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8 votes
3 answers
11k views

What is the cheapest Cash-to-Bitcoin Service? [closed]

There seems to be a few services to purchase bitcoins from out there, as in bitinstant, MtGox, bitcoin.de, etc. I would like to know if someone has looked around to find the one with the cheapest ...
Manuel Schweigert's user avatar
5 votes
1 answer
483 views

What would happen to the Bitcoin network if all miners simultaneously stopped their mining efforts?

If every single Bitcoin miner were to stop mining altogether, how would this effect the Bitcoin network?
Frank Michaels's user avatar
5 votes
1 answer
379 views

Bitcoin-qt falls behind on blockchain, how to replace?

On Apple Mac, bitcoin-qt is 14 days behind. Never approaches current time. Have downloaded current blockchain from trusted source. Where to install? What procedure?
Gregor Millovovich's user avatar
4 votes
1 answer
118 views

Limits to the number of accounts?

I wonder: is the built-in accounts facility scalable enough that you can assign each newly minted address to a different account? Or am I going to run into hard limits, or a database that becomes too ...
Jon Smark's user avatar
  • 195
2 votes
2 answers
3k views

Effects of mining pools paying for stale shares/work

Some mining pools pay for stale shares / proofs of work, and others don't. If a pool pays for stale shares, how does it affect individual miners? What about the pool? Related: What are stale shares ...
Dr.Haribo's user avatar
  • 8,439
3 votes
1 answer
2k views

Blockchain.info Receive Payments API problem

I am building a little online app to accept bitcoin payments in my website. I have a blockchain.info wallet and I am following their Receive Payments Api, which can be visited here: http://blockchain....
flaab's user avatar
  • 854
23 votes
2 answers
28k views

What is the extraNonce?

This question helps identify the various components of the getwork "data" field, but I'm curious where the extraNonce comes from. My hunch is it's the first four bytes of the second half of the data, ...
ConstableJoe's user avatar
18 votes
4 answers
43k views

Can casual people still mine for bitcoins, now that the difficulty is much higher than it was?

Can casual people still mine for bitcoins? As of October 2012, the difficulty seems very high, being over 3,000,000. I've seen a ad for bitcoins, and watched the video. It said I could mine for them ...
Rook Ward's user avatar
  • 181
-1 votes
2 answers
13k views

I cannot send bitcoins from my block chain wallet because I don't have the private key. Where is it located?

I didn't create a private key for my bitcoin address and am unable to do anything with these coins. How do I resolve this issue?
susan's user avatar
  • 15
4 votes
1 answer
2k views

What are midstate and hash1 used for in mining?

The first answer here does a good job explaining how the SHA-256 function requires more than one input (an initial one is specified by to the SHA-256 specs). As far as I understand it, the "midstate" ...
ConstableJoe's user avatar
4 votes
1 answer
97 views

Time series data for issues listed on the (now defunct) GLBSE

I would like to get the following data for every issue ever listed on GLBSE: Time series of closing prices since IPO to de-listing (or closing of GLBSE), Date and quantity of initial and secondary ...
paralogical's user avatar
2 votes
2 answers
2k views

Does solo mining with multiple computers require different generation transaction addresses?

I've heard that what prevents the fastest computers from almost always dominating pools is that each miner is hashing different data because of the generation transaction. However, if I solo mine with ...
ConstableJoe's user avatar
4 votes
1 answer
1k views

How is the endian conversion done?

This answer seems simple, but I'm finding mixed answers. This question describes the conversion from little-endian to big-endian hex strings (or vice-versa) as switching the order of bytes in every ...
ConstableJoe's user avatar
7 votes
4 answers
8k views

How do you get the OP_HASH160 value from a bitcoin address?

I'm trying to sign a coinbase transaction. I know I need to use 76 A9 14 (HASH160) 88 AC but I don't understand how to create the HASH160 (20 byte) from a bitcoin address.
user789235's user avatar
5 votes
1 answer
634 views

What is the reputation of bitfloor?

It seems that bitfloor is a well designed trading platform, and a competitor to MtGox. However, the trading volume is low. How long has bitfloor been in business? Have there been any negative ...
B Seven's user avatar
  • 861
4 votes
2 answers
19k views

Who accepts Moneybookers/NETELLER?

Because I don't have any rep. and the chargeback issue, no one will buy my Moneybookers(USD) or NETELLER(USD). Is there an exchange that will?
abrkn's user avatar
  • 240
-3 votes
1 answer
686 views

Should the current value of 1 BTC really be $2.50 USD? [closed]

The real value of a currency depends on the value of the goods that can be purchased with it. If we assume the majority of bitcoin transactions for 'real' goods (not currency speculation) are on silk ...
UpDwD5gN's user avatar
3 votes
2 answers
10k views

How can I buy bitcoins using Western Union (October 2012)?

I would like to use Western Union to buy some Bitcoins. I have carefully read Bitcoin's wiki page about buying Bitcoins now I'm after users' input about which service they would recommend. There's a ...
Bencori's user avatar
  • 33
2 votes
1 answer
486 views

Which exchanges still accept USD wire transfers? (Oct 2012)

Are there any exchanges left accepting USD wire transfers? I heard mention of sending to Dwolla and then transferring to Intersango, but only for U.S. citizens.
abrkn's user avatar
  • 240
4 votes
1 answer
2k views

What is the structure of blk001.dat and blkindex.dat?

Can anyone tell me where I can read about the structure of the files blk0001.dat blk0002.dat blkindex.dat I know that in these files bitcoin is saving all the information about transactions. I ...
Salvador Dali's user avatar
13 votes
2 answers
910 views

How much would it cost for a government to undermine Bitcoins?

Articles by for example the Economist stating that Bitcoins are being used for drug trading (Silk Road), I believe that the biggest risk to Bitcoins is that a government will pull a stunt similar to ...
David's user avatar
  • 3,454
19 votes
1 answer
2k views

What is the status of hierarchical deterministic wallets (BIP32)

BIP32 specifies hierarchical deterministic wallets, where a master seed fully determines a whole tree of keypairs that can be arbitrarily branched. It also introduces the notions of internal and ...
Noah's user avatar
  • 1,479
8 votes
2 answers
3k views

What is the format of coinbase input scripts?

The input script of the coinbase transaction of block number 1 (right after the genesis block) looks like this: 04ffff001d010b How do I recognize this as a coinbase transaction? Do I simply know ...
Jan's user avatar
  • 451
2 votes
2 answers
379 views

How can Bitcoin be adopted as tradeable currency pairs on Forex?

There are Forex clearing-houses all over the world. How can we have a Forex clearing-house offering Bitcoin as tradeable currency pairs?
John Smith's user avatar
24 votes
2 answers
15k views

Bitcoin URL scheme

What is the URL scheme that is used by Bitcoin to copy transaction information directly into the client? Which versions of Bitcoin clients support it?
ThePiachu's user avatar
  • 43.1k
10 votes
3 answers
3k views

Why did GLBSE close?

I went to https://glbse.com/ and see it is closed. It was a stock exchange for shares of companies denominated in Bitcoins. Does anyone know why it closed?
B Seven's user avatar
  • 861
3 votes
2 answers
898 views

Does the public key associated with an address become part of the public record after it has been used to spend?

Since bitcoin addresses are hashes of public keys and not public keys as such, if one wanted to craft a message that could be decrypted by the generator of an address, that can't be done just with an ...
david nicol's user avatar
27 votes
4 answers
39k views

What is a double spend?

What is a double spend? As someone who uses Bitcoin, what do I need to know about how the Bitcoin system prevents double spends? Are there still circumstances where they can occur?
Dr.Haribo's user avatar
  • 8,439
7 votes
2 answers
134 views

Ideal prompt to show to the customer

I am selling SASS solution on my website. How do I ideally educate customer to use bitcoin, which convince them to use bitcoin instead of paypal or other methods.
iamgopal's user avatar
  • 171
1 vote
0 answers
1k views

Bitcoin client fails and reports some database recovery error

I am looking for somebody to help me fix my Bitcoin client, it is corrupt, reads : "A fatal error occured. Bitcoin can no longer continue safely and will quit. EXCEPTION: 22DbRunRecoveryException ...
nico1234's user avatar
3 votes
1 answer
663 views

What does the poclbm output mean?

I have 3 graphics cards mining with poclbm (no external pool) and they all have pretty much the same output: MYSERVER:MYPORT [141.642 MH/s (~0 MH/s)] [Rej: 0/0 (0.00%)] what does the "~0 MH/s" mean?...
user1745's user avatar
8 votes
2 answers
675 views

Does the U.S. Securities and Exchange Commission govern Bitcoin?

Do SEC regulations apply to: Exchange of Bitcoin for US dollars Investing in companies with Bitcoin An exchange that sells shares of company stock for Bitcoin Bitcoin futures contracts
B Seven's user avatar
  • 861
5 votes
2 answers
2k views

What happens if I force quit a bitcoin wallet application before it finishes synchronizing?

I ask because upon initial install, this program (newest version) is PAINFULLY slow, and slowing down my system extremely, toward the end of the 6k block mark. I'm wondering if you force quit the ...
Kirk's user avatar
  • 51
11 votes
1 answer
645 views

What mathematical property links the Armory chain to the public/private keys?

According to the Armory site the Public Keys needed for the Bitcoin addresses can be generated without having access to the Private Keys, which ideally are stored on a completely different computer. ...
cdecker's user avatar
  • 9,508
5 votes
2 answers
1k views

How will a massive increase in hashpower affect orphan rates?

Difficulty always lags behind a little. It is also limited in how large adjustments it makes each time. What if the (global) hashrate doubles overnight? What if it quadruples? How much can we expect ...
Dr.Haribo's user avatar
  • 8,439
2 votes
0 answers
2k views

Why isn't bitcoind listening on its rpc port?

I run sudo netstat --ip -lpa | grep bitcoin After starting the bitcoin daemon and all I get is the 8333 port and the connections with other peers. But when I do the same but with | grep namecoin, I ...
rafael.js's user avatar
  • 153
2 votes
1 answer
2k views

What is the store that sells the famous alpaca socks for Bitcoin?

In the now-sort-of-viral Bitcoin video, one notable mention of Bitcoin use was to buy alpaca socks. What is the store that sells or used to sell those iconic socks for Bitcoin?
ThePiachu's user avatar
  • 43.1k
4 votes
1 answer
429 views

How do mining pool payout methods affect the cost of executing a block withholding attack?

I'm wondering how each payout method (PPS, DGM, PPLNS, Proportional, etc) influences the cost of executing a block withholding attack. Does it matter how the payout method places variance between ...
Dr.Haribo's user avatar
  • 8,439
17 votes
2 answers
9k views

What is a block withholding attack?

How can a block withholding attack be performed, what would be its purpose and who is it a danger to? Edit: when I posted this I was thinking about withholding a block you mined in a pool. But ...
Dr.Haribo's user avatar
  • 8,439
41 votes
2 answers
18k views

What is a Finney attack?

What is a Finney attack? Extra points for explaining its purpose, the prerequisites for it to be possible, how the attack can be performed and the origin of the name "Finney attack".
Dr.Haribo's user avatar
  • 8,439
8 votes
4 answers
3k views

How can one earn some Bitcoins with minimal skill requirements?

This issue came up during a chat on this answer to a question asked by a new Bitcoin user. Lets say I am new to Bitcoin and don't want to go through the hassle of exchanging money for coins quite yet....
ThePiachu's user avatar
  • 43.1k
5 votes
5 answers
3k views

Are there any active Bitcoin leveraged trading platforms available?

For awhile Bitcoinica was a very popular leveraged trading service, but it got hacked and closed down. Are there any more services like that still functioning in the Bitcoin ecosystem?
ThePiachu's user avatar
  • 43.1k
2 votes
2 answers
3k views

Is it possible to earn BTC by processing transactions?

Where does the money go? Is it possible for any person to setup his wallet application to process transactions and make some more BTC?
Andrei0427's user avatar
8 votes
2 answers
2k views

How many addresses can be handled reliable in one wallet?

I am working on a project which may end up generating a few hundred (or even more) bitcoin addresses a day. From my understanding in theory there is no limit on the number of bitcoin addresses in a ...
TripleSpeeder's user avatar
5 votes
5 answers
21k views

My client stopped synchronizing, how can I access my wallet?

My wallet has been stuck synchronizing for 21 days, my transfer is in the block chain but I can't get it to sync with my wallet. I've closed firewalls, uninstalled and reinstalled QT with back up and ...
Glenn's user avatar
  • 51
12 votes
5 answers
5k views

What would happen if you send bitcoins to a non-existent Bitcoin address?

If one were to send bitcoins to an address that has not been created yet, what would happen? Would the coins be lost forever? Would they just sit there until the address and key pair are generated?
Sam Weinberg's user avatar
1 vote
4 answers
469 views

Freelancer.com-like website but based only on BC payments using some sort of escrow-like system to make sure that employer has enough money?

Can a project similar to Freelancer.com or elance.com but based only on BC payments be created or the implementation of BC transfer between the employer and the freelancer would be too complicated? I ...
Derfder's user avatar
  • 239
11 votes
11 answers
5k views

Any books about Bitcoin?

Thanks for any link/author+title. I prefer max. 2 years to the past if possible. If you know about some book that will be published in the near future, you can mention it too.
Derfder's user avatar
  • 239
4 votes
2 answers
43k views

How does bitcoin make profit?

I am wondering how the Bitcoin program makes profit if there are no advertisements or taxes? How do the owners make money off of this?
Griffin Harris's user avatar
8 votes
2 answers
5k views

Can wallets be shared by different machines?

I have a bitcoin client installed on machine one. Let's say it has 5 coins in there. I then have another machine, with another client on it. Can both machines see the same wallet? Do I have to have a ...
Andrew's user avatar
  • 81

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