Quote from: eleuthria on February 18, 2016, 07:07:39 PM

Quote from: Herv12 on February 18, 2016, 06:03:59 PM

Quote from: slush on February 17, 2016, 09:29:51 PM

Maybe you noticed the pool website now redirects to https://slushpool.com. The URL is legit, we've been lucky enough to obtain this nice domain and we just moved there from more complicated "mining.bitcoin.cz". Back in 2010 I did not realize how big the mining industry will became, so I choose just a subdomain of my Czech bitcoin blog :-).

This is just about the website, no change in miner settings is needed as we keep all mining URLs to work normally.

Hello Slush,
Thank you for that but maybe you have most important things to do,... like auto-detecting block withholding for exemple!

If I'm not mistaken it was you who designed the stratum protocol?

I'm not very knowledgeable of how it works, but I asked myself the following question:
Is it possible to send a job that has already won a block to all the miner (the same work) for example once a day to check that every miners solve the solution. it only cost a few seconds but would help to find block withholding problems?

This isn't possible. In Stratum, each miner has a unique ExtraNonce1 value which means giving every miner the exact same job (which is what Stratum does already) will result in different hashes from every miner. There is no way around this, since if you added a feature to Stratum that forced an ExtraNonce1 change for work verification, the withholder would KNOW they're being tested.

WELL thats great in my eyes.. Then we narrow down who it is.. lock down creating new users so they cant keep swapping users and perform the test every two weeks or less.. If im going to lose 30% earnings for 4 months in a row then i think some countermeasure is needed.. I dont mind throwing away a few seconds of mining to test this theory.. Personally i think there is nefarious reasons why this hasn't been implemented Already and i don't know why you would oppose this eleuthria.. Since we know your pool was obviously victim to it before it shut down.. If i remember right it was nearing 80 % as well and dropping.. these miners need caught their ips made public and lets work on getting this resolved.. I know that you can make this work and send old block solutions to the miners to test them for withholding.. If a miner drops off when the tests are performed they are flagged as suspect then they are tested even harder. Till they get with the program or they are permanently banned.. I think with this becoming a big issue and the hw becoming more efficient making this attack easier and less costly we have to get something in place.. Maybe the reason this hasnt been done will be used in the future to screw all the public pools and force everyone solo or die. Lets work together .. stop the bickering of my pools better then yours and come together as a whole and lets try to fix this.

Best Regards
d57heinz

EDIT and the community would prefer you kept quiet on whether you got it to work or not.. No need to let the attacker know he is being watched.. THATS how you get it done.. Dont update the source code till after you have "tested" it Wink