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+<pre>
+  BIP:     81
+  Title:   Hierarchy for Colored Voting Pool Deterministic Multisig Wallets
+  Authors: Justus Ranvier <justus@monetas.net>
+           Jimmy Song <jimmy@monetas.net>
+  Status:  Draft
+  Type:    Informational
+  Created: 2014-08-11
+</pre>
+
+==Abstract==
+
+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).
+
+This BIP is a particular application of BIP43 and is based on BIP44.
+
+==Motivation==
+
+The hierarchy proposed in this paper allows the handling of multiple color definitions from a single seed.
+
+==Path levels==
+
+We define the following 8 levels in BIP32 path:
+
+<pre>
+m / purpose' / series' / (5 color definition levels) / address_index
+</pre>
+
+Apostrophe in the path indicates that BIP32 hardened derivation is used.
+
+Each level has a special meaning, described in the chapters below.
+
+===Purpose===
+
+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.
+
+Hardened derivation is used at this level.
+
+===Color Definition===
+
+Index values which can be applied to a BIP32 node are limited to 4 bytes (32 bits).
+
+Since this is not sufficient to identify color definitions without a risk of collision, multiple levels are used.
+
+Color definitions are first shortened to 20 bytes using the Bitcoin hash160 function.
+
+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
+
+Public derivation is used at these levels, even when the index exceeds 2^31.
+
+===Index===
+
+Public/private keypairs are numbered from index 0 in sequentially increasing manner. This number is used as child index in BIP32 derivation.
+
+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.
+
+Public derivation is used at this level.
+
+==Compatible wallets==
+
+* [[https://github.com/conformal/btcd|btcd]] is the reference Bitcoin wallet for voting pools.
+
+==Reference==
+
+* [[bip-0032.mediawiki|BIP32 - Hierarchical Deterministic Wallets]]
+* [[bip-0043.mediawiki|BIP43 - Purpose Field for Deterministic Wallets]]
+* [[bip-0044.mediawiki|BIP44 - Multi-Account Hierarchy for Deterministic Wallets]]
+* [[bip-0080.mediawiki|BIP44 - Hierarchy for Non-Colored Voting Pool Deterministic Multisig Wallets]]