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70 lines
2.8 KiB
Markdown
70 lines
2.8 KiB
Markdown
<pre>
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DIP: 0009
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Title: Feature Derivation Paths
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Author(s): Samuel Westrich
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Special-Thanks:
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Status: Proposed
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Type: Informational
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Created: 2019-03-12
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License: MIT License
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</pre>
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## Table of Contents
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1. [Abstract](#abstract)
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1. [Motivation](#motivation)
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1. [Prior Work](#prior-work)
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1. [Feature Path Level](#feature-path-level)
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1. [Copyright](#copyright)
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## Abstract
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This DIP introduces reliable derivation paths for various coin-specific features.
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## Motivation
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Currently there is much ambiguity between different coin paths, BIP43 tried to solve this with the ‘purpose’ hardened derivation. With BIP44 we saw derivation paths such as `44’/5’/0’` which addresses coin-specific derivation paths. However, these derivation paths had an account directly after the coin type which made it unusable for coin-specific features other than standard transactions.
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## Prior work
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- [BIP-0043 - Purpose Field for Deterministic Wallets](https://github.com/bitcoin/bips/blob/master/bip-0043.mediawiki)
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- [BIP-0044 - Multi-Account Hierarchy for Deterministic Wallets](https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki)
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## Feature path level
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We define the following minimum 3 levels in BIP32 path:
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`m / purpose' / coin_type' / feature' / *`
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An apostrophe in the path indicates that BIP32 hardened derivation is used.
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Each level has a special meaning, described in the sections below.
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### Purpose
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Purpose is a constant set to `9'` (or 0x80000009) following the [BIP43 recommendation](https://github.com/bitcoin/bips/blob/master/bip-0043.mediawiki#purpose). 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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### Coin type
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Coin type in this DIP is the same as defined by [BIP44](https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki#coin-type) (a constant, set for each cryptocoin). For example, Dash has a registered coin type of `5'` (or 0x80000005).
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This DIP is not a central directory for the registered coin types. Please visit the full list of registered coin types maintained by SatoshiLabs for any other coins:
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[SLIP-0044 : Registered coin types for BIP-0044](https://github.com/satoshilabs/slips/blob/master/slip-0044.md)
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Hardened derivation is used at this level.
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### Feature
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This level splits the coin’s key space based on coin-specific features. For example, it may be desirable to maintain mixed funds in a path that is isolated from non-mixed funds. Other use cases could include using a specific path for identity or other non-financial keys.
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Hardened derivation is used at this level.
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Feature derivation paths may be defined based on future DIPs. A list of registered features can be found [here](dip-0009/assignments.md).
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## Copyright
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Copyright (c) 2019 Dash Core Group, Inc. [Licensed under the MIT License](https://opensource.org/licenses/MIT)
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