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 2C89EB12 for ; Thu, 7 Sep 2017 16:47:24 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from bitcoin.jonasschnelli.ch (bitcoinsrv.jonasschnelli.ch [138.201.55.219]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id 3BEB41E2 for ; Thu, 7 Sep 2017 16:47:23 +0000 (UTC) Received: by bitcoin.jonasschnelli.ch (Postfix, from userid 1002) id 2781315E4806; Thu, 7 Sep 2017 18:47:22 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org X-Spam-Level: X-Spam-Status: No, score=-0.0 required=5.0 tests=RP_MATCHES_RCVD autolearn=disabled version=3.3.1 Received: from [10.0.1.66] (199-241-203-51.PUBLIC.monkeybrains.net [199.241.203.51]) by bitcoin.jonasschnelli.ch (Postfix) with ESMTPSA id 58D1E15E4804; Thu, 7 Sep 2017 18:47:21 +0200 (CEST) From: Jonas Schnelli Content-Type: multipart/signed; boundary="Apple-Mail=_BF4753AD-8747-47E4-9292-418FF2C99571"; protocol="application/pgp-signature"; micalg=pgp-sha256 Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Date: Thu, 7 Sep 2017 09:47:16 -0700 References: <0d405f5d-c0a4-bad7-b6c3-08ba4424bf17@satoshilabs.com> To: Pavol Rusnak , Bitcoin Protocol Discussion In-Reply-To: <0d405f5d-c0a4-bad7-b6c3-08ba4424bf17@satoshilabs.com> Message-Id: X-Mailer: Apple Mail (2.3273) X-Virus-Scanned: clamav-milter 0.99.2 at bitcoinsrv.jonasschnelli.ch X-Virus-Status: Clean Subject: Re: [bitcoin-dev] Proposal: Extended serialization format for BIP-32 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: Thu, 07 Sep 2017 16:47:24 -0000 --Apple-Mail=_BF4753AD-8747-47E4-9292-418FF2C99571 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Thanks for the proposal. Three points it could see as possible improvements: 1. =46rom what I know, the exact birthday in seconds doesn=E2=80=99t matter = that much therefore it may be possible to just use 13 or 16bits to = create a representation in week from 2009-01-09 00:00 UTC. 13bits would = give you 157 years. Always round down to the beginning of the week when the key was created. But not sure if it=E2=80=99s worth to save ~two bytes for that. Also not sure if the key-birthday in seconds could have a security or = privacy implication (week maybe better). 2. Would it make sense to have special depth bytes that directly implies = it=E2=80=99s a BIP44 master key (and therefore avoid the bip32 path = serialisation)? I know some =E2=80=9Ecentralised=E2=80=9C table need to = be available for that which may be not a good idea. But maybe the BIP = could reserve a couple of depth-bytes (maybe 0xF0 to 0xFF) for = predefined paths. 3. Would adding a version bit make sense to allow future extensions? /jonas > Am 06.09.2017 um 15:29 schrieb Pavol Rusnak via bitcoin-dev = : >=20 > The discussion about changing bip32 version bytes for SegWit got me > thinking and I ended up with what I think is the best proposal: >=20 > https://github.com/satoshilabs/slips/blob/master/slip-0032.md >=20 > (It is hosted in SL repo for now, but if there is will, I would love = to > have this added to BIP repo as an extension to BIP32) >=20 > Feel free to comment. >=20 > -- > Best Regards / S pozdravom, >=20 > Pavol "stick" Rusnak > CTO, SatoshiLabs > _______________________________________________ > bitcoin-dev mailing list > bitcoin-dev@lists.linuxfoundation.org > https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev --Apple-Mail=_BF4753AD-8747-47E4-9292-418FF2C99571 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEyhopCNzi8TB0xizeHrd2uwPHki0FAlmxeBQACgkQHrd2uwPH ki0VQhAA1DD2tKCCPlsIH0Z+gGDwKkFTeoSDLDjAKU4KLvK4DLlU6/wowrGYHC72 VbneJlLVjjKgJRDpDn1c2LDe1ifl3NC6oDUo+PcPyLQTJmOLlokLisb+BkZVTOZg B6wjE3767w3wJlK3LGyA99KRzwMobacInZSN4VgN67OFsQhmdrIx/5kcD2ssJse6 kXaRbDlCDsBw3jyK87D96966S4kaAUKQ9tRZJqOg5BFgYBTCzlgH2xVBwte9Jvq6 pbOxCRxYmAXXK2xmIq1m72Dsc6AipHTybTkafIc4nSKGUgWlDLYswLr8PEd1sJw1 Af9u3oRnFSMjKogDJj0lZPFqEGlKVP6/GKcbn0h4XcZei8+Q1lrt4lvA8KvpbbfF cDTwHxDug5bhC4TAFD8JylNdUYxDAWrJO5avjuiLOU3AqS2iUgSL4CXjzPtJlmfe cagCXFW9asc337EMOqA4cR1s0+kW2Hdjo8R7u7LStl70niuqLIJGYt+606+DtQDD 3qbnG1FWZm1pYHpHbwvRQm84v9q9PEcn2cYJhbIYlR0bg2eufxjz941VViY216u8 /o+QheFI4mhJT/sqkAyfLMv2yXHer0/ZifSNdLk0flTzeAwIy96KwZhlfJxuI4tH nuLjyvBf28+PlQP9AFtHaqIc8P/k758XTRLuf10FyiH9z71Jy7g= =i85G -----END PGP SIGNATURE----- --Apple-Mail=_BF4753AD-8747-47E4-9292-418FF2C99571--