Do you want to buy Antminer S9k? please don't, you will lose your money, I have just finished writing a topic about this a while ago, read through it, but long story short, DO NOT BUY THEM, THEY ARE SHIT.

if you don't have stable voltage and you have to get S9, at least get the S9e version, or find used S9i/S9j in your country.

I can't say these are used, maybe refurbishment or haven't passed their quality control, I hate Bitmain for doing this but I have to be honest in my complain/review.

The gears seem and smell brand new, despite that some have different heat sinks colors I doubt these are used, at lease the once i tempered with attempting to fix them.


Yes.


I don't have to go that far, a single email is more than enough to get them to "admit their mistake" and ask me to ship the gears back to them, which is not an option as i have explained in the OP.


There is nothing wrong with buying used gears if they are labeled as "used",  selling brand new miners and sending used once is another story, but as I have explained, I can't confirm that gears are used, they might be, but if that is the case then Bitmain did an amazing job making them look like brand new.


It's nothing too serious, I think I had worse stuff happen to me before,  I am glad they weren't S17+ or anything like that.


I now have a good amount of PSUs sitting there doing nothing, so next step would be sourcing S9s without PSUs and/or sell them along with the control boards, they don't worth much, but still better than nothing.


I remember having a similar issue "on a smaller scale", it was an S9i IIRC, They refused to give me any coupons let alone credit, and asked me to send the miner back to china, after a few emails back and forth, they suggested that I send only the faulty hash board, which doesn't make any sense now given the cost of the miner.

الامر ليس مزعج للعنين فقط بل يسبب الالم والحرقان عند اطالة النظر





مثل هده الافعال قد تسبب في nuke للحساب وليس فقط ban حيث ان الحساب باكمله متظمننا كل منشوراته سيتم ازالتها نهائيا من المنتدى واعتقد ان هدا الحل الامثل ان لم يتوقف هاؤولاء عن النشر بهده الطريقة, اتمنى من المشرف ان يقوم بعمله بصورة افضل وايضا يجب مساعدته من قبل الاعضاء عن طريق التبليغ عن كل تلك المنشورات.

The s9 series are coming to an end for most people, yet they still hold some value to those with free or cheap electricity.

I had a few spots to fill in a small farm where voltage is not regulated and S9s were the only option, I wanted "brand new" miners so S9k was the only option among the S9 family.

I went ahead and ordered the S9ks from bitmain after trying 2 of them for a while and they worked just fine for a while, the new batch was very terrible and the rest of the story is even worse.

almost half of them lost a board after running for a few days, the once that didn't lose a board did not perform any better, many issues started to show up, they hang, stop hashing, keep rebooting or not reflecting the actual hashrate on the pool side (20-30% less).

It does not end here, these miners are so bad that some of them came like this.



I am so mad I want to write more to express my anger, but I will just stop here  

Please note.

1- There are other S9s running in the same place (S9,S9i,S9j) they all are working great.
2- Internet connection is very stable and there is more than enough bandwidth .
3-The place is cool, air ventilation is good.
4-I tried all possible firmware on them, the newest one dec 2019 fixed the temperature reading issue and that's all about it.

The infrastructure is perfect, so there is a zero chance that I can blame anything but Bitmain for this, I can't send those grears for RMA as it costs more to ship them back than they worth.

TL;DR DON"T BUY ANTMINER S9K

I have seen some crazy projected difficulty adjustment, but nothing like this before



https://diff.cryptothis.com/

we are 160 blocks ahead


from https://btc.com/

we are doing 1 block a minute, 2 blocks a minute at some points!, not sure what is actually happening, but am sure we will slow down big time, let's wait and see how things go.

If you confirmed that all 3 hash boards work just fine, i think it would be best to buy a new PSU, for two main reasons. First one is this PSU is not good and it could damage the hash boards eventually, so there is a good amount of risk in keeping it. The second reason is economically based, T17 40th makes about 6.3$ a day (before electricity bill) so every board makes a good 60$ a month, T17 PSU costs 134$, say 30$ for shipping. you are looking at about 160$. If your power cost is 5 cents then PSU ROI will be about 5 months.

if you decide to keep on mining with only 2 boards, at least sell the other one that's sitting there doing nothing. Just 2 two sats.

بكل تأكيد اخي سي, ان كان عدم الاستتمار خسارة فأن الاستتمار الغير المدروس يعرضك للخسارة مرتين, الاولى عند البيع بخسارة (خسارة جزء من مالك) والتانية هي خسارة القوة الشرائية من اموالك.

لابد من وجود قناعة وادراك تام بما يفعله الشخص وليس فقط اتباع مايفعله الغير, يمكن لشخصين ان يستتمرو في نفس الشي في نفس اليوم , قد يصبح احدهم غني يوما ما بينما يخسر الشخص الاكل شي استتمره , من وجهة نظري القاعدة الاولى في الاستتمار في مجال البتكوين هي "النفس الطويل" اي شخص لايمكنكه انتظار استتماره لخمس سنوات او اكثر ولا يستطيع تحمل رؤوية استتماره يخسر 90% من قيمتها يوما ما قبل ان يصعد مجددا, عليه ان لا يستتمر في البتكوين.

ولكن في كل حال يجب عليه الاستتمار في اشياء اخرى, حتى لايقع في نفس الدوامة التي ذكرتها انت "من كان يملك الملايين ويجمدها على شكل أموال دون استثمار حرفياً أصبح تحت خط الفقر"

OP you should really pay close attention to this, switching coins is really bad for your miner, I heard this elsewhere before and I thought it was a complete bullshit until I experienced it myself, it was not with any SHA256 miner but with X11 and a couple of D3s, more than 50% of the hashboards that were mining on nicehash stopped working, the miners that were pointed to another pool mining dash directly lived a lot longer.

I have no technical explanations behind this, I am having a hard time saying this because it's hard to believe, I couldn't believe it when I heard it because it made no sense then, still makes no sense now to be honest, you either take my words for it, or simply ignore them.

المشكلة تكمن في ان عدم الاستتمار ايضا مليء بالمخاطر ! , انظر على الصورة في الاسفل




هده الصورة تمتل القوة الشرائية للدولار مقابل الذهب منذ سنة 1965 حتى 2010 اي اقل من 45 سنة (الوضع الان اسواء) ولكن يمكن الاكتفاء حتى بالارقام الموجودة في عام 2010, لاحظ ان الدولار فقد اكثر من 85% من قوته الشرائية اي فقد هبط من 100 الى 15 تقريبا, مما يعني ان الشخص التي احتفظ بي 1000$ من عام 1965 , تلك القيمة اصبحت في الواقع 150$.

لناخد مثال بسيط بما يتماشى مع الارقام اليوم , لنفرض ان قطعة ارض اليوم تساوي 1000$, بعد 45 سنة نفس قطة الارض ستكلفك 6666$ , ولاننا لانستطيع ان نأكل العملات ولا ان نلبسها ولا ان نسكن بها فالقوة الشرائية هي المهمة وليس القيمة في حد ذاتها.

لاحظ الفارق لشخص احتفظ بالذهب بدلا من الدولار ! , طبعا لا ننسى ان الدولار الامريكي يعتبر افضل من معظم العملات , فما بالك عملاتنا الرديئة في الدول التي نعيش فيها.


عدم الاستتمار في حد ذاته يعتبر خطر ومن وجهة نظري "غباء", طبعا هدا لا يعني ان البتكوين او الكريبتو هي الشي الوحيد الذي يمكن الاستتمار فيه, يوجد المعادن الثمينة مثل الذهب والفضة, اسهم الشركات الناجحة, الاراضي, العقارات  ووو , مايميز الكريبتو هوا صغر حجم السوق, وان العائد بكل تأكيد اكبر من الاستتمارات التقليدية, طبعا الخسارة ايضا اكبر.

لذلك ان انصح اي شخص بالاستتمار في البتكوين, ولكن الاستتمار يجب ان يكون مدروس وان يتم على مراحل لا تقل عن سنة في اقل تقدير, مثلا ان كان لديك 1000$ قسمها على 12 شهر واشتري كل نهاية شهر بقيمة 83$ مثلا. بهده الطريقة تضمن انك لم تشتري في القمة وانك تمكنت من الحصول على متوسط سعري يعزز فرصك للكسب في السنوات  القادمة.

This is a good sign that all 3 boards are still good, here are the three possible reasons.

1- Voltage:

if you are not feeding the miner with 200-240v it could act weird and not be able to power on 3 hashboards.

2-PSU is dying:

Due to unregulated voltage or simply bad luck, the PSU can't feed enough power for all boards

3-The data-cable

Make sure you test all three of them by swapping them.

also can you tell us what is the exact voltage you plugging the miner to? please notice these new gears take voltage very seriously, anything above 240v or below 200 vots is simply a free ride to RMA.

القاعدة العامة للسعر مرتكزة على الطلب والعرض , كلما زاد العرض نقص السعر (والعكس صحيح) وكل مازاد الطلب زاد السعر ( والعكس صحيح) , التصنيف او ال halving له علاقة مباشرة بالركيزة الاولى وهي العرض.

انا قمنا بتجاهل العرض المتاح (القديم) والاستناد على العرض الجديد (اليومي) الذي يأتي من التعدين نعرف انه في شهر مايو المقبل سوف ينخفض العرض الجديد من 1800 بتكوين يوميا الى 900 بتكوين يوميا, مما يعني انه وفي حال كان الطلب تابت سعر البتكوين سيزيد , وفي حال زاد الطلب السعر سيزيد ايضا, وفي حال نقص الطلب السعر سينخفض بوثيرة اقل مما كان سينخفض بها لو كان العرض 1800 بتكوين يوميا.

هدا الامر منطقي جدا, ولكنه يتجاهل عاملين اتنين

1- احتمالية انخفاض الطلب

في حال انخفض الطلب للنصف, يصبح تأثير التصنيف تقريبا 0

2- العرض القديم وهوا حاليا 18,162,512 بتكوين , نحن لا نعرف ان كان هناك كميات من العرض الموجود مسبقا ستعرض للبيع وتقتضي على تاتير اختفاء 900 بتكوين يوميا.


منطقيا والاقرب للواقع من النواحي الحسابية هوا ارتفاع السعر, عمليا كل شي يمكن ان يحدث , وجهة نظري حول 2020 انها لن تكون سنة جميلة بل العكس تماما, واتمنى ان اكون مخطي.

That function ensures the previously received outputs were sent to the same hash ( address) that is trying to now spend the outputs.

When Alice creates the scriptPubKey she locks those outputs to Bob's public key, those outputs can only be re-sent/spent by unlocking this script. Once Bob wants to send to Sara he will take that output and create his own ScriptPubkey, technically using Alice's outputs.

 OP_EQUALVERIFY ensures that both hashes (public key address) from Alice's output which now Bob's input to Sara are equal (both hashes belong belong to Bob).

اولا شكرا على مجهوداتك القيمة التي وضعتها لكتابة هدا الموضوع، في الواقع لقد تم الحديث عن هدا الموبايل في موضوع اخر منذ فترة

https://bitcointalk.org/index.php?topic=5208358.0

لامشكلة ولكن حاول ان تبحت في قائمة المواضيع القديمة قبل انشاء موضوع جديد، ويمكن الاكتفاء بالتعليق على الموضوع الاول بدلا من كتابة موضوع جديد في حال وجوده، حتى نحافظ على المظهر العام والتنسيق في القسم العربي.

شكرا وتقبل مروري.

مرحبا بعودتك اخي خالد، لن اقوم بحصر رتب المشاركة كما ذكرت، ومشاركة الجميع متاحة ومطلوبة في الواقع، انت ايضا اخي ulven سيكون عليك المشاركة بدون اعذار  .

سنبداء المسابقة يوم الجمعة بعون الله، سأترك لكم هدا الموضوع مفتوح للادلاء باي اقتراح تجاه الشروط، لديكم اليوم كامل لفعل هدا، اتمنى منكم اقتراح الشروط وتعديلها ان كان لديكم اي ملاحظات حولها.

بالتوفيق

No!

Only A executes that script, the nodes verify it and tell B that the script is valid and that now B is the new rightful owner to those outputs.

B does not need to verify anything for the transaction to go through, once his pubkey is known, he has no saying on whether A can send him some bitcoin or not.

if A has the outputs to send, and he can sign them to prove his ownership, and he uses a correct address to send to, the nodes will allow the transaction to go to a mempool and then miners will add it to the block and it gets confirmed.

If you still don't get it, you should learn more about what nodes actually do.

I think I understand where the confusion comes from after reading your reply to my last post, I think it all goes down to the lack of understanding of basic cryptography, public and private keys encryption in general.

You think that Sigscript is private information that can be used to spend bitcoin if revealed to others, allow me to explain this in a much simpler way.

Think about it this way, Alice is writing a check for Bob, Alice's signature (scriptSig) is PUBLIC information which everyone in the bank knows, but they all can't make an exact similar one, Alice writes Bob's account number (scriptPubKey) on the check, that account number is PUBLIC information.

You might wonder how can these information be PUBLIC yet nobody can create them except for Alice? well this is what cryptography and hashing is all about

scriptSig(S) = Alice's Signature(A) + Alices's public key (P)

P = public
S=  public
A= Private

to create (S)  you must have A and P,  knowing S and P can't give you (A), it's like mixing colors, it's easy to know the color you get if you mix blue(A) and red(P), but looking at Fuchsia (S) you can't really tell what colors were mixed together to get that exact grade, unless you keep trying all different colors and ratios (brute force).

ScriptPubKey  = in a nutshell is (Bob's Bitcoin Address) which is the hash of a public key


Yes in my previous post,  I tried to explain how things work prior to Alice sending to Bob, because Alice needs to receive before she can send.



Input is the new form of a previous output, you take an output, Sigcript it and put it in an input , in other words

A sends BTC to B, then B sends BTC to C, then C sends to D

imagine that Input is a banana, output is the same banana but peeled.

A has a banana which he sends to B and call it input, B received the banana from A, peel it and call it output, If B wants to send the banana to C he needs to seal it again ( you can't send peeled bananas they become contaminated) once sealed- it's called input again, C receives the banana, peel it, and it becomes output.

so an input is nothing but signed output/s (UTXO)





A,B,C,D,E,F......Z can see the scripts but only B can spend them, if you refer to the check example I gave above, A writes a check to B , he can publicly send it via the mail to B, everyone sees a million dollar check signed by A and going to B, they all know the check is valid because A's balance which is public information is => 1 million $, B's account number is a valid account number which is also public information, ONLY B can now spend that 1 million dollars once he proves his ownership to that account number.

I hope that by now a bit of confusion is now gone, I also hope i haven't made it even worse for you.  

I think this is the his firmware which he now gives for free according to the information he added to the thread > https://bitcointalk.org/index.php?topic=5127323.0

Despite the doubts raised by respected member Kano, I for some reason think that thierry4wd was honest about not altering the bmminer (aka stolen and modified cgminer  ) and he somehow patched it and got full control over frequency and voltage, I tend to think that thierry4wd is a trusted member who puts a lot of effort for the mining community.

A short answer:

Every full nodes functions as if it's the only node out there, it trusts no other node, Alice and Bob's verification aka "their words for it" mean nothing to all other nodes, every full node needs to verify the transaction. The moment Alice broadcast a transaction she needs to provide the scripts for everyone else to validate. Unless Alice has a mining node and she includes that transaction in the block first, mine it and then broadcast the whole block and even then if the transaction is not valid-the other full nodes will reject the whole block.


In fact, nobody has the scriptPubKey and scriptSig except Alice, not even Bob! , Alice MUST include them in the transaction and broadcast it for the transaction to go through.


If you want slightly more detailed answer keep reading



To get a clearer understanding of how transactions work, you should first think of it this way: bitcoin does not travel from Alice's wallet to Bob's wallet because Bitcoin was never in Alice's wallets to begin with. All that Alice has is the private key needed to spend an x amount of unspent transaction output (UTXO).

The blockchain that each full node keeps a copy of has the information of every single unspent outputs out there.  Alice creates scriptSig to prove her ownership of that amount of bitcoin she wants to send and creates scriptPubKey which is in simple English is Bob's public key hash so that amount of UTXO can only be spent by Bob.

Bob will then undergo another scriptSig using his signature and public key to prove that the current inputs (previously outputs from Alice) actually do belong to him when/if he needs to spend them.

So Alice initiate the transaction and then broadcast it to the blockchain. Let us assume she uses Exodus wallet, the transaction will be first sent to Exodus's full node, it will verify it and if everything is in place, it will broadcast it to every node around it. Those nodes will broadcast the transaction to the nodes around them and so on; every node will verify the validity of the transaction before it actually is broadcasted. Eventually Alice's transaction will end up in a mempool of a mining node after that mining's full node has verified the transaction too (theoretically, it will end up in all mempools of all mining nodes aka mining pools running full nodes).

Up to this point, Bob can't spend the anything that Alice "theoretically sent" despite the fact that everyone knows by now that Alice gave up ownership on x amount of BTC to Bob, because if he tries to do so, his transaction will be invalided because the transaction does not exist in mined block (not in the blockchain).
In other words, it is only Alice's words to Bob that he will be able to spend those outputs; as long as it was not added to a mined block- it simply means nothing. Therefore, when one of the miner's picks Alice's transaction and add it to the block, Bob can then spend that bitcoin if he has the private key and can actually create a scripSig, because now (officially) the transaction is on the blockchain.

Full nodes validate transactions, Mining nodes write them on the Blockchain (after verifying them and picking the once that pay the most or the once they want to pick for whatever reason). For a transaction to be considered completed, it must be verified by full nodes and put in a block by a miner, BOTH must happen for Bob to be able to spend the BTC he received.

Using voltage stabilizer is indeed a great idea technical wise, do not listen to anyone who says otherwise.

Economically, using those stabilizers might not be a great idea, so I will leave it this way.

You also did mention you had a AVR3000, notice that most of those devices are rated in VA (volt*Amps) which is not exactly Wattage, at best case scenario you are looking at a power factor of 20% so you have to multiply that 3000*0.8 and you get 2400w which is noway near what Antminer T17e needs, you will need at least 3600-4000VA.


Changing the breaker won't fix the overheating issue, 20AMP MCB is the minimum safe size, however, just by replacing it - the wires won't run any cooler, you need to replace the wires from the 20amp breaker to the main breaker.

اوفقك في الشق الاول من تعليقك ولكن اعتقد انك بالغت قليلا في الجزء الاخير المقتبس, لايوجد اي خطر في مناقشة توقعات الاسعار من حيث التحليل الفني او قراءة الاخبار, بالعكس تماما, لولا مشاركة الافكار لما عرف معظم الناس عن التصنيف القادم مثلا, او الاخبار الجيدة والسيئة المتعلقة بالكريبتو.

الخطر في قنوات التليقرام وغيرها يقع في القنوات التي تقوم بعمليات البامب والدامب Pump and dump حيث يكون المشتركين ضحايا لاطماع اصحاب القنوات ويقع عليهم ال dump ويخسرون اموالهم, ولكن ان كانت القناة تناقش العملات واسعارها واخبارها بطريقة بعيدة عن النصب فلا باس, المشكلة تكمن في عدم وجود تلك القنوات وحتى وان وجدت وكان اصحابها صادقين ستكون مليئة بالمحتالين الذي يجب الحدر منهم.