we saw earlier, the key derivation function can be used to create
we saw ((("key generation", "HD (hierarchical deterministic)", "extended keys", id="keygen-hd-extend")))((("HD (hierarchical deterministic) key generation", "extended keys", id="hd-keygen-extend")))((("extended keys", id="extend-key")))earlier, the key derivation function can be used to create
children at any level of the tree, based on the three inputs: a key, a
chain code, and the index of the desired child. The two essential
ingredients are the key and chain code, and combined these are called an