I feel the need to point out that the "Bootstrappable Builds" project is a working group from a Reproducible Builds project which where interested in the next step beyond reproducing binaries. Obviously this project has seen most effort from Guix :)

The GNU Mes C experiment mentioned above was also conducted during the 2019 Reproducible Builds summit in Marrakesh.

https://reproducible-builds.org/events/Marrakesh2019/