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more information dev? bounty? roadmap? teamdev?

rGyW5RGuXYaHZFZ2vGoDbFs4gvS4ZEaeYw

I had a few transactions in a row deemed "high risk" and canceled after using coinbase successfully for awhile.  After that, I stopped using it and went back to using Dwolla->mtgox.

I think it's important to keep in mind what Coinbase is: it's a startup consisting of two guys, some furniture and a few computers.  Coinbase is quirky and has some issues now, but it will probably get better with time as the company matures.  They have bitten off a big problem and they probably just don't have the staff and experience to deal with all the issues yet.  Eventually they will stumble their way making it work better and there won't be all this BS with "high risk" canceled transaction.

Bitcoin really needs Coinbase and companies like it that make the conversion from fiat -> bitcoin easier.  Dwolla->mtgox isn't the answer for most people.

In the meantime we'll just have to tolerate the quirkiness of coinbase.

Bitcoin requires trust since transactions cannot be reversed and escrow services generally aren't used.

The only recourse against seller fraud is reputation.

This guy, Yankee/Charlie, stole money from me and did not acknowledge my issue.  From this thread it's pretty obvious that he's stealing bitcoins from others.  He's dishonest, so further appealing to him is just a waste of keystrokes.

The only thing one can do is to call him out in public for it so that he can't scam others.

I don't know exactly what you're talking about.

You took my bitcoins.  You didn't give me any phone credit.  You disregarded my email and you ignored the problem description I submitted on the form on your website.

The statement "we fully refunded all your orders" is nothing but a lie.  You didn't refund my bitcoins.


I don't really know what you're talking about either.

Are you saying that a person who takes bitcoins, doesn't provide the agreed-upon service, and then simply ignores efforts to communicate about the issue isn't a scam?

FreeMoney, all I can say is that we have differing opinions about what a "scam" is.

Charlie, you must be responding to giszmo here and not me.  To date you've taken my bitcoins, NOT compelled my provider to send me an email as promised, NOT added money to my phone, NOT responded to my email, NOT responded to filling out a form on your site, and NOT refunded my bitcoins.

I tried it for the first time a couple of days ago.

I followed the instructions to send 0.4239 BTC to some address. Some time later I got a confirmation that the funds were received. The message said "You should now wait to receive a third email, which provides instructions from your carrier in order to credit your mobile phone. This email may take up to a few hours to receive."

I didn't receive the follow-up email or the credit on my phone after 24 hours. They've ignored a follow-up email as well as a message I sent from the contact form on their web site.

At best, they're disorganized and their customer support sucks. At worst, it's a scam.

I've already decided that I won't use them again. I'm interested in hearing if anyone else has successfully gotten credit.

ztex,

I bought your 1.15d card and the power supply module on the internet a couple of months ago.  I was trying to get my own bitcoin miner working, but had some problems since my hardware background isn't quite good enough.  (I write linux software drivers for Android for a living, so I have good low-level software experience but not much experience with Verilog.)  However, I downloaded your design and it is working great.  I'm getting about 150-160 MH/s out of the Spartan6 LX150.

The obvious problem is that it gets too hot.  When I first power it on it can do about 190 MHz, but as it heats up it starts dropping frequency until it gets down to 168 MHz.  The passive heatsink you supply just isn't enough for this application. It's super-hot to the touch.  Can you recommend a fansink that will work well with the 1.15d board to keep it cooler?

Thanks.

It's a ".onion" address.  You have to use and install something called Tor (http://www.torproject.org/) to get to it.

Once you've installed Tor and configured it correctly, go to this URL: *Link Removed* .  The URL won't work unless Tor is running and configured.

As an aside, Silk Road seems to be down at the moment... but it was up yesterday.  It seems to go up and down at odd times...

I had your exact same problem.  I eventually solved the problem by using a second Linux system that I happened to have.

One thing that may work is to install "persistent-less" LinuxCoin.  Then go into fdisk and re-partition the drive into two partitions, commit the partition table, and exit... then immediately unplug the drive.  This is risky because you're nuking the partition that the OS is using... but as soon as you commit the new partition table you don't need the OS any more.  Then you can plug the drive into  your win7 system and win7 will format only the first partition and leave the second partition alone.  Then once you get LinuxCoin up and running again you can set up the second live-rw partition to get persistence working.

This may or may not work, I don't know.  I can think of a couple of reasons why it wouldn't work.  You'll have to try it.

A second possibility may be to plug in two USB drives at the same time.  Use one to boot "persistentless" Linux.  Then, use that OS to partition the second drive that isn't being used by the OS.  This is safer than the method above and will almost certainly work, but requires two USB drives.

Lol, actually I did already see it, since the author announced it on this very forum.

http://forum.bitcoin.org/index.php?topic=9047.0

I'm trying to append to the init sequence to automatically run the miner after the boot is complete.

Do any of you Linux people know in what file I would put a command like that?  I imagine that the command would fail if it ran before X was completely up.

If you just want to fool around, start with this:
http://www.xilinx.com/products/boards-and-kits/AES-S6MB-LX9.htm

It's just $89.

You wouldn't be able to unroll the loop at all, though.  (fpgaminer fully unrolls the loop so it's heavily pipelined.)  You'd probably have re-use the same hardware for every step of the algorithm, so you'd get about 1/128th of the performance.  If you were clever you might be able to do more than that and have around 4 pipeline stages or so, then you'd get 1/32th of the speed.

I'd respect you if you got 1 MH/s out of it.

Still, it could be a fun project for $89.  Just don't expect to do any serious mining.

It appears to come with a crippled version of their tool chain.  However, you can download the full Xilinx tool chain at (ahem) substantially below retail value over bittorrent.

+2 gusti

Yeah, that was the ticket.  The configuration file I was changing was live.cfg, but that file doesn't seem to do anything.  I modified the default option in syslinux.cfg and then it works as intended.

Yeah, I know you said it like five times... but I couldn't figure out how to do it under windows.  Windows always wants to create a single partition as soon as you plug in the disk.  (I admit that I didn't consider trying to use the built-in disk administrator or any other options.)  Linux seems to "like" the idea of multiple partitions on a usb key than windows does.


Agreed, done.

I am having another problem now.  If I boot the system and don't select a boot mode at the first screen and just let it time out on "default" it boots the non-persistent mode.  This is true even though the configuration file for the menu indicates that it should boot to persistent mode by default... so I'm trying to figure that out now.

drgr33n, I just sent you 3.5 BTC (about $20?) to say thanks for putting this release together.

+1 gusti

I've been trying to get persistence to work for days and this was the missing data point.

The procedure I did that worked was:
1.  Put keyfob into a linux box.  Use "sudo fdisk /dev/sd-" to nuke all partitions.  Set up two partitions.  Mark the first partition as bootable.  Write the results using "w" in fdisk to write the partition table.  (replace "-" with your actual drive)

2.  Run "sudo mkfs.ext3 -b 4096 -L live-rw /dev/sd-2" to format the SECOND partition.  The name must be "live-rw", not "casper-rw" (replace "-" with your actual drive)

3.  Put keyfob into your windows box.  A prompt comes up asking if you want to format.  Press "format disk" and then "start" then "ok" to allow windows to format the disk.  It will format the FIRST partition as fat32. when you hit ok.

4.  Use unetbootin-win-549.exe.  Click the "diskimage" radio button and point it at the bitcoin iso image.  DON'T put anything in the "Space used to preserve files across reboots": leave that at zero.  Hit OK to start the transfer.  It takes a few minutes.

You're all set.  Your image should now be persistent.  (at least it was for me...)

Today, you buy $2000 worth of hardware.   Your hash rate is 1500 MH/s.  You draw 1200 watts.  A  bitcoin is worth $7.  Electricity is $0.10/kWh.  You gross $1228 a month and your electricity cost is $86 a month.  Your electricity cost is just noise.

Imagine that a year from now, the difficulty is tenfold.

At this point a FPGA rig is going to have a fraction of your power consumption.  At that point:
Your hash rate is 1500 MH/s.  You draw 1200 watts.  You gross $123 a month and your electricity cost is $86 a month.  Your net profit is $37/month.  Your electricity cost consumes most of your gross.

The guy with the FPGA array has the same hash rate of 1500 MH/s.  He draws 300 watts.  He grosses $123 a month and his electricity cost is $21 a month.  His net profit is $102 a month.

Will difficulty rise tenfold?  Will bitcoins continue to be worth $7?  Will 1500MH/s of hashing power only draw 300 watts in FPGAs?  Who knows?  I'm just pointing out the scenario where the FPGA guy can have a huge advantage.


Well, yeah.  I don't think that anyone is proposing that FPGA reference boards are the way to go.  The way to go is to do your own board design and load it up with bucketfuls of FPGAs.

Your math assumes the difficult will be constant.

Eventually, the difficulty will reach a point where the power cost is a significant portion of the mining cost.  Right now, power is about 10%-20% of the cost when doing GPU bitmining.

Let's assume that one year from now, power is 80% of the mining cost.  At that point, FPGA mining would have a significant advantage over GPU mining even if the hash rates are same.