Bitcoin Forum
December 07, 2016, 08:42:09 AM *
News: To be able to use the next phase of the beta forum software, please ensure that your email address is correct/functional.
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: can network speed be directly derived from difficulty?  (Read 1466 times)
satonit
Newbie
*
Offline Offline

Activity: 5


View Profile
May 25, 2011, 09:37:08 PM
 #1

say.. average a miner can get 1.8 ghash per KWH.

if difficulty is at 420,000 ... can i derive ghash of ENTIRE network some how??

bitcoinchart say 3,500,000 mhash... how they calculate?

1 difficulty = 8 mhash?

also, what EXACTLY is a bitcoin "hash" ? 1 "hash" is actually 2 x AEC256 ?

1481100129
Hero Member
*
Offline Offline

Posts: 1481100129

View Profile Personal Message (Offline)

Ignore
1481100129
Reply with quote  #2

1481100129
Report to moderator
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
Stephen Gornick
Legendary
*
Offline Offline

Activity: 1988



View Profile
May 25, 2011, 09:42:23 PM
 #2

if difficulty is at 420,000 ... can i derive ghash of ENTIRE network some how??

Quote
So total network power, in hash/sec, is then
(difficulty * 2^32) / 600

Where 600 is a smoothed approximation of last-block-interval-in-seconds.
- http://forum.bitcoin.org/?topic=402.msg10162#msg10162

An estimate of the current Network Hashrate is available from:
  - http://bitcoinwatch.com

Graphs of these levels are here:
  - http://bitcoin.sipa.be

  


Pieter Wuille
Legendary
*
qt
Offline Offline

Activity: 1036


View Profile WWW
May 25, 2011, 09:43:02 PM
 #3

1 "hash" is double-SHA256 applied to a block header. Because some parts can be pre-calculated, and some parts ignored for our application, it is in reality equivalent to processing approximately 1.9 SHA256 blocks.

There is an easy relation between difficulty and block rate. For each block the network finds, on average 2^48/65535 (=4295032833)  times the difficulty hashes have been performed.

There is a relation between the difficulty and the network hash rate as well, assuming you know how often a block is found. Assuming there is one block every 10 minutes (as the network aims for), there are difficulty*2^48/65535/600 hashes done per second (=7158388*difficulty). If there are more blocks found than 1 per ten minutes, the rate is proportionally higher.

Currently (at difficulty 244139), this means that each block requires on average a whopping 1048587089228612 hashes to be performed.

aka sipa, core dev team

Tips and donations: 1KwDYMJMS4xq3ZEWYfdBRwYG2fHwhZsipa
Pages: [1]
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!