@civodul Interesting project, I haven't come across that before.What we really want is for someone to pick a point in time, ask contributors to set their system clocks back by the appropriate time interval, make a modern bootstrap-build guix, then make contributions to the system contemporary to the system clock. Commits to GIT will then really be pre-GUIX, and it would be possible to *guix time-machine* to a point in the past!