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.<div>
<br></div><div>Peter</div><div><br></div><div><br><div class="gmail_quote">On Tue, Jul 24, 2012 at 4:58 PM, Mike Hearn <span dir="ltr"><<a href="mailto:mike@plan99.net" target="_blank">mike@plan99.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">> That'd be 7 bytes of nonce in the block header, which is<br>
> 72,057,594,037,927,936 ~ 72 petahashes = 72,000 terahashes<br>
><br>
> So: the changes for version 2 blocks would be "has height in the<br>
> coinbase, and has a 1-byte version number with a 3-byte extranonce."<br>
<br>
</div>I don't understand why more nonce bits are necessary. Is it really<br>
impossible for a multi-core CPU to keep up with the merkle root<br>
re-calculation and keep an ASIC miner fed, or is this working around a<br>
performance bottleneck somewhere else?<br>
<div class="HOEnZb"><div class="h5"><br>
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