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6
votes
1answer
1k views

How secure are the DNS servers for Bitcoin?

With the version 0.6, Bitcoin introduced the DNS servers that populate the initial peers for new clients. How secure are those servers in terms of being immune to takedown attacks, or injection of ...
8
votes
1answer
4k views

How do I mine with FPGAs?

I'm not entirely sure how FPGA's work... Do I simply buy a ZTEX and it mines, or do I need to plug it into a computer via USB? Can I chain them? I'm so confused.
151
votes
2answers
45k views

How do Bitcoin clients find each other?

What protocols or algorithms are Bitcoin clients using in order to find their peers? I learnt that BitTorrent clients may rely on central computers called trackers. Do Bitcoin clients need any kind of ...
12
votes
3answers
6k views

Error loading wallet.dat: Wallet corrupted

I've been using bitcoin for over a year now without issues. It's been a while since I fired up a bitcoin client though, at least a couple months. When I try running a bitcoin client (bitcoin-qt ...
7
votes
1answer
5k views

How to import a private key to an encrypted wallet (on standard client)

I have a standard client (QT client on OSX) with an encrypted wallet. I've tried to import keys with pywallet, but while it claimed to be importing them, when I ran again the bitcoin client, it said ...
3
votes
2answers
347 views

Is support@pi.uk.com the real blockchain.info's support address?

Currently blockchain.info lists that address in the "about us" page, but since the site is behaving erratically, I wonder if it's the real address or a phony one. I.e. if the site was hacked, the ...
11
votes
1answer
2k views

How many unspent transaction outputs are there?

I was wondering the other day how many unspent transaction outputs there are ? If you just keep track of the unspent transaction outputs you could import private keys, know its balance and perform ...
2
votes
1answer
489 views

What is the story behind MyBitcoin?

The name of MyBitcoin eWallet comes up quite often here and there. What is the story behind it and the attack on it they claimed occurred?
18
votes
1answer
2k views

Was a timejacking attack ever performed?

The timejacking attack appears to be a pretty straightforward attack to pull off successfully. I was wondering, whether it was ever performed and documented somewhere, or was it just theoretically ...
2
votes
2answers
55 views

When I have a problem running the bitcoin client, where can I go to get help?

Let's assume that either a bug report exists already, or the problem is unlikely to be caused by a bug. What I know so far is: This site will be appropriate for some support questions, and the ...
3
votes
2answers
592 views

What is the state of Witcoin?

There used to be a forum site called Witcoin. It was interesting in that in order to post, you'd have to pay bitcoins, and when someone replied or upvoted, you made bitcoins. The site went away. ...
3
votes
9answers
1k views

Which notable Bitcoin-related sites offer referral rewards? [closed]

TradeHill used to offer a referral bonus when you got other people to sign up with your link, and there are a couple other sites that offer similar rewards for referrals. Which notable Bitcoin-related ...
10
votes
3answers
2k views

Which exchanges are Tor-friendly?

Mt. Gox's sign-up page states: Please be advised that accessing your account via the Tor network and/or public proxies may result in a temporary suspension of your account, and having to submit ...
6
votes
2answers
603 views

Does it take longer to generate an address when I stop and restart vanitygen?

I want to generate a bitcoin address. I start vanitygen, but a power loss occurs. Now I restart vanitygen. How does this affect the time to generate the address?
4
votes
1answer
317 views

What client to use for an alternative special purpose blockchain?

Lets say one wanted to create a blockchain for the purposes of providing a scalable back-end for accounting for the trade of some arbitrary unit between people. It would not be a tradeable currency. ...
10
votes
3answers
4k views

What happens when the same wallet (private key) is used on several machines?

Let's say I copy my wallet to another computer and start using it there. What happens? Can both computers send and receive payments to the same address(es) in the wallet? A different scenario with ...
9
votes
2answers
2k views

Is there any Bitcoin Exchange that doesn't have fees for euro SEPA deposits/withdrawals?

Since Tradehill disappeared, which was really sad, I cannot find any Bitcoin exchange that let's me deposit and withdraw euros without fees, while they do for US dollars. Both Mt.Gox and Intersango ...
6
votes
1answer
291 views

What type of hedging might CoinLab be employing?

In the announcement on GeekWire that CoinLab had received seed funding, there was a statement that I found interesting: CoinLab will pay game companies in government currency, not Bitcoin, and will ...
3
votes
2answers
469 views

What can a pool operator do with their miners' hashpower?

This issue came up in this question - Are the miners concerned with what the pool operators do with their hashpower?. What can a pool operator do with their miners' hashpower?
1
vote
1answer
401 views

GUIMiner stuck at 99% Done for over 1 hour

I have just started up my client GUIMiner for the first time. It was downloading the block chain without any issue and got up to 99% where it has been stuck for the past 1 to 1.5 hours. Is this ...
0
votes
2answers
395 views

Bitcoin client 0.4.1.1 stuck at block 176947

Bitcoin client stuck. Tried to rebuild whole blockchain, but it went up to that number and got stuck again. Here's a screenshot: http://vvcap.net/db/2IR75OWyJj5AsUW7eo_i.htp Any suggestions?
3
votes
1answer
128 views

Is an attack on a local bitcoind via an img or embedded flash viable?

In this thread on the Bitcoin forums it was suggested that a local attack on bitcoind might be possible through malformed img tags or (more likely in my opinion) through embedded flash. This also ...
8
votes
2answers
23k views

What does PPS mean/stand for?

On many mining pools/bonds I see things listed as 105% PPS / 110% PPS weekly payout. What does PPS actually mean?
1
vote
0answers
249 views

Are the miners concerned with what the pool operators do with their hashpower?

I've stumbled upon a few posts on the Bitcoin forum about miners claiming that they don't care what the pool operators do with their hashing power as long as they are paid, and some others that are ...
10
votes
2answers
3k views

Historical transaction/trade ratio. Available? Useful?

Blockchain.info lists both "Trade Volume" and "Estimated Transaction Volume" in both BTC and USD. It occurred to me that the ratio of one to the other might be a useful metric in determining how much ...
10
votes
1answer
565 views

Is there time-to-failure data available for any of the BFL products?

Butterfly Labs (BFL) is offering a few mining products which look to be based on some sort of FPGA or ASIC but I can't find any reliable data on what parts they're using or their manufacturing ...
7
votes
1answer
2k views

Why do mining pools require 120 confirms for a solved block before payout?

According to this question here, 6 confirmations can be considered 'secure enough'. Some pools out there also offer payout at 100 confirms but that's still substantially higher than 6. Why is such a ...
8
votes
2answers
478 views

Is there a reliable way to measure bitcoin wealth distribution?

Given the difficult of detecting lost coins, or telling between hoarded and lost coins, it seems impossible to actually report on the real wealth distribution of the bitcoin currency.
3
votes
1answer
504 views

I sent money to a bitcoin wallet from Blizzcoin and there's nothing there?

Using blizzcoin.com I sent bitcoins to the address I have for the bitcoin wallet client, and it took forever to sync the blocks. Once it had finished I was expecting to see the money there, but saw ...
7
votes
1answer
1k views

Does Bitcoin still use the IRC channel?

I recently read an article on Bitcoin Media, that claimed: Jeff Garzik pointed out that Bitcoin-Qt no longer operates using the IRC bootstrap, and on inspection he’s right. This mainly applies to ...
9
votes
2answers
3k views

Is there a way to change the wallet.dat location without changing the entire data directory?

I know that Bitcoin supports the -datadir command line option which specifies that the wallet.dat and blockchain should be stored in a custom location rather than %appdata%\roaming\bitcoin but is ...
8
votes
5answers
10k views

Is there a Bitcoin gadget for Windows 7?

Is there a Bitcoin gadget for Windows 7, which features conversion rate with EUR? (i.e. EUR/BTC)
12
votes
1answer
3k views

Has any illegal data been saved in the Block Chain?

Has any illegal data been saved in the Block Chain, such as an illegal number, or illegal prime?
5
votes
2answers
686 views

Miner speed conversion

What is the exact ratio one would use to convert Miner speed from Hashes per second to Shares per second, assuming Difficulty 1 shares?
5
votes
2answers
648 views

Sale and Purchase Transaction Limits

Is there any limitation on the monetary size of transactions to be paid through BitCoins? I conduct a consultancy business where payments from clients can vary between about $5 for White papers to $15,...
1
vote
0answers
368 views

Runtime error when trying to send bitcoins

When sending coins, an error message pops up saying: "This application has requested the Runtime to terminate in an unusual way, please contact it the applications support team", what do?
3
votes
1answer
684 views

How does the rate of getwork requests correlate with the hashrate of a miner?

In a setup where a standard bitcoind serves full difficulty targets to some mining nodes, how can I calculate the hashrate of a mining node from looking at the rate of getwork requests? Does this ...
5
votes
2answers
998 views

How can I programmatically know when someone sends me Bitcoins?

I'm trying to set up a software system and part of it is knowing when someone sends Bitcoins to me automatically. I'm using node.js, if that matters to anyone.
5
votes
1answer
389 views

What can a person do with special private keys?

The Alert message in the Standard Client will only be displayed if it is signed with a correct ECDSA private key. Should anyone get that private key, they would be able to propagate any alert through ...
12
votes
2answers
907 views

How would we know the real Satoshi?

Should Satoshi decide to reveal his or her true identity, how can one know the person is the real creator of Bitcoin, rather than a person who hacked the forum login, email address or the like? In ...
8
votes
2answers
921 views

How does the standard client prioritize transactions?

I've heard that the standard client prioritizes which transaction to relay based on the Bitcoin Days Destroyed and the fee paid on the transaction, but what is the exact formula used to determine ...
9
votes
3answers
569 views

How popular are alternative clients?

Is there any data available on how many people use an alternative client in contrast to the Satoshi client? Alternatively, is there any data on how many times such clients have been downloaded?
6
votes
1answer
2k views

Why do some transactions take months to get into a block?

This page at bitcoincharts shows a list of transactions that didn't get included in a block yet. Many of them are from 2 or 3 months ago, even though they include a fee. What's going on? Why haven'...
13
votes
3answers
7k views

What is the exact formula for calculating transaction fees?

According to the Wiki: If the blocksize is more than 250 kB, transactions get increasingly more expensive as the blocksize approaches the limit of 500 kB. Sending a transaction when the blocksize ...
5
votes
1answer
380 views

How often does Bitcoin connect to the fallback nodes?

Does the standard client have a preference for connecting to fallback nodes (for example, by trying to have at least 1 connection to such node at all times), or are they treated like any other nodes?
6
votes
1answer
259 views

Do any pools discriminate against some transactions?

Are there any pools that openly discriminate against some transactions? For example, they only put transactions with a fee in their blocks, thus ignoring all "free" transactions?
6
votes
1answer
1k views

Does an eBay listing that accepts Bitcoin violate their payments policy?

eBay's payments policy says that the listing must accept at least one payment method that is PayPal, credit card, etc. It does not appear to say that other payment methods cannot be offered though. ...
5
votes
1answer
64k views

How do I put bitcoins in my “Wallet”?

I want to Buy something using bitcoins but I am not sure how to put bitcoins in my "Wallet". Could somebody please help me?
5
votes
1answer
747 views

Does 'simplified payment verification' work?

I was reading the original bitcoin paper where they mention a simplified payment verification scheme in section 8. I was wondering whether or not this actually works. A quick sketch: The scheme ...
2
votes
1answer
647 views

Why is bitcoin-qt not launching? Using linuxmint-12-lisa

i'm using LinuxMint-12-lisa and installed bitcoin-qt as described Installing Bitcoin-Qt on Ubuntu sudo add-apt-repository ppa:bitcoin/bitcoin sudo apt-get update sudo apt-get install bitcoin-qt ...

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