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Date: Fri, 16 Jan 2015 16:34:17 +0000
From: Thomas Kerin <me@thomaskerin.io>
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Subject: Re: [Bitcoin-development] convention/standard for sorting public
 keys for p2sh multisig transactions
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Hash: SHA512

It would - it assumes you have the set of keys and are sorting before
you derive and send funds to such a P2SH address.

It seems there is scope for further narrowing down how a multisig
scripthash address should be determined - what do people think of
anticipating only compressed keys for scripts?

It's possible to cause confusion if one put forward a compressed key at
some time, and an uncompressed key at another. A different script hash
would be produced even though there is no difference to the keys
involved. The client will not search for this.


Having spoken with Jean-Pierre and Ruben about this for quite some time
now, there is 100% the need for a BIP outlining this. Everyone has had
the idea at some point, and some of us already using it, but people
shouldn't have to go digging in BIP45 for the two lines which mention
it. All we need is a place to put the docs.

I am building up a list of implementations which currently support
sorting, and briefly describing a motivation for such a BIP.


On 16/01/15 10:16, Ruben de Vries wrote:
> Since we only need the sorting for creating the scriptPubKey,
> wouldn't it make the most sense to sort it by the way it represented
in that context?
>
>
> On Thu, Jan 15, 2015 at 2:03 PM, Wladimir <laanwj@gmail.com
<mailto:laanwj@gmail.com>> wrote:
>
>     On Thu, Jan 15, 2015 at 1:17 AM, Matt Whitlock
<bip@mattwhitlock.name <mailto:bip@mattwhitlock.name>> wrote:
>     > On Wednesday, 14 January 2015, at 3:53 pm, Eric Lombrozo wrote:
>     >> Internally, pubkeys are DER-encoded integers.
>     >
>     > I thought pubkeys were represented as raw integers (i.e.,
they're embedded in Script as a push operation whose payload is the raw
bytes of the big-endian representation of the integer). As far as I
know, DER encoding is only used for signatures. Am I mistaken?
>
>     OP_CHECKSIG (and OP_CHECKSIGVERIFY) takes a DER-encoded pubkey and =
a
>     DER-encoded signature on the stack.
>
>     Possibly you're confused with OP_HASH160 <hash160> OP_EQUALVERIFY a=
s
>     used in outputs, which compares the 160-bit hash of the pubkey agai=
nst
>     the given hash (usually taken from a bitcoin address).
>
>     It doesn't help understanding to consider either as integers. They =
are
>     binary blob objects with either a fixed format (DER) or a fixed siz=
e
>     (hashes).
>
>     Wladimir
>
>
>
>
> --
> BlockTrail B.V.
> Barbara Strozzilaan 201
> 1083HN Amsterdam
> The Netherlands
>
> Phone:+31 (0)612227277
> E-mail:ruben@blocktrail.com <mailto:ruben@blocktrail.com>
> Web:www.blocktrail.com
> <http://www.blocktrail.com/>
> Github:www.github.com/rubensayshi <http://www.github.com/rubensayshi>
>
> BlockTrail B.V. Is registered with the Dutch Chamber of Commerce in
Amsterdam with registration No.:60262060 and VAT No.:NL853833035B01
>
>
>
-------------------------------------------------------------------------=
-----
> New Year. New Location. New Benefits. New Data Center in Ashburn, VA.
> GigeNET is offering a free month of service with a new server in Ashbur=
n.
> Choose from 2 high performing configs, both with 100TB of bandwidth.
> Higher redundancy.Lower latency.Increased capacity.Completely compliant=
=2E
> http://p.sf.net/sfu/gigenet
>
>
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development

- --=20
Thomas Kerin
- -------------------------

My PGP key can be found here
<http://pgp.mit.edu/pks/lookup?op=3Dget&search=3D0x3F0D2F83A2966155>
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    <br>
    -----BEGIN PGP SIGNED MESSAGE-----<br>
    Hash: SHA512<br>
    <br>
    It would - it assumes you have the set of keys and are sorting
    before you derive and send funds to such a P2SH address.<br>
    <br>
    It seems there is scope for further narrowing down how a multisig
    scripthash address should be determined - what do people think of
    anticipating only compressed keys for scripts?<br>
    <br>
    It's possible to cause confusion if one put forward a compressed key
    at some time, and an uncompressed key at another. A different script
    hash would be produced even though there is no difference to the
    keys involved. The client will not search for this.<br>
    <br>
    <br>
    Having spoken with Jean-Pierre and Ruben about this for quite some
    time now, there is 100% the need for a BIP outlining this. Everyone
    has had the idea at some point, and some of us already using it, but
    people shouldn't have to go digging in BIP45 for the two lines which
    mention it. All we need is a place to put the docs.<br>
    <br>
    I am building up a list of implementations which currently support
    sorting, and briefly describing a motivation for such a BIP.<br>
    <br>
    <br>
    On 16/01/15 10:16, Ruben de Vries wrote:<br>
    <span style=3D"white-space: pre;">&gt; Since we only need the sorting
      for creating the scriptPubKey, <br>
      &gt; wouldn't it make the most sense to sort it by the way it
      represented in that context?<br>
      &gt;<br>
      &gt;<br>
      &gt; On Thu, Jan 15, 2015 at 2:03 PM, Wladimir
      &lt;<a class=3D"moz-txt-link-abbreviated" href=3D"mailto:laanwj@gma=
il.com">laanwj@gmail.com</a> <a class=3D"moz-txt-link-rfc2396E" href=3D"m=
ailto:laanwj@gmail.com">&lt;mailto:laanwj@gmail.com&gt;</a>&gt; wrote:<br=
>
      &gt;<br>
      &gt;=A0=A0=A0=A0 On Thu, Jan 15, 2015 at 1:17 AM, Matt Whitlock
      &lt;<a class=3D"moz-txt-link-abbreviated" href=3D"mailto:bip@mattwh=
itlock.name">bip@mattwhitlock.name</a> <a class=3D"moz-txt-link-rfc2396E"=
 href=3D"mailto:bip@mattwhitlock.name">&lt;mailto:bip@mattwhitlock.name&g=
t;</a>&gt;
      wrote:<br>
      &gt;=A0=A0=A0=A0 &gt; On Wednesday, 14 January 2015, at 3:53 pm, Er=
ic
      Lombrozo wrote:<br>
      &gt;=A0=A0=A0=A0 &gt;&gt; Internally, pubkeys are DER-encoded integ=
ers.<br>
      &gt;=A0=A0=A0=A0 &gt;<br>
      &gt;=A0=A0=A0=A0 &gt; I thought pubkeys were represented as raw int=
egers
      (i.e., they're embedded in Script as a push operation whose
      payload is the raw bytes of the big-endian representation of the
      integer). As far as I know, DER encoding is only used for
      signatures. Am I mistaken?<br>
      &gt;<br>
      &gt;=A0=A0=A0=A0 OP_CHECKSIG (and OP_CHECKSIGVERIFY) takes a DER-en=
coded
      pubkey and a<br>
      &gt;=A0=A0=A0=A0 DER-encoded signature on the stack.<br>
      &gt;<br>
      &gt;=A0=A0=A0=A0 Possibly you're confused with OP_HASH160 &lt;hash1=
60&gt;
      OP_EQUALVERIFY as<br>
      &gt;=A0=A0=A0=A0 used in outputs, which compares the 160-bit hash o=
f the
      pubkey against<br>
      &gt;=A0=A0=A0=A0 the given hash (usually taken from a bitcoin addre=
ss).<br>
      &gt;<br>
      &gt;=A0=A0=A0=A0 It doesn't help understanding to consider either a=
s
      integers. They are<br>
      &gt;=A0=A0=A0=A0 binary blob objects with either a fixed format (DE=
R) or a
      fixed size<br>
      &gt;=A0=A0=A0=A0 (hashes).<br>
      &gt;<br>
      &gt;=A0=A0=A0=A0 Wladimir<br>
      &gt;<br>
      &gt;<br>
      &gt;<br>
      &gt;<br>
      &gt; -- <br>
      &gt; BlockTrail B.V.<br>
      &gt; Barbara Strozzilaan 201<br>
      &gt; 1083HN Amsterdam<br>
      &gt; The Netherlands<br>
      &gt;<br>
      &gt; Phone:+31 (0)612227277<br>
      &gt; <a class=3D"moz-txt-link-abbreviated" href=3D"mailto:E-mail:ru=
ben@blocktrail.com">E-mail:ruben@blocktrail.com</a>
      <a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:ruben@blocktrail.=
com">&lt;mailto:ruben@blocktrail.com&gt;</a><br>
      &gt; Web:www.blocktrail.com<br>
      &gt; <a class=3D"moz-txt-link-rfc2396E" href=3D"http://www.blocktra=
il.com/">&lt;http://www.blocktrail.com/&gt;</a><br>
      &gt; Github:www.github.com/rubensayshi
      <a class=3D"moz-txt-link-rfc2396E" href=3D"http://www.github.com/ru=
bensayshi">&lt;http://www.github.com/rubensayshi&gt;</a><br>
      &gt;<br>
      &gt; BlockTrail B.V. Is registered with the Dutch Chamber of
      Commerce in Amsterdam with registration No.:60262060 and VAT
      No.:NL853833035B01<br>
      &gt;<br>
      &gt;<br>
      &gt;
-------------------------------------------------------------------------=
-----<br>
      &gt; New Year. New Location. New Benefits. New Data Center in
      Ashburn, VA.<br>
      &gt; GigeNET is offering a free month of service with a new server
      in Ashburn.<br>
      &gt; Choose from 2 high performing configs, both with 100TB of
      bandwidth.<br>
      &gt; Higher redundancy.Lower latency.Increased capacity.Completely
      compliant.<br>
      &gt; <a class=3D"moz-txt-link-freetext" href=3D"http://p.sf.net/sfu=
/gigenet">http://p.sf.net/sfu/gigenet</a><br>
      &gt;<br>
      &gt;<br>
      &gt; _______________________________________________<br>
      &gt; Bitcoin-development mailing list<br>
      &gt; <a class=3D"moz-txt-link-abbreviated" href=3D"mailto:Bitcoin-d=
evelopment@lists.sourceforge.net">Bitcoin-development@lists.sourceforge.n=
et</a><br>
      &gt;
      <a class=3D"moz-txt-link-freetext" href=3D"https://lists.sourceforg=
e.net/lists/listinfo/bitcoin-development">https://lists.sourceforge.net/l=
ists/listinfo/bitcoin-development</a></span><br>
    <br>
    - -- <br>
    Thomas Kerin<br>
    - -------------------------<br>
    <br>
    My PGP key can be found here
<a class=3D"moz-txt-link-rfc2396E" href=3D"http://pgp.mit.edu/pks/lookup?=
op=3Dget&amp;search=3D0x3F0D2F83A2966155">&lt;http://pgp.mit.edu/pks/look=
up?op=3Dget&amp;search=3D0x3F0D2F83A2966155&gt;</a><br>
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