All Questions

8
votes
2answers
560 views

Miners, did Catalyst version 11.9 fix CPU usage issue for you?

Miners, did the new Catalyst version 11.9 fix 100% CPU usage issue for you? what's the best version of Catalyst to use for mining?
14
votes
2answers
2k views

How many Integer Operations on a GPU are necessary for one Hash?

I thought it was the ALU OPs like here: https://bitcointalk.org/index.php?topic=7964.0 ArtForz speaks of much higher values, though: https://bitcointalk.org/index.php?topic=4689.msg68933#msg68933 ...
11
votes
2answers
462 views

Bitcoin client IRC - a potential network weak link?

I'm currently learning more and more about the Bitcoin protocol and I`m wondering if using an IRC channel as the source to find your Bitcoin peers is a potential weak link of the Bitcoin network? ...
25
votes
1answer
13k views

When a block is “discovered” how is the nonce determined?

I know that a block is based on a random number called a nonce, but if that number is random and unknown to the miner, how is that number actually verified as the correct nonce and not some arbitrary ...
4
votes
1answer
518 views

Raw block / other messages

Where can I find a raw version of the Bitcoin blocks and other messages that are sent between the Bitcoin clients?
15
votes
1answer
271 views

Why are the mining rewards set to reduce in such dramatic steps?

The mining rewards are scheduled to drop from 50btc to 25btc. The next drop again will be from 25 to 12.5btc. In each of the steps into a new "era" the mining reward is reduced by 50%. This seems ...
8
votes
3answers
1k views

Do miners have both the incentive and ability to keep the reward at 50BTC?

There has been some concern about the fact that transaction fees (in their current form) are not an adequate replacement for the current 50BTC block reward. Gavin has said as much, as have others. ...
18
votes
2answers
1k views

How can I transfer all funds to new keys?

My wallet.dat (bitcoin-3.4) has maybe been left on a work machine, leaving it accessible to the admins there. I would like to transfer all my current funds to a new wallet. How do I do this and how ...
12
votes
1answer
2k views

Is it possible to run more than one client instance on a machine?

Is it possible to run more than one Bitcoin client at the same time on the same machine? I tried to set different working ports, but it seems not to be working.
4
votes
1answer
218 views

Where can I set the fee value for accepting transactions?

If I run a miner where can I set the fee value to accept transactions in the bitcoin client?
12
votes
4answers
2k views

Does speculation hurt bitcoin?

Related Question: Does hoarding really hurt Bitcoin Does speculation hurt bitcoin? I often hear people complain that speculation is destroying Bitcoin, or that Bitcoin will fail because of ...
25
votes
3answers
17k views

Is it possible to send bitcoins without paying a fee?

I am using the 0.4.0 release. Is it possible to send bitcoins without paying a fee? Who gets the fee ? Is it only miners discovering new blocks?
7
votes
1answer
915 views

Pricing TradeHill compared to MTGox

I've just launched a trading app that trades on MTGox and TradeHill. I'm noticing something strange on TradeHill though. Basically I get my quote and place an order directly after. The order never ...
4
votes
2answers
525 views

Is there a list of established sites that have started accepting Bitcoin?

Cross posted to Reddit. I believe the Trade page mostly has new sites, not a lot of existing ones. To me, any existing, established site that goes Bitcoin is worth more than ten new Bitcoin-accepting ...
16
votes
3answers
45k views

How to code the Simplest BitCoin CPU Miner?

How would I go about making the simplest form of a CPU bitcoin miner? I have not been able to find documentation on the whole process...
25
votes
2answers
23k views

How exactly does -rescan work?

-rescan is a command line argument that is passed to the bitcoin client after restoring wallet.dat from backup. Which files get recalculated? Which files does the rescan command read? Why is it a ...
21
votes
4answers
805 views

Is the NotHaus conviction (Liberty Dollar) relevant as legal precedent?

Bernard von NotHaus (the creator of the Liberty Dollar) was convicted of violating a U.S. federal law that forbids the minting of a currency by anyone in the U.S. besides the federal government. ...
6
votes
1answer
209 views

Will be possible to have the same key on more than one wallet?

On pull request https://github.com/bitcoin/bitcoin/pull/220 say will be possible to import/export keys. I would like to know if will be possible to have the same key on different wallets and only be ...
12
votes
2answers
298 views

Can I force my wallet to only have news keys, post-encryption?

Now that v0.4 of the bitcoin client has encryption I've gone ahead and encrypted the keys in my wallet. But I had previously made backups of my (unencrypted) wallet and those keys are the same keys ...
9
votes
4answers
352 views

How cooperative or competitive is the mining process?

As each miner works out which nonces it has tried, does it notify the network so that energy isn't wasted on re-processing the same thing by each node? Or is it totally competitive with everyone for ...
6
votes
3answers
252 views

Are there any attacks with a plurality of computing power?

There has been some discussion about possible attacks if one has the majority (over 50%) of the computing power of the bitcoin network. What happens if an attacker (or coordinated group of attackers) ...
14
votes
1answer
12k views

How do I upgrade my Bitcoin client?

I am working with an older version of Bitcoin and want to upgrade to version .4. Is there a specific way to do this? I want to try to upgrade, but am paranoid that I could lose my wallet if I do ...
6
votes
2answers
403 views

Bitcoin Intellectual Property Threats

Are any known threats related to Bitcoin intellectual property? (While unlikely, I guess one long shot threat is that one or more governments would ban the use of the technology.)
12
votes
4answers
5k views

The End of Mining

According to Wikipedia, here's a projection of expected future Bitcoin supply: Is there any effect to the dynamics of the system beyond the valuation of Bitcoins? For example, is mining required to ...
1
vote
1answer
748 views

Fraud Detection & Prevention

What are controls that are in place to detect and/or prevent fraud within the bitcoin system? Are there any know exploits, or potential threats to the system?
9
votes
2answers
419 views

Is there a chart of Bitcoin merchants over time?

Does there exist a chart documenting the number of bitcoin merchants over time, and if not, would it be possible to create one from any available data source? (I'm thinking mostly of https://en....
8
votes
1answer
1k views

How to debug a failed restore of a Namecoin wallet?

I bought some Namecoins a while back. With the upcoming Merged Mining patch, I reinstalled Namecoin 0.3.24.63 on my newly formatted computer, copied my wallet.dat from my backup to the right folder, ...
12
votes
3answers
6k views

Is there a usable Namecoin GUI client?

Is there any GUI client that is capable of trading Namecoin, and is somewhat trusted by the community?
-1
votes
1answer
5k views

Bitcoin Client says transaction is unconfirmed for 2 days now [duplicate]

Possible Duplicate: How to debug a long “0/unconfirmed” status in the bitcoin client? I made a transaction two days ago, but blockexplorer.com doesn't show the recipient address. Also ...
2
votes
1answer
762 views

How do the clients agree on the target to hash for? [closed]

Edit: They do not agree on a specific target hash. Any hash lower than or equal to the difficulty is sufficient. This means clients only have to agree on difficulty.
16
votes
3answers
476 views

What happens if the developers make a controversial change to the “standard” client?

One criticism I commonly hear of Bitcoin is that it merely transfers trust from some sort of central bank or government entity to the developers of the main project. Can anyone provide a clean ...
15
votes
5answers
1k views

How would interest and fractional reserve banking work in a limited money supply?

Suppose Bitcoin lenders (banks, creditors, investors) issue loans with interest. As the total supply of bitcoins approaches the 21M ceiling, the total amount owed in outstanding interest will exceed ...
56
votes
3answers
65k views

How to calculate transaction size before sending (Legacy Non-Segwit - P2PKH/P2SH)

I know that I pay the transaction fee per kB, so how can I calculate how large the transaction will be before I send it via the RPC api. I run a site using bitcoins, and I cannot let the user's ...
7
votes
3answers
734 views

What does TruCoin do?

I just saw that Gavin is employed with a company called TruCoin. Any idea what does it actually do besides help develop and QA the bitcoin client? The about page (odd URL) doesn't explain it much.
15
votes
1answer
963 views

Would a reduced block generation time make the Finney attack more difficult?

Related Question: What can be done to mitigate the risk of a Finney attack? The Finney attack is a form of double-spending attack where the attacker pre-mines a block containing a conflicting ...
11
votes
1answer
3k views

What strategies can an e-wallet use in order to reduce transaction fees?

I noticed that most Bitcoin exchanges (MtGox, TradeHill, ExchangeBitcoins, etc.) do not charge any fees for withdrawing bitcoins. What kind of strategies can they use in order to reduce these costs?
11
votes
3answers
668 views

What can be done to mitigate the risk of a Finney-attack?

Related Question: Would a reduced block generation time make the Finney attack more difficult? I understand that the Finney-attack is the main reason why accepting a zero-confirmation transaction ...
9
votes
4answers
3k views

Is there a “MtGox Live” alternative which supports Euro?

MtGox Live is a quite pretty live market depth graph. For some reason it only shows prices in USD. Does anyone know an equally good alternative which supports EUR instead?
108
votes
5answers
18k views

Why is 6 the number of confirms that is considered secure?

Why is 6 is the number of confirmations that is considered secure? I haven't found any mathematical explanation or otherwise that explains why it is 6 and not 5 or 7. Is there a historical reason for ...
10
votes
3answers
3k views

What software/hardware is required to mine with an FPGA?

I have been looking for a device that would allow me to mine Bitcoins without too much noise and heat. Something relatively small that I could keep in a shelf without worrying too much about it. A ...
12
votes
7answers
3k views

Are there any poker websites that accept bitcoins?

I would think that bitcoins would be a great fit for websites that allow for gambling, and with Texas Hold 'em being such a big card game it seems that a Hold 'em site might allow players to use ...
9
votes
2answers
1k views

How can determine the fundamental theoretical value of the Bitcoin based on steady state daily velocity (BTCDD)?

The VISA network (VisaNet) supports 4.4 Trillion dollars of commerce per year (2009). If we assume (somewhat arbitrarily), that the Bitcoin Days Destroyed metric approaches 50% (half of all coins are ...
13
votes
6answers
6k views

How to debug a long “0/unconfirmed” status in the bitcoin client?

When someone gets a status of "0/unconfirmed" on a transaction for a long time - what could he be doing wrong? What should he check to solve this?
9
votes
2answers
1k views

Merkle Tree hashing

I'm trying to implement my own Markle Tree, currently I'm working on getting the hashing done correctly. I've used some hashes from http://blockexplorer.com/rawblock/...
12
votes
1answer
373 views

If Bitcoin is ratified as a currency would its code be BTC?

At present it seems that the de facto code for bitcoins seems to be BTC. There has been some discussion of this over on the forums and an entry on Wikipedia, but I thought I'd ask the question here to ...
8
votes
1answer
802 views

Services paid in Bitcoin [closed]

I am interested in what other internet and other communication services out there are accepting Bitcoins for payment. I know of http://mullvad.net/ for VPN and a few others, http://www.chundle.com/...
8
votes
2answers
656 views

What does a comparison of Bitcoin Days Destroyed say about Bitcoin vs Namecoin vs SolidCoin?

The Abe blockchain explorer provides statistics for percentage bitcoin days destroyed, using the generic term "% CoinDD". Currently Bitcoin is 36.1245%, Namecoin is 41.5547%, and SolidCoin is 47.0952%...
0
votes
1answer
74 views

Best way to get the OID of an order created at TradeHill?

I'm working on my first trading script using the TradeHill API. I find it pretty annoying that the OID of an order isn't returned to you when you create a new buy/sell order. How exactly can you get ...
0
votes
2answers
869 views

Costing arbitrage between exchanges [closed]

I'm currently writing something to script arbitrage between two exchanges to test the concept. I know I can determine the difference in prices by using (ExhangeA_sell - ExchangeB_buy) <- this ...
21
votes
3answers
11k views

How do I implement a Merkle Tree?

I`m slowly implementing some Bitcoin protocols, and I'm not sure how to properly understand the Merkle Tree from the Bitcoin wiki: https://en.bitcoin.it/wiki/Protocol_specification#Merkle_Trees I have ...

15 30 50 per page