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10
votes
2answers
2k views

Using QR codes for bitcoin giveaway

Suppose I wanted to have a bitcoin treasure hunt, where QR codes were used. The first person who scanned a given QR code should receive some preset amount of bitcoins. Is this possible? (Preferably ...
19
votes
2answers
3k views

How does a client decide which is the longest block chain if there is a fork?

Is it only the block height or is it the effort that went into the forks? In other words: does this decision account for different difficulties?
9
votes
1answer
935 views

Is there an online wallet service that will allow me to access an rpc server?

Let's say I have an online eCommerce solution running with a plugin that is designed to connect to a bitcoin daemon running on the same server, but I am too cheap to hire a vps or dedicated server, so ...
30
votes
3answers
3k views

Are there algorithms that could have been chosen for mining that balance CPU/GPU?

The mining algorithm for Bitcoins (and most alternative but similar currencies as well) is purely computation hard, but not decision hard or memory hard. This caused the unexpected effect that GPUs ...
24
votes
6answers
3k views

Can a bitcoin be destroyed?

Its the hypothetical future and BTC2 is being designed. Everyone loves BTC2 and no-one wants the old BTC1 any more. People who have BTC1 would be annoyed that their assets are suddently worth a lot ...
14
votes
3answers
1k views

Bitcoin usage charts

There is a lot of data out there about BTC prices, but are there any simple charts which show how much is Bitcoin really used? Something like number of Bitcoin transactions per day/week, or daily ...
24
votes
4answers
4k views

Why don't the timestamps in the block chain always increase?

The timestamps starting at block 145044 are: 145044: 2011-09-12 15:46:39 145045: 2011-09-12 16:05:07 145046: 2011-09-12 16:00:05 // ~5 minutes before prior block 145047: 2011-09-12 15:53:36 // ~...
8
votes
3answers
3k views

How does the mining process support the currency?

Why is mining Bitcoins necessary? Is it essentially a distribution mechanism to ensure Bitcoins are not held by a few (wealthy) individuals from the get-go who might just hoard Bitcoins rather than be ...
15
votes
3answers
1k views

What happens once mining speed gets close to zero?

According to Wikipedia The number of Bitcoins created per block is never more than 50 BTC, and the awards are programmed to decrease over time towards zero, such that no more than 21 million will ...
5
votes
5answers
648 views

Will merge mining patch make Bitcoin network mining power available to anyone?

I think Namecoin has a good value, but while I think Vladimir overestimates the inflation effect of merged mining, I still mostly agree with his post, which is negative towards uncontrolled merged ...
11
votes
2answers
587 views

In a double spend attempt, how is the valid transaction chosen?

Suppose I publish the private key of an address that contains 1 bitcoin. If two people try to transfer this bitcoin to another address before a new block is found, who gets it? How is this decision ...
12
votes
1answer
1k views

How do Bitcoin clients determine the number of confirmations a transaction has?

The protocol specification doesn't seem to address this.
9
votes
2answers
947 views

Where in the world is bitcoin mining the most profitiable? [closed]

This is a question for Bitcoin miners. High cost of electricity can really cut down on the profitability of Bitcoin mining. I want to know what geographic location has the cheapest electricity and ...
119
votes
10answers
41k views

How much will transaction fees eventually be?

Some people keep evangelizing that Bitcoin transaction fees are much lower than in PayPal or with credit cards. However, once nearly all 21 million bitcoins have been mined, the network will still ...
6
votes
4answers
758 views

Bitcoin client which doesn't use wallet.dat?

Is it possible to use Bitcoin client without wallet.dat file, by entering your addresses and being able to see the balance, but without the ability to spend bitcoins? I know that it's possible to ...
18
votes
5answers
15k views

Will mining significantly increase the power consumption of my PC?

I have a PC that is always on 24/7. I use it as an SSH and backup server, and it has a modest, not-too-great GPU that sits idle most of the time. I hear a lot of talk about mining not being cost-...
8
votes
9answers
2k views

Can I buy/sell a lot of bitcoins without moving the price?

I am curious about how to acquire a lot of bitcoins (or similarly move a lot of bitcoins) without hitting the bid/ask I don't care about blockexplorer, I am just curious about price discovery are ...
6
votes
4answers
775 views

Why isn't transaction replacement supported?

The wiki article on contracts talks about the best stuff you can do with delays and replacement. (Lock time and sequence numbers, respectively.) But according to the documentation, replacement isn't ...
52
votes
4answers
30k views

What keeps the average block time at 10 minutes?

I've been told "the network" sets the difficulty level such that there will be one new block mined every ten minutes. I imagine the rich would instead prefer to keep difficulty as high as possible to ...
45
votes
1answer
6k views

What do the different .dat files contain?

What data do different Bitcoin .dat files contain? How about the other files in the same folder? The wallet.dat file is somewhat documented and there are some ways to convert it to human-readable ...
5
votes
2answers
404 views

What incentive is there for a miner to not include a bad transaction?

'A' has got 1BTC legitimately. He sends out a transaction to transfer that one bitcoin to 'B' with a 1BTC transaction fee added on. (i.e. a bad request.) 'C' is a miner who cares nothing for ...
166
votes
5answers
226k views

What are “bitcoin days destroyed”?

The concept of bitcoin days destroyed has been proposed as a measure of bitcoin volume. However, I don't think the bitcoin wiki really explains the idea very well. What is the purpose or advantage of ...
18
votes
2answers
3k views

How to start programming your own Bitcoin client?

I want to develop my own Bitcoin client in a language that is not yet supported. Are there any resources that can be referenced to help me, or any other future developer with the task, or is the ...
7
votes
3answers
3k views

How do I read the contents of wallet.dat in C#

I'd like to be able to add, remove, export etc. keypairs from my wallet.dat file. Looking over the source code of pywallet it doesn't look like such a tough task, but of course it's not as simple as ...
6
votes
1answer
2k views

Do any vendors sell good mining rigs? [closed]

I'd like to buy a mining rig, something like 4 5850 cards, preferably more. I'd rather not build it myself. Are there any vendors who sell such machines at a reasonable price?
4
votes
1answer
175 views

What is the “Maintenance” amount referring to on the bitcoin exchange Bitcoinica?

I have tried out Bitcoinica, and although it is complicated i like it a lot! What confused me is the "Maintenance" amount shown in the Account overview. It looks like it is not explained on the ...
6
votes
5answers
328 views

What forums or websites have an active bitcoin section?

Which websites have active bitcoin communities with discussion that is going on?
3
votes
4answers
594 views

What OpenCart plugins are available or in the works for Bitcoin transactions?

I've installed the walletbit module in my installation of OpenCart but any others would be appreciated, especially if someone's working on MTGox/Tradehill integration! Is there much in the works or ...
14
votes
3answers
4k views

Is there a list of available APIs for Bitcoin exchanges?

So far I have seen some Perl modules; Finance:MtGox and Webservice:MtGox for interacting with Mt.Gox, a Ruby gem for Mt.Gox and a Python based command line client for again, Mt.Gox. I'm wondering if ...
5
votes
3answers
701 views

Are there statistics on how Bitcoin holdings are spread among addresses?

I'm aware an address can belong to multiple people, and one person can have multiple addresses. Still, I'd like to assume the number of accounts per person is O(1) on average. Are there statistics on ...
9
votes
1answer
3k views

How would I hand code a Bitcoin transaction

Form the Bitcoin Wiki - Transactions I see a transaction has the following format. Input: Previous tx: f5d8ee39a430901c91a5917b9f2dc19d6d1a0e9cea205b009ca73dd04470b9a6 Index: 0 scriptSig: ...
6
votes
4answers
2k views

How do I develop web applications for Bitcoin?

Although similar to this question about mobile app development, I would like to know how I should go about the development of web applications that make use of Bitcoin. It can be assumed that all the ...
71
votes
7answers
68k views

Can I download the whole block chain from somewhere?

Every time I turn on the Bitcoin client it takes days to catch up with the block chain. Are there alternatives to getting it trickling through the peer-to-peer network? Can I just download it ...
11
votes
2answers
4k views

What are the steps in building bitcoind on Mac OS X 10.6?

Following the instructions in build-osx.txt (which seem sadly out of date) leaves me without a file named libboost_system.a. Here is how I built boost: % cd boost_1_42_0 % ./bootstrap.sh % ./bjam ...
25
votes
2answers
3k views

In order to reduce fees, can I 'consolidate' my wallet by sending the entire balance to a new address in the same wallet?

My balance is currently made up of lots of small amounts I know I'm not going to be using my bitcoin wallet for a while, so I don't care if the consolidation transaction is slow. Would creating this ...
9
votes
2answers
445 views

What prevents bitcoin from breaking down in case of a “transaction attack”

Let's say that I want to kill Bitcoin by means of a transaction attack. What in the bitcoin system prevents the following approach: I buy a limited number of bitcoin in the market. Using a small ...
18
votes
1answer
3k views

Is the timestamp in the genesis block relevant?

Bitcoin's genesis block contains this text published in The Times on January 3rd, 2009: The Times 03/Jan/2009 Chancellor on brink of second bailout for banks According to the Bitcoin Wiki, this ...
24
votes
6answers
1k views

What cryptocurrency systems predate Bitcoin, and how do they differ from it?

Although Bitcoin is certainly making strides as the first cryptocurrency to enter (comparatively) widespread use, cryptocurrency has long been a topic of discussion in fiction and academia. What ...
6
votes
2answers
312 views

How do we know how many BTC have not been spent since being mined? Any tool to see this information?

I would like to know how many BTC have not moved from the block they were mined in - never transferred or spent. (With this information I believe could have an idea of how many BTC have been lost). Is ...
3
votes
4answers
425 views

Is there an open source (free) client or code for bitcoin transactions [duplicate]

Possible Duplicate: How can I accept bitcoins on my website? I have a few websites I am working on, but is there an open source code I can use that will allow people to deposit bitcoins on my ...
7
votes
1answer
99 views

Is there a help file for the bitcoin client?

Is there a help file / man page that explains all the possible commands and arguments for the bitcoin daemon? I'm looking for an in-depth coverage of the commands seen when I do bitcoind help.
5
votes
1answer
15k views

Quick and easy mining on OS X

I am new to Bitcoins, and I'd like to get started mining, but I'm on OS X. I've tried several different mining applications, and none of them have worked for me. I've got nothing but errors. Is there ...
8
votes
1answer
1k views

What is BlitCoin?

I saw BlitCoin mentioned on this forum thread, but didn't understand what it was. Can someone explain what does it do?
10
votes
2answers
2k views

What does -keypool=1 do?

I am doing some test, and am getting weird behavior with keypool. In the 0.4.0rc1 bitcoin client: If I set keypool=1, how many times should I be able to do getnewaddress? Are there any resources ...
5
votes
1answer
1k views

Why does the Bitcoin client require at least one confirmation before I can spend?

If I accept bitcoin for payment, provide a new address for each payment and make it clear to payers that I consider payment complete only after waiting the ~10 minutes for a confirmation, is there a ...
18
votes
3answers
1k views

Can a bitcoin transaction be reversed from the receiving end?

I know this seems like a duplicate of the question 'Can a bitcoin transaction be reversed?' but none of the answers there were explicit enough as they all seemed to assume reversal triggered from the ...
24
votes
10answers
23k views

Where can I get historic data series of Bitcoin prices?

Where can I get a time series of (date, bitcoin price in USD)? BitcoinCharts no longer provide historic data, only the last 20,000 samples.
23
votes
2answers
5k views

How should you backup your wallet?

How often? Is backing it up once enough? Any best practices to storing the backup?
-3
votes
1answer
317 views

Is the cryptocurrency Bitcoin a good idea? [closed]

http://www.quora.com/Bitcoin/Is-the-cryptocurrency-Bitcoin-a-good-idea/answer/Adam-Cohen-2 As someone who studied Economics before Computer Science, to me this answer raises some very valid points. ...
6
votes
2answers
159 views

How can the alert system be triggered? Who can do it?

Since we established the alert system is included in the official client, I would like to know who can trigger the alert system, and how? Can this system be spammed (activated 1000s times per second) ...

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