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From: Btc Drak <btcdrak@gmail.com>
To: "Jorge Timón" <jtimon@jtimon.cc>
Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] CLTV opcode allocation; long-term plans?
Date: Tue, 12 May 2015 20:30:35 +0100	[thread overview]
Message-ID: <CADJgMzv1NdoXKDScQ1+OycijzME=W2YSut3GMF=EEuKQf6VeUg@mail.gmail.com> (raw)
In-Reply-To: <CABm2gDqVu9OqNpOgCa6hMw3CXp7ePWTaAGPtMq4T9rG658K=ow@mail.gmail.com>

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Gavin and @NicolasDorier have a point: If there isn't actually scarcity of
NOPs because OP_NOP10 could become <type> OP_EX (if we run out), it makes
sense to chose the original unparameterised CLTV version #6124 which also
has been better tested. It's cleaner, more readable and results in a
slightly smaller script which has also got to be a plus.

On Tue, May 12, 2015 at 8:16 PM, Jorge Timón <jtimon@jtimon.cc> wrote:

> This saves us ocodes for later but it's uglier and produces slightly
> bigger scripts.
> If we're convinced it's worth it, seems like the right way to do it,
> and certainly cltv and rclv/op_maturity are related.
> But let's not forget that we can always use this same trick with the
> last opcode to get 2^64 brand new opcodes.
> So I'm not convinced at all on whether we want  #5496 or #6124.
> But it would be nice to decide and stop blocking  this.
>
> On Sat, May 9, 2015 at 11:12 AM, Peter Todd <pete@petertodd.org> wrote:
> > On Tue, May 05, 2015 at 01:54:33AM +0100, Btc Drak wrote:
> >> > That said, if people have strong feelings about this, I would be
> willing
> >> > to make OP_CLTV work as follows:
> >> >
> >> >     <nLockTime> 1 OP_CLTV
> >> >
> >> > Where the 1 selects absolute mode, and all others act as OP_NOP's. A
> >> > future relative CLTV could then be a future soft-fork implemented as
> >> > follows:
> >> >
> >> >     <relative nLockTime> 2 OP_CLTV
> >> >
> >> > On the bad side it'd be two or three days of work to rewrite all the
> >> > existing tests and example code and update the BIP, and (slightly)
> gets
> >> > us away from the well-tested existing implementation. It also may
> >> > complicate the codebase compared to sticking with just doing a Script
> >> > v2.0, with the additional execution environment data required for v2.0
> >> > scripts cleanly separated out. But all in all, the above isn't too big
> >> > of a deal.
> >>
> >>
> >> Adding a parameter to OP_CLTV makes it much more flexible and is the
> most
> >> economic use of precious NOPs.
> >> The extra time required is ok and it would be good to make this change
> to
> >> the PR in time for the feature freeze.
> >
> > Done!
> >
> > https://github.com/bitcoin/bitcoin/pull/5496#issuecomment-100454263
> >
> > --
> > 'peter'[:-1]@petertodd.org
> > 000000000000000012c438a597ad15df697888be579f4f818a30517cd60fbdc8
> >
> >
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>

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  parent reply	other threads:[~2015-05-12 19:31 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-04  5:07 [Bitcoin-development] CLTV opcode allocation; long-term plans? Peter Todd
2015-05-05  0:54 ` Btc Drak
2015-05-09  9:12   ` Peter Todd
2015-05-12 19:16     ` Jorge Timón
2015-05-12 19:23       ` Pieter Wuille
2015-05-12 19:30       ` Btc Drak [this message]
2015-05-12 20:38         ` Luke Dashjr
2015-05-12 21:01           ` Peter Todd
2015-05-13  0:38             ` Jorge Timón
2015-05-07  1:35 ` Rusty Russell
2015-05-07 17:17   ` Peter Todd

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