From: "Luke-Jr" <luke@dashjr.org>
To: bitcoin-development@lists.sourceforge.net
Date: Tue, 27 Sep 2011 23:54:00 -0400
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Subject: Re: [Bitcoin-development] Deprecating "midstate" in getwork?
Precedence: list

On Tuesday, September 27, 2011 11:45:48 PM Jeff Garzik wrote:
> On Mon, Sep 26, 2011 at 3:42 PM, Nils Schneider <nils@nilsschneider.net> 
wrote:
> > I'd like to simplify the internal reference miner and remove all
> > dependencies on cryptopp (it's the only place we use cryptopp instead of
> > OpenSSL).
> > 
> > Unfortunately, cryptopp is also used to calculate getwork "midstate".
> > This field is redundant and the miner could easily calculate it from the
> > blockheader so I'd like to remove it.
> > 
> > Any thoughts? Where should such a change should be announced so all
> > miners can be upgraded?
> 
> I think one of the pools was already working on something like that?
> I'm pretty sure it can be removed, and I'm pretty sure somebody has
> already field-tested that guess.

I tested removing midstate myself, and found at least one miner (cpuminer 
IIRC) requires it.