Question) Instructions to use the BIP32 child index

[Hoodie-Kang]

Hi,

I used the childIndex, which is defined in the child_test.go as "2147483648" , and I found that the index determines the pubkey, share and some other info. So I can figure out the meaning of the child index but can't find the instruction to use it, such as length, conditions, or something.

I would appreciate you to help me to know the instruction, references, or some examples! Thanks

[cychuang0924]

Hi Hoodie-Kang,

The meaning of the child index is defined in the BIP32.

If the index >= 2^31, then the derived key is hardened child key (i.e. coming from the parent private key).

If the index < 2^31, then the derived key is non-hardened child key (i.e. coming from the parent public key)..

[Hoodie-Kang]

Awesome, Thanks!