Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id EB8CD486 for ; Fri, 21 Jul 2017 13:58:54 +0000 (UTC) X-Greylist: delayed 00:40:06 by SQLgrey-1.7.6 Received: from 16.mo6.mail-out.ovh.net (16.mo6.mail-out.ovh.net [87.98.139.208]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 13D7416B for ; Fri, 21 Jul 2017 13:58:53 +0000 (UTC) Received: from player774.ha.ovh.net (b6.ovh.net [213.186.33.56]) by mo6.mail-out.ovh.net (Postfix) with ESMTP id C97C6FD47C for ; Fri, 21 Jul 2017 14:39:23 +0200 (CEST) Received: from localhost.localdomain (host102-98-static.3-79-b.business.telecomitalia.it [79.3.98.102]) (Authenticated sender: simone.bronzini@chainside.net) by player774.ha.ovh.net (Postfix) with ESMTPSA id 95AB240081 for ; Fri, 21 Jul 2017 14:39:23 +0200 (CEST) To: Bitcoin Protocol Discussion From: Simone Bronzini Message-ID: <5464f0d4-f1d3-d656-6162-ae6a66607265@chainside.net> Date: Fri, 21 Jul 2017 14:39:22 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="6IoNP149BgbxjnMjuKamMR4HWv3aK3KHC" X-Ovh-Tracer-Id: 17724760761617195342 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: 0 X-VR-SPAMCAUSE: X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org X-Mailman-Approved-At: Fri, 21 Jul 2017 14:36:06 +0000 Subject: [bitcoin-dev] BIP proposal - multi-account key derivation hierarchy for multisig wallets 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: Fri, 21 Jul 2017 13:58:55 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --6IoNP149BgbxjnMjuKamMR4HWv3aK3KHC Content-Type: multipart/mixed; boundary="OgOtVf2q3KafniAxONLlGPLEAIslBmaaQ"; protected-headers="v1" From: Simone Bronzini To: Bitcoin Protocol Discussion Message-ID: <5464f0d4-f1d3-d656-6162-ae6a66607265@chainside.net> Subject: BIP proposal - multi-account key derivation hierarchy for multisig wallets --OgOtVf2q3KafniAxONLlGPLEAIslBmaaQ Content-Type: multipart/mixed; boundary="------------68228B9B98B4DFA621EBE247" Content-Language: en-US This is a multi-part message in MIME format. --------------68228B9B98B4DFA621EBE247 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Maybe this has already been discussed, but I have not found anything onli= ne. To the best of my knowledge, the only BIP which specifies a HD structure for multisig wallets is BIP45. Unfortunately, when used in a multi-account fashion, BIP45 gets very tricky very fast. In fact, one has to either use a new master for every multisig account (hence having to backup many master private keys) or use the same master for many multisig accounts, resulting in deterministic but complex and undesirable key reuse. I would like to propose a new structure for multi-account multisig wallets. This structure follows the derivation scheme of other proposals (in particular BIP44 and BIP49) but adds a level to take into account multisig accounts separation. In particular, the structure should be as follows: m/purpose'/coin_type'/account'/cosigner_index/change/address_index In this case, a user can create many multisig accounts (each one will be a different account number) and give his/her account's public derivation to the cosigners. From this point on, the creation of a multisig P2SH address will follow the same procedure as described in BIP45, with each cosigner selecting his branch from the other cosigners' trees. Would this proposal be acceptable as a BIP? 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