27th January 2013 weekly pool and network statistics

Welcome, miners.

Not many surprises this week, so I added a new chart.

Figure 1 is a 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.

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


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 fulltime miner earnings loss at a proportional pool caused by pool hoppers, expressed as expected PPS earnings for fulltime miners. Currently only for Bitlc and Deepbit. Only valid if strategic pool hopping is actually occurring (see figure 7). 

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

Donations help give me the time to analyse bitcoin mining related issues and write these posts. If you enjoy or find them helpful, please consider a small bitcoin donation:

12QxPHEuxDrs7mCyGSx1iVSozTwtquDB3r