Typical path notation for a BIP44 child private key would be something like:
The public key is
Where point is the ECC multiply function. Is there any better notation than this? It would not be right to use
M/44'/0'/0' as this path is not derivable.
Is there any standard notation for the
xpub calculated from a hardened child private key?
(Note: I'm looking for notation that would be useful to parse and then re-derive this key, not necessarily the type of notation that would be intuitive in an academic paper.)