Sure thing. Thanks for reviewing the code, we are always happy to get additional eyes on it. For your major bug I have to disagree about the major part, the RNG works well but yes it could work better, I will put the long answer in your comment below. As for the short answer I created a video showing how the OnlyKey uses capacitive touch for RNG. The blue arrow in the video points to the values that change as the buttons are pressed, you will see the four values per button providing random entropy, this is what goes into RNG.stir. Keep in mind the RNG is slowed down for the video, actual entropy gathering is much faster in use - https://vimeo.com/381733010