From: Christian Decker <decker.christian@gmail•com>
To: bitcoin-dev@lists•linuxfoundation.org
Subject: Re: [bitcoin-dev] Requesting BIP assignment; Flexible Transactions.
Date: Thu, 22 Sep 2016 13:10:49 +0200 [thread overview]
Message-ID: <20160922111049.GA592@nex> (raw)
In-Reply-To: <1988067.b5KirJFSKj@garp>
On Thu, Sep 22, 2016 at 10:56:31AM +0200, Tom via bitcoin-dev wrote:
> On Wednesday 21 Sep 2016 18:01:30 Gregory Maxwell via bitcoin-dev wrote:
> > On Tue, Sep 20, 2016 at 5:15 PM, Tom via bitcoin-dev
> >
> > <bitcoin-dev@lists•linuxfoundation.org> wrote:
> > > BIP number for my FT spec.
> >
> > This document does not appear to be concretely specified enough to
> > review or implement from it.
> >
> > For example, it does not specify the serialization of "integer"
>
> It refers to the external specification which is linked at the bottom.
> In that spec you'll see that "Integer" is the standard var-int that Bitcoin
> has used for years.
I think BIPs should be self-contained, or rely on previous BIPs,
whenever possible. Referencing an external formatting document should
be avoided and requiring readers to reverse engineer a reference
implementation doesn't seem too user friendly either. Publishing a BIP
with CMF would certainly help, and completing this spec with the
details that are missing, or only "defined" in the implementation,
would be better.
> > nor does it specify how the
> > presence of the optional fields are signaled
>
> How does one signals an optional field except of in the spec? Thats the job of
> a specification.
So the presence is signaled by encountering the tag, which contains
both token type and name-reference. The encoder and decoder operations
could be described better.
> > nor the cardinality of
> > the inputs or outputs.
>
> Did you miss this in the 3rd table ? I suggest clicking on the github bips
> repo link as tables are not easy to read in mediawiki plain format that the
> email contained.
Minor nit: that table is not well-formed. As was pointed out in the
normalized transaction ID BIP, your proposal only addresses
third-party malleability, since signers can simply change the
transaction and re-sign it. This is evident from the fact that inputs
and outputs do not have a canonical order and it would appear that
tokens can be re-ordered in segments. Dependencies of tokens inside a
segment are also rather alarming (TxInPrevHash <-> TxInPrevIndex,
TxOutScript <-> TxOutValue).
Finally, allowing miners to reject transactions with unknown fields
makes the OP_NOPs unusable since they'd result in forks: non-upgraded
nodes would reject blocks from upgraded nodes.
Regards,
Christian
next prev parent reply other threads:[~2016-09-22 11:10 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-20 17:15 Tom
2016-09-20 21:31 ` Luke Dashjr
2016-09-21 9:32 ` Tom
2016-09-20 21:56 ` Peter Todd
2016-09-21 9:32 ` Tom
2016-09-22 18:26 ` Peter Todd
2016-09-22 18:47 ` Tom
2016-09-21 12:00 ` Andreas Schildbach
2016-09-21 12:58 ` Tom
[not found] ` <CAAS2fgSpnshZhS7N5R3Qsw_8=NN8sjYGwrnUpdwGzu2TG0-Qgw@mail.gmail.com>
2016-09-21 18:01 ` Gregory Maxwell
2016-09-22 8:56 ` Tom
2016-09-22 11:10 ` Christian Decker [this message]
2016-09-22 12:09 ` Tom
2016-09-23 11:42 ` Christian Decker
2016-09-23 13:17 ` Tom
2016-09-21 22:45 adiabat
2016-09-22 8:47 ` Tom
2016-09-22 18:27 ` Peter Todd
2016-09-22 18:37 ` Tom
2016-09-22 19:59 ` Jonas Schnelli
2016-09-22 20:07 ` Tom
2016-09-23 11:55 ` Christian Decker
2016-09-23 13:13 ` Tom
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