add ecdsa derive signing logical #300
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Hi, quick security question on this PR. This looks like you're implementing additive non-hardened derivation for EdDSA (Child_Share = Parent_Share + delta). Isn't this vulnerable to the classic BIP32 parent key leakage attack? If a single Child_SK ever leaks (via t+1 collusion, etc.), an attacker can find the Parent_SK. SLIP-0010 specifically forbids this on ed25519 for this exact reason. How do you mitigate this risk? |
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