arno/bitcoinbook
1
0
Fork 0
mirror of https://github.com/bitcoinbook/bitcoinbook synced 2024-11-13 19:38:56 +00:00
Code Issues Releases Wiki Activity

Edited ch05.asciidoc with Atlas code editor

Browse Source
This commit is contained in:
nadams 2017-04-24 12:34:22 -07:00
parent 140283dc0d
commit f8f2734f6f
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
ch05.asciidoc
View File

@ -462,7 +462,7 @@ The "ancestry" of a key is read from right to left, until you reach the master k
((("BIP-43")))((("hierarchical deterministic wallets (HD wallets)","navigating")))((("hierarchical deterministic wallets (HD wallets)","tree structure for")))The HD wallet tree structure offers tremendous flexibility. Each parent extended key can have 4 billion children: 2 billion normal children and 2 billion hardened children. Each of those children can have another 4 billion children, and so on. The tree can be as deep as you want, with an infinite number of generations. With all that flexibility, however, it becomes quite difficult to navigate this infinite tree. It is especially difficult to transfer HD wallets between implementations, because the possibilities for internal organization into branches and subbranches are endless.
Two Bitcoin Improvement Proposals (BIPs) offer a solution to this complexity, by creating some proposed standards for the structure of HD wallet trees. BIP-43 proposes the use of the first hardened child index as a special identifier that signifies the "purpose" of the tree structure. Based on BIP-43, an HD wallet should use only one level-1 branch of the tree, with the index number identifying the structure and namespace of the rest of the tree by defining its purpose. For example, an HD wallet using only branch m/i′/ is intended to signify a specific purpose and that purpose is identified by index number "i".
Two Bitcoin Improvement Proposals (BIPs) offer a solution to this complexity, by creating some proposed standards for the structure of HD wallet trees. BIP-43 proposes the use of the first hardened child index as a special identifier that signifies the "purpose" of the tree structure. Based on BIP-43, an HD wallet should use only one level-1 branch of the tree, with the index number identifying the structure and namespace of the rest of the tree by defining its purpose. For example, an HD wallet using only branch m/i++'++/ is intended to signify a specific purpose and that purpose is identified by index number "i".
((("multiaccount structure")))Extending that specification, BIP-44 proposes a multiaccount structure as "purpose" number +44'+ under BIP-43. All HD wallets following the BIP-44 structure are identified by the fact that they only used one branch of the tree: m/44'/.