Mining Hashrate Caps

Mining Hashrate Caps
2014-07-17 13:35 ` Mark Friedenbach
  
From: Melvin Carvalho @ 2014-07-17 10:59 UTC (permalink / raw)
  To: Bitcoin Dev

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I noticed this article today.

GHash Commits to 40% Hashrate Cap at Bitcoin Mining Summit

http://www.coindesk.com/ghash-commits-40-hashrate-cap-bitcoin-mining-summit/

Here's a quote from Satoshi when the mining arms race began:

"We should have a gentleman’s agreement to postpone the GPU arms race as
long as we can for the good of the network. It’s much easer to get new
users up to speed if they don’t have to worry about GPU drivers and
compatibility. It’s nice how anyone with just a CPU can compete fairly
equally right now."

Maybe outdated now, but I thought it was interesting.

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 permalink raw reply	[|nested]
2014-07-17 10:59 [Bitcoin-development] Mining Hashrate Caps Melvin Carvalho

  2014-07-17 15:45   ` David A. Harding
  
From: Mark Friedenbach @ 2014-07-17 13:35 UTC (permalink / raw)
  To: bitcoin-development

Can someone explain to these guys and the public why promising to limit
yourselves to *only* a 50% chance of successfully double-spending a 6
confirm transaction is still not acceptable?

q=0.4
z=0	P=1
z=1	P=0.828861
z=2	P=0.736403
z=3	P=0.664168
z=4	P=0.603401
z=5	P=0.550625
z=6	P=0.50398
z=7	P=0.462301
z=8	P=0.424782
z=9	P=0.390828
z=10	P=0.359976
z=11	P=0.331858
z=12	P=0.306167
z=13	P=0.282649
z=14	P=0.261083
z=15	P=0.24128
z=16	P=0.223076
z=17	P=0.206324
z=18	P=0.190896
z=19	P=0.176676


On 07/17/2014 06:59 AM, Melvin Carvalho wrote:
> I noticed this article today. 
> 
> GHash Commits to 40% Hashrate Cap at Bitcoin Mining Summit
> 
> http://www.coindesk.com/ghash-commits-40-hashrate-cap-bitcoin-mining-summit/
> 
> Here's a quote from Satoshi when the mining arms race began:
> 
> "We should have a gentleman’s agreement to postpone the GPU arms race as
> long as we can for the good of the network. It’s much easer to get new
> users up to speed if they don’t have to worry about GPU drivers and
> compatibility. It’s nice how anyone with just a CPU can compete fairly
> equally right now."
> 
> Maybe outdated now, but I thought it was interesting.
> 
> 
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> 



 permalink raw reply	[|nested]
2014-07-17 13:35 ` Mark Friedenbach

  
From: David A. Harding @ 2014-07-17 15:45 UTC (permalink / raw)
  To: Mark Friedenbach;  bitcoin-development

On Thu, Jul 17, 2014 at 09:35:20AM -0400, Mark Friedenbach wrote:
> Can someone explain to these guys and the public why promising to limit
> yourselves to *only* a 50% chance of successfully double-spending a 6
> confirm transaction is still not acceptable?

Hi, Mark.

We were asked on the bitcoin-documentation mailing list about a month
ago to work on something like this and we're getting close to a pull
request for the Bitcoin.org website.  There's a preview here:

    http://dg0.dtrt.org/en/mining#lucky-attack

(Remember, it's a preview and still being actively written/edited.)

Discussion about that doc belongs on the bitcoin-documentation mailing
list. Here's the particular thread:

    https://groups.google.com/forum/#!topic/bitcoin-documentation/PKwBcroWGGg

Thanks,

-Dave
-- 
David A. Harding



 permalink raw reply	[|nested]