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From: Tom Zander <tomz@freedommail.ch>
To: bitcoin-dev@lists.linuxfoundation.org
Date: Fri, 14 Apr 2017 21:26:14 +0200
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Subject: Re: [bitcoin-dev] BIP proposal draft: BIP43 "purpose" allocation
for Ethereum
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Thinking about this a bit, I support this proposal for a BIP.
This is not Bitcoin, but address types are bound to meet in meat-space and
it would be good to have a central place where this is defined.
I would very much appreciate someone that worked on BIP32/BIP43 itself to
comment on the details.
Quoting bip 43;
"We encourage different schemes to apply for assigning a separate BIP
number and use the same number for purpose field, so addresses won't be
generated from overlapping BIP32 spaces."
On Wednesday, 12 April 2017 12:02:37 CEST Nick Johnson via bitcoin-dev
wrote:
> <pre>
> BIP: bip-nickjohnson-ethereum-purpose
> Layer: Applications
> Title: Ethereum purpose allocation for Deterministic Wallets
> Author: Nick Johnson <nick@ethereum.org>
> Status: Proposed
> Type: Standards Track
> Created: 2017-04-12
> </pre>
>
> ==Abstract==
>
> This BIP defines a logical hierarchy for deterministic wallets on the
> Ethereum blockchain 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.
>
> ==Motivation==
>
> Because Ethereum is based on account balances rather than UTXO, the
> hierarchy defined by BIP44 is poorly suited. As a result, several
> competing derivation path strategies have sprung up for deterministic
> wallets, resulting in inter-client incompatibility. This BIP seeks to
> provide a path to standardise this in a fashion better suited to
> Ethereum's unique requirements.
>
> ==Path levels==
>
> We define the following 2 levels in BIP32 path:
>
> <pre>
> m / purpose' / subpurpose' / *
> </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 to the hardened value of the BIP number assigned
> to this BIP (equivalently, the BIP number, bitwise ORed with 0x80000000)
> following the BIP43 recommendation.
> It indicates that the subtree of this node is used according to this
> specification.
>
> Hardened derivation is used at this level.
>
> ===Subpurpose===
> Subpurpose is set to the EIP number specifying the remainder of the BIP32
> derivation path. This permits new Ethereum-focused applications of
> deterministic wallets without needing to interface with the BIP process.
>
> Hardened derivation is used at this level.
>
> ==Reference== * [[bip-0032.mediawiki|BIP32 - Hierarchical Deterministic
> Wallets]] * [[bip-0043.mediawiki|BIP43 - Purpose Field for Deterministic
> Wallets]]
--
Tom Zander
Blog: https://zander.github.io
Vlog: https://vimeo.com/channels/tomscryptochannel
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