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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17 votes
5 answers
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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 ...
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9 votes
1 answer
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?
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7 votes
1 answer
404 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 '...
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11 votes
2 answers
640 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? ...
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26 votes
3 answers
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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?
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-1 votes
1 answer
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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 ...
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12 votes
1 answer
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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?
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14 votes
6 answers
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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?
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9 votes
2 answers
481 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).
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45 votes
2 answers
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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 ...
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5 votes
1 answer
734 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 ...
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  • 153
14 votes
3 answers
2k 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 ...
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11 votes
2 answers
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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 ...
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12 votes
1 answer
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How do Bitcoin clients determine the number of confirmations a transaction has?

The protocol specification doesn't seem to address this.
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6 votes
4 answers
798 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 ...
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5 votes
2 answers
426 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 ...
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3 votes
4 answers
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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 ...
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9 votes
1 answer
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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: ...
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25 votes
2 answers
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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 ...
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3 votes
4 answers
438 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 ...
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5 votes
1 answer
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 ...
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  • 937
19 votes
3 answers
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 ...
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51 votes
3 answers
12k 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 ...
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21 votes
1 answer
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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 ...
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29 votes
5 answers
6k 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 ...
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17 votes
3 answers
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 ...
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7 votes
1 answer
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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 ...
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  • 849
25 votes
2 answers
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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 ...
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  • 849
15 votes
3 answers
1k 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 ...
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19 votes
1 answer
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, ...
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  • 5,297
49 votes
7 answers
12k 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" ...
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  • 14.3k
28 votes
2 answers
9k 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 ...
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  • 14.3k
22 votes
2 answers
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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 ...
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  • 14.3k
6 votes
2 answers
266 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 ...
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20 votes
6 answers
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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 ...
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  • 3,434
13 votes
5 answers
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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?
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40 votes
5 answers
2k views

How do I accept bitcoin payments at a real world store?

From what I understand, there are some requirements for using bitcoins at a physical store: Both the store owner and the client must have Internet access The client must have a cellphone or a laptop ...
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  • 11.4k
10 votes
4 answers
399 views

Are there any feasible methods of maliciously reversing transactions?

How can transactions be maliciously reversed? What resources are required?
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10 votes
2 answers
501 views

Decentralized transactions between two decentralized currencies

Currently, bitcoins and namecoins are implemented using the Bitcoin protocol. And there might be several reason for new block chains to appear, but this is not the subject here. As far as I know, ...
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14 votes
3 answers
1k views

Eligius pool and 'generated' bitcoins

I mine at Eligius pool and sometimes a new transaction appears in my bitcoin client labeled 'Generated'. Why does this happen? Do I also get these 'Generated' bitcoins if I use an e-wallet's address ...
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  • 11.4k
42 votes
7 answers
38k views

What happens if I mistype the address when making a payment?

I sent bitcoins to an address, but I think I made a typo when I copied it. Where did these bitcoins go. Can I get them back?
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  • 5,372
45 votes
4 answers
76k views

How do I see the IP address of a bitcoin transaction?

How do I see the IP address that someone used to send or receive bitcoins with? Is it stored in the blockchain?
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  • 5,372
9 votes
2 answers
1k views

Is there an easy way to search all the transactions?

Is than an easy way to search the list of all bitcoin transactions? For example to find all the bitcoins sent to or from an address?
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  • 5,372
23 votes
9 answers
3k views

Can I send bitcoins with my mobile phone?

Is it possible to send and receive bitcoins with a mobile phone? If so, are there bitcoin clients for Android or iOS?
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  • 5,372
7 votes
1 answer
329 views

How did transaction fees work in the version 0.3.24?

Is there a minimum transaction fee for every transaction? When do I pay a fee over the minimal fee?
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  • 26.3k
58 votes
2 answers
45k views

What are bitcoin "confirmations"?

When I receive bitcoins I see a certain number of "confirmations" in the client. What do these mean? Why do most sites make me wait for 6 "confirmations" before a purchase will go through?
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  • 5,372
79 votes
6 answers
19k views

How can I accept bitcoins on my website?

I have an online store and would like to begin accepting bitcoins. How can I go about doing this?
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  • 14.4k
37 votes
10 answers
29k views

How is it possible to launder bitcoins?

Some services, such as bitcoinlaundry.com, claim that they can launder your bitcoins. Since all bitcoin transactions are publicly logged, how is this done? Wouldn't it be possible to trace back the ...
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  • 11.4k
64 votes
9 answers
35k views

How anonymous are Bitcoin transactions?

I read some sources that say Bitcoin transactions are anonymous, some that say they are semi-anonymous, and some that say they are not anonymous at all. In what ways are the transactions anonymous ...
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23 votes
3 answers
3k views

What happens when someone sends bitcoin to my wallet?

I didn't get it. Should my wallet be online? What if it becomes corrupted before I make a backup? Can I use my backup wallet that was backed up few days ago?
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