Finnix build infrastructure has been stored in revision control for over a decade, and ISOs have indicated which branches/commits have been used to build them for a few years now. However, final release ISOs had still been built on personal environments until now.
Going forward, final releases will be built on public CI infrastructure which will log the hashes of the ISOs, and the ISOs will contain links to the build logs, allowing for cross-verification. (2/3)