Given a derivation and a global xpub, return the unmasked path
that can be used to derive the child pubkey from the global xpub.
This is useful when you have a child xpub (e.g. a blinded xpub) derived
from a masked xpub and you need to generate the full, unmasked path.
Given a derivation and a global xpub, return the unmasked path that can be used to derive the child pubkey from the global xpub. This is useful when you have a child xpub (e.g. a blinded xpub) derived from a masked xpub and you need to generate the full, unmasked path.