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12:02 < jesseposner> Has anyone considered how BIP32 might be used for non-interactive nonce generation in multi-party protocols such as MuSig and FROST? If all the parties exchange "nonce xpubs" during key generation, would it be safe for them to derive nonces from the extended keys using deterministic parameters? For example, a nonce key could be derived as a standard non-hardened key with the exception that it would also append the message being 
12:02 < jesseposner> signed to the HMAC input used for key derivation, which results in a non-interactive deterministic nonce for each combination of a party and a message.
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12:27 < jesseposner> I don't think this works because you would reuse the base nonce scalar and you can subtract the tweak which would be public.
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14:05 < andytoshi> yep
14:05 < andytoshi> it seems like anything resembling non-hardended derivation is a no-go
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