot.debian.org/ https://snapshot.debian.org/. This is not special to NixOS, documented and archived build environments are an essential part of accomplishing reproducible builds for an operating system.