I am quoting this post based on the request of one of the members.

نعم تقريبا, ولكن هدا في حال كانت الشركة فعلا صادقة ولا تبيع مالا تملك, المشكلة هنا ان الشركة لا تمتلك الهاش ريت ولا يمكن ان تضمنه لك, ماقصده بوجود طرف ثالث هوا ان يمتلك ذلك الطرف الوسيط الاجهزة تحت تصرفه وحيازته, وهدا غير متاح.


هم فكرو مليا في هدا الموضوع ولذلك في شروط العقد انت مجبر على تلقي الدفعات بنظام PPS يعني لايهم عدد البلوكات ولكن الدفع تقريبي بناء على الصعوبة الحالية, وهدا النوع من الدفع يترتب عليه 4% عمولة للحوض.

على العموم في نقاشي حول هدا الموضوع في القسم الانجليزي تم اخباري بأن الشركة اوقفت هده الخدمة, طبعا لو كانت لم توقفها فأن اصحاب العقود القديمة كانو سيجنون ارباح طائلة نظرا لانخفاض الصعوبة بعد حظر الصين, وهدا يعيدنا الى المربع الاول

You have not posted the other logs so I can't tell, however, very rarely the temp sensor error is actually a temp sensor error, in that case, some custom firmware will work as long as 2 out of 4 sensors are working unlike the stock firmware which requires 4 out of 4, but this isn't usual, however, you lose nothing if you try another firmware like Vnish or BO.



Follow the ribbon cable end at the control board, there are some tiny but readable labels of Chain numbers.

What you talking about is an error that says "read temp sensor failed", in that case it's almost always a bad chip unless the error appears on all 3 hash boards then that means a PSU issue, however, your problem is less serious than that.


sensor "TYPE" issues are usually related to the control board, flashing the miner using SDcard will often fix it, you could try custom firmware as well if you like, although that might not be needed if the stock firmware fixes it.

This is caused by physical damage, there isn't much you can do to fix it if you don't have the tools and the skills needed.

Notice while the kernel log reports an issue with the temp sensor, this problem is rarely caused by an actual faulty temp sensor, it's usually caused by a bad chip on the hash board the reports the error, in your case chain 2.

Sometimes, the PSU can be the cause, to test this, unplug the other two hash boards and see if this one works, if it does not, then it's not a PSU-related issue and you will have to unplug that hash board and mine with 2 of them.

By the way, this is a very common issue with all the 17 series, at this point probably the vast majority of these miners have lost at least one hash board.

"Absence of evidence is not evidence of absence", one could argue that IF price was indeed not a factor, we would be at +4% or so instead of just +2%, of course, there is no way to prove the second theory is correct either, but as it stands, I believe price plays a major rule in suppressing the difficulty rise.


That's a good point, when those folks start mining in the winter, power factor and BTC price will make less sense to them, so they will likely just mine regardless of everything as long as it's cold outside just to heart their houses, however, thankfully, I highly doubt any major farm is waiting for the winter, it's just a few guys with probably 1-2 gear each, so they won't have a huge impact on difficulty IMO.

With that said, winter will surely help difficulty rise, in many warm/hot areas mining gears have been downclocked to pass the wave heats of the summer, I have some good hashrate on standby waiting for the cold weather, and then you have the overclockers who push their gears to the limit when it gets cold, so in general, winter will help increase difficulty on most levels.

I wasn't aware of that until stompix mentioned it here

Is it irrelevant right now? well, not if you consider it as a general discussion which applies to all other cloud mining services, really the question is (did they stop because their gears were shut down?) or ( because they knew a huge difficulty drop was coming and they would be in deep shit), based on all the facts mentioned above, I can't help but think it's the latter.

Seriously this is such an easy and very profitable business, if you own a mining pool, sell imaginary contracts, once the promised hashrate starts to produce more BTC than you thought possible, terminate the contracts, if the difficulty keeps going up, you are GUARANTEED to make a profit, as easy as it gets.

Once you terminate the contract, if BTC price has gone up since then, compensate the buyers with the same USD value they paid, if BTC price drops, just send them back the equivalent amount of BTC they paid, I am not aware of any other way to make money easier than this risk-free so-called cloud mining.


Even if they don't really own any of those cloud mining companies, I am pretty sure once the difficulty issues settle down, they will come back with the same contracts again, given how easy it is to profit from this kind of scheme, which is shady at it's best.

This isn't something against Viabtc in particular, this whole thing is just to show you guys that buying a mining contract is almost a guarantee to lose money, I see many people waste thousands of dollars on these contracts only to end up losing money without having a single chance of making money.

نعم اخي وهدا الامر طبيعي جدا ويتم ممارستها في جل القطاعات, فمثلا الكثير من الناس يتملكون الاث ثقيلة يعرفون انها قد تدخل عليهم 1000$ ولكن يقومو بتأجيرها لشخص اخر مقابل 500$, نظريا وعلى الورق التعدين السحابي يمكن ان يكون ناجح, واعتقد من وجهة نظري ان الحل الوحيد للتغلب على المشكلة التي تم سردها في تعليقي الاول هي بوجود طرف اخر محايد.

في المثال السابق, انا امتلك الاجهزة, الاخ Kavelj22 يريد استأجارها مني, تدخل انت كطرف ثالث وتقوم بوضع اجهزة التعدين في مكان تملكه انت وتشرف على توجيه عائداتها مقابل مبلغ معين, يقوم Kavelj22 بدفع كامل المبلغ لي عند استلامك لاجهزة التعدين مني, تقوم انت بتشغيلها لحسابه, وهنا الكل سوف يستحصل على نصيبه المتفق عليه سواء كان بالخسارة او الربح.

ولكن المشكلة هنا ان بعض الشركات الموثوقة لا تمتلك اجهزة التعدين اصلا, وهدا بناء على تحليل شخصي من لايوجد اي دليل عملي يدعمه, ولكن على سبيل المثال, شركة Viabtc تضع في اول شرط من شروطها انه لايمكن استخدام الهاش ريت المباع لك الا على حوضهم الخاص !! هنى يمكن رسم علامة استفهام كبيرة جدا ؟

انت كنت تمتلك اجهزة التعدين, لماذا تجبرني على استعمال حوض تعدين معين تملكه انت؟؟ السبب من وجهة نظري هوا ان الشركة لا تمتلك اي هاش ريت اصلا, بل انها ستقوم بأعطائك قوة تعدين وهمية داخل موقعها وتدفع لك العائد بالبتكوين في نهاية كل يوم كما ولو كنت تستخدم قوة تعدين حقيقية!

في المقابل الشركة لديها خدمة hedging تقدمها للاشخاص الذين يمتلكون فعليا اجهزة تعدين ويريدون ضمان عائد ربحي تابت بالدولار فيكون الاجراء كالاتي:

اقوم انا بطلب هده الخدمة مقابل قوة تعدين تعادل مثلا 100 تيرا هاش, يدفع لي الموقع مثلا 100$ شهريا لايمكن سحبها قبل نهاية الشهر, في نهاية الشهر يتم التأكد من متوسط الهاش ريت ويتم الدفع لي, لو كان المتوسط فعلا 100 تيرا يقومو بدفع 100 دولار لي بغض النظر عن ارتفاع او انخفاض سعر البتكوين.

تقوم الشركة نفسها بعرض ال 100 تيرا هاش الخاصة بي التي اشترتها مني ب 100$ للبيع بقيمة 150$,  تكسب الشركة 50$ بدون ان تمتلك اي جهاز تعدين ولا اي صداع, في حال اني تخلفت على توجيه اجهزتي لحوضهم بعد مرور 10 ايام مثلا, اخسر ربح ال 10 ايام ويمكنهم اعطائك بدله هاش وهمي ودخل ايضا وهمي ونظرا لانهم اخدو مني 10 ايام مجانية واخدو منك 150$ فهم مزالو يكسبون حتى في حال تخلفي عن توجيه اجهزة التعدين.

طبعا السينارو هدا من مزج خيالي, بناء على المعطيات التي امامي ولفهم الموضوع الاكثر يمكن الدخول لموقعهم وفهم طبيعية عقود التعدين التي يبيعونها وفي المقابل فهم خدمة ال hedge المقدمة للمعدنين واعتقد ان شخص طبيعي ( او غير طبيعي ) سيصل الى نفس الخلاصة التي وصلت لها.

I have always thought some cloud mining companies don't really own any mining gears, Viabtc being one of them since they FORCE you to point the contract hashrate to their OWN pool only, which likely suggests that they do NOT own any mining gear.

My first impression was that they would collect x amount in USD from you, pay it back in pieces every day after artificially displaying a certain hashrate on your account which comes from nowhere and does not exist in the first place, and since they will pay you in PPS, they can somehow know in advance the amount of BTC they will have you pay you, and since difficulty only goes up, they can somehow easily estimate the total earnings for x hashrate for a whole year, charge you 20-30% on top of that for-profit and some margin, buy BTC in advance, and slowly send you payouts.

Example:

100th mines 0.1 BTC in 1 month, they can assume that difficulty will cause that to drop 5% every month, so the total they will ever have to pay you for that imaginary 100th would be 0.92BTC, say the that current bitcoin price is $10,000, they will charge you $12,000, they take those 12k and buy 1.2 BTC

If difficulty does increase 5% every month, they will pay you .92BTC and keep 0.28BTC,  the worst-case scenario they will have to face is probably an average difficulty increase of 0% throughout the contract period which means, they earn nothing and lose nothing.

While that seems like a great plan, they will still face some risks if the difficulty drops, probably that's why they force you to get a 3-year contract since its extremely unlikely for the average difficulty in the 3 years period to be lower than the first month, and since most folks don't know how to run the numbers, they will assume that price will go up every day and that the 12k they paid will net them 20k or something, at least this is what the online calculators will tell them.

I gave it a second thought, maybe I am not being fair to them, maybe they do have the mining gears, but then I saw this on their website.



Ignoring the fact that these two claims contradict one another (if doesn't count on the facilities, there is no malfunction risks of any kind), but it does say out loud that

Which if you add it to the point above which clearly states


Strongly suggests that there is no real hashrate involved here, it's just some imaginary figures that appear on the buyer's dashboard showing they have x amount of hashrate.

Also the fact that there is no single report from those contract owners about any hashrate drop despite the fact that 50% of the world's hashrate was wiped out, Viabtc "alleged" mining gears can't be mining in a vacuum, if they did have real gears, these contracts would have been affected, honestly, at this point, I don't have the slightest doubt about my theory.

I also believe that Viabtc could be in deep shit.

Let's evaluate one of their mining contracts just for fun:


100th will cost $4,600*6% =4,876 + $5,831 ( for Electricity) = 9.51 $ per day in total

When this contract first started Bitcoin was trading at 19.2k and the difficulty was at 19.1T, those 100th earned 12.2$ a day back then, the problem here is that Viabtc didn't forsee the China ban, and difficulty has not been doing them a favour, below the summary of difficulty throught the period of the contract.




The average difficulty is 19.5T, which means they pay on average 0.0006267BTC per day for that 100th contract, if they did buy bitcoin with the money they got in advance it means they bought at 19.2k, which is 0.55 BTC, if we divide that by the number of days passed since then (301), they have already paid (0.189BTC) and have a balance remaining of 0.361BTC, which at the average difficulty of 19.5 can suffice 576 more days, while the contract ends in 824 days.

For Viabtc to breakeven, they will need an average difficulty of 27.9T for the remaining 824 days, anything above that is profit.

At first glance, this seems like a great business model, since difficulty can only go up, but with the China ban, I think Viabtc could be in some deep shit, they will need AT least an average of 2.9% increase in difficulty every month for the remaining 27 months just to breakeven.

With the halving being a few months away from the end date of these contracts, the Chinese are not relocating fast enough, chips shortage isn't over, BTC price isn't mooning, it's no more an easy win-win for Viabtc, while I do believe difficulty will only go up from here, I am not sure it will keep hitting a 2.9% every month, especially not if the bear market bring us crashing in 2022 or 2023.

Wattage does not matter as long as it's equal or bigger than what your miner needs, so 3600w is good, however, you need to make sure the voltage and the physical set up is the same, I don't know about Avalons but with most of Bitmain gears, you can't mix and match PSUs as they differ not only in size but in the physical design as well, so make sure you ask the seller if the PSU would fit on your miner or not.


Check with grace on telegram (@gracezhou1993), you can tell her I referred you (I get nothing in return) but she will likely help you with the price if you mention my name.

No, that does not matter.


That also is unlikely, what is the dimension of the power cord? you should do just fine with anything => 1.5mm2, but even with less, the cord will become warm to touch, maybe gets too hot, but I don't think it will cause this error in your miner, what could be the problem, however, is the voltage, are you sure yours is between 220v and 240v?

خياراتك محدودة اخي الكريم, لايمكنك الحصول على الامان ورخص السعر والسيولة العالية و كل هده الميزات في عملة واحدة.

USDT

الميزات:  موجودة على عدة شبكات وتحويلها شبه مجاني , فوليوم عالي جدا في كل المنصات تقريبا!
العيوب:  خطورة عالية ومركزية!


USDC

الميزات= موثوقة ومؤمنة اكتر من USDT بمراحل, موجودة في 90% من المنصات
العيوب = ليست موجودة على باينانس او ترون تشين, ومعظم المنصات لايوجد بها الا خيار ERC يعني قيمة الايداع والسحب مرتفعة جدا, الفوليوم متوسط


DAI

الميزات  = نسبة امان اعلى من غيرها نظرا لطريقة حفاظها على قيمتها,  ليست مركزية, موجودة على 90% من المنصات
العيوب   = سيولة منخفضة في معظم المنصات, تحويلها على ERC فقط وتكاليف التحويل باهضة.


شخصيا افضل التنويع بين هده العملات لتقليل المخاطرة, في العادة افضل USDC على غيرها فرسوم التحويل لا تعني لي الكثير لاني لا اقوم  بايداع وسحب بشكل مستمر, وعندما احول من منصة لاخرى اقوم بتحويل عملة رخيصة ومن ثم العودة الى USDC.

انا لا اختلف معك من حيث المبداء ولكن اختلف مع هده النقطة جدا, بنفس صفغة سؤالك يمكن ان نقول "ان كان التعدين مربح, لماذا تقوم شركات توليد الطاقة بببيع الطاقة للمعدنين " ؟ يمكن ايضا المبالغة في السؤال والقول " ان كان ايراد المحل مربح, لماذا يقوم صاحبه بأجاراه لشخص اخر بدل ان يشتغله بنفسه" ؟؟في الواقع, لماذا تقوم مصانع اجهزة التعدين ببيعها بدلا من الاحتفاظ بالارباح لنفسها؟ والقائمة تطول

في الواقع يوجد شركات تعدين سحابي معروفة وموثوقة مثل  Bitdeer شريكة اكبر مصنع لاجهزة الاسك Bitmain وايضا Viabtc لديهم عقود تعدين سحابي وهم من اكبر احواض التعدين في العالم.

الان ولأجيب عن سؤالك لماذا تقوم هده الشركات ببيع قوة التعدين, الجواب بكل بساطة هوا عمل مايعرف ب hedge او تأمين رأس المال ضد هبوط سعر البتكوين, دعني اعطيك مثال علمي.

لنقل ان لدي 10 اجهزة تعدين, بالمعطيات الحالية دخل كل منها 10$ شهريا, بتجاهل عامل الصعوبة, لو ارتفع السعر دخلهم يزيد ولو انفخض دخلهم سينقص, تمام؟

انا متخوف من هبوط السعر وانت متفائل بالصعود, نقوم بأبرام عقد بيني وبينك, وتستأجر مني عدد 5 اجهزة لمدة سنة, ولاننا نعرف ان الدخل الحالي 120$ في السنة للجهاز الواحد يعين الاجمالي سكيون 600$, ولنفرض ان فاتورة الكهرباء الاجمالية هي 100$, فتقوم بدفع 700$ لي وانا اعطيك حق التصرف في تلك الاجهزة لمدة سنة كاملة ان كسبت مليون حلال عليك وان خسرت 500 الله يعوض عليك. هل يوجد اي شي غلط في الصفقة حتى الان؟ ابدا, الكل مبسوط, انت تراهن على صعود السعر, وانا احمي نفسي من هبوط السعر وتقليل خسائري في حال هبوط السعر ونقص الدخل.

لاحظ معي هنا ان من يملك الاجهزة لديه عامل قوة يفتقر له الشخص الاخر, انا ضمنت منك ال 700$ واصبحت في جيبي, انت لاتمتلك مني سواء عقد مليء بالشروط وقابلية الالغاء من طرفي, فمتى يمكن ان تحدث المشاكل؟

لنقل ان سعر البتكوين بعد 4 اشهر وصل الى 10 اضعاف السعر التي تم عنده ابرام العقد, ودخل الجهاز الواحد اصبح 100$ بدل من 10$, اي عدد ال 5 اجهزة اصبح دخلها الشهري 500$ بدلا من 50$,  انت دفعت لي 700$ لفترة سنة اي انك دفعت 58$ دولار للشهر والان وباستخدام اجهزتي التي هي تحت تصرفي انت تجني 500$, يعني انك كل شهر تسترجع المبلغ الذي دفعته لي, وان تكرتك تتصرف في اجهزتي حتى نهاية العام يعني انك ستكسب 4000$ اضافة لدخل ال 4 اشهر الاولى !!!


هنا يكون الاختبار الحقيقي لمالك الاجهزة, الخيار الاولى (  لقد اخطأت في تقديري لسعر البتكوين, اصبح الدخل اضعاف مضاعفة, كان يجب ان لا ابرم هدا العقد, ولكن ! هدا نصيبه ونحن اتفقنا ولن اغير كلامي), طبعا كلنا نعرف ان القلة من البشر سوف يختار هدا الخيار للأسف.

الخيار التاني ( الاجهزة تحت تصرفي, هدا الشخص كسب 200$ في 4 اشهر, وكسب في الشهر الخامس 500$ اي انه استعاد المبلغ المدفوع والان يريد استخدام اجهزتي لمدة 7 اشهر اخرى, مستحيل لن ادعه يستغلني) سوف اقوم بالغاء العقد معه واخبره انه استرجع رأس ماله المدفوع, وان لم يكن راض سوف اعطيه 200$ مكسب فهوا لم يخسر شي وكسب 200$ بدون اي تعب فأنا لم اسرقه وهوا لم يخسر.

اتمنى ان اكون وصلت الفكرة, الامر ليس بالسهل, عندما يكون الطرف التاني يكسب اكثر من ما دفع هنا سوف تحدت مشاكل, بعض الشركات ستقول لك انه حدث كوارث طبيعية لهم واقفلو مزرعة التعدين, البعض سيقول ان الحكومة استولت على الاجهزة, البعض سيقول انه تمت سرقة الاجهزة, هناك الاف الحجج التي يمكن ان يأتوك بها عندما يصبح دخلك اكبر بكثير من دخلهم, يمكن لبضعهم ان يدفع لك ضعف ماقمت بأستتماره لاسكاتك ان كانو يهتمون بسمعتهم, ولكن في النهاية من الصعب الاستمرار في العقد الا في حال كنت انت الطرف الخاسر.

طبعا لتجنب هده المرحلة تقوم الشركات الكبيرة مثل Bitdeer و Viabtc ببيع العقود باسعار غالية جدا, فهي تضمن انها ستكون الرابحة في معظم الاحوال الا اذا حدث شي جنوني في دخل تلك الاجهزة, وحتى الان هدا لم يحدث فالخسارة دائما في طرف المشتري, ولكن ان حدث العكس انا اراهن ان "الحكومة ستغلق مزارع التعدين الخاصة بتلك الشركات" او " فيضنات قوية " او اي عذر احمق سوف يكون جاهز للعيان.

لذلك 90% من هده الشركات هي شركات النصب, ال 10% الاخرى تبيعك عقود بأسعار مبالغة, ولم يمر على اي منها اختبار حقيقي صعب مثل الذي تم شرحه بالاعلى. فالافضل ان تتجنبهم من الاساس.

We dropped


It does seem like some miners can't do with current prices which is great news, I am not expecting a drop by any means, but not going up much is probably all that I could hope for from now on.


I am afraid the cost of the mining gear will be higher than or equal to the tax reduction you get, I highly doubt Bitmain can afford to sell you the same gear for the same price outside of China, the 10k gear in China will most likely cost them more to make which will be enough to offset the tax thing, moving outside of China won't make mining gears Cheaper in the U.S, it will just make them more expensive for the rest of the world.

I'd say 99.99% NO.

This chain does not detect complete asic count at the first test, which likely means there is an issue with Chain 0, it drops a while after the miner starts hashing, this, however, could be a PSU issue, can you post screenshots of the miner status page?

That is not always the case, the voltage stored in the EPROM could be the same and it will work just fine, some miners like the S9k had the type ID printed on the hash board itself, some of the S17 series have the type id in the kernel log, so the seller can pre-program the dashboard before shipping it.

---

OP, the most component of the miner that fails is the hash board, it's very hard to find hash boards of very old miners like the S9s, it will be extremely difficult to find any for S19 pros, even if you do, the price will likely be way too high, not telling you to dismiss the idea, but keep your expectations as low as you can afford.

Keep in mind that these hash boards are sensitive, it will be very hard to ship them securely, it's always best to buy a hole miner and use its component as spare parts, but this of course only makes sense if you have a few miners and not just one.

Plan B would be to send them for repair, which will most certainly be a lot cheaper than obtaining a replacement hashboard.

Who is he going to sue exactly? there are a dozen of folks who do that, most with no known real identity, the resources needed to secure such an open-source code are far more than what Kano or anyone else can afford.

In fact, even the devs who have more skin in the game like Jeff Garzik who wrote the cpuminer code or CK who then forked cpuminer to Cgminer, and despite that fact that he is the major dev in this and if I am not mistaken Cgminer functioned for a while before Kano touched the project, the latter seems to be the ONLY person who cares about this.

Even the other devs likes luke-jr don't seem to care, almost all of the major devs who contributed to the project one way or the other are now successful millionaires who probably don't even know about the existence of these custom firmware in the first place.

While Kano isn't doing anything wrong by "chasing" those who violate the license of the a code he heavily participated in, it's just sad that he does not have anything better to offer for the community other than nagging about people breaking the license which is no matter how you look it at is just a waste of time judging by the fact that the custom firmware market is only growing, but well, it is what it is.



Because the forum is not a court of law, it does not even moderate scam, you can literally create a topic saying you are a scammer and you are planning to scam someone and the mods will most likely not delete it (unless it breaks one of the rules which scam isn't one of them) let alone topics that violate a certain license, the forum will not project the license on your behalf, also,  nagging about it here will change NOTHING, if you want to stop all these folks from making money off your code, stop nagging and start coding, add the auto-tune part and let the users use your free version, at that point, nobody will be using those custom firmware that take 2-4% fees.

If you take the above seriously and do decide to start coding the cgminer again, I am sure the miners' community will fund the development, I will be the first person to donate and will help you spread the word to get enough donations to keep you going.




 

The level of fluctuation you talked about is not usual but it really does not matter at all, your average accepted hashrate is all that matters as far as your payout is concerned, so if your daily or 12 hours hashrate is within -+1 to -+2% of the hashrate you see on the miner status page - everything is just fine and the fluctuation should be ignored, if your average hashrate on the long run also fluctuates as much then you that means something is wrong somewhere.

I don't have anything against this "theory", in fact, I do tend to believe that it makes a lot of sense, however, I have a few S9s that have been mining like a beast for about 4 years, those gears are turned off and on at least once a day, sometimes 3-4 times a day, and they are treated like shit, up to this point, zero issues. On the other hand, I had some S17 series gears treated very well, not much off/on, very good cooling setups, and they died in no time.

So really it all boils down to the quality of the miner, if the gear is already bad as is, I'd imagine that turning it off and on more often could speed up the failure process, but if the gear is rock solid, I highly doubt it will kill it before it becomes unprofitable to mine anyway.