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1  Bitcoin / Mining / Re: What's up with all the DDoS? on: June 10, 2011, 08:57:28 PM
Slush's pool AND Deepbit are both getting hit big-time, repeatedly, with Distributed Denial of Service attacks!

What gives?


1. target ~65% of aggregate mining pool with hired zomB net DDoS
2. Continue to mine your own 20-50 Ghash minifarm solo
3. Increase personal likelihood of mining whole blocks by factor of 1000
4. Profit

Your probability is based on the difficulty not the current global hash rate.  You would need to run #1 long enough (2 weeks) to affect a difficulty decrease so #2 is profitable
2  Bitcoin / Bitcoin Discussion / Re: How much Network Hashrate until we have a safe currency? on: June 05, 2011, 12:55:37 PM
I mean big enough so a coordinated attack by some huge network or in example if some big banking cartels want to bribe 3 or 4 major pool mine owners to give full control of their network wouldnt be possible to corrupt and screw all up?

Sorry if im saying nonsense but i wanna understand better how the network survive if such attack occurs because thats the modus operandi of the plutocracy since 1700s so its not unusual to think they will try to control the majority of the supply of this currency.



The bitcoin network currently has more hashing power than the top 500 super computers COMBINED.  I think it is pretty safe.  It would be safer if everyone was solo mining instead of pooling.   The attack vector is not on bitcoin itself it is on the pools
3  Bitcoin / Bitcoin Discussion / Re: We Now Accept Bitcoin for FX and gold trading on: June 04, 2011, 11:31:47 AM
FNIB is not affiliated with Mt Gox.

FNIB does not accept Paypal/Moneybookers but Bitcoin will be accepted directly.

How does it work?  Open your trading account with a Bitcoin payment.  Your account will be credited in USD at publicly available Bitcoin exchange rates on that day.  Trade FX.  When you want to cash out, Bitcoin will be sent back to you at that day's exchange rate.  

Note that Bitcoin itself is not traded on the platform.


www.fnib.co

So,  BTC in and out?  So if I put 1000BTC in last week ($8/BTC) I would get 8000FX,  Trade that for a week and get 20% increase then transfer 9600FX back to BTC ($14/BTC) = 685 BTC.   I think I'll keep my BTC thank you.
4  Bitcoin / Pools / Re: BTC Guild - 0% Fees, Long polling, SSL, JSON API, and more [~500 gH/sec] on: June 03, 2011, 07:05:43 PM
Parsing through about 2 million lines worth of logs right now after running a sample on the first 5 minutes.  Will likely be banning some IPs based off what I saw in the 5 minutes (people with over 1000 requests for work but less than 10 results sent back, some with 0).

How about deny everything and have people enter their worker IPs when they setup workers.  Then just open up the source IP for each worker.

5  Bitcoin / Mining / Re: GPU load when pooling? on: June 03, 2011, 06:35:24 PM

I upgraded to SDK2.4,  I don't think that helped with mining but it fixed some aticonfig stuff.

I updated my poclbm command line

./poclbm.py -d0 --host=btcguild.com --port=8332  -v -w 256 -r 10 AGGRESSION=12 BFI_INT > /tmp/gpu0&
./poclbm.py -d1 --host=btcguild.com --port=8332 -v -w 256 -r 10 AGGRESSION=12 BFI_INT > /tmp/gpu1&

I'm now overclocked to 950Mhz and running 333MH/s/GPU @ 97% GPU

One 6970 was DOA so that will be swapped out on Monday, hopefully my power supply can handle all 3

Adapter 0 - AMD Radeon HD 6900 Series
                            Core (MHz)    Memory (MHz)
           Current Clocks :    950           1375
             Current Peak :    950           1375
  Configurable Peak Range : [500-950]     [1375-1450]
                 GPU load :    98%

Adapter 1 - AMD Radeon HD 6900 Series
                            Core (MHz)    Memory (MHz)
           Current Clocks :    950           1375
             Current Peak :    950           1375
  Configurable Peak Range : [500-950]     [1375-1450]
                 GPU load :    97%

Adapter 0 - AMD Radeon HD 6900 Series
            Sensor 0: Temperature - 69.00 C

Adapter 1 - AMD Radeon HD 6900 Series
            Sensor 0: Temperature - 67.00 C


still nice and cool @ 100% fan speed
6  Bitcoin / Mining / GPU load when pooling? on: June 03, 2011, 04:00:34 PM

I just set up my new miner following the ubuntu guide.  I have 2 x 6970s. 

I'm running headless
I'm running poclbm.py like this:

./poclbm.py -d0 --host=btcguild.com --port=8332  -v -w 128 -r 10 > /tmp/gpu0&
./poclbm.py -d1 --host=btcguild.com --port=8332  -v -w 128 -r 10 > /tmp/gpu1&

(username & password removed).

I'm getting between 150M - 250M H/s on each gpu.  seems to be bouncing around quite a bit.

My GPUs are running about 50%, is that due to the pool?  Is there anything I should do to bump the GPU usage closer to 100%?

Adapter 0 - AMD Radeon HD 6900 Series
                            Core (MHz)    Memory (MHz)
           Current Clocks :    925           1375
             Current Peak :    925           1375
  Configurable Peak Range : [500-950]     [1375-1450]
                 GPU load :    38%

Adapter 1 - AMD Radeon HD 6900 Series
                            Core (MHz)    Memory (MHz)
           Current Clocks :    925           1375
             Current Peak :    925           1375
  Configurable Peak Range : [500-950]     [1375-1450]
                 GPU load :    59%

Adapter 0 - AMD Radeon HD 6900 Series
            Sensor 0: Temperature - 59.50 C

Adapter 1 - AMD Radeon HD 6900 Series
            Sensor 0: Temperature - 60.00 C


                                                                                   
7  Bitcoin / Mining / Re: Disappearing solo miners on: June 01, 2011, 10:13:16 PM
Quote
You should earn .05% of the total coins generated over a given time period. (2,628,000/year * .05% = 1,314coins/year)
While I appreciate your response, it seems like you may have misunderstood my question.

If you're mining solo, you don't get .05% of the total coins generated over a given period of time. Bitcoin is a discrete system, and you are only rewarded if you generate a block, at which point you get 50 BTC (or less, in the future). On top of that, the probabilities change every 2016 blocks because of difficulty changes.

Yes you do.  Over time it will average out to your percentage of hash rate towards the global hash rate.   You'll get nothing for a long time then get lucky and get 50.  over a couple years time it will average out.   The probability doesn't change.  Difficulty is another way of saying global hash rate.  As the global hash rate goes up the difficulty goes up to try to get 1 solution every 10 minutes.   Global hash rate goes up your percentage goes down.

So imagine this example scenario: The difficulty just changed to 434883, which means that each time one of your miners performs a Bitcoin hash (sha256[sha256[data]]), you have a 5.4e-14% chance of it meeting the Target and rewarding you with a tasty 50 BTC prize.

Now, for 2016 blocks after that, you end up being very unlucky, and generate no blocks at all. 2016 blocks having passed, the difficulty rises to 500000. Now your probability changes to 4.7e-14%. Just because you spent all that work in the past 2016 blocks doesn't make it more likely that you'll generate a block. It's all independent. So what does that mean? It means all your work was wasted, and now it's more difficulty to generate a block. You could have left your machine off for two weeks, and gotten the same results.

Yeah you could have left your machine off for two weeks, or you could have been very luck and solved all 2016 blocks.  It is all chance.  Your machine is just rolling the dice a couple billion times a second and hoping your numbers come up.   The rolls in the past have no bearing on the future rolls.

Contrast that with having been in a pool for 2016 blocks. You would have gotten paid foryour work during that difficulty period.

Now, again, I was terrible at statistics in college, so someone more versed in it will have to correct my (probably obvious) mistakes. It's the discontinuities that difficulty changes introduce that throws me off, really.

OVER TIME a solo miner will generate the same amount of coins as a pool miner that has a 0% charge.    Pooling gives you a steady but small amount of coins and solo gives you nothing for a long time and then bam! 50.

Your chances of solving go down equally when the difficulty goes up whether you are pooling or solo.


8  Bitcoin / Mining / Re: Disappearing solo miners on: June 01, 2011, 07:21:46 PM
While we're on the subject, perhaps someone can help me understand one aspect of solo mining I haven't had the chance to personally explore. If your 95% probability solo mining time is >2 weeks, for example, will the difficulty changes ultimately have an adverse effect on your income? Statistics was never my strong suit.

 Income% in coins is  your hash rate as a percentage of the global hash rate. I% = mH/gH.   If you are kicking out 2GH/s and the global hash rate is 4TH/s you are .05% of the total network hash rate.  You should earn .05% of the total coins generated over a given time period. (2,628,000/year * .05% = 1,314coins/year)

Difficulty is just a different way to measure the global hash rate.  As gH/s goes up so does the difficulty and I% goes down.

A pools percentage is poolHash / globalHash (pH/gH).  Your poolIncome% = mH / pH.

If your 2GH/s is part of a 1TH/s pool you are 0.2% of the pool
The pool is 25% of the global hash rate (4TH/s).
The pool would earn 25% of all generated coins and you would get .2% of that  (.05%) less any pool overhead charges.

over time solo mining will win out unless you have a 0% cost pool.  with solo mining you could just have a very long dry spell.

If you are running multiple solo miners you are better off pooling them so they don't generate duplicate work.
9  Bitcoin / Bitcoin Discussion / Re: Bitcoin services under attack? on: May 31, 2011, 12:46:35 PM
If there is enough disruption in the pools for a couple weeks would the difficulty drop?   How much of the total network  hash rate is made up in pools?
10  Bitcoin / Mining / Re: What do I need to start a pool on: May 29, 2011, 01:45:14 PM
Expect to use in excess of 1TB of bandwidth a month.


Bandwidth isn't a concern I have a couple GigE circuits available with 200-300mbps of spare capacity.

Wondering if there was a web/PHP/MySQL setup already to run the pool or will I have to re-invent the wheel.
11  Bitcoin / Mining / What do I need to start a pool on: May 29, 2011, 01:05:08 PM

Is there a pool starter kit? 

What kinda hardware & bandwidth would I need to run a good pool?

Is there a need for another good pool?

What % would be acceptable for the pool to keep? I've seen some 0% pools but they aren't very stable.
12  Bitcoin / Bitcoin Discussion / Re: USD in circulation ? OK ... now divide by 21million on: May 26, 2011, 11:50:48 PM

I think it is more like [World GDP in US$] x [% of BTC acceptance] / 21 Million

World GDP = $52.9 Trillion [1]  (2009)

So lets say BTC takes over 0.01% of the world economy

$52.9T * .0001 = $5.29B / 21M = $251.90/BTC

[1] - http://www.google.com/publicdata?ds=wb-wdi&met_y=ny_gdp_mktp_cd&tdim=true&dl=en&hl=en&q=world+gross+domestic+product
13  Bitcoin / Pools / Re: BTC Guild - 0% Fee Mining Pool (Long polling, JSON API) [~160 gH/sec] on: May 25, 2011, 07:24:21 PM

Bit of bad luck today to make up for all the good luck we've been having.  Hopefully with the new dedicated hosting provider this weekend, we can surpass 250 gH/sec by the end of the month.  The current hardware will probably stop keeping up around that point.

What type of hardware/bandwidth are you running this on.  I would consider hosting the pool on some dedicated hardware in my datacenter (2 GigE of bandwidth). I'll even accept BTC for payment Wink
14  Bitcoin / Mining / Which OS is best for OpenCL mining? on: May 25, 2011, 03:22:52 PM
Ok, so I have a new miner rig on order.  AMD CPU, 3x6990s, 4 Gig RAM, 30 Gig HDD.  I too the recommended list of parts from the wiki.

What OS should I use?  I would rather use Linux (which flavor) but will run Win7 if that is what gives the best performance.

My plan is to run it headless stuffed in a corner of my office and just let it crank away 24/7.

My cost was about $400 less than NewEgg buying direct through my distributor.  The 6990s are on back order but they should ship next week, just in time for the difficulty increase :/

15  Other / Obsolete (selling) / What services are needed by the community? on: May 23, 2011, 02:14:06 PM
I own/operate a small ISP/Telcom provider.  I'm interested in selling some of my services for BTC. 

Is there a need for:

online backup service
webhosting (Plesk CP)
email hosting (Plesk CP)

If so, how much $BTC should I charge for each month/year of service?

16  Economy / Economics / Re: How to discourage hoarding - brainstorm on: May 19, 2011, 07:09:55 PM

In the event of massive hoarding couldn't we just establish a 2nd IRC channel and issue a 2nd genesis block?  That would start the chain for 21 Million more coins.  There would need to be an exchange between the two different coin generations but that isn't any different then the bitcoin to flat currency exchanges today.
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