23rd September weekly pool statistics

The biggest changes made this week involved ensuring that no previously recorded rounds were recorded a second time, and making the yellow colour in the hashrate history chart easier to see. Both suggestions were courtesy of Dr. Haribo, pool op of "Bitminter".

BTCGuild lost a little percentage of the network hashrate and 50BTC gained some, bringing them quite close to DeepBit's hashrate. DeepBit now has a challenger for the top spot for the first time in more than a year.

Most other pools this week lost or maintained their percentage of the network hashrate.

If your pool isn't here and you'd like it to be, comment with  a link to a block history with round lengths and either solve times to the nearest second or a timestamp.

Average hashrate:

Average hashrate = Total shares / Total round time

Luck index:

log(% of network blocks solved / % of network hashrate)

Luck index = 0 is average luck

Luck index > 0 is good luck

Luck index < 0 is poor luck

Weekly average round length as a fraction of difficulty:

Average number of shares submitted per round / difficulty

Figure 1: 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.

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.

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

Figure 4: Chart of average hashrates per pool per round for the week.
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 pool luck indexes, averaged per week.
Figure 7: Chart of chronology of round length divided by difficulty, averaged per week.
Figure 8: Chart of percentage of orphaned blocks produced by the pool, averaged per week.
Figure 9: 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).

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