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1  Economy / Computer hardware / [WTS] Innosilicon A9 ZMaster (link to reddit post) on: June 03, 2019, 04:45:03 AM
Please see information here: https://www.reddit.com/r/zec/comments/bw5uoz/innosilicon_a9_zmaster_aud1500usd1040_or_best/

Escrow offered with trusted bitcointalk members.
2  Economy / Computer hardware / WTB: EBang EBit E9.3, EBit E10, S9, Avalons, Bitfly, Dragonmint (maybe others) on: June 02, 2019, 01:53:04 AM
Hi, I'm looking to acquire some miners to send to a co-lo mining facility in the USA, so ideally I want to buy from US sellers.

I'm interested in anything that's reasonably profitable with very low electricity prices, so the EBang Ebit E9-10 machines are good, the Antminer S9s, Halong DragonMint T1, Bitfly Snowpanther A1, Bitfury B8, Innosilicon T2 Turbo, Antminer S11, Canaan Avalon 8 and 9xx series, although I would prefer to buy several cheaper machines than buy only 1 of the more expensive ones.  I'm looking to buy each month, so I'm making a start here.

If you have any of these and are in the USA and want to sell, please post your offers inc. shipping.  I can also trade an Innosilicon A9 ZMaster if there's any interest in that to top up a BTC or cash price.  Escrow preferred unless you have a way high trust rating.

Thanks,
James
3  Economy / Computer hardware / Innosilicon A9 ZMaster 50 ksol, sell or trade for Bitmain machine -Australia on: May 28, 2019, 11:22:09 AM
Hello,

I'm in Australia and have an Innosilicon A9 ZMaster 50ksol machine I bought in late February this year.  It's in top working condition and does well at the moment even with the release of the faster ksol-sec machines.  Slushpool is good, I prefer Nicehash and payments in BTC.

I'm looking to move to different equipment and would like to sell, COD to Australia or BTC/ETH/BCH/ZEC/maybe others (Escrow) asking AU$1500 or best offer.  I'm open to a straight swap or some kind of trade for a Bitmain Antminer S15 or similar, maybe an Innosilicon T3, MicroBT Whatsminer M10S, Bitmain T17, EBang EBit E11+/++, will consider others (I can add cash or crypto on top with the Innosilicon A9 ZMaster if you're interested).  

It's a 620W machine which makes it viable even with crazy electricity prices.  My elec price is 25c kWh after discounts for pay on time etc, and after other variables (hash rate goes up and down although averages out nicely) it makes ~ $50/week on Nicehash.  You can use factory default mode, this is what I choose, or higher performance modes or economy modes (less power, less hashrate).  Adding new pools is easy and simple.  The Web interface is straight forward.

Thanks,
James.

PM for pics or to discuss.
4  Alternate cryptocurrencies / Mining (Altcoins) / Good coins to mine with big CPU rig? on: February 26, 2019, 01:42:06 PM
Aside from Pascal Coin which can only be mined efficiently with CPU power, are there any good ones that CPU miners can mine?

Say, a machine with 72 to 128 CPUs.

Would like to try something interesting and actually get some shares and maybe a couple of coins.

Thanks,
5  Alternate cryptocurrencies / Mining (Altcoins) / Forked Bitcoin, how to solo mine with RPC to daemon on: February 22, 2019, 10:26:22 PM
Hi there,

I forked Bitcoin for a bit of fun, and the mining is working on my laptop (very low difficulty), but I'd like to go a little faster by setting up the daemon on a VPS, and pointing some mining software to it from another VPS with a few CPUs or a GPU, if GPU mining software is still available for Bitcoin but can do alt-coins with same PoW.

I would buy a USB miner or a small ASIC, but I don't know if they can use RPC creds.  They normally mine to a pool as I understand it, and understand stratum.

Problem is I'm having difficulty finding mining software that will mine a sha256d alt-coin and can use RPC credentials, since I don't have a pool set up just yet.  And won't complain about an invalid coinbase address.  I suppose that might be an issue.

Any tips?  Thank you.
6  Economy / Lending / Seeking a loan of BTC, offering collateral on: February 17, 2019, 02:35:49 PM
Hello,

I am looking for a small BTC loan.  I offer the following as collateral:

1 x New Samsung Galaxy S9+ phone (probably worth about $500 second hand, but it's in brand new spotless condition)

1 x Second hand recent HP Envy x360 laptop (retails for about $1700, probably worth $900 second hand, but it will likely sell for $700 quickly) - 4 months old, top condition and well looked after by a professional programmer and Web developer

1 x Mercedes Benz 2000 model C200 Elegance motor car, registered and in beautiful condition.  British racing green.  Original condition, no modifications, spent $2000 recently on servicing, has spotless leather interior, sunroof, electric windows and mirrors, drives beautifully, 4 cylinder 2.5, packs a punch for a little medium sized sedan, a pleasure to drive.  Worth about $1500 because it's getting old and has 250,000 on the clock.

All collateral is in my name and under my control.  I offer these items or any of them for a loan of BTC that you believe is reasonable for the collateral offered.

Please PM if interested.  I am willing to post more collateral upfront such as the laptop or phone if you require a bit more of a safety net, so long as it can be returned to me upon repayment of the loan.

I am looking for a loan term of three months before full repayment (partial repayments before the end of the three months).
7  Economy / Computer hardware / [WTB] Any BTC miner on: February 17, 2019, 01:13:50 PM
I know they are not profitable but I would like to play with one.

Preferably a used AntMiner S9 or Avalon machine.
8  Alternate cryptocurrencies / Mining (Altcoins) / Zcash ksol to sol, is 50k/sol 50,000 sols? Is zcash equihash? on: February 15, 2019, 01:03:42 PM
Hi, I think I am making a mistake.

I am not sure how to convert sol to k/sol and back again, but I gather 10 k/sol is 10,000 sol and 50k/sol is 50,000 sol.

Looking at the Nicehash profitability calculator, I can't believe what I am seeing.  I must be making a mistake.  For the Innosilicon A9 ZMaster, at 50k/sol, this is equivalent to 50,000 sol.  Is that right?  Can someone clarify so that I understand how to use the calculator correctly?

And it takes 620 W of power.  Apparently.  So it might be profitable even with insane electricity costs, if only for a while until the A9+ models take over and push up the difficulty I suppose.  These are equihash sols as I understand it.

Thank you...

Just trying to get my head around this if I want to get into mining even in a modest way and I do... even if I am mistaken, making beer money each week would be pretty cool.
9  Alternate cryptocurrencies / Mining (Altcoins) / Is Decred or any Blake256R14 mining profitable? on: February 14, 2019, 05:19:12 PM
Is mining for Decred still profitable?

Especially at very high hashrates, like terahashes?

I'm not aware of any other Blake256R14 coins, but I suppose they exist...

Thanks
10  Economy / Computer hardware / [WTB] Innosilicon A9 ZMaster, Innosilicon A10 ETHMaster, Bitmain DR5 on: February 14, 2019, 04:52:19 PM
Prefer Innosilicon A9 ZMaster but will certainly consider Innosilicon A10 ETHMaster for a decent price, shipped from Australia (I'm in Australia).  Also need the PSU and anything else to get the machine running.

Also Bitmain DR5 machines (x2), for 35 TH/s each.  These seem quite reasonable, small profits with electricity but not bad.

If you are overseas I am still interested so long as the shipping costs are not much more than about $100 to $150, with insurance for damage in transit that I could claim on if necessary.

Offering cash in bank, VISA card payment, cash on delivery or BTC, whichever works for you.

Thanks,
11  Bitcoin / Mining support / Any experts with Canaan Avalon miners? Need help please on: February 14, 2019, 01:45:57 PM
Hello,

I'm trying to get in contact with Blokforge since they seem to have a few Canaan Avalon 921 miners (20TH/s models) in stock, but I guess they're busy or won't respond unless I make an order.

Problem is I am not entirely sure what I need to get up and running with.  Do I need a power supply unit for every miner for example, or will one PSU supply several miners?

I'd like to order 7x Avalon 921 miners, the controller unit(s), and PSU and any cables, but not sure exactly what I need.

And whether I need a new router with X ports to plug them in with ethernet cables,

Thank you for any help.

PS.  I'm open to the idea of Bitmain miners if I can get about 100 TH/s out of a few of them, but I don't know where I can buy them in Australia.  Preferrably S9i models or similar.  So I would need 7 or 8 miners I suppose, if they are 14TH/s models.  I do prefer the Avalon discount on the 921s though!

Cheers.
12  Bitcoin / Mining speculation / Difficulty for newbies on: February 10, 2019, 04:54:12 PM
Hello,

Is anyone able to explain in clear terms, maybe with a simple high school level formula, what difficulty is and what it means exactly for mining?

Apparently it's a measure of how "difficult" it is to find a block below a certain target, which adjusts every 2016 blocks.  But still, with the current difficulty of 5814661935891.805 as I write this, I don't know how to interpret this number.

What does it mean for example, if I hash at X TH/s?  Does it express a time length to probably find a block if solo mining at a given hash rate, or something else entirely?  What I would like to do is punch in a difficulty and get something out of it that I can understand, like a prediction of how many satoshis I might be able to mine in a given 24 hours with some hash rate.

Thank you!
13  Alternate cryptocurrencies / Mining (Altcoins) / No Peercoin blocks found by pools for a while on: January 05, 2019, 08:38:30 PM
I wonder what's going on with Peercoin?

The popular pools are not finding blocks for days, the network hashrate has gone right up, maybe it's a solo miner who is taking all the rewards for the past few days.

Cointron used to have a PPC pool I think, but no more.  Maybe it just didn't work out.

Does anyone know of a good Peercoin pool that might find a block once a day or something?  Or is it just a bad idea to mine now, or is it best to try some luck with half the network hash rate or more and solo mine?

Thanks,
 Smiley
14  Alternate cryptocurrencies / Mining (Altcoins) / Blue screen crash (Win 10) when trying AMD GPU mining software (VIDEO_TDR_*) on: January 05, 2019, 01:13:53 PM
Has anyone managed to avoid the blue screen of death issue with Windows 10, when trying to mine with AMD GPU mining software?

It's a VIDEO_TDR_* something problem.  Suggested solutions include keeping software up to date and using the latest drivers, which I have done, but I keep crashing (Phoenix Miner, Claymore, others).  I tried ETC mining, but I think what I need to download for my modest AMD mobile GPU is too large and I am unable to mine.  I have a mobile AMD Radeon Vega card (gfx902).

I would like to mine a small amount of something, anything really, where a good AMD GPU miner is available.  Currently only a version of sgminer 5.3.8 seems to work without crashing my system.

And of course, a little at a time, so I don't overheat or destroy the longevity of my laptop.  If it lasts for 6 months or longer mining an hour or two a day, I consider this acceptable; by then I will have just bought a desktop with bigger cards to mine with, and some small ASICs on power boards, and a new laptop that I won't mine with just to get other stuff done.  Smiley

If anyone knows how to avoid this VIDEO_TDR_* error with Win10 when trying to use an AMD GPU to mine, I would love to hear your experiences and how to work around this problem, if it's possible at all.  Otherwise I think I will just CPU mine for a little each day for PASC (Pascal Coin).  Thank you!
15  Alternate cryptocurrencies / Mining (Altcoins) / AMD GPU mining software for Win10 or Linux, supporting scrypt on: December 19, 2018, 12:57:15 PM
Hi,

I can solo mine with a cpuminer, but that's no good.  I'm looking to further test my server with a higher hashrate and dump the protocol output if I can to see what's going on.

I can't get any variant of sgminer or ccminer with AMD support to work at the moment.  They all either only support stratum, or the old getwork method, or support getblocktemplate but fails for some reason and falls back to getwork, which is not supported by the defcoin daemon.

Any ideas or pointers?

I have Mingw64 and Cygwin to compile with, as well as Visual Studio 2017 if I need to compile from source.  I have the latest AMD APP SDK.

Thank you,
James


16  Other / Beginners & Help / Can someone help please debug solo mining? on: December 19, 2018, 10:57:00 AM
I have tried solo mining with the defcoind software, but I'm not getting anywhere.  Miners seem to want getwork(), but defcoin doesn't support getwork.  I've also had errors about getblocktemplate and/or coinbase not available/invalid.

Here is the latest I get with my cgminer output to try and test with (not solo mining yet, just trying to get it to work)

 [2018-12-19 21:54:28] Started cgminer 3.7.2
 [2018-12-19 21:54:28] Started cgminer 3.7.2
 [2018-12-19 21:54:28] CL Platform 0 vendor: Advanced Micro Devices, Inc.
 [2018-12-19 21:54:28] CL Platform 0 name: AMD Accelerated Parallel Processing
 [2018-12-19 21:54:28] CL Platform 0 version: OpenCL 2.0 AMD-APP (2482.6)
 [2018-12-19 21:54:28] Platform 0 devices: 1
 [2018-12-19 21:54:28]  0       gfx902
 [2018-12-19 21:54:28] GPU 0 iAdapterIndex 0 strUDID PCI_VEN_1002&DEV_15DD&SUBSYS_8497103C&REV_C4_4&98C7E10&0&0041A iBusNumber 4 iDeviceNumber 0 iFunctionNumber
 0 iVendorID 1002 strAdapterName  AMD Radeon(TM) Vega 8 Graphics
 [2018-12-19 21:54:28] GPU 0 AMD Radeon(TM) Vega 8 Graphics hardware monitoring enabled
 [2018-12-19 21:54:28] Failed to ADL_Overdrive5_ODPerformanceLevels_Get
 [2018-12-19 21:54:28] Failed to ADL_Overdrive5_FanSpeedInfo_Get
 [2018-12-19 21:54:28] Probing for an alive pool
 [2018-12-19 21:54:28] Popping work to stage thread
 [2018-12-19 21:54:28] Testing pool http://1.2.3.4:1335
 [2018-12-19 21:54:28] JSON protocol request:
{"method": "getwork", "params": [], "id":0}

 [2018-12-19 21:54:28] HTTP request failed: The requested URL returned error: 404 Not Found
 [2018-12-19 21:54:28] Failed to connect in json_rpc_call
 [2018-12-19 21:54:28] Succeeded delayed connect

 [2018-12-19 21:54:28] JSON decode failed(1): '[' or '{' expected near 'HTTP'
 [2018-12-19 21:54:28] Failed to resume stratum, trying afresh
 [2018-12-19 21:54:28] Succeeded delayed connect

 [2018-12-19 21:54:28] JSON decode failed(1): '[' or '{' expected near 'HTTP'
 [2018-12-19 21:54:28] Initiate stratum failed
 [2018-12-19 21:54:28] Closing socket for stratum pool 0
 [2018-12-19 21:54:28] FAILED to retrieve work from pool 0 http://1.2.3.4:1335
 [2018-12-19 21:54:28] Pool 0 slow/down or URL or credentials invalid


I can't get bfgminer to work at all either.  I have no stratum support, but I don't know how to set that up just yet, or whether that will make any difference at all.

Thank you if you can point me in the right direction...
17  Alternate cryptocurrencies / Mining (Altcoins) / How to solo mine if server does not support getwork on: December 19, 2018, 03:39:23 AM
Hi,

I've tried a search on solo mining if mining software reports a problem, and the logs show "getwork" is not supported.

Apparently I can use --no-longpoll and --no-getwork with eg. ccminer, would that make it use getblocktemplate instead?

Specifically I want to solo mine defcoin, and I'm looking at the RPC interface and probably setting up stratum to point my miner to it.  Does anyone set up their own stratum, and if you do, does anyone use https://github.com/zone117x/node-stratum-pool?

It's hard to figure out what I should do if miners like to use getwork, but it's not implemented in the server software.  Any help please?
18  Alternate cryptocurrencies / Mining (Altcoins) / Request for info: ETH/other miners on: December 18, 2018, 02:23:42 PM
Hello,

I'm buying some Avalon BTC miners, and I'm interested in buying other miners for ETH, other coins.  I'm interested in any that may be out there.

What are your experiences with them?  I found an ETH miner on eBay that does 190MH/s but power consumption is 700W, even though I don't pay high or typical kWh costs here in Australia.

Would a rig like this, or similar, be profitable (in a very small sense) by setting a BTC price on NiceHash, to cover electricity costs and let others rent the hashpower?  Or sell real mining contracts on eBay for those that can't buy ETH on exchanges easily?

Thoughts?

Thank you for any input.
19  Bitcoin / Mining speculation / Are ASIC miners very noisy? I would like to buy... on: December 11, 2018, 04:12:10 AM
I would love to buy a couple of second hand miners, BitMain or another one, Avalon?  I am not sure what the best ones are, but I gather they are quite noisy aside from being electricity suckers, but I have a source of electricity elsewhere, and to keep them cool.

Does anyone have any advice on the less noisy miners and what the best second hand ones are to buy for a new miner?

I'm buying GekkoScience sticks for home, but the ASIC for the farm elsewhere.

Thank you
20  Economy / Computer hardware / [WTB] redux: laptop with NVIDIA card on: November 29, 2018, 01:35:05 PM
Hello,

I'm looking for a second hand laptop with an NVIDIA GTX 1050Ti graphics unit, or similar.  Not too much, they tend to be expensive.

I need a 15in or 17in laptop, smaller is better, with a good CPU (Maxwell architecture or later), NVIDIA discrete/dedicated graphics with Pascal architecture so I can practice my CUDA programming.  It doesn't have to have a big SSD or anything, a 7200rpm mechanical disk is fine.  Ideally some USB ports, USB 2 and 3, USB C type would be nice.  A place to plug in an external monitor would be good.  RAM: 16GB, or upgradable to 16GB.  All keys working, all hardware checks passing, doesn't overheat too much, good cooling, ideally it should be able to run Linux perfectly otherwise Windows 10 is fine (it doesn't need an O/S to start with, I will install).  Latest updates to BIOS and things like that.  In good condition.  Not too expensive.

I will pay with bank transfer, direct deposit, cash, BTC.  Ideally nothing over AUD $750 but I will consider more for a good GPU that still works as new.

Please PM me with details, specs, pics, what you want for it, payment method, shipping.

Thank you,
James
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