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In-Reply-To: <0d405f5d-c0a4-bad7-b6c3-08ba4424bf17@satoshilabs.com>
References: <0d405f5d-c0a4-bad7-b6c3-08ba4424bf17@satoshilabs.com>
From: Kabuto Samourai <kabuto@samouraiwallet.com>
Date: Wed, 6 Sep 2017 22:52:57 -0500
Message-ID: <CA+_kfXLvTKwkuYmtt94OPUEPPwsEzhRoryy7srKMbLxYDxnmFA@mail.gmail.com>
To: Pavol Rusnak <stick@satoshilabs.com>, 
	Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Content-Type: multipart/alternative; boundary="001a114b16acc04121055891674a"
Subject: Re: [bitcoin-dev] Proposal: Extended serialization format for
	BIP-32 wallets
Precedence: list

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Thanks for the proposal. Aside from potential privacy implications of
revealing the derivation path for non BIP-44, 45, 49 HD nodes, this scheme
is superior to the alternate {x,y,z}pub idea. Since coin_type is part of
the path, the 'xpub' prefix may be shared across all coins if they so
choose. This format provides lock-in for BIP-49 going forward and opens the
door for a parallel native-SegWit BIP.

The birthday field is interesting. Could you provide some motivation for
its inclusion?

Could you also add some test vectors?

There are a few minor grammar / spelling errors, but we can nitpick those
after this goes to the pull request stage on bitcoin/bips.

On Wed, Sep 6, 2017 at 5:29 PM, Pavol Rusnak via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> The discussion about changing bip32 version bytes for SegWit got me
> thinking and I ended up with what I think is the best proposal:
>
> https://github.com/satoshilabs/slips/blob/master/slip-0032.md
>
> (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)
>
> Feel free to comment.
>
> --
> Best Regards / S pozdravom,
>
> Pavol "stick" Rusnak
> CTO, SatoshiLabs
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>


-Kabuto

PGP Fingerprint: 1A83 4A96 EDE7 E286 2C5A  B065 320F B934 A79B 6A99

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<div dir=3D"ltr">Thanks for the proposal. Aside from potential privacy impl=
ications of revealing the derivation path for non BIP-44, 45, 49 HD nodes, =
this scheme is superior to the alternate {x,y,z}pub idea. Since coin_type i=
s part of the path, the &#39;xpub&#39; prefix may be shared across all coin=
s if they so choose. This format provides lock-in for BIP-49 going forward =
and opens the door for a parallel native-SegWit BIP.<div><br></div><div>The=
 birthday field is interesting. Could you provide some motivation for its i=
nclusion?<br><div><br></div><div>Could you also add some test vectors?</div=
></div><div><br></div><div>There are a few minor grammar / spelling errors,=
 but we can nitpick those after this goes to the pull request stage on bitc=
oin/bips.</div><div><br></div><div class=3D"gmail_extra"><div class=3D"gmai=
l_quote">On Wed, Sep 6, 2017 at 5:29 PM, Pavol Rusnak via bitcoin-dev <span=
 dir=3D"ltr">&lt;<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" t=
arget=3D"_blank">bitcoin-dev@lists.linuxfoundation.org</a>&gt;</span> wrote=
:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex">The discussion about changing bip32 ver=
sion bytes for SegWit got me<br>
thinking and I ended up with what I think is the best proposal:<br>
<br>
<a href=3D"https://github.com/satoshilabs/slips/blob/master/slip-0032.md" r=
el=3D"noreferrer" target=3D"_blank">https://github.com/<wbr>satoshilabs/sli=
ps/blob/master/<wbr>slip-0032.md</a><br>
<br>
(It is hosted in SL repo for now, but if there is will, I would love to<br>
have this added to BIP repo as an extension to BIP32)<br>
<br>
Feel free to comment.<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
--<br>
Best Regards / S pozdravom,<br>
<br>
Pavol &quot;stick&quot; Rusnak<br>
CTO, SatoshiLabs<br>
______________________________<wbr>_________________<br>
bitcoin-dev mailing list<br>
<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org">bitcoin-dev@lists.=
<wbr>linuxfoundation.org</a><br>
<a href=3D"https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev" =
rel=3D"noreferrer" target=3D"_blank">https://lists.linuxfoundation.<wbr>org=
/mailman/listinfo/bitcoin-<wbr>dev</a><br>
</font></span></blockquote></div><br><br clear=3D"all"><div><br></div><div =
class=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"lt=
r"><div><div dir=3D"ltr">-Kabuto</div><div dir=3D"ltr"><br></div><div><font=
 size=3D"1">PGP Fingerprint:=C2=A01A83 4A96 EDE7 E286 2C5A =C2=A0B065 320F =
B934 A79B 6A99</font></div></div></div></div>
</div></div>

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