14th April 2013 weekly pool and network statistics

Welcome, miners.

Changelog:

• Figure 8 (Chart of fulltime miner earnings loss at a proportional pool caused by pool hoppers) has been removed since very little pool hopping has occurred. Instead, figure 8 is now the user hashrate distribution, as a follow up to post 12.1 The pre-ASIC network hashrate distribution.

Pools missing from results:

• None, although MTRED (which sadly closed its doors this week) will be missing from next week's results. They're included this week since there were nine blocks solved by the pool during the current week before they closed.

"ASIC ready" pools:

• BTCGuild
• 50BTC.com
• Slush's pool
• Ozcoin
• HHTT
• Bitminter
• EclipseMC
• Eligius
• Bitparking
• Itzod
• Triplemining

Pool hopping:

• None

BTCGuild is almost at 40% of the weekly average network hashrate this week (although only 36.7% of network blocks, thanks to some bad luck). The pool is keeping pace with the increase in weekly average network hashrate, ~ 6 Thps. This is good news for the pool and the network in general - on average, miners are choosing not to start at BTCGuild or move there from other pools.

Bitminter has become a top 5 hashrate pool and Slush's pool is vying with 50BTC.com to hit second spot - back to where it was when DeepBit was king.

As usual, please post comments if there's anything you don't understand, with which you disagree, or just think is wrong.


The charts

Table: Table of all pools with public data and their various statistics averaged for the last seven days - for smaller pools the average may be more or less than seven days, depending on number of blocks solved for the week. Network hashrate and 50BTC.com hashrate are estimates, the upper and lower 95% confidence interval bounds are included.
Figure 1: Pie chart of the percentage of network blocks hashrate by pool. "Unknown" combines those pools for which I can't scrape statistics, solominers and private pools. The percentage of network hashrate will only be approximate since the exact network hashrate is unknown.

Figure 2: Chart of network hashrate, hashrate of the largest mining pool, combined hashrates of the three largest mining pools, and a line representing 50% of the network hashrate. Handy if you're worried about 51% attacks. The upper and lower 95% confidence interval bounds for the network hashrate are in between the shaded areas.

Figure 3: Chart of chronology of pool hashrates, averaged per week.

Figure 4: Chart of average hashrates per pool per round for the week, and per 144 rounds for the network. The upper and lower 95% confidence interval bounds for the network hashrate are in between the shaded areas.

Figure 5: Chart of chronology of negative binomial CDF probability of shares submitted and blocks produced for the week.

Figure 6: Chart of chronology of round length divided by difficulty, averaged per week.

Figure 7: Chart of hashrate vs round length for hoppable pools (the larger the hashrate increase at the start of a round, the larger the loss to strategic miners).

Figure 8: Chart of pool user hashrate distribution. Note that for some pools this average is 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.

Thanks to blockexplorer.com and blockchain.info for use of their network statistics.

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