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https://github.com/bitcoinbook/bitcoinbook
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Merge branch 'develop'
This commit is contained in:
Andreas M. Antonopoulos
commit
0d91a4e0cb
@ -548,7 +548,7 @@ The process of creating the master keys and master chain code for an HD wallet i
|
||||
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||||
[[HDWalletFromSeed]]
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||||
.Creating master keys and chain code from a root seed
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||||
image::images/HDWalletFromRootSeed.svg["HDWalletFromRootSeed"]
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image::images/HDWalletFromRootSeed.png["HDWalletFromRootSeed"]
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||||
The root seed is input into the HMAC-SHA512 algorithm and the resulting hash is used to create a _master private key_ (m) and a _master chain code_. The master private key (m) then generates a corresponding master public key (M), using the normal elliptic curve multiplication process +m * G+ that we saw previously in this chapter. The chain code is used to introduce entropy in the function that creates child keys from parent keys, as we will see in the next section.
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@ -570,7 +570,7 @@ The parent public key, chain code and the index number are combined and hashed w
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[[CKDpriv]]
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.Extending a parent private key to create a child private key
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image::images/ChildPrivateDerivation.svg["ChildPrivateDerivation"]
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image::images/ChildPrivateDerivation.png["ChildPrivateDerivation"]
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Changing the index allows us to extend the parent and create the other children in the sequence, e.g. Child 0, Child 1, Child 2 etc. Each parent key can have 2 billion children keys.
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@ -615,7 +615,7 @@ Another common application of this solution is for cold-storage or hardware wall
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[[CKDpub]]
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.Extending a parent public key to create a child public key
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image::images/ChildPublicDerivation.svg["ChildPublicDerivation"]
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image::images/ChildPublicDerivation.png["ChildPublicDerivation"]
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===== Hardened child key derivation
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@ -625,7 +625,7 @@ To counter this risk, HD wallets use an alternative derivation function called _
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[[CKDprime]]
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.Hardened derivation of a child key, omits the parent public key
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image::images/ChildHardPrivateDerivation.svg["ChildHardPrivateDerivation"]
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image::images/ChildHardPrivateDerivation.png["ChildHardPrivateDerivation"]
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When the hardened private derivation function is used, the resulting child private key and chain code are completely different from what would result from the normal derivation function. The resulting "branch" of keys can be used to produce extended public keys which are not vulnerable, since the chain code they contain cannot be exploited to reveal any private keys. Hardened derivation is therefore used to create a "gap" in the tree above the level where extended public keys are used.
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images/HDWalletFromRootSeed.png
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@ -1,135 +0,0 @@
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<title>extended</title>
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<text text-anchor="middle" x="354" y="-25.4" font-family="Sans" font-size="14.00"> </text>
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<text text-anchor="middle" x="354" y="-8.4" font-family="Sans" font-size="14.00">Normal Hierarchical Deterministic (HD) Key Derivation (BIP32)</text>
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<g id="node2" class="node"><title>parent_private_key</title>
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<text text-anchor="middle" x="205" y="-201.9" font-family="Sans" font-size="14.00">Parent Private Key</text>
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<text text-anchor="middle" x="509" y="-201.9" font-family="Sans" font-size="14.00">Child Private Key</text>
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<g id="edge15" class="edge"><title>parent_private_key->child_private_key</title>
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<g id="node3" class="node"><title>parent_chain_code</title>
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<text text-anchor="middle" x="205" y="-154.9" font-family="Sans" font-size="14.00">Parent Chain Code</text>
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<g id="edge21" class="edge"><title>parent_chain_code->hmac</title>
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<g id="node7" class="node"><title>child_public_key</title>
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<text text-anchor="middle" x="509" y="-107.9" font-family="Sans" font-size="14.00">Child Public Key</text>
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<g id="node11" class="node"><title>rel2</title>
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<text text-anchor="middle" x="653" y="-171.9" font-family="Sans" font-size="14.00">Derived</text>
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<text text-anchor="middle" x="653" y="-154.9" font-family="Sans" font-size="14.00">Mathematical</text>
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<text text-anchor="middle" x="653" y="-137.9" font-family="Sans" font-size="14.00">Relationship</text>
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<g id="node8" class="node"><title>i_norm</title>
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<text text-anchor="middle" x="205" y="-55.9" font-family="Sans" font-size="14.00">Index Number</text>
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</g>
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<!-- i_norm->hmac -->
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<g id="edge25" class="edge"><title>i_norm->hmac</title>
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<g id="edge29" class="edge"><title>hmac->child_private_key</title>
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<g id="edge31" class="edge"><title>hmac->child_chain_code</title>
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<g id="edge27" class="edge"><title>hmac->child_public_key</title>
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<!-- rel1 -->
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<g id="node10" class="node"><title>rel1</title>
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<text text-anchor="middle" x="55" y="-163.4" font-family="Sans" font-size="14.00">Mathematical</text>
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<text text-anchor="middle" x="55" y="-146.4" font-family="Sans" font-size="14.00">Relationship</text>
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<!-- rel1->parent_private_key -->
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<g id="edge3" class="edge"><title>rel1->parent_private_key</title>
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<g id="edge7" class="edge"><title>rel1->parent_public_key</title>
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@ -1,111 +0,0 @@
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<text text-anchor="middle" x="311" y="-8.4" font-family="Sans" font-size="14.00">Creation Of The Master Keys</text>
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<g id="graph2" class="cluster"><title>cluster_y</title>
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</g>
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<g id="graph3" class="cluster"><title>cluster_x</title>
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<text text-anchor="middle" x="48" y="-140.4" font-family="Sans" font-size="14.00">Or 512 Bits</text>
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<text text-anchor="middle" x="48" y="-106.4" font-family="Sans" font-size="14.00">(The Seed)</text>
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<text text-anchor="middle" x="231" y="-156.4" font-family="Sans" font-size="14.00">256 Bits</text>
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<g id="edge6" class="edge"><title>hmac->chain_code</title>
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<text text-anchor="middle" x="231" y="-127.4" font-family="Sans" font-size="14.00">256 Bits</text>
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<text text-anchor="middle" x="433" y="-149.4" font-family="Sans" font-size="14.00">Public Key</text>
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Before Width: | Height: | Size: 7.5 KiB |
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Reference in New Issue
Block a user