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From: Peter Todd <pete@petertodd.org>
To: Btc Drak <btcdrak@gmail.com>
Cc: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] BIP: Using Median time-past as endpoint for locktime calculations
Date: Thu, 27 Aug 2015 16:19:13 -0700	[thread overview]
Message-ID: <20150827231913.GC4125@muck> (raw)
In-Reply-To: <CADJgMztcy33cW4=SOfsmANMFCU3Q7pcLqatG9JeJCgEXnpkD+g@mail.gmail.com> <CADJgMzvfeka5WXyjz8oeTtKUSrfxWBGR7BMujJ-4LL2jrcUuZw@mail.gmail.com>

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On Thu, Aug 27, 2015 at 11:08:32PM +0100, Btc Drak wrote:
> This BIP was assigned number 113.
> 
> I have updated the text accordingly and added credits to Gregory Maxwell.
> 
> Please see the changes in the pull request:
> https://github.com/bitcoin/bips/pull/182

On Thu, Aug 27, 2015 at 11:11:10PM +0100, Btc Drak via bitcoin-dev wrote:
> I have changed BIPS 112 and 113 to reflect this amended deployment
> strategy. I'm beginning to think the issues created by Bitcoin XT are
> so serious it probably deserves converting OPs text into an
> informational BIP.

I thought we had decided that the masking thing doesn't work as
intended?

To recap, XT nodes are producing blocks with nVersion=0b001...111

You're suggesting that we apply a mask of ~0b001...111 then trigger the
soft-fork on nVersion >= 0b0...100 == 4, with miners producing blocks with
nVersion=0b0...1000

That will work, but it still uses up a version bit. The reason why is
blocks with nVersion=0b001...000 - the intended deployment of the
nVersion bits proposal - will be rejected by the nVersion >= 4 rule,
hard-forking them off the network. In short, we have in fact "burnt" a
version bit unnecessarily.

If you're going to accept hard-forking some people off the network, why
not just go with my stateless nVersion bits w/ time-expiration proposal
instead? The only case where it leads to a hard-fork is if a soft-fork
has been rejected by the time the upgrade deadline is reached. It's easy
to set this multiple years into the future, so I think in practice it
won't be a major issue for non-controversial soft-forks.

Equally, spending the time to implement the original stateful nVersion
bits proposal is possible as well, though higher risk due to the extra
complexity of tracking soft-fork state.

-- 
'peter'[:-1]@petertodd.org
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  reply	other threads:[~2015-08-27 23:19 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-18  1:22 [bitcoin-dev] BIP: Using Median time-past as endpoint for locktime calculations Thomas Kerin
2015-08-19  1:04 ` Peter Todd
2015-08-19  1:08   ` Mark Friedenbach
2015-08-21 11:13     ` Thomas Kerin
2015-08-22  0:57       ` Peter Todd
2015-08-27 22:08         ` Btc Drak
2015-08-27 23:19           ` Peter Todd [this message]
2015-08-28 15:27             ` jl2012
2015-08-19  5:50 [bitcoin-dev] CLTV/CSV/etc. deployment considerations due to XT/Not-BitcoinXT miners Peter Todd
2015-08-19  6:10 ` Mark Friedenbach
2015-08-19  9:34   ` Jorge Timón
2015-08-19 10:20     ` Btc Drak
2015-08-19 10:31       ` Jorge Timón
2015-08-19 13:15         ` Btc Drak
2015-08-19 13:24           ` Tier Nolan
2015-08-19 17:25             ` Btc Drak
2015-08-19 18:17               ` Tier Nolan
2015-08-19 12:36     ` Matt Corallo
2015-08-19 13:22   ` Tier Nolan
2015-08-19 14:01     ` Jeff Garzik
2015-08-19 16:32     ` Mark Friedenbach
2015-08-19 21:03       ` Peter Todd
2015-08-20 17:32 ` jl2012
2015-08-20 17:42   ` Mark Friedenbach
2015-08-27 22:11     ` Btc Drak

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