@balaalimaestro: I recognize that your're a kind of computer nerd, though not yet familiar with the a bit tricky jb thing...
In other words, simplified: There are two keystores in connection with the Kindle jb:
1) The
device keys as a prerequisite for any further action. The main MR key is the one residing in the tiny gz archive file which you install via the ;installHtml command in the special factory firmware; it's number one in the codelist mentioned above. This is needed to run all the MR tools (like especially the hotfix code, but of course, KUAL, too).
2) The
application keystore. This is a relatively large file (ca. 40 kb) which is part of the "hotfix" and resides in [userspace]/mkk/developer.keystore (in binary form - in the 7bit ASCII format as used above it would be much larger...). It gets installed via the hotfix installation process, contains (nearly) all public Java developer keys for all and any Kindle tools, hacks and apps. Even for such "exotic" ones like KindCalc (which is no longer maintained, only works with low res Kindles (600*800 screen, 167 dpi), but then it really does a good job).