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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6
votes
1answer
662 views

Is it possible to recognize conflicting 0-confirmation transactions with the Bitcoin client or other available software?

Is there already a way to detect conflicting 0-confirmation transactions? I'm assuming at least one transaction goes to my wallet. I would expect the client to list the transaction as conflicting but ...
2
votes
1answer
767 views

Identifying sender

Is the sender's address the only way to identify the seller? I don't see how this would work for a large websites that accept bitcoins. Since all of the transactions are visible, anyone can claim ...
7
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3answers
216 views

Given a Tx message, how does one calculate the fee paid for the transaction?

Given a Tx message, how does one calculate how big a fee one paid for the transaction?
8
votes
1answer
191 views

Is there a limit on the number of orphan transactions a node can cache?

I´m asking this because a possible attack would be to send an flooding number of orphan transactions, which will never be redeemed. Then clients would have to cache them, increasing storage ...
12
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2answers
2k views

Two blocks, two transactions, same hash

Would a block containing a transaction with an identical hash as a previous transaction be considered valid? That is, if someone made a transaction for generating Bitcoins and solve two blocks with ...
6
votes
1answer
2k views

How to broadcast a transaction anonymously

Is it possible to broadcast a transaction to the network without revealing my personal IP address? My first guess is to connect bitcoind over Tor with proxy=127.0.0.1:9050. Is it the good way to do it ...
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 ...
3
votes
1answer
225 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 ...
6
votes
4answers
1k 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 ...
42
votes
1answer
12k views

How are transaction hashes calculated?

I'm trying to calculate the hash of transactions in bitcoin blocks, but I'm not getting the right answers. For example, the genesis block has a single transaction. Here's how I'm attempting to ...
4
votes
1answer
227 views

Can one send bitcoind transactions that will only be valid after a certain amount of time?

The standard client only allows one to spend coins from a transaction after getting 6 confirmations (120 in case of mining rewards). Can one send bitcoind a JSON-RPC command telling it to send those ...
3
votes
1answer
616 views

Creating a custom transaction?

I am trying to create a custom transaction. I am using c# and I will code the signature code myself since no library currently allows this. The transaction involves 3 players; a buyer, a seller and an ...
2
votes
1answer
124 views

How do pools get the needed transaction information?

How do the mining pools obtain the transaction information required to create a new block? Do they communicate with the network directly, or perhaps through a Bitcoin client, like bitcoind?
2
votes
2answers
157 views

Will BTC value depend on their history?

It might seem that virgin coins will have higher value than older coins that have lot of exchange transactions that might make it more traceable. Is there some prevision in the protocol for this ...
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 ...
2
votes
1answer
350 views

Sent 95BTC to my client from Mt.Gox and it never showed

I have had Bitcoin for some time now, but am relatively inexperienced. I have a Mac client, and yesterday sent 95BTC to it from my Mt.Gox wallet but it never arrived. I sent Mt.Gox a message asking ...
4
votes
1answer
233 views

Lightweight client, bare necessities

What are the bare data necessities that a lightweight client would have to get from a server client in order to perform basic wallet tasks (show balance, transaction history, number of confirmations, ...
4
votes
1answer
162 views

How does the network determine whether to replace a transaction?

Further to this question, how does the network determine whether to accept a new version of a transaction as a replacement transaction? Could an attacker replace transactions maliciously?
7
votes
1answer
4k views

Bitcoin script example

Is there some good example on how to process a basic tx's scriptsig and get the recipient's address from the raw transaction?
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, ...
5
votes
1answer
223 views

No Account number or Address in listtransactions for generated blocks

I am in the need (for my app development) of having more information printed with the "listtransactions" of the bitcoind daemon. For blocks generated it shows the account as "" and no bitcoin address ...
3
votes
2answers
219 views

What would be the process for identifying a person that performed a transaction from a wallet on a personal device?

I presume the legal process would be something along the lines of Get IP address from blockchain. Get ISP to tell you whose that is or was at the time. So I expect that this would normally require ...
28
votes
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 ...
8
votes
1answer
1k views

Where can I see the average transaction fee payed in the last 100 blocks?

Is there a site that shows what's the average transaction fee payed in the last X blocks? Or just raw data about this? I checked BlockExplorer and Sytes and they don't seem to show this information.
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 ...
7
votes
4answers
240 views

Do no-fee transaction represent a greater risk if the product is delivered instantly?

Let's say I want to accept payments instantly on a site for digital downloads. So I publish an address and wait for the unconfirmed transaction, I see the transaction and release the digital download....
6
votes
1answer
465 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
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. ...
6
votes
1answer
3k 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 ...
7
votes
1answer
696 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&...
10
votes
2answers
656 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 ...
17
votes
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 ...
7
votes
1answer
319 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?
9
votes
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?
11
votes
2answers
595 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? ...
9
votes
2answers
364 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).
5
votes
1answer
607 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 ...
5
votes
2answers
409 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 ...
12
votes
1answer
1k views

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

The protocol specification doesn't seem to address this.
3
votes
4answers
431 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 ...
19
votes
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 ...
10
votes
2answers
475 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, ...
21
votes
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 ...
24
votes
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 ...
6
votes
2answers
261 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 ...
9
votes
2answers
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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