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drusselloctal@gmail.com 2014-11-01 10:58:59 -07:00
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@ -668,7 +668,7 @@ Repeating the process one level down the tree, each child can in turn become a p
===== Using derived child keys
Child private keys are indistinguishable from non-deterministic (random) keys. Because the derivation function is a one-way function, the child key cannot be used to find the parent key. The child key can also not be used to find any siblings. If you have the n~th~ child, you cannot find its siblings, such as the n–1 child or the n+1 child, or any other children that are part of the sequence. Only the parent key and chain code can derive all the children. Without the child chain code, the child key cannot be used to derive any grandchildren either. You need both the child private key and the child chain code to start a new branch and derive grandchildren.
Child private keys are indistinguishable from nondeterministic (random) keys. Because the derivation function is a one-way function, the child key cannot be used to find the parent key. The child key can also not be used to find any siblings. If you have the n~th~ child, you cannot find its siblings, such as the n–1 child or the n+1 child, or any other children that are part of the sequence. Only the parent key and chain code can derive all the children. Without the child chain code, the child key cannot be used to derive any grandchildren either. You need both the child private key and the child chain code to start a new branch and derive grandchildren.
So what can the child private key be used for on its own? It can be used to make a public key and a bitcoin address. Then, it can be used to sign transactions to spend anything paid to that address.