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
>
>
>
>
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>
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>
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>
> >
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