Verifying #ReproducibleBuilds of packages actually in #Debian ... is not exactly a new thing, but is harder than it ought to be, because you need to rebuild with the exact same packages that the original build was built with, and snapshot.debian.org is less than entirely reliable...

So I tried rebuilding packages recently built on buildd.debian.org and it was reasonably successful.

Long-term we will still need some sort of snapshot-like functionality...

https://lists.reproducible-builds.org/pipermail/rb-general/2023-September/003076.html