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From: Peter Vessenes <peter@coinlab.com>
To: Mike Hearn <mike@plan99.net>
Cc: bitcoin-development@lists.sourceforge.net
Subject: Re: [Bitcoin-development] Reconsidering block version number use
Date: Tue, 24 Jul 2012 17:01:11 +0900	[thread overview]
Message-ID: <CAMGNxUvRXA4y98ojrzQqLhKcYPXM9CUFXKdguQz3iu=jaNvk5w@mail.gmail.com> (raw)
In-Reply-To: <CANEZrP0NMmwWN1U3V_hha7+C8meKWK_szhh+6xP7VQMbFTLoqQ@mail.gmail.com>

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I think it would be great to have more nonce space with less merkle
calculation; keeping track of all possible versions of a block already
takes real RAM, real computation. Being able to change one bit in the
header and send out a new block for checking would ease our pool server
work by a real amount, somewhat on the work generation side, but also on
the checking old work side; we'll have a lot fewer unique transaction /
coinbase sets to hold on to for checking when we get back a solution.

Peter


On Tue, Jul 24, 2012 at 4:58 PM, Mike Hearn <mike@plan99.net> wrote:

> > That'd be 7 bytes of nonce in the block header, which is
> >   72,057,594,037,927,936  ~ 72 petahashes = 72,000 terahashes
> >
> > So: the changes for version 2 blocks would be "has height in the
> > coinbase, and has a 1-byte version number with a 3-byte extranonce."
>
> I don't understand why more nonce bits are necessary. Is it really
> impossible for a multi-core CPU to keep up with the merkle root
> re-calculation and keep an ASIC miner fed, or is this working around a
> performance bottleneck somewhere else?
>
>
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-- 
------------------------------

[image: CoinLab Logo]PETER VESSENES
CEO

*peter@coinlab.com * /  206.486.6856  / SKYPE: vessenes
811 FIRST AVENUE  /  SUITE 480  /  SEATTLE, WA 98104

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  reply	other threads:[~2012-07-24  8:31 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-22 20:52 [Bitcoin-development] Reconsidering block version number use Luke-Jr
2012-07-23  0:41 ` Gavin Andresen
2012-07-23  0:57   ` Luke-Jr
2012-07-24  7:58   ` Mike Hearn
2012-07-24  8:01     ` Peter Vessenes [this message]
2012-07-24  8:22       ` Mike Hearn

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