Is it possible to implement extended private/public keys? about ed25519-keygen

[paulmillr]

it may be possible

spec https://github.com/satoshilabs/slips/blob/master/slip-0010.md

[barthuijgen]

That page says this:

Public parent key → public child key
This function always fails for ed25519 since normal derivation is not supported.

I'm looking to be able to derive from the public extended key so this seems to me like it won't be possible for ed25519?

[paulmillr]

seems like it

[paulmillr]

FYI non-hardened keys are not secure in terms of privacy.