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70 lines
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70 lines
2.5 KiB
Plaintext
<pre>
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BIP: 43
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Layer: Applications
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Title: Purpose Field for Deterministic Wallets
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Author: Marek Palatinus <slush@satoshilabs.com>
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Pavol Rusnak <stick@satoshilabs.com>
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Comments-Summary: No comments yet.
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Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0043
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Status: Final
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Type: Standards Track
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Created: 2014-04-24
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</pre>
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==Abstract==
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This BIP introduces a "Purpose Field" for use in deterministic wallets
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based on algorithm described in BIP-0032 (BIP32 from now on).
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==Motivation==
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Although Hierarchical Deterministic Wallet structure as described by BIP32
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is an important step in user experience and security of the cryptocoin wallets,
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the BIP32 specification offers implementors too many degrees of freedom.
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Multiple implementations may claim they are BIP32 compatible, but in fact
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they can produce wallets with different logical structures making them
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non-interoperable. This situation unfortunately renders "BIP32 compatible"
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statement rather useless.
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==Purpose==
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We propose the first level of BIP32 tree structure to be used as "purpose".
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This purpose determines the further structure beneath this node.
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<pre>
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m / purpose' / *
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</pre>
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Apostrophe indicates that BIP32 hardened derivation is used.
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We encourage different schemes to apply for assigning a separate BIP number
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and use the same number for purpose field, so addresses won't be generated
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from overlapping BIP32 spaces.
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Purpose codes from 10001 to 19999 are reserved for [[https://github.com/satoshilabs/slips|SLIPs]].
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Example: Scheme described in BIP44 should use 44' (or 0x8000002C) as purpose.
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Note that m / 0' / * is already taken by BIP32 (default account), which
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preceded this BIP.
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Not all wallets may want to support the full range of features and possibilities
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described in these BIPs. Instead of choosing arbitrary subset of defined features
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and calling themselves BIPxx compatible, we suggest that software which needs
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only a limited structure should describe such structure in another BIP and use
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different "purpose" value.
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==Node serialization==
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Because this scheme can be used to generate nodes for more cryptocurrencies
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at once, or even something totally unrelated to cryptocurrencies, there's no
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point in using a special version magic described in section "Serialization
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format" of BIP32. We suggest to use always 0x0488B21E for public and 0x0488ADE4
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for private nodes (leading to prefixes "xpub" and "xprv" respectively).
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==Reference==
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* [[bip-0032.mediawiki|BIP32 - Hierarchical Deterministic Wallets]]
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