Bitcoin Cache Machine was a git repo I worked on for a while. I had really big plans for this project, but I ended up abandoning it for various reasons. One reason is people thought I was referring to Bitcoin Cash when I said it. You can think of Sovereign Stack as Bitcoin Cache Machine version 2.
I learned a tremendous amount from this project and the codebase I developed there has been extremely useful as I pursue other projects!
Check out the github repo to learn more about this project.