-- | Returns the derivation index of this extended public key without the prime
-- bit set.
xPubChild :: XPubKey -> Word32
xPubChild k = clearBit (xPubIndex k) 31
xPubChild :: XPubKey -> Word32
xPubChild k = clearBit (xPubIndex k) 31
xPubChild k = clearBit (xPubIndex k) 31