Does a CP passphrase have a “Master Public Key”?
A “Master Public Key” is simply a key all the addresses can be derived from without exposing the passphrase or private keys.
Electrum has this feature, and it also uses a 12 word passphrase/seed
Short answer is No. Then encoding scheme uses “hard” keys.
Too bad. No MPK support isn’t that big a deal, but it would be nice if Electrum and Counterwallet passphrases were compatible.
its possible though to fork counterwallet and just change the key encodings. It would only require a “1” character change in the code, if I recall correctly.
The risk though was that if you had the PrivateKeys of some of the subsequent addresses belonging to the same master key it would be possible to derive the other private keys…