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6
votes
1answer
455 views

What is the maximum number of signature check operations a transaction script can request?

As transaction size, the number of signature checks per transaction can affect client performance and the inclusion of many O_CHECKSIG opcodes could be used as a tool for denial-of-service attacks. I ...
16
votes
2answers
9k views

What is the maximum size of a transaction?

I see from the source code (script.cpp) that there is an upper limit in the script size. It there any other limit to avoid a single transaction preventing other transactions of smaller sizes to get ...
8
votes
1answer
1k views

Confirmations on sent/receive transactions, still have 0 balance

I've tried to transfer Bitcoins from one address to another address, both of which I own. I bought a new computer, so I downloaded the Bitcoin client for OS X, and transfered from the old computer to ...
8
votes
2answers
1k views

Are private keys published to the blockchain after spending coins from a wallet?

Always I spend coins the final balance of the address that is used for transaction will go to zero. The remaining coins comes back as a change to a new address. Will this indicate that the private key ...
3
votes
1answer
272 views

Can a Bitcoin node send messages to a program on the same machine?

I`m currently programming some TCP communication in my custom Bitcoin client. I am wondering if it is possible for the official client to communicate with it if they are sitting on the same machine? ...
4
votes
1answer
862 views

Testnet fallback nodes

Is there a list of nodes on Testnet that work like the fallback nodes on the Mainnet? I am trying to test my Bitcoin communication code and I'd like to start with just one IP I can rely to be on and ...
-2
votes
1answer
168 views

What's the best way to ask a merchant to accept Bitcoin? [closed]

When I buy something off the internet, I'd like to ask the merchant to consider accepting Bitcoin. What's the best way to explain to a merchant what Bitcoin is, and what it would do for them? Any ...
36
votes
3answers
8k views

What are checkpoints?

I often read that checkpoints protect the network from a 51% attack because an attacker cannot reverse transactions made before the last checkpoint. How exactly does this checkpoint mechanism work? ...
3
votes
1answer
80 views

Bitcoin client communication time constraints

How long does the standard Bitcoin client wait between sending a message to another client and deciding that the client is not responding? That is, if someone makes a client that takes a couple ...
8
votes
1answer
294 views

When and who coined the term “mining”?

When was the term "mining" (the process of hashing, processing the transactions, adding blocks to the blockchain etc.) first used? Was it there right from the beginning of bitcoin? Who was the ...
3
votes
1answer
179 views

Is there a list of existing businesses that have started to accept Bitcoin?

As opposed to new business that sprung up and accept Bitcoin from day 1. I believe it will much shorter than the Trade wiki page, and perhaps more valuable in a certain way.
6
votes
2answers
139 views

Bitcoin promotional campaigns

Have there been any notable promotional campaigns for the Bitcoin project or some of the major Bitcoin-relatd websites?
16
votes
1answer
1k views

Given a private key, how do you get a public address [duplicate]

Possible Duplicate: How are public & private keys in an address created? I am scanning in a private key from a QR code in an app I am writting to handle the import of physical bitcoins. ...
3
votes
1answer
222 views

Listtransactions in v. 0.4.0 - different behavior?

I upgraded to Bitcoin v. 0.4.0, and I think the way "listtransactions" works is different now. Let's assume I have 10 transactions on my account. Old behavior: When I call listtransactions ...
36
votes
2answers
9k views

Nonce size - Will it always be big enough?

If I understand correctly, the block only has 4 bytes (32 bits) for the nonce. Is it possible for the difficulty to become high enough that there are no nonce solutions? If so, then what options does ...
14
votes
2answers
911 views

Does block size effect Miner's Hashing speed?

From my last question: Bitcoin Block Size - What are the rules? I learned that the block size can vary from a few kB up to a MB. This leads to my next question: Does the block size effect a miner's ...
4
votes
1answer
3k views

Mining pool hardware and bandwidth requirements

Has anyone measured what are the hardware and bandwidth requirements to run a mining pool? Are there any statistics on that per amount of active miners, their hashspeed and other variables?
10
votes
2answers
5k views

How can I measure the total hashing power of the Bitcoin network?

Is there a way to measure what is the total hashing power of the Bitcoin network at a given time? For pooled mining it isn't a problem - one can rely on statistics provided by the pool (assuming one ...
5
votes
2answers
4k views

Internet speed required to run the Bitcoin client

What is the rough estimate of internet speed needed to run the standard client? Does a faster Internet connection increase the client performance (by that I mean how fast it updates its blockchain, ...
14
votes
5answers
652 views

Why does the standard Bitcoin client not display the balance per address?

Any Bitcoin wallet holds several bitcoin addresses. Such addresses are either generated manually from the GUI addressbook or automatically collecting the "change" of a "Send" transaction. The total ...
19
votes
8answers
15k views

Where can I sell things for bitcoins?

I have old items that I want to sell for bitcoins. This includes digital content and physical objects. What websites can I use to sell them?
11
votes
1answer
3k views

How to Call JSON-RPC SendToAddress when the Wallet is Encrypted?

I'm using JSON-RPC to send commands to my bitcoind, and it works fine. Now I want to encrypt my wallet. When I've done that, I will need to send the passphrase when calling SendToAddress. How do I do ...
10
votes
8answers
1k views

What are the obstacles to pegging the value of bitcoin to an established stable currency?

Many people will not touch bitcoin due to it's historically extreme volatility. Many new currencies have pegged their value against an established currency until such time as it is sufficiently ...
15
votes
1answer
3k views

Bitcoin Block Size - What are the rules?

What is the maximum size a block can be? Is there a minimum size? Can you have a block with 0 transactions included?
3
votes
3answers
6k views

How can I participate in a mining pool that is mining Litecoins?

To date I've only participated in mining GPU-optimised crypto currencies. I wondered what happens when I pointed my GPU miner to a Litecoin mining pool worker, Litecoin being designed to be optimised ...
4
votes
2answers
1k views

Does the amount of the transaction fee affect the priority of a transaction?

I've been reading about transaction fees here. From the aritcle, Transaction priority is calculated as a value-weighted sum of input age, divided by transaction size in bytes: priority = sum(...
12
votes
3answers
5k views

Send bitcoins using just a pub and private key

If I install the bitcoin command line client for linux, can I use just a public and private key to send coins from an address? I don't want to add it to my wallet file, I just want to move coins out ...
28
votes
5answers
3k views

What would happen if a portion of the Bitcoin network was separated from the rest of the network?

Yesterday I asked a question over at SuperUser, so that I could have my facts straight before asking this question. The scenario sets the basis for this question. Regarding bitcoin, what would ...
11
votes
3answers
1k views

What is the easiest way to programmatically obtain the current USD-BTC spot price?

E.g., if I wanted to create a cron script that would grab the latest spot price every hour and store it in a local file or database, what would be the place to "scrape" that information from? (...
7
votes
3answers
2k views

Trading between different cryptocoins

Is there a website that allows one to trade multiple different cryptocoins (Bitcoins, Namecoins, SolidCoins, RuCoins, LiteCoins, etc) all in one place?
39
votes
2answers
9k views

What are Green Addresses?

What are Green Addresses? Is it true that they can solve the "confirmation delay" problem, and how does that work? Are there any drawbacks?
6
votes
1answer
2k views

Can multiple transactions transferring the same bitcoin be done in one block?

For example, one bitcoin from address A to address B, then from address B to address C, Assuming that prior to the transfer from address A to address B, no bitcoin had been sent to address B. If ...
14
votes
1answer
2k views

How to know there is a new transaction?

I am developing a program that monitors transactions. The first question is how can I know there is a new transaction? I can consider the command listtransactions. However, there is a bit of an issue ...
9
votes
1answer
585 views

Which of the open-source Bitcoin clients has the most thoroughly commented source code?

Learning from a source code is very useful at times, but it is a pain if the code is not commented well. Which of the open source Bitcoin software have the most thoroughly and understandably commented ...
9
votes
1answer
560 views

Different ways to encode Bitcoin Address

What are the different ways to encode a Bitcoin Address (both private and public) and how are they calculated? I've heard of things like firstbits, mini private key format, and I`d like to know how ...
10
votes
4answers
5k views

Does any open source software exist for an e-wallet service?

If I want to setup an e-wallet service, would I have to create it from scratch or is there any existing open source software that could be used?
17
votes
2answers
6k views

How does the Bitcoin client encrypt the wallet.dat file?

What is the algorithm used for encrypting the wallet.dat file?
16
votes
2answers
634 views

Capabilities of Bitcoins and their place in the future

I`ve recently read a presentation that mentioned a couple things about how big would be the potential bandwidth if Bitcoins would handle the transaction volume of Visa: http://www.slideshare.net/...
16
votes
7answers
9k views

Any statistics on usage of Bitcoins by region or country?

I would like to know if there are any statistics on turnover of Bitcoins for each country in the world. A very rough way would be to get a statistic on which traffic to Bitcoin.org by country.
2
votes
1answer
2k views

Can't recover MtGox password

I go to: https://mtgox.com/users/login Click on "Forgot your password?". Enter "User Name or email". Click on "Recover my password". Nothing happens. They say " We will email you a link to ...
-1
votes
3answers
212 views

Should there be a Bitcoin equivalent of Tux? [closed]

Many questions on this forum center on the idea of getting Bitcoin to go mainstream. One mechanism that the Linux team employed for their distros was the idea of a mascot - the Linux penguin, Tux (see ...
5
votes
4answers
211 views

What are some of the things that would make bitcoin better and more accepted?

More trade... more trust... more btc 'banks'...? It is such a great system. It just needs to go main stream. Any thoughts?
6
votes
2answers
155 views

Can Bitcoin help charitable organisations ensure payments go to the right people?

One common problem when organisations, such as charities or governments, donate money to good causes is that it becomes very hard to track where the money went. For example, there are accusations of ...
16
votes
5answers
2k views

Why have prices fallen so drastically around October 2011?

Any idea why bitcoin prices have fallen so in September and October of 2011? It seems like back in August, one bitcoin cost about US$17, whereas in late October, it's just somewhat over US$2.
11
votes
3answers
576 views

What is the absolute minimum amount of information required to have access to a bitcoin balance and or a wallet file?

As far as I gather a wallet can remain offline indefinitely transactions are being sent to it. The network will keep track of the transaction so that the next time it is connected it will catch up. ...
8
votes
2answers
762 views

Why isn't there a fast blockchain update inside a LAN behind a router between two Bitcoin clients?

This is the scenario: 2 computers on a LAN with private IPs (192.168.X.X) router forwards port 8333 only to one of them (the 2nd one). one computer has the full blockchain updated in its Bitcoin ...
9
votes
1answer
177 views

Is there a way to publicly raise Bitcoin funds?

What services are available to publicly raise Bitcoin funds? I'm considering setting up a Bitcoin fund that would accept BTC donations. If the fund doesn't reach a certain value after a time, I'd ...
9
votes
3answers
3k views

Pool Hopping Math

It's been discussed and argued at great length whether pool hopping is ethical, but there is no debate about whether it works - I even have some first hand experience that says it increases mining ...
15
votes
3answers
1k views

What could be the consequences of many bitcoins being lost out of circulation if people lose their wallets?

If for some reason many people lose their wallet files then many bitcoins are effectively taken out of circulation. Seen as it's not possible to tell as far as i know if bitcoins are actually ...
12
votes
4answers
835 views

What software and skills do I need?

Never having owned bitcoins I don't know how bitcoin wallets work and I'm wondering: if I buy bitcoins, what will I need to know about the software involved, and where should I keep my bitcoin wallet? ...

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