to help development I enlist my 20gh/s farm for testnet as a per request basis if people need something tested real quick.

send me a pm and I'll flick the farm over to testnet until it generates a block.

Yes, I'm greatly interested in this as well. while we all would want to generally avoid spending the same coins, it is still possible that we do and during design phase I foresee this as an problem so I bought it up hoping for some type of solution.

I suppose the real question is if two people spend the same coin, assuming there's no other network and node type of attack involved, how long does it take for the bitcoin network to valid one transaction, therefore invalidating the other one? how SHORT can this be? 1 confirmation on a transaction? or is it something else completely. I also feel like I'm missing something.

@etotheipi

I see your reverse problem, I think that could be solved using a ping back from the blockexplorer to update the true value of bitcoins associated with the address, which is something the client currently doesn't have but shouldn't be too hard to add.

Cheers

wait so you mean it days a "day" technically to verify the validness of a TxOut? I thought whoever spends it first gets confirmed by a block first, which is in around 10 minutes?

now is it possible to write a custom client of sort to check against something like this? so the service will continue to function without it's biggest draw back which is double spending.

e.g.
A loads address pair to said SERVICE, how can and when can the service know the coins are valid? soon as 1 confirmation comes? or can it wait a certain time until it knows there has been a double spending that had happened and make this transaction invalid?

while I just realized this doesn't affect this services at all since in theory person B just won't get paid, but users would still able to send coins via this service online with little information as the key pair and only expose very little information to a third party, which was the whole goal.

but it'll be an interesting answer to get for the concept, how does/how fast can clients detect double spending attacks, or become aware it self has become a victim of a double spending attack.

cheers!

@etotheipi,

Thanks I understand how conceptually it works, I'm just wondering if the client and/or network will throw some sort of notification/error for B.

@Maged

damn I was afraid of that.

I guess I should elaborate a bit. I was thinking of writing a front-end service to a node where you input both the address and the private key to spend just those coins linked to that address, much like a wallet except the server will never have access to the coins until you give them access. another idea is to maybe send the remaining coins to another adress(which is secure) so at most the "evil" server can only steal w/e address/key pair you share to them.

Thanks for answer! also if anyone have idea and thoughts for said above I'd love to hear.

Let's say in a scenario where A and B both spends the same coins. and A is faster(earlier time stamp, assuming no block based attack were also executed.)

What would B see? say in his client for example, what indication would the bitcoind give to B that the transaction failed, would it not confirm? or will it say something else.

Thanks!

p.s.
feel free to talk about other double-spending related things in this thread.

what does changing the payout on the /stats page do even?

so what does this individual miner status show? do the arthor mean per pool? or is there a flexable mining proxy like feature that's built in already.


also what information should you connect to the hopper by? e.g. the username and password

The lack individual miner tracking has been putting me off from using this hopper, now I see this feature, I have a few questions.

how are the user name determined? do you connect to localhost:8337 using any username and password?

thanks.

Oh that part I'm not so sure about, I'll ask I suppose the next time I go there.

Yes, the current method of transaction is your final bill to mtGox pricing including the .65% fee = your bitcoin total.

Also bruce is a bit late with this, they have been accepting Bitcoins for awhile now; I bought food there about a month ago.

Yeah.. bitHopper isn't really suiting my needs considering I have a bunch of workers I need to track individually, I'll put a bounty as well as make a fork this weekend.

why not just share the link so everyone who bother to do research will benefit?

I see.


I thought that was changed, most miners supports full url PL.

I been doing some research into the Long Polling issue, wouldn't be possible to just let the miner connect to the LP address directly instead of going through the proxy?

I don't mean to jack your thread but that's exactly what I'm trying to do over at

http://forum.bitcoin.org/index.php?topic=17167.0

I have already contacted 3 local business and got them on the know with Bitcoins, they are very excited;

and if you haven't heard, Meze Grill in mid-town Manhattan is actually accepting Bitcoin payments based on live mtGox pricing! I've been getting feedback from the owner and writing an Merchant Android app to ease the payment process.

Lots of stuff going on! not to mention some personal stuff. e.g. day job or my private pool.

seconded, I actually think the server is just being hammered or something, apparently I just got through a few second ago and printed me some data, I wrote a script to ping it every 15 minutes, thought it was up but I guess not.

http://forum.bitcoin.org/index.php?topic=17167.0

In the process of getting orders(items) up; stay tuned.

Hello, I'm proud to re-launch the bitXfieds service after some trail and errors and learned many things.

I realized the ultimate problem with Bitcoins is usability, it could matter less if it was worth $5 or $50 dollars;
it makes no difference if people don't use it aside from some quick vaporware stock trading.

So I spend some in the last week contacting a few local stores in my area (New York City),
and so far got the following stores to sell their products for Bitcoins using the bitXfieds service.

AC Gears - Headphones and other Tech Gadgets - http://www.acgears.com/
The Stand - Comics, TCGs, used/new Console Games.

I managed to work out some discounts as well e.g.

• a Magic the Gathering booster box is only 4.8 BTC.(~90 bucks)

They will be added to the website shortly.

Anyways, I plan to contact several other stores and distributors in the future

questions, comments and grievances welcomed; bitXfieds would love to know!

p.s.
Did I mention this is completely free of charge?

Master list of Mining software for easy retrieval.

• GPU
  
  • DiabloMiner - http://forum.bitcoin.org/index.php?topic=1721.0
    • Support: Windows, Linux, OSX
    • Features: Long Polling, BFI_INT
  
  
  • poclbm - http://forum.bitcoin.org/index.php?topic=1334.0
    • Support: Windows, Linux
    • Features: Long Polling, BFI_INT
  
  
  • hashkill - http://forum.bitcoin.org/index.php?topic=6819.0
    • Support: Linux
    • Features: Long Polling, BFI_INT, Auto Reconnect
  
  
  • Phoenix - http://forum.bitcoin.org/index.php?topic=6458.0
    • Support: Windows, Linux
    • Features: Long Polling, BFI_INT, Auto Reconnect
• CPU
  
  • Jgarzik - http://forum.bitcoin.org/index.php?topic=1925.0
    • Support: Windows, Linux
    • Features: ???
  
  
  • Ufasoft - http://forum.bitcoin.org/index.php?topic=3486.0
    • Support: Windows, Linux
    • Features: Long Polling, Failover
• FPGA
  
  • FPGAminer - http://forum.bitcoin.org/index.php?topic=9047.0
    • Support: Windows
    • Features: N/A

sigh, I usually lurk, and been here FOREVER I can't believe now I ACTUALLY HAVE to spam to post correctly...