Questions tagged [transactions]

This tag should be used for questions related to transactions. Transactions are signed messages regarding the transfer or generation of bitcoins. They are broadcast throughout the Bitcoin network and, if accepted, integrated in the blockchain.

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8
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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
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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 ...
16
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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
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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 ...
12
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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
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5answers
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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 ...
6
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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
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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 ...
43
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3answers
12k views

Why does Bitcoin send the “change” to a different address?

For example I have an address (A) with 20 BTC and send 9 BTC to address (B). Bitcoin will create a "change" portion of the transaction where the remaining 11 BTC goes to address (C). Why not send ...
6
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4answers
920 views

Is it possible to forward bitcoins without the private keys?

According to this question, there isn't an easy way to automatically send bitcoins from one address to another and I think that it might be useful. So I thought about creating a website were people ...
7
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1answer
674 views

What is op_eval?

I have been hearing a lot lately about "OP_EVAL", what is it? Gavin has mentioned it here: http://sourceforge.net/mailarchive/forum.php?thread_name=201110130938.35014.luke%40dashjr.org&...
17
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1answer
1k views

Speed of operations in the Bitcoin network

Did anyone measure how fast transactions spread through the Bitcoin network? For example, how long does it take for a newly generated block to be propagated to most active clients? Mainly asking this ...
10
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2answers
648 views

Can I hide my IP address by blocking incoming connections in the client?

I know that it is possible to find out the IP address of a transaction by connecting the client to every node in the network. Dan Kaminsky wrote: When you are connected to every node, the first ...
19
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2answers
5k views

What happens if my transaction is not accepted because I did not pay fees?

I was reading this thread about a client fork that does not force transaction fees and I noticed the big red warning saying that some coins might get lost if I am not careful. What does this mean? ...
17
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5answers
4k views

Is there a way to initiate a payment request in bitcoin?

I'm writing a recurring billing system and I want to be able to contact a customer and request a certain amount of money. Is this possible via bitcoin? If not, could a URL be provided the customer so ...
9
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1answer
2k views

Push notification of incoming transaction

Is there a way to be notified by bitcoind via the CLI that some incoming transaction has been confirmed?
7
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1answer
376 views

Can we interpret a rolling average transaction count per block as the 'adoption curve' for Bitcoin?

It is widely accepted that Bitcoin is both a transaction network, and a currency subject to speculative market action like established fiat currencies. In a sense, it is a transaction network with a '...
11
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2answers
592 views

Is there a recommended maximum number of transactions any one address should ever receive?

The pool I am with has sent about twenty transactions to one address I gave as a 'send to' addy. Could this one address just go on and on taking more and more of these transactions? A hundred of them? ...
25
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3answers
18k views

Is it possible to send bitcoins without paying a fee?

I am using the 0.4.0 release. Is it possible to send bitcoins without paying a fee? Who gets the fee ? Is it only miners discovering new blocks?
-1
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1answer
5k views

Bitcoin Client says transaction is unconfirmed for 2 days now [duplicate]

Possible Duplicate: How to debug a long “0/unconfirmed” status in the bitcoin client? I made a transaction two days ago, but blockexplorer.com doesn't show the recipient address. Also ...
11
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1answer
3k views

What strategies can an e-wallet use in order to reduce transaction fees?

I noticed that most Bitcoin exchanges (MtGox, TradeHill, ExchangeBitcoins, etc.) do not charge any fees for withdrawing bitcoins. What kind of strategies can they use in order to reduce these costs?
13
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6answers
6k views

How to debug a long “0/unconfirmed” status in the bitcoin client?

When someone gets a status of "0/unconfirmed" on a transaction for a long time - what could he be doing wrong? What should he check to solve this?
9
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2answers
336 views

Standing Orders, Is it possible with Bitcoins?

Is there a service out there, or is there any intention to integrate Standing Order type transactions into the client ? (Every 30 days transfer 0.2BTC to a specific address for example).
40
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2answers
6k views

What is the coin selection algorithm?

When creating a transaction in the standard client, what is the algorithm used to determine which unspent outputs will be used as inputs? Has this changed since the first version? What different ...
5
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1answer
574 views

How are transactions in discarded forks merged back into the blockchain?

It sounds like transactions in discarded blocks are propagated back to the network to be included in the next block to be generated, is that the case? If so, is that triggered in the client when it ...
14
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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 ...
11
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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
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1answer
1k views

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

The protocol specification doesn't seem to address this.
6
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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 ...
5
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2answers
403 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 ...
3
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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 ...
9
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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: ...
25
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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 ...
3
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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 ...
5
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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
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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 ...
48
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3answers
9k views

How does change work in a bitcoin transaction?

It seems that when you send a bitcoin transaction, all the coins in the sending address are spent in that transaction, divided into the amount that you intended to send, and "change", which goes back ...
21
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1answer
3k views

What does the Bitcoin client do when it receives conflicting transactions?

I've been assuming that the second transaction will simply be discarded as invalid, while the first waits at 0/unconfirmed until it actually gets into a block (requiring a "-rescan" or similar if the ...
28
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5answers
5k views

Has there ever been a successful double spend attack on the Bitcoin network? If not, is it really necessary to wait for confirmations?

There is a lot of concern about waiting for confirmations to avoid a double spend attack, but has there ever actually been a double spend attack? It seems to be that there are two types of double ...
17
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3answers
3k views

Is there a way to undo transactions with a “too low” fee?

Suppose we reach a state where only transactions that pay a fee are accepted by miners. Further supposed that someone created a transaction using an old/odd client that allowed them not to send any ...
7
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1answer
322 views

How does a recipient know they can satisfy the transaction script to spend their bitcoins?

The wiki page on the transaction script says: The party who originally sent the Bitcoins now being spent, dictates the script operations that will occur last in order to release them for use in ...
24
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2answers
4k views

Useful alternative Bitcoin transaction scripts

The Bitcoin wiki describes a transaction's script as something that describes "how the next person wanting to spend the Bitcoins being transferred can gain access to them". The script for "a typical ...
15
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3answers
989 views

Can the number of transactions per second ever overwhelm the network?

I'm coming at this from a point of view that assumes Bitcoin has been widely adopted as a currency worldwide and is essentially mainstream. Every day people are using Bitcoin in the same way that they ...
19
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1answer
2k views

What protection does Bitcoin have against Denial of Service (DoS) attacks?

What protection does Bitcoin have against DoS attacks? Could you bring down a node by flooding it with data? What happens if someone starts flooding the network with legitimate, yet nonsense, ...
48
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7answers
10k views

Is there any way to track an individual bitcoin (or satoshi)?

For example, if I wanted to "collect" important bitcoins is there any way to track a coin rather than a series of transactions? If I wanted one of the bitcoins from the infamous "Bitcoin pizza" ...
28
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2answers
7k views

Is there some way to merge two wallets or to import/export addresses?

I've got one wallet.dat from my laptop and another on my desktop, each containing various (different) receiving addresses that I use pretty often. I'd like to merge them into a single wallet.dat so I ...
22
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2answers
2k views

What percentage of Bitcoin transactions never complete?

Occasionally transactions will be broadcast to the network that will show in a 0/unconfirmed status in the Bitcoin client. It is also the case that from time to time for various reasons those ...
6
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2answers
259 views

Is the authentication system of the Bitcoin <-> SMS service PHONECO.IN adequate?

@osmosis made me aware of PHONECO.IN, which makes it possible to send Bitcoins via SMS. My question is whether their authentication system is adequate. From their website: PhoneCo.in is designed to ...
20
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6answers
2k views

How can I send Bitcoins via SMS?

I am considering working on giving Africans access to trade using Bitcoins. In many ways, parts of Africa is more developed when it comes to mobile payments than the west. The success of M-PESA ...
12
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4answers
3k views

How do I safely accept bitcoins without waiting for confirmations?

Are there any arbitrators that would guarantee the bitcoin transaction such that no one has to wait ten minutes to confirm the transfer of the said bitcoins?