Hi,

*edit: cgminer extranonce.subscribe extension is now confirmed to be working, therefore this OP was modified with links to actual binaries (universal windows for some USB miners and binaries for AntMiner S1, S3 and Spondoolies SP20):

*edit 2015-02-25: cgminer extranonce.subscribe extension is now included in AntMiner S5 and Spondoolies SP20 and SP3x firmware, so all you have to do is update your firmware and add #xnsub at the tail of stratum connection string

https://www.nicehash.com/index.jsp?p=software#cgminer

Source is available here: https://github.com/nicehash/cgminer-ckolivas, so maybe someone could make binaries for some other ASIC devices as well.

When you test it, make sure you add #xnsub at the end of the stratum connection string to enable extranonce subscription:

cgminer -o stratum+tcp://stratum.nicehash.com:3334#xnsub -u enterYourBTCaddress -p x

When your miner successfully connects, take a look at the miner stats page:

https://www.nicehash.com/index.jsp?p=miners&a=1&addr=enterYourBTCaddress

and make sure you see extranonce subscription confirmation:



Feedback appreciated. Please report if you have any success and if all is fine we will propose to push this feature in other cgminer forks and from there it will hopefully made its way into various ASICs firmwares...

Thanks!

Looking for cgminer beta testers with extranonce.subscribe support on SHA256 miners (for optimal mining performance - no disconnects)

extranonce.subscribe support made it into sgminer quite some time ago, but not yet into latest cgminer version. We prepared an implementation which would hopefully made it into the official version, but we need some testers first.

If you are still using some older miners, connected via USB, we are looking for users to test with these devices:

--enable-avalon
--enable-avalon2
--enable-bflsc
--enable-bitforce
--enable-bitfury
--enable-blockerupter
--enable-cointerra
--enable-drillbit
--enable-hashfast
--enable-hashratio
--enable-icarus
--enable-klondike

If you own one of these devices we welcome you to test this cgminer binary: https://www.nicehash.com/software/cgminer-4.7.0-extranonce.subscribe.zip

make sure you add #xnsub at the end of the stratum connection string to enable extranonce subscription:

cgminer.exe -o stratum+tcp://stratum.nicehash.com:3334#xnsub -u enterYourBTCaddress -p d=128

When your miner successfully connects, take a look a miner stats page:

https://www.nicehash.com/index.jsp?p=miners&a=1&addr=enterYourBTCaddress

and make sure you see extranonce subscription confirmation:



Please report if you have any success and if all is fine we will propose to push this feature in official cgminer and from there it will hopefully made its way into various ASICs firmwares...

Thanks!

Job done.

We added NeoScrypt algo to NiceHash/WestHash. Sellers, make sure to use latest Sgminer 5.0 develop version, since cgminer-neoscrypt 3.7.8 has extranonce bug (you will only receive "Share above target" with cgminer-neoscrypt 3.7.8 on our stratum servers)!

Sgminer 5.0 develop source: https://github.com/sgminer-dev/sgminer/tree/develop

Sgminer 5.0 develop windows binaries: http://cryptomining-blog.com/3735-new-sgminer-5-development-version-with-neoscrypt-support/

BTW: it took as a bit longer to implement proper validator because we were testing on cgminer-neoscrypt 3.7.8 and only today figured out that the issue is with the extranonce bug in cgminer-neoscrypt 3.7.8 ... we really don't understand why they even used such an old buggy version of cgminer for neoscrypt implementation ... bwah!

MultiAlgo users : either update to Sgminer 5.0 develop or disable NeoScrypt factor until you update to this miner. You can disable a particular algorithm by setting f8=0 .... for example f0=1;f2=0.5;f3=4;f4=3;f5=500;f6=3.5;f7=16;f8=0 ... more info on https://www.nicehash.com/multialgo/#finetuning (of course, since NeoScrypt is very profitable, we suggest you to upgrade to latest Sgminer 5.0 develop as soon as possible).

Here are some key settings for Sgminer (of course, your mileage may vary):

NeoScrypt algo added. Sellers, make sure to use latest Sgminer 5.0 develop version, since cgminer-neoscrypt 3.7.8 has extranonce bug (you will only receive "Share above target" with cgminer-neoscrypt 3.7.8 on our stratum servers)!

Sgminer 5.0 develop source: https://github.com/sgminer-dev/sgminer/tree/develop

Sgminer 5.0 develop windows binaries: http://cryptomining-blog.com/3735-new-sgminer-5-development-version-with-neoscrypt-support/

BTW: it took as a bit longer to implement proper validator because we were testing on cgminer-neoscrypt 3.7.8 and only today figured out that the issue is with the extranonce bug in cgminer-neoscrypt 3.7.8 ... we really don't understand why they even used such an old buggy version of cgminer for neoscrypt implementation ... bwah!

MultiAlgo users : either update to Sgminer 5.0 develop or disable NeoScrypt factor until you update to this miner. You can disable a particular algorithm by setting f8=0 .... for example f0=1;f2=0.5;f3=4;f4=3;f5=500;f6=3.5;f7=16;f8=0 ... more info on https://www.nicehash.com/multialgo/#finetuning (of course, since NeoScrypt is very profitable, we suggest you to upgrade to latest Sgminer 5.0 develop as soon as possible).

Here are some key settings for Sgminer (of course, your mileage may vary):

A few particular ASIC miners have higher reject ratio, but not because of their high speed, but because of either bad software implementation (most of the time issues with handling flushwork or issues with bugs in older cgminer versions) or because weak controller board CPU is used. All these issues arise due to the fact that Orders on NiceHash are usually mining altcoins with low diff, fast blocks and quick diff change ... and some miners simply can't handle this properly (poor implementation from the ASIC miner manufacturers).

Unfortunately AntMiner S2 is know to have such issues. You can try to use stratum-proxy (https://www.nicehash.com/software/#asic) and see if you get better results. btw: other Antminers (S1, S3, S4, etc.) are known to work good. We have no experiences with Spondoolies SP35, but as far as we know these are high-quality miners and should work fine ... if any user is currently using SP35 please leave feedback here.

The same as Scrypt (ckolivas, zuikkis, etc.), just set "nfactor" : "11"

{
   "name" : "NiceHash_Scrypt-N",
   "url" : "stratum+tcp://stratum.nicehash.com:3335",
   "algorithm" : "zuikkis",
   "nfactor" : "11",
   ...
},

btw: there seems to be a Scrypt-N "rush hour" at NiceHash currently

It's really a small job, but if you would require escrow we can do it, no problem. You can also check our Trust for some small already finished jobs (https://bitcointalk.org/index.php?action=trust;u=362449) and of course our regular payments to our customers https://www.nicehash.com/index.jsp?p=miners&payments.

We are looking for a programmer to make NeoScrypt validator ... easy money: https://bitcointalk.org/index.php?topic=848256.0

You heard the Wolf (full moon is tomorrow ) ... easy money: https://bitcointalk.org/index.php?topic=848256.0

*edit*: Job done!

The job is basically fairly simple. You need to provide a function, coded in C (copy-paste & merge code from existing miners, for example cpuminer-multi - https://github.com/wolf9466/cpuminer-multi, or https://github.com/vehre/neo-gpuminer) which takes input parameters from stratum (prevhash, coinbase, merkleroot, ntime, extranonce1&2, nonce,...) and returns share diff (double). We would include this function in our stratum-proxy server, used to validate shares for NeoScrypt algorithm. The code must compile under VS2010 (32bit mode C, not C++).

Here are the list of input parameters:

params[] = Hash of previous block. Used to build the header.
params[] = Coinbase (part 1). The miner inserts ExtraNonce1 and ExtraNonce2 after this section of the coinbase.
params[] = Coinbase (part 2). The miner appends this after the first part of the coinbase and the two ExtraNonce values.
params[][] = List of merkle branches. The coinbase transaction is hashed against the merkle branches to build the final merkle root.
params[] = Bitcoin block version, used in the block header.
params[] = nBit, the encoded network difficulty. Used in the block header.
params[] = nTime, the current time. nTime rolling should be supported, but should not increase faster than actual time.
params[] = ExtraNonce 2
params[] = nonce

We can send existing validators (C source files) where problem is already resolved for other algorithms (Scrypt, SHA...) - contact us via PM or @ info@nicehash.com if you are interested.

Of course you must test your function with some example shares - your algorithm should return the same diff as it is received, for example, by cgminer:



If you know the guy that implemented this stuff into the cpuminer-neoscrypt itself or some other programmers, that contributed to NeoScrypt algorithm, please forward them this job description.

We will pay 0.2 BTC for this job when done ... it is just some code copy&paste and testing. Contact us via PM or @ info@nicehash.com if you are interested.

Thanks.

No, everything should be running smooth ... "all over he place" ? ... send us your details to https://www.nicehash.com/?p=contact (your mining address, public IP, what kind of miners are you using) and we'll check it out.

Hmm, to be clear: we have not paid this, as said before, we can't negotiate with the attackers since this usually results into never-ending story.

Also, CloudFlare is doing a fairly good job, purely HTTP-based attacks are quickly mitigated. These attacks weren't targeted at our web portal, but on our stratum servers - these are harder to protect (there is no public solution such as CloudFlare for stratum protocol). The issue is that our service is tightly integrated into our stratum servers, therefore sometimes when stratum servers are being hit too hard, web fronted also becomes unresponsive ... keep in mind that this is not just an ordinary pool but an advanced stratum-based service.

Thank you for your support!

We are currently being hit by 8+ Gbps DDoS attack which is not so easy to mitigate ... we'll keep you updated when we'll have more information available.

Hi,

As you have seen we've been under massive DDoS attacks in the past days. Once again, these are classical extortion DDoS attacks. We are able to mitigate DDoS by network filtering, however, protection and filtering also blocks some good traffic (miners), unfortunately. Attacker is probably attacking by bots. We have gathered some useful data and reported attacker to FIRST (http://www.first.org/) and TF-CSIRT (http://www.terena.org/activities/tf-csirt/). We are not negotiating with attackers and hopefully they will at least have a restless and disturbed sleep while the security incident groups are trying to identify them. If anybody has any info about these attackers (they are also attacking other pools) we will reward any useful information.

Thank you for understanding and thank you for using our service!

KnC haS to improve their firmware for much better flushwork handling ... Until they fix this basically no multipool or altcoin pool can't work efficiently (multipools that are currently somehow working are separating work and actually redirects Titans to only LTC mining behind the scenes) ... See also this: http://forum.kncminer.com/forum/main-category/main-forum/64472-nicehash-full-support

Corrected.

There is a small change or better say additional optional request. Instead of implementing "--extranonce-subscribe" parameter it would be much better if you could implement extension in the same way as it has been implemented in BFGminer - in this case one would simply add "#xnsub" at the end of the pool URI to enable extranonce subscribe (for example stratum+tcp://stratum.nicehash.com/#xnsub). This is important because it enables the user to set this without modifying configuration (in some cases ASIC devices won't allow you to set cgminer configuration), also, this enables user to enable extension on a per-pool basis thus not use this extension on pools that does not support extranonce subscription. Please revise the BFGminer implementation and let us know if you could implement handling of extensions the same way BFGminer does (since BFGminer and cgminer are somehow similar maybe you could even reuse some code). If this is doable and you could implement "#xnsub" to be added at the end of the pool URI instead of "--extranonce-subscribe" option, we are willing to rise the payment to 1 BTC.

We had a short issue with our EU servers and some orders weren't processed. We have issued refunds for all incomplete orders. As usual, ask for support regarding issues with orders on info@nicehash.com rather on these forums. Thank you for using our service!

Unfortunately AntMiner S2 is know to have issues with our stratum servers due to a specific version of cgminer used in it which has a bug regarding handling of extranonce2 (as used in our stratum servers). You can try to use stratum-proxy and see if you get better results. btw: other Antminers (S1, S3, S4, etc.) are known to work good