September 18th 2016 Mining Pool Statistics



Other weekly pool statistics posts
Weekly network statistics posts
Weekly block maker statistics posts

Changelog:

  • Nil.
Errorlog:
  • Nil.
To do:

  • Nil.




0. I get internet, you get weekly stats
So I’m finally back online, and the stats are back. Thanks everyone who emailed me asked when I’d return, and especially thanks to the guys who are helping me get a cloud based system running, and I hope eventually to move to a Jekyll blog on github.io.

1. GHash.IO increases size?
GHash.IO saw a very large increase in hashrate this week, but from the Gini chart it doesn’t look like it is coming from just one very large user account. Is there a chance GHash.IO is on it’s way back?


  • FAQ: Bitcoin mining and luck

Explanation of the tables and charts

Pool reported block history statistics. This table lists all statistics that can be derived from the number of blocks a hashrate contributor has solved for the past week using all solved blocks – both valid and orphaned – and difficulty 1 shares per round. 
  • A much more accurate estimate of the hashrate, confidence intervals are unnecessary.
  • Orphan races lost, and percentage of  solved blocks that were not added to the blockchain.
  • “Luck” is the usual difficulty 1 equivalent shares per round / mining difficulty,  or (equivalently) accepted shares / expected shares.
  • CDF: The cumulative density function (CDF) measures the percentage of the time this number accepted shares / expected shares would be less than the calculated value, given the number of valid + invalid blocks.
  • Pool profitability compares variables such as total number of shares in a week and total reward (including transactions) in a week with the expected reward per share as follows (pool fee not included):

a = reward estimate (tx-free bitcoin rewards) per valid block including orphaned blocks 
b = estimated difficulty 1 shares for valid blocks
c = actual rewards for valid blocks
d = submitted difficulty 1 shares for all blocks including orphaned blocks

Actual reward per share = c / d
Theoretical reward per share = a / b

Profitability = Actual reward per share /  Theoretical reward per share








Average hashrate per solved block (valid + invalid)
Hashrates are calculated from the pool reported difficulty-1 equivalent shares per round and the pool reported block solve times for all solved blocks, both valid and invalid. 



Average Pool profitability per week and per block
Pool profitability compares variables such as total number of shares in a week and total reward (including transactions) in a week with the expected reward per share. Pool fee is not included, but this is a good basis on which to compare pools, as long as you’re aware of pool fees, whether transaction fees are paid to you, and whether or not the pool is paying for   orphaned blocks. Details of the profitability calculation are given in the block history table.

Obviously these charts are only relevant to miner income if the reward method is not PPS; however the charts can also be interpreted as the profitability of the pool, so it might give you some insight into the financial health of a PPS pool.

The average profitability per week chart is a kernel smoothed average, with a bandwidth of 500 blocks (same as the orphan plot). Pools are only included if they have solved 500 or more blocks and have made a block during the current week.




Density of orphaned blocks
This chart shows the density of orphaned blocks per pool, as a function of blocks solved by that pool. The fringe indicates the actual occurrences of the orphaned blocks, and the colour of the line and fringe indicate the approximate date.





Pool user hashrate and combined user hashrate densities
The top facet of this chart shows the proportion of user accounts with a given hashrate – the thicker the “violin” the greater the density of user accounts with a particular hashrate.

The bottom facet is the same data, weighted by hashrate. In effect, it shows what proportion of the pool’s hashrate is supplied by particular hashrates. The area of the “violins” is proportional to their total hashrate.

Note that for some pools the hashrate is averaged over twenty four hours, some pools are averaged over an hour or more and some for only fifteen minutes, so expect some variance in the results.



Gini coefficient for miner hashrates

The Gini coefficient measures inequality, as is further discussed here. In the plot below, it is measuring inequality within public mining pools. The lower the coefficient, the less inequality in the pool.


These indices are much higher than most things for which the Gini coefficient is calculated. For example in countries with notoriously unequal incomes it is rarely above 65% (Seychelles, 2007), and educational inequality in the poorest countries comes close, at 92% (Mali, 1990). There are a large number of bitcoin miners with near (or less than) zero income, and a small few who actually make a living.


“All combined” is the Gini coefficient for miners at all pools that can be monitored, combined. It is more affected by larger pools and less affected by smaller pools. 





Organofcorti lives in the blockchain!

organofcorti.blogspot.com is a reader supported blog:

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Created using R and various packages, especially dplyr, data.table, ggplot2 and forecast.

Thank you to blocktrail.com for use of their address data, and coincadence.com for their p2pool miner data.


Thanks also to Matt’s Alternative AntPool API for AntPool block data.

Find a typo or spelling error? Email me with the details at organofcorti@organofcorti.org and if you’re the first to email me I’ll pay you 0.01 btc per ten errors.

Please refer to the most recent blog post for current rates or rule changes.

I’m terrible at proofreading, so some of these posts may be worth quite a bit to the keen reader.
Exceptions:
  • Errors in text repeated across multiple posts: I will only pay for the most recent errors rather every single occurrence.
  • Errors in chart texts: Since I can’t fix the chart texts (since I don’t keep the data that generated them) I can’t pay for them. Still, they would be nice to know about!
I write in British English.






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