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73 lines
2.7 KiB
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73 lines
2.7 KiB
Plaintext
<pre>
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BIP: 81
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Title: Hierarchy for Colored Voting Pool Deterministic Multisig Wallets
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Author: Justus Ranvier <justus@opentransactions.org>
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Jimmy Song <jimmy@monetas.net>
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Status: Draft
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Type: Informational
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Created: 2014-08-11
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</pre>
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==Abstract==
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This BIP defines a logical hierarchy for colored coin voting pool deterministic multisig wallets based on an algorithm described in BIP-0032 (BIP32 from now on) and purpose scheme described in BIP-0043 (BIP43 from now on).
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This BIP is a particular application of BIP43 and is based on BIP44.
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==Motivation==
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The hierarchy proposed in this paper allows the handling of multiple color definitions from a single seed.
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==Path levels==
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We define the following 8 levels in BIP32 path:
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<pre>
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m / purpose' / series' / (5 color definition levels) / address_index
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</pre>
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Apostrophe in the path indicates that BIP32 hardened derivation is used.
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Each level has a special meaning, described in the chapters below.
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===Purpose===
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Purpose is a constant set following the BIP43 recommendation to: the ASCII value of "81" with the most signifigant bit set to indicate hardened derivation (0x80000051). It indicates that the subtree of this node is used according to this specification.
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Hardened derivation is used at this level.
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===Color Definition===
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Index values which can be applied to a BIP32 node are limited to 4 bytes (32 bits).
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Since this is not sufficient to identify color definitions without a risk of collision, multiple levels are used.
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Color definitions are first shortened to 20 bytes using the Bitcoin hash160 function.
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The resulting 20 bytes are split into five groups in little endian format, and where each group is used as the seed for the five levels of color definition levels
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Public derivation is used at these levels, even when the index exceeds 2^31.
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===Index===
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Public/private keypairs are numbered from index 0 in sequentially increasing manner. This number is used as child index in BIP32 derivation.
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Public keys obtained at this level of the heirarchy are used to construct multisig deposit scripts, using a schema that is shared between the members as an out-of-band contract.
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Public derivation is used at this level.
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==Compatible wallets==
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* [[https://github.com/btcsuite/btcwallet|btcwallet]] is the reference Bitcoin wallet for voting pools.
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==Copyright==
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This document is placed in the public domain.
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==Reference==
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* [[bip-0032.mediawiki|BIP32 - Hierarchical Deterministic Wallets]]
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* [[bip-0043.mediawiki|BIP43 - Purpose Field for Deterministic Wallets]]
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* [[bip-0044.mediawiki|BIP44 - Multi-Account Hierarchy for Deterministic Wallets]]
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* [[bip-0080.mediawiki|BIP80 - Hierarchy for Non-Colored Voting Pool Deterministic Multisig Wallets]]
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