possible difference in key protocols, unknown.
documentation on local key protocols attached; @Telamon, please confirm documentation intact if able.
I have generated a key using your own protocols. Here is my signature of that newly-generated key with one of my usual keys. As far as you know, though, anyone editing our messages could just switch out the keys and signatures here and MitM us, so I'm not sure what, if any, security you attempt to derive from this. (No offense intended.)