[callahad]

Not yet. There have been some efforts around adding IPFS support to Nix, as well as making its storage fully content addressable, which would allow for peer-to-peer archival and distribution of source. https://blog.ipfs.tech/2020-09-08-nix-ipfs-milestone-1/

Guix, a similar project to Nix, has been tackling this head on by automatically falling back to the Software Heritage archive when the original upstream is unavailable: https://guix.gnu.org/en/blog/2019/connecting-reproducible-de...