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drusselloctal@gmail.com 2014-11-01 10:59:33 -07:00
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@ -679,7 +679,7 @@ A child private key, the corresponding public key, and the bitcoin address are a
===== Extended keys
As we saw 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 _extended key_. The term "extended key" could also be thought of as "extensible key" because such a key can be used to derive children.
As we saw 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 _extended key_. The term "extended key" could also be thought of as "extensible key" because such a key can be used to derive children.
Extended keys are stored and represented simply as the concatenation of the 256-bit key and 256-bit chain code into a 512-bit sequence. There are two types of extended keys. An extended private key is the combination of a private key and chain code and can be used to derive child private keys (and from them, child public keys). An extended public key is a public key and chain code, which can be used to create child public keys, as described in <<public_key_derivation>>.