9th June 2013 weekly pool and network statistics

Welcome, miners.

Changelog:

• Blocks solved with coinbase signatures of "Made in China" and  "七彩神仙鱼" both pay to the same bitcoin address, so they've been combined into one pool, "Discus fish".
• Ozcoin's data is now calculated from the number of blocks solved in one week, using their coinbase signature.

Pools missing from results:

• Coinotron - site down

Errors:

• Nil

Pools with coinbase signature:

• ASICMiner: "Mined By ASICMiner"
• 50BTC.com: "Hi from 50BTC.com
• Bitparking: "bitparking"
• BitMinter:  "BitMinter"
• BTCGuild :  "Mined by BTC Guild", "BTC Guild DE", "BTC Guild 2", "BTC Guild 2"
• Discus Fish: "七彩神仙鱼" and "Made in China"
• EclipseMC: "EMC"
• Eligius: "Eligius"
• HHTT: "HHTT"
• Ozcoin: "ozcoin"
• Triplemining: "Triplemining.com"
• Slush's pool: "slush"
• ST Mining Corp: "st mining corp"

Pool hopping:

• None.

A huge 25 Thps increase in the average weekly network hashrate this week - that's about a 25% increase in one week, of the weekly average. This hasn't happened since the first batch of Avalons were released combined with the start of the last btc price bubble.

Since it will be mostly miners reading this, I'd like to invite you to complete a survey I introduced in this post on the cost of mining. It will be a huge benefit when it comes to fighting FUD form news outlets looking for a suitably scary news story to demonise bitcoin.

 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 an hour or more and some for only fifteen minutes, so expect some variance in the results.

Thanks to blockexplorer.com for use of their network statistics.

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