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69
votes
2answers
31k views

What is an SPV client?

I've seen SPV client mentioned in several places. What exactly is a SPV client? How is it different from a standard client?
8
votes
3answers
1k views

How much should I charge a client if they pay me in bitcoins?

The price of bitcoins fluctuates rapidly against other currencies. If I were to go to a restaurant and pay for a meal in bitcoins the price at the start of the meal would almost certainly be different ...
3
votes
1answer
9k views

Is mining faster with 2 GPUs in crossfire or with 2 PCs with one GPU each?

Is it faster to have 2 separate computers with the same graphics card but different specs, or one computer with 2 GPUs in crossfire? By math, they should perform the same im guessing at the same ...
6
votes
1answer
444 views

Bitcoin Research

I have recently been assigned to advise a student on a senior thesis in math. She has taken linear algebra, introductory real analysis, basic cryptography, and abstract algebra. Her interest is in ...
6
votes
3answers
8k views

How can I export all my private keys using bitcoind?

I know that PyWallet has a -dumpwallet but without using pywallet, how can I export all the addresses and privatekeys with the stock bitcoind? Is there an API command that lists all addresses held by ...
4
votes
3answers
862 views

Does being connected to more peers relay transactions faster?

If I'm connected to 500 peers, will I know about transactions faster than if I'm only connected to 8 peers?
6
votes
1answer
195 views

Does blockchain.info backup wallet include also the next addresses

The standard client's wallet includes a key pool of 100 extra pre-generated addresses, which are the next ones to be "generated" when you ask an extra address. Does the blockchain.info's backup ...
4
votes
2answers
433 views

Can I see all transactions not included in a block yet?

I'm running bitcoind and would like to see which transactions I've received but haven't been included in a block yet. Is that possible, or do I need to run special mining software to see that?
8
votes
2answers
6k views

Easiest way to convert bitcoins to usd [closed]

For someone in the USA what is the easiest way to convert bitcoins to usd while incurring minimal fees. I've heard of using mtgox with dwolla, or mtgox with internation wire transfer. But it strikes ...
9
votes
1answer
1k views

How can a transaction have more than one recipient address?

I see a lot of transactions which have more than one recipient address. Examples: Transaction 1 Transaction 2 Edit #1: I just saw a tag call multi-sig-transactions. It is obviously what I am asking ...
6
votes
1answer
2k views

How can one be truly anonymous without mining?

Assume that person wanting to be anonymous has reason to do so. Powerful enemies will see what is bought with bitcoins, perhaps web blog on server and domain name. Even in nations with rule of law, ...
4
votes
2answers
614 views

What is going to happen when it is totally infeasible to download the entire bitcoin transaction history?

As far as I know, the bitcoin system currently relies on the principle that all transactions are made by someone with access to the entire history of previous transactions. Since bitcoin's public ...
5
votes
2answers
3k views

Can bitcoins be split up into greater than a billion parts?

I understand that, at time of writing, splitting a bitcoin into more than 10⁸ parts is not useful. However, say that in the far future enough bitcoins have been destroyed (through deleted wallets due ...
8
votes
1answer
2k views

How can a wager with SatoshiDICE be proven to be fair?

What steps will let a person manually verify that the DICE roll was fair?
3
votes
1answer
157 views

How do I read the time field from the json-rpc calls from bitcoind?

The JSON-RPC would return the time in this format "time": 1346289025. How exactly do I read it? I don't know what kind of format it is. So what time is 1346289025?
4
votes
1answer
1k views

How to return Bitcoins to sender through Bitcoin API?

I want to get information about the creator of a given transaction through Bitcoin API. More specifically, any or all addresses they sent their Bitcoins from, so I can return some of the money back. ...
12
votes
2answers
3k views

How can I read information from the blockchain?

I don't want to use an existing service, like Blockchain.info or BlockExplorer.com. Is there some library out there that will let me read the blockchain programatically?
8
votes
1answer
4k views

Can the blk0001.dat and blk0002.dat files be deleted?

I have a Bitcoin installation on an SD card, and the blockchain files (blk0001.dat specifically) take up nearly 4 GB of disk space. Can the blk0001.dat and blk0002.dat files be safely deleted to free ...
4
votes
1answer
1k views

What is the easiest to operate/fastest solo bitcoin mining client for a cluster rig?

I'm planning to set up a rig and need a solo mining client. Can you offer me some suggestions? (Please don't just tell me that solo mining isn't worth it).
-1
votes
1answer
993 views

Is this a good time to enter mining? [closed]

This is a question that has been on my mind for a while. I was going to buy a server farm to mine Bitcoins and I was wondering if it would be practical to jump on the mining bandwagon at the current ...
8
votes
3answers
994 views

Is there a limit to how long a wallet can be offline?

I have a wallet file I backed up June 2011, and has been offline for over a year now. When I copied it back into where the files are stored with the official client, it says my balance is 0, with no ...
12
votes
2answers
47k views

If I've lost my wallet, but know my bitcoin receiving address, can I get my bitcoins back?

Although I do have a backed up wallet file, I seem to also have a second bitcoin receiving address, which doesn't seem to correspond to it. Is there a way to recover any coins associated with that ...
4
votes
1answer
304 views

How to force bitcoind to include a specific transaction as an input of another transaction?

I would want to force bitcoind to include a specific transaction as an input of another transaction. This is so as to prevent people front wanting to launch a double-spend attack on the website. The ...
15
votes
1answer
1k views

What happens when a miner does not claim all fees/generated coins?

Suppose that a miner for some reason has the generation transaction of their blocks not take all the possible coins. This can happen for a variety of reasons, almost all of which are bugs: An off-by-...
33
votes
2answers
12k views

What is the coinbase?

I searched the bitcoin wiki and found references to coinbase, but no clear cut explanation of what exactly it is. I know that miners can tag their coinbases (that is how some sites tell who mined a ...
-5
votes
1answer
2k views

What is the “best” BitCoin alternative? Especially from the pov of mining [closed]

Namecoin, Devcoin, Litecoin, Liquidcoin, Solidcoin, I0coin, Ixcoin... Which of them is the best alternative to BitCoin, especially from a fledgling miner's pov (ie. I'd like to mine some coins, but ...
8
votes
1answer
12k views

Calculating average number of hashes tried before hitting a valid block

I'm toying with the idea of starting to mine, and was wondering how to calculate how many hashes on average must be tried before one will "hit" a valid block? I'm talking about a single user (not a ...
4
votes
3answers
4k views

After sending some bitcoins, why do I have zero available to spend when I clearly didn't send my entire balance?

With some of the clients I use regularly (Multibit, Bitcoin for Android), I've noticed that, after I send bitcoins to an address, I have 0 BTC available to spend despite having perhaps a several ...
4
votes
2answers
638 views

Storage of Private Keys

Most web apps that accept bitcoin (whether it's an exchange, a gambling site, etc) provide the user with a public address for depositing bitcoins into their account. How are these web applications ...
4
votes
1answer
193 views

Add a transaction generated offline to the official client

I have a transaction that I generated/signed using a custom tool. I'd like to make sure it was generated correctly by submitting it to the official client and watching the logs to see if it is ...
13
votes
1answer
3k views

Can I addnode to blockchain.info?

Blockchain.info http://blockchain.info/connected-nodes shows a list of nodes it is connected to. Is it possible for me to add them as a node for connection?
4
votes
1answer
4k views

How to reclaim unclaimed Bitcoins sent via Blockchain.info to Facebook/Email friends?

The FAQ says What happens if the transaction is not claimed? The private key the funds were sent to is saved in the senders archived addresses. The sender can reclaim the amount at anytime by ...
12
votes
1answer
11k views

How to import my wallet?

I used to run bitcoin on Ubuntu and I have a wallet with 1 coin in it. I took a backup of my ~/.bitcoin directory which includes a wallet.dat file. Now I'm running on a mac, using the bitcoint-qt ...
1
vote
1answer
238 views

How to set up multiple client under the same address?

I want to use my all my computer to run Bitcoins, but is it possible to have it the same address so it generate under one wallet? Thanks!
3
votes
1answer
1k views

Backing up my Bitcoin wallet

I'm really new to Bitcoin (just started today) so forgive me if this question has been asked before but I can't seem to find an answer on Google. From what I understand, the Bitcoin program is capable ...
3
votes
1answer
787 views

Between which locations are transfers using Bitcoins cheaper than PayPal for 100$?

I believe that once it becomes significantly cheaper to transfer money between countries using Bitcoins, its usage will increase significantly. My question is, therefore, between which countries will ...
5
votes
2answers
606 views

Is the transaction database ever shortened?

I just downloaded the bitcoin client and the full transaction database and did not fail to notice that it took me more than a day to download and check the transaction database and that it occupies ...
4
votes
3answers
8k views

How do I buy bitcoins using a prepaid credit card? [Canada]

I live in Canada, I don't have a credit card. I want to buy a prepaid one and but some bitcoins. How can I do this? Or is there a way to use my debit card? Or even go to my bank and do it.
1
vote
2answers
214 views

Virtual currency used as alternative currency

Would it be feasible for a virtual currency to be used in the same way as alternative currencies such as Berkshares and Brixton Pounds ? Furthermore, do you think it is possible to make it independent ...
2
votes
0answers
51 views

Encouraging virtual exchange and independance from hard money? [closed]

With all the talk of economic sustainability and the dangers of infinite growth how do you think a virtual currency could be used to encourage the trade of virtual goods ? Or possibly a more efficient ...
5
votes
2answers
5k views

How do I create a Namecoin address?

My mining pool has merged with Namecoin, and I need a Namecoin address. How do I create one ? Do I need to install another client ?
3
votes
1answer
181 views

Is the current number of confirmations visible somewhere in the raw block?

Is the current number of confirmations visible somewhere in the raw block output created by blockexplorer or blockhain.info? Is this information available in the raw stream or is the number of ...
6
votes
1answer
579 views

what are vin_sz and vout_sz in tx part?

I am trying to understand the raw blocks better: vin_sz and vout_sz are some of the unknowns. does this values (sz=size?) have something to do with a number of confirmations? example: https://...
2
votes
1answer
194 views

What is the meaning of target-confirmation?

The API call listsinceblock has an optional parameter called target-confirmations. Exactly what does it mean and how does it differ from the minconf optional parameter that many other calls take? I ...
3
votes
1answer
203 views

Can OTC help lessen the cost of slippage and exchange rate risk?

Obviously one can transact currency via buying BTCs on an exchange transacting them to another person which itself sells the BTCs received on an exchange - this would limit the possibilities of ...
0
votes
1answer
461 views

Is using bitcoin for savings a risky choice? [closed]

I'd like to start saving money and there are a few options. Cash provides anonymity but it's very susceptible to steal and I must have a physical space for it. A bank account is much safer but I ...
8
votes
1answer
432 views

Is there an API for price estimation?

I need to display at my website what a certain amount of Bitcoins will likely cost. I can fetch the latest price using the MtGox API and multiply it by the amount, but for large amounts this is ...
9
votes
5answers
1k views

Specific namecoin address in merged mining

I want to do merged mining with P2Pool, and I want any generated namecoins to go to a specific namecoin address in my wallet. I haven't seen a way to configure this in P2Pool or namecoind, and Google'...
20
votes
2answers
41k views

Is it possible to cancel an unconfirmed transaction?

If you submit a transaction to the network but it hasn't yet be confirmed by a block, is it possible to cancel this transaction?
4
votes
1answer
475 views

BTC Days Destroyed, Lifo or Fifo?

Imagine I've got 100 BTC in my wallet, which I accumulated at different points of time. When spending a fraction of my BTC, e.g. 10 BTC, which one of my 100 BTC do I actually spent? The last one I ...

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