From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id EFE2D481 for ; Wed, 12 Apr 2017 10:02:49 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.7.6 Received: from mail-wm0-f52.google.com (mail-wm0-f52.google.com [74.125.82.52]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 29B9A156 for ; Wed, 12 Apr 2017 10:02:49 +0000 (UTC) Received: by mail-wm0-f52.google.com with SMTP id w64so83579003wma.0 for ; Wed, 12 Apr 2017 03:02:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ethereum.org; s=google; h=mime-version:from:date:message-id:subject:to; bh=cZEFLem494SOlPm3iGILG2Pa6t7aAPQnZH7+7oKsqhc=; b=R66c+8+Y1X3qgYY9BiHBStEKMA6Hu8wPrB7Qk3aK+faUqWjM0bNaCzkBM4ZoBi8ZHC QUcZNigijfWr97EdMPP6XELYLDUhEcdcNO+fO2NWCmqQM83Lj4pUNRbSAC+OCecR8hQ3 5oNUV8vdEoYL9GqI2pXD3m37DkXvoFQ1HuvWk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=cZEFLem494SOlPm3iGILG2Pa6t7aAPQnZH7+7oKsqhc=; b=DAJtVyAk3kcwJqLY0nrjm0/H8i7yP4PUamUp8FAo6QMyy8rDlHNq9r7lJKvcTK64Zl /6vAI4FskzuSwjnWjmFTAyLxMbcQrM6F5i/1y4ZbgAk0kDgezhcMdKgARx03PrF9lL/Y ukYRlbt08uika1eEwvFN4UiTTo8LXzez5BcEkzgdqGostb3Onop+Ok1JnUbTh3HHX/rn ltugRNgLFKq19Pr9CqEyx5+lGQwvXmXjo+WZvrMVrExGUtZvxgFKyoxPornS2VO35zxA HJQCBjLoTFABWi54ZqOl8mJjcwdhhZQ00xVVNkl0TfgBnnSdubqvuoV2q9NNIlIBnnVX I66w== X-Gm-Message-State: AN3rC/7PHCOYLE8G3MozqnJMlN2q+BKkcubqA0rZ9o9s+bf0veMUZvWr sYmjAew1CrsRuXRh/oebL/Vr/pzPROyM X-Received: by 10.28.153.140 with SMTP id b134mr18345828wme.124.1491991367595; Wed, 12 Apr 2017 03:02:47 -0700 (PDT) MIME-Version: 1.0 From: Nick Johnson Date: Wed, 12 Apr 2017 10:02:37 +0000 Message-ID: To: bitcoin-dev@lists.linuxfoundation.org Content-Type: multipart/alternative; boundary=001a114b2f2e79cd72054cf54f07 X-Spam-Status: No, score=-0.7 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HTML_MESSAGE, MPART_ALT_DIFF, RCVD_IN_DNSWL_NONE, RCVD_IN_SORBS_SPAM autolearn=no version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org X-Mailman-Approved-At: Wed, 12 Apr 2017 13:14:11 +0000 Subject: [bitcoin-dev] BIP proposal draft: BIP43 "purpose" allocation for Ethereum X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Protocol Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Apr 2017 10:02:50 -0000 --001a114b2f2e79cd72054cf54f07 Content-Type: text/plain; charset=UTF-8 
  BIP: bip-nickjohnson-ethereum-purpose
  Layer: Applications
  Title: Ethereum purpose allocation for Deterministic Wallets
  Author: Nick Johnson 
  Status: Proposed
  Type: Standards Track
  Created: 2017-04-12
==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: 
m / purpose' / subpurpose' / *
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]] --001a114b2f2e79cd72054cf54f07 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable 
<pre>
  BIP: bip-nickjohnson-ethereum-purpose
  Layer: Applications
  Title: Ethereum purpose allocation for Deterministic Wallets
  Author: Nick Johnson <nick@ethere=
um.org>
  Status: Proposed
  Type: Standards Track
  Created: 2017-04-12
</pre>

=3D=3DAbstract=3D=3D

This BIP defines a logical hierarchy for deterministic wallets on the Ether=
eum
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.

=3D=3DMotivation=3D=3D

Because Ethereum is based on account balances rather than UTXO, the hierarc=
hy
defined by BIP44 is poorly suited. As a result, several competing
derivation path strategies have sprung up for deterministic wallets, result=
ing
in inter-client incompatibility. This BIP seeks to provide a path to standa=
rdise
this in a fashion better suited to Ethereum's unique requirements.

=3D=3DPath levels=3D=3D

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.

=3D=3D=3DPurpose=3D=3D=3D

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) follo=
wing
the BIP43 recommendation.
It indicates that the subtree of this node is used according to this
specification.

Hardened derivation is used at this level.

=3D=3D=3DSubpurpose=3D=3D=3D
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.
=3D=3DRefe=
rence=3D=3D

* [[bip-0032.mediawiki|BIP32 - Hierarchical Deterministic Wallets]]
* [[bip-0043.mediawiki|BIP43 - Purpose Field for Deterministic Wallets]]

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