Ok, I think it's clear. So, it's much better and more accurate to say compressed public key and uncompressed public key without the word "master" when there's only one private key.
I feel that the terms "master
" private
key" and
"master public key
" were poorly chosen, because they are not keys. The traditional "master key" is a key that can open a series of locks, and that is not what a "master private key"
or "master public key" does. I think more appropriate terms would be "private
key master" and
"public key master" because
they area "key master" is used to create
the keys, but it is too late for that now.