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votes
2answers
2k views

Easiest way to collect funds of big lists of bitcoin privatekeys

I am setting up an webstore where you can pay with bitcoins. Therefore I created a bulk list on bitcoinaddress.org. I save the public addresses in a database and attach one to each transaction. Then I ...
14
votes
6answers
10k views

Giving bitcoins to people as gifts

I am interested in buying bitcoins and giving bitcoins to babies as "birth gifts" and birthday presents. Assuming I've purchased the necessary bitcoins and they are in my wallet, how do I go about ...
1
vote
2answers
901 views

Why would Mt. Gox's Open Transaction method still require six confirmations?

When withdrawing using Mt. Gox, one of the checkboxes is marked "Open Transaction" and it shows that this requires "6 Confirmations". This is used if you might be paying another Mt. Gox account but ...
3
votes
3answers
535 views

Would my ISP consider my Bitcoin client to be a server?

I was reading about Google's Fiber installations, with first deployment in Kansas City. There's a controversy where the terms of service restricts what services can run on their Fiber network. Some ...
2
votes
1answer
398 views

Has LargeCoin shipped any hardware yet?

LargeCoin announced their ASIC mining technology back in March 2012, with an estimated delivery of July 2012. "ttul" in Bitcointalk, who made the announcement, also said "Expected delivery is July ...
2
votes
0answers
262 views

Is anyone working on / has implemented a “two-factor paper wallet”?

I just created this wiki page. I'm coining the term here, I think ... not sure what was it called when discussed on Bitcointalk. My question is: Has anyone implemented this "2 factor paper wallet"? ...
6
votes
1answer
264 views

What is the formal code review process of the standard client?

There are n developers with commit privileged. After one of them merges a pull request, how many eyes review that code? When? Is a complete (holistic) code review done before releasing a version? ...
3
votes
0answers
80 views

How to import blockchain.info wallet file? [duplicate]

Possible Duplicate: How to restore locally a MyWallet backup? I have blockchain.info backups, but I never test them. How do I make sure they work? What client should I load them into, and how? ...
9
votes
2answers
6k views

Is there a website that shows historic price data?

I need to find what the Bitcoin-Mt. Gox USD price was at certain historic dates and times (exact timestamp). Is there a website where I can input a specific historic date+time, and get the rate for ...
7
votes
2answers
2k views

Can I spend a coin sent to myself before it confirms?

If I spend the entire balance in my wallet to another address in my own wallet, do I need to wait until it gets one confirmation in order to spend it, or does the client know it is my own funds and ...
2
votes
3answers
763 views

Is Proof of Stake a hard-fork?

Proof of Stake is a proposed modification to the Bitcoin protocol. maaku claimed that it doesn't require a hard fork / alt chain. Is this true?
1
vote
1answer
142 views

I am reinstall my btc but balance and address not oldone?

hello sir I have getting some problem to my bitcoin client. I am backup of my old wallet.dat and again install the btc client but this new client my old address is not showing and also my balance of ...
9
votes
1answer
2k views

Why does Bitcoin use two rounds of SHA256?

Each blocked is hashed twice. Why isn't one application of SHA256 enough?
11
votes
5answers
3k views

how can I insert an arbitrary sha256 hash into the blockchain?

If I want to prove that I wrote a particular document before a certain point in time, it would be sufficient to generate the sha256 hash of the document and somehow arrange for that hash to appear in ...
1
vote
1answer
1k views

Bitcoin Block Download frozen

For 5 days now my block download has been frozen at 57%. I tried downloading a new wallet to a different computer (which did download all the way), but I can't figure out how to pull the information ...
8
votes
7answers
2k views

Is performing a 51% attack / double spend on Bitcoin illegal?

Suppose I had an ultra large ASIC from the future, and could perform a double spend on the core Bitcoin network. At this point in Bitcoin's development, it is no longer a game - there's real money ...
6
votes
1answer
15k views

How to setup pushpool?

How can I setup pushpool on my ubuntu dedi? I have bitcoind up and running with latest blocks, what's next?
31
votes
2answers
43k views

What is an “unspent output”?

What is the meaning of the term "unspent output" in the Bitcoin protocol?
9
votes
8answers
3k views

Can more than 1 block be solved per 10 mins on average (LONG TERM)?

I am wondering whether it is possible for a supercomputer to find the next 1000 blocks in a very short amount of time. Hypothetically, if a government agency concentrated a supercomputer on hashing, ...
8
votes
6answers
20k views

Is there an easy way to purchase Bitcoins?

I decided to check out bitcoin 3 weeks ago. And I have yet to buy my first bitcoin. It took a week to get a Dwolla account. Now when I go to MtGox to buy I find I need to go through even more hoops. I ...
8
votes
4answers
391 views

Psychological price

I live in Europe, and more than a decade ago our national currency was replaced by the Euro. For a few years, everyone calculated back the price in Euro to the old currency when buying something, ...
1
vote
0answers
4k views

Help setting up phoenix miner on Ubuntu 12.04 - getting a seg fault

I'm roughly following this guide. The only big difference is I'm running Ubuntu 12.04 and I used the latest version of the ATI Drivers. (I have the same cards as the guide, 2x HD5830's) When I try ...
3
votes
1answer
243 views

Are there any miners that will always include microtransactions even when no fee is paid?

There is a node that will always relay every transaction, regardless of whether its amount is acceptable and whether a fee was paid. This node is described in the Free Transaction Relay Policy page ...
14
votes
8answers
996 views

bitcoins from the future

It is likely that the Galaxy Note 2 will be launched in August. As it has taken two weeks to mine my very first bitcoin, it seems unlikely that I will have mined enough to purchase a Note upon ...
15
votes
9answers
2k views

Is there a crowdfunding site for Bitcoin?

Does a crowdfunding site like kickstarter.com exist, which accepts bitcoins instead of dollars?
5
votes
1answer
3k views

Monitor all transactions on bitcoin network - API

I am searching for a solution to monitor all bitcoin transactions (or for first ties at least for addresses inside my bitcoin client). I found http://blockchain.info/api_websocket is this really ...
5
votes
2answers
495 views

Can a miner remain anonymous?

Can you differentiate the miners from the normal clients, by doing some frequency analysis on ip-addresses that announce new blocks? Or will the new block propagate so fast around the network by ...
2
votes
2answers
305 views

Alternative incentives for miners

Currently the incentives for miners are the block-awards and transaction fees. Suppose I want to create a Bitcoin-like hash-chain for other purposes than storing coins (for example: storing messages), ...
7
votes
1answer
357 views

Does merged mining require clients to download both blockchains?

Suppose I want to start an AltCoin, and set it up for merged mining with Bitcoin. Will it require the AltCoin end-users to also download the Bitcoin blockchain to verify the hashes embedded in the ...
13
votes
8answers
2k views

Could bitcoin be destroyed if an entity cornered the market?

I know the US Government is opposed to competing currencies. It seems that it would be a rather simple solution for them to destroy Bitcoin before it grows too much by merely buying all the currency, ...
10
votes
1answer
2k views

Why does merely having Windows Media Player open double my GPU hashrate?

I'm using poclbm to mine under Windows... processor is an AMD A6-3400M with integrated Radeon HD 6250G GPU. When Windows Media Player is closed, I get a rate of 16 megahashes/second, but when it is ...
6
votes
1answer
3k views

What is “the gap limit” in Electrum?

I don't understand this explaination.
2
votes
2answers
918 views

How do I run a headless testnet on OS X?

I'm trying to develop some applications and need bitcoind, but can't seem to find a recent version. Posts seem to indicate that it's incorporated into Bitcoin-Qt, but I don't want to run a GUI just ...
4
votes
7answers
6k views

Where can I buy bitcoins from Ireland without photo ID?

My available methods of payment would be laser(Ireland debit card scheme), mastercard, visa or a bank transfer. I'm a beginner user in Ireland. I'd also prefer not to have to verify my account with a ...
8
votes
2answers
8k views

What exactly happens when a new wallet is created?

I am asking for what is being created when there is a new wallet created. And the second part of my question is considering public key. Is the public key the same thing as the address? I read that ...
5
votes
4answers
6k views

Can bitcoins be bought wholesale?

What options are available to purchase bitcoins in bulk (e.g. a buy in the range of ten thousand dollars or more) without having to mess around with a market exchange? How can it be determined if the ...
4
votes
1answer
946 views

Is there any way to install a GPU miner on ubuntu without using the proprietary drivers?

The question pretty much says it all. Any way to install a GPU miner (ATI) without A) Installing fglrx (which is a very bad driver for everyday use, and breaks my dual-monitor setup) B) Installing ...
2
votes
1answer
773 views

How to interpret mtgox chart?

What is the difference between red and green rectangle? And why there is 0% written in the chart? And also, why is mtgox only focusing for 1 month and no more? EDIT: The 0% in the chart appears ...
5
votes
1answer
113 views

How can you estimate the net amount of transactions? (deducting change)

The change is usually to a different address, and it could be more or less than the amount sent to the recipient. It seems like a crude estimate would be to just randomly remove one output (assuming ...
5
votes
1answer
192 views

Why do some generation transactions use pubkey, instead of hash?

At BlockExplorer I can see that (edit: some) generation transactions use a pubkey in the script (<key> OP_CHECKSIG), while ordinary transactions use address/hash (OP_DUP OP_HASH160 <hash> ...
4
votes
1answer
4k views

How to convert Litecoin difficulty of 6 to an expected time per block solved?

The current difficulty for mining Litecoins is about 6. If I mine them at 25kh/s, how often should I expect to solve a block with a difficulty of 6? I'd also appreciate an explanation (or formula) of ...
2
votes
1answer
2k views

Transfer between exchanges without fees

What is the best way to transfer money between exchanges without fees? I think the most obvious option is to buy a redeemable coupon at one exchange, and redeem at another. But are there any exchanges ...
4
votes
4answers
8k views

What's the best Android wallet client for bitcoin?

There are many bitcoin wallet clients on android market. What is the best considering security, interoperability and usability?
14
votes
2answers
2k views

What is the point of SIGHASH_NONE?

If I understand correctly, SIGHASH_NONE in the output input signature means that spender of this output doesn't sign his outputs. But doesn't that mean that the spending transaction is by design ...
3
votes
1answer
2k views

Bitcoin wallet taking days to receive coins

Previously withdrawing bitcoins from Intersango has only taken 24 hours. This particular transaction has taken several days and I still haven't received the bitcoins. I withdrew the coins from ...
40
votes
2answers
63k views

How can I export the private key for an address from the satoshi client?

If I want to transfer an address from the satoshi client into a different client, how can I find its private key to do so?
3
votes
1answer
125 views

Is there any complete specification of the transactions?

I see the wiki page Script, and the page on Contracts makes some remarks on things like signature numbers and SIGHASH flags, but it seems incomplete and not very friendly to someone not familiar with ...
4
votes
3answers
808 views

What are the advantages of sharing money in hosted e-wallet services?

I was a little bit shocked to learn that many (if not all) hosted e-Wallet providers combine their customers money in the hosts account, instead of just providing a service for easy access and storing ...
1
vote
1answer
1k views

How can I retrieve my bitcoins when the client crashes as soon as it begins synchronizing

As soon as the client begins synchronizing it crashes. It's stuck at 139,500 blocks left. I am brand new to bitcoin and sent $300 to an address on this client.
4
votes
2answers
210 views

How can multifactor authentication be used when there needs to be two people with access?

For a business account at a Bitcoin exchange, either of two people need to be able to send bitcoins or withdraw. This account will be configured with two-factor authentication. How can two of the ...

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