Quote from: o_e_l_e_o on August 01, 2020, 10:06:12 AM

Quote from: jackg on July 31, 2020, 11:28:55 PM

Hardened adrresses still have an extended public key it's just that it's harder (could be impossible) to find a private key given another private key of the wallet and the extended public key.

The parent extended public key is not used at all in the generation of hardened children. Hardened children are derived solely from the parent extended private key and the index. For this reason, it is indeed impossible to derive the private keys of hardened siblings by knowing a single private key and the parent extended public key.

is there any implementation that uses hardened keys?
all the paths i have seen with hardened paths use hardened indexes all the way to the child then the child key itself is regular. like BIP-44 where the path for each key is m/44'/0'/0'/0/0 m/44'/0'/0'/0/1,...