This is really cool. I've already got a build machine running hydra, but haven't yet used it as a binary cache. I might give this a go. Ultimately I'd like to

This is really cool. I've already got a build machine running hydra, but haven't yet used it as a binary cache. I might give this a go. Ultimately I'd like to see Nix integrate with distributed, content-addressable systems like IPFS (e.g. https://github.com/NixOS/nix/issues/296 https://github.com/NixOS/nix/issues/296 ), especially for inputs like tarballs, git repos, etc. It's all well and good having reproducibles builds with the whole OS pinned and checksums on all the inputs, but if the tarball URLs disappear we're still screwed :(