[Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Ruben de Vries]

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For p2sh multisig TXs the order of the public keys affect the hash and
there doesn't seem to be an agreed upon way of sorting the public keys.

If there would be a standard (recommended) way of sorting the public keys
that would make it easier for services that implement some form of multisig
to be compatible with each other without much hassle and making it possible
to import keys from one service to another.

I'm not suggesting forcing the order, just setting a standard to recommend,
there doesn't seem to be much reason for (new) services to not follow that
recommendation.

Ryan from BitPay broad this up before (
https://sourceforge.net/p/bitcoin/mailman/message/32092958/) and in bitcore
they've implemented lexicographical sorting on the hex of the public key.
In a short search I can't find any other library that has a sorting
function, let alone using it by default, so bitcore is currently my only
reference.


​Ruben de Vries
​CTO, BlockTrail

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Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[devrandom]

At CryptoCorp we recommend to our customers that they sort
lexicographically by the public key bytes of the leaf public keys.  i.e.
the same as BitPay.

On Wed, 2015-01-14 at 17:37 +0100, Ruben de Vries wrote:
> For p2sh multisig TXs the order of the public keys affect the hash and
> there doesn't seem to be an agreed upon way of sorting the public
> keys.
> 
> 
> If there would be a standard (recommended) way of sorting the public
> keys that would make it easier for services that implement some form
> of multisig to be compatible with each other without much hassle and
> making it possible to import keys from one service to another.
> 
> 
> I'm not suggesting forcing the order, just setting a standard to
> recommend, there doesn't seem to be much reason for (new) services to
> not follow that recommendation.
> 
> 
> Ryan from BitPay broad this up before
> (https://sourceforge.net/p/bitcoin/mailman/message/32092958/) and in
> bitcore they've implemented lexicographical sorting on the hex of the
> public key.
> In a short search I can't find any other library that has a sorting
> function, let alone using it by default, so bitcore is currently my
> only reference.
> 
> 
> 
> 
> ​Ruben de Vries
> ​CTO, BlockTrail
> ------------------------------------------------------------------------------
> 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 Ashburn.
> Choose from 2 high performing configs, both with 100TB of bandwidth.
> Higher redundancy.Lower latency.Increased capacity.Completely compliant.
> http://p.sf.net/sfu/gigenet
> _______________________________________________ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development

-- 
Miron / devrandom

Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Eric Lombrozo]

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I think everyone is pretty much following this standard now.

- Eric
On Jan 14, 2015 12:58 PM, "devrandom" <c1.sf-bitcoin@niftybox.net> wrote:

> At CryptoCorp we recommend to our customers that they sort
> lexicographically by the public key bytes of the leaf public keys.  i.e.
> the same as BitPay.
>
> On Wed, 2015-01-14 at 17:37 +0100, Ruben de Vries wrote:
> > For p2sh multisig TXs the order of the public keys affect the hash and
> > there doesn't seem to be an agreed upon way of sorting the public
> > keys.
> >
> >
> > If there would be a standard (recommended) way of sorting the public
> > keys that would make it easier for services that implement some form
> > of multisig to be compatible with each other without much hassle and
> > making it possible to import keys from one service to another.
> >
> >
> > I'm not suggesting forcing the order, just setting a standard to
> > recommend, there doesn't seem to be much reason for (new) services to
> > not follow that recommendation.
> >
> >
> > Ryan from BitPay broad this up before
> > (https://sourceforge.net/p/bitcoin/mailman/message/32092958/) and in
> > bitcore they've implemented lexicographical sorting on the hex of the
> > public key.
> > In a short search I can't find any other library that has a sorting
> > function, let alone using it by default, so bitcore is currently my
> > only reference.
> >
> >
> >
> >
> > ​Ruben de Vries
> > ​CTO, BlockTrail
> >
> ------------------------------------------------------------------------------
> > 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 Ashburn.
> > Choose from 2 high performing configs, both with 100TB of bandwidth.
> > Higher redundancy.Lower latency.Increased capacity.Completely compliant.
> > http://p.sf.net/sfu/gigenet
> > _______________________________________________ Bitcoin-development
> mailing list Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
> --
> Miron / devrandom
>
>
>
>
>
> ------------------------------------------------------------------------------
> 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 Ashburn.
> Choose from 2 high performing configs, both with 100TB of bandwidth.
> Higher redundancy.Lower latency.Increased capacity.Completely compliant.
> http://p.sf.net/sfu/gigenet
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>

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Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Jean-Pierre Rupp]

We in Haskoin do the same.

On 14/01/15 17:39, devrandom wrote:
> At CryptoCorp we recommend to our customers that they sort
> lexicographically by the public key bytes of the leaf public keys.  i.e.
> the same as BitPay.

-- 
Be Happy :)

Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Jeffrey Paul]

> On 20150114, at 09:39, devrandom <c1.sf-bitcoin@niftybox.net> wrote:
> 
> At CryptoCorp we recommend to our customers that they sort
> lexicographically by the public key bytes of the leaf public keys.  i.e.
> the same as BitPay.

To clarify: the raw bytes of the public key itself, not the ascii base58 representation of the pubkey hash - right?

-jp

--
Jeffrey Paul                                                      EEQJ
jp@eeqj.com                                           https://eeqj.com
+1-800-403-1126 (America)                  +1-312-361-0355 (Worldwide)
5539 AD00 DE4C 42F3 AFE1                      1575 0524 43F4 DF2A 55C2

Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Pavol Rusnak]

On 14/01/15 20:27, Jeffrey Paul wrote:
> To clarify: the raw bytes of the public key itself, not the ascii base58 representation of the pubkey hash - right?

Could you give an example of two pubkeys where the following condition
is met?

raw(pubkey1) > raw(pubkey2) and base58(pubkey1) < base58(pubkey2)

-- 
Best Regards / S pozdravom,

Pavol Rusnak <stick@gk2.sk>

Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Eric Lombrozo]

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I would highly recommend NOT using Base58 for anything except stuff that is
to be copy/pasted by the enduser.

Internally, pubkeys are DER-encoded integers.

- Eric
On Jan 14, 2015 2:54 PM, "Jeffrey Paul" <jp@eeqj.com> wrote:

>
> > On 20150114, at 09:39, devrandom <c1.sf-bitcoin@niftybox.net> wrote:
> >
> > At CryptoCorp we recommend to our customers that they sort
> > lexicographically by the public key bytes of the leaf public keys.  i.e.
> > the same as BitPay.
>
> To clarify: the raw bytes of the public key itself, not the ascii base58
> representation of the pubkey hash - right?
>
> -jp
>
> --
> Jeffrey Paul                                                      EEQJ
> jp@eeqj.com                                           https://eeqj.com
> +1-800-403-1126 (America)                  +1-312-361-0355 (Worldwide)
> 5539 AD00 DE4C 42F3 AFE1                      1575 0524 43F4 DF2A 55C2
>
>
>
> ------------------------------------------------------------------------------
> 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 Ashburn.
> Choose from 2 high performing configs, both with 100TB of bandwidth.
> Higher redundancy.Lower latency.Increased capacity.Completely compliant.
> http://p.sf.net/sfu/gigenet
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>

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Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Eric Lombrozo]

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Ciphrex was using this convention well before BitPay...and BitPay's BIP32
implementation was at least partly taken from ours.

- Eric
On Jan 14, 2015 8:03 PM, "Andy Alness" <andy@coinbase.com> wrote:

> Doing same (BitPay convention) for our multisig support.
>
> On Wed, Jan 14, 2015 at 3:53 PM, Eric Lombrozo <elombrozo@gmail.com>
> wrote:
> > I would highly recommend NOT using Base58 for anything except stuff that
> is
> > to be copy/pasted by the enduser.
> >
> > Internally, pubkeys are DER-encoded integers.
> >
> > - Eric
> >
> > On Jan 14, 2015 2:54 PM, "Jeffrey Paul" <jp@eeqj.com> wrote:
> >>
> >>
> >> > On 20150114, at 09:39, devrandom <c1.sf-bitcoin@niftybox.net> wrote:
> >> >
> >> > At CryptoCorp we recommend to our customers that they sort
> >> > lexicographically by the public key bytes of the leaf public keys.
> i.e.
> >> > the same as BitPay.
> >>
> >> To clarify: the raw bytes of the public key itself, not the ascii base58
> >> representation of the pubkey hash - right?
> >>
> >> -jp
> >>
> >> --
> >> Jeffrey Paul                                                      EEQJ
> >> jp@eeqj.com                                           https://eeqj.com
> >> +1-800-403-1126 (America)                  +1-312-361-0355 (Worldwide)
> >> 5539 AD00 DE4C 42F3 AFE1                      1575 0524 43F4 DF2A 55C2
> >>
> >>
> >>
> >>
> ------------------------------------------------------------------------------
> >> 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
> Ashburn.
> >> Choose from 2 high performing configs, both with 100TB of bandwidth.
> >> Higher redundancy.Lower latency.Increased capacity.Completely compliant.
> >> http://p.sf.net/sfu/gigenet
> >> _______________________________________________
> >> Bitcoin-development mailing list
> >> Bitcoin-development@lists.sourceforge.net
> >> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
> >
> >
> >
> ------------------------------------------------------------------------------
> > 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 Ashburn.
> > Choose from 2 high performing configs, both with 100TB of bandwidth.
> > Higher redundancy.Lower latency.Increased capacity.Completely compliant.
> > http://p.sf.net/sfu/gigenet
> > _______________________________________________
> > Bitcoin-development mailing list
> > Bitcoin-development@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
> >
>
>
>
> --
> Andy Alness
> Software Engineer
> Coinbase
> San Francisco, CA
>

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Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Matt Whitlock]

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?

Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Jean-Pierre Rupp]

A public key is a point in the elliptic curve.  As such it has an X and
a Y component.  Its serialization is described very succintly here:

https://en.bitcoin.it/wiki/Protocol_specification#Signatures

On 15/01/15 01:17, Matt Whitlock wrote:
> 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?

-- 
Be Happy :)

Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Ruben de Vries]

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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> wrote:

> On Thu, Jan 15, 2015 at 1:17 AM, Matt Whitlock <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 as
> used in outputs, which compares the 160-bit hash of the pubkey against
> 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 size
> (hashes).
>
> Wladimir
>



-- 
BlockTrail B.V.
Barbara Strozzilaan 201
1083HN Amsterdam
The Netherlands

Phone: +31 (0)612227277
E-mail: ruben@blocktrail.com
Web: www.blocktrail.com
Github: 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

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Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Thomas Kerin]

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-----BEGIN PGP SIGNED MESSAGE-----
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 as
>     used in outputs, which compares the 160-bit hash of the pubkey against
>     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 size
>     (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 Ashburn.
> Choose from 2 high performing configs, both with 100TB of bandwidth.
> Higher redundancy.Lower latency.Increased capacity.Completely compliant.
> http://p.sf.net/sfu/gigenet
>
>
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development

- -- 
Thomas Kerin
- -------------------------

My PGP key can be found here
<http://pgp.mit.edu/pks/lookup?op=get&search=0x3F0D2F83A2966155>
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Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Alan Reiner]

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I see no reason to restrict compressed/uncompressed.  Strings don't have
to be the same length to sort them lexicographically.  If a multi-sig
participant provides an uncompressed key, they are declaring that the
key that they use and it will only be used uncompressed.   Clients don't
have to go looking for all combinations of compressed & uncompressed.

On 01/16/2015 11:34 AM, Thomas Kerin wrote:
>
>
> 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 as
> >     used in outputs, which compares the 160-bit hash of the pubkey
> against
> >     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 size
> >     (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
> Ashburn.
> > Choose from 2 high performing configs, both with 100TB of bandwidth.
> > Higher redundancy.Lower latency.Increased capacity.Completely compliant.
> > http://p.sf.net/sfu/gigenet
>
>
> > _______________________________________________
> > Bitcoin-development mailing list
> > Bitcoin-development@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
>
>
>
>
------------------------------------------------------------------------------
> 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 Ashburn.
> Choose from 2 high performing configs, both with 100TB of bandwidth.
> Higher redundancy.Lower latency.Increased capacity.Completely compliant.
> http://p.sf.net/sfu/gigenet
>
>
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development



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Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Jeff Garzik]

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Sounds like this warrants a micro-BIP just to get everybody on the same
page.


On Wed, Jan 14, 2015 at 11:37 AM, Ruben de Vries <ruben@blocktrail.com>
wrote:

> For p2sh multisig TXs the order of the public keys affect the hash and
> there doesn't seem to be an agreed upon way of sorting the public keys.
>
> If there would be a standard (recommended) way of sorting the public keys
> that would make it easier for services that implement some form of multisig
> to be compatible with each other without much hassle and making it possible
> to import keys from one service to another.
>
> I'm not suggesting forcing the order, just setting a standard to
> recommend, there doesn't seem to be much reason for (new) services to not
> follow that recommendation.
>
> Ryan from BitPay broad this up before (
> https://sourceforge.net/p/bitcoin/mailman/message/32092958/) and in
> bitcore they've implemented lexicographical sorting on the hex of the
> public key.
> In a short search I can't find any other library that has a sorting
> function, let alone using it by default, so bitcore is currently my only
> reference.
>
>
> ​Ruben de Vries
> ​CTO, BlockTrail
>
>
> ------------------------------------------------------------------------------
> New Year. New Location. New Benefits. New Data Center in Ashburn, VA.
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> Choose from 2 high performing configs, both with 100TB of bandwidth.
> Higher redundancy.Lower latency.Increased capacity.Completely compliant.
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> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
>


-- 
Jeff Garzik
Bitcoin core developer and open source evangelist
BitPay, Inc.      https://bitpay.com/

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Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Jonathan Brown]

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In BIP45 it mentions "lexicographically sorting the public keys".

https://github.com/bitcoin/bips/blob/master/bip-0045.mediawiki#Address_Generation_Procedure

On 15 January 2015 at 03:32, Jeff Garzik <jgarzik@bitpay.com> wrote:

> Sounds like this warrants a micro-BIP just to get everybody on the same
> page.
>
>
> On Wed, Jan 14, 2015 at 11:37 AM, Ruben de Vries <ruben@blocktrail.com>
> wrote:
>
>> For p2sh multisig TXs the order of the public keys affect the hash and
>> there doesn't seem to be an agreed upon way of sorting the public keys.
>>
>> If there would be a standard (recommended) way of sorting the public keys
>> that would make it easier for services that implement some form of multisig
>> to be compatible with each other without much hassle and making it possible
>> to import keys from one service to another.
>>
>> I'm not suggesting forcing the order, just setting a standard to
>> recommend, there doesn't seem to be much reason for (new) services to not
>> follow that recommendation.
>>
>> Ryan from BitPay broad this up before (
>> https://sourceforge.net/p/bitcoin/mailman/message/32092958/) and in
>> bitcore they've implemented lexicographical sorting on the hex of the
>> public key.
>> In a short search I can't find any other library that has a sorting
>> function, let alone using it by default, so bitcore is currently my only
>> reference.
>>
>>
>> ​Ruben de Vries
>> ​CTO, BlockTrail
>>
>>
>> ------------------------------------------------------------------------------
>> 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 Ashburn.
>> Choose from 2 high performing configs, both with 100TB of bandwidth.
>> Higher redundancy.Lower latency.Increased capacity.Completely compliant.
>> http://p.sf.net/sfu/gigenet
>> _______________________________________________
>> Bitcoin-development mailing list
>> Bitcoin-development@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>>
>>
>
>
> --
> Jeff Garzik
> Bitcoin core developer and open source evangelist
> BitPay, Inc.      https://bitpay.com/
>
>
> ------------------------------------------------------------------------------
> 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 Ashburn.
> Choose from 2 high performing configs, both with 100TB of bandwidth.
> Higher redundancy.Lower latency.Increased capacity.Completely compliant.
> http://p.sf.net/sfu/gigenet
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
>

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Re: [Bitcoin-development] convention/standard for sorting public keys for p2sh multisig transactions

[Jean-Pierre Rupp]

It is better if the scheme is strongly deterministic.On 16 Jan 2015 17:09, Alan Reiner <etotheipi@gmail.com> wrote:
>
> I see no reason to restrict compressed/uncompressed.  Strings don't have to be the same length to sort them lexicographically.  If a multi-sig participant provides an uncompressed key, they are declaring that the key that they use and it will only be used uncompressed.   Clients don't have to go looking for all combinations of compressed & uncompressed.
>
> On 01/16/2015 11:34 AM, Thomas Kerin wrote:
> >
>>
>>
>> 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 as
>> >     used in outputs, which compares the 160-bit hash of the pubkey against
>> >     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 size
>> >     (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 Ashburn.
>> > Choose from 2 high performing configs, both with 100TB of bandwidth.
>> > Higher redundancy.Lower latency.Increased capacity.Completely compliant.
>> > http://p.sf.net/sfu/gigenet
>>
>>
>> > _______________________________________________
>> > Bitcoin-development mailing list
>> > Bitcoin-development@lists.sourceforge.net
>> > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>>
> >
> >
> >
> > ------------------------------------------------------------------------------
> > 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 Ashburn.
> > Choose from 2 high performing configs, both with 100TB of bandwidth.
> > Higher redundancy.Lower latency.Increased capacity.Completely compliant.
> > http://p.sf.net/sfu/gigenet
> >
> >
> > _______________________________________________
> > Bitcoin-development mailing list
> > Bitcoin-development@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
>