Transactions are signed messages regarding the transfer or generation of bitcoins. They are broadcasted through the network and, if accepted, integrated in the blockchain.
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Why is my transaction not getting confirmed and what can I do about it?
I sent around 12 BTC from my Blockchain.info wallet to my LocalBitcoins account. They are showing at LocalBitcoins as an unconfirmed transaction. I have the fee setting at BlockChain.info set at the ...
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1answer
141 views
Can the transaction log history size scale?
Four Reasons You Shouldn't Buy Bitcoins, Forbes.com:
Scaling. The Bitcoin protocol requires that every node in the network
download a copy of every Bitcoin transaction that has ever occurred.
...
2
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0answers
141 views
Best (current) method to buy BTC in the UK?
I'm in the UK and am desperately trying to get onto this Bitcoin bandwagon before the whole thing collapses, but it seems like there are no decent ways to buy from the UK. There is an international ...
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3answers
145 views
Would it be possible to make a functional Bitcoin fork that confirmed a block of transactions every millisecond?
How fast could you possibly run a blockchain like bitcoins'? Could blocks be added as fast as a microsecond while still having a functional currency?
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2answers
184 views
Why are there two transaction outputs when sending to one address?
I did a small transaction some days ago:
https://blockchain.info/tx/4c07a07dfd9d5b79d168ec6835df876c64e82350a8f9211bf586d858a5aeb9ba
Some info:
1JFWE8THcAQQRYx99c43DXSGyoPL9Zs62D is my wallet
...
3
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2answers
108 views
Do Bitcoins still need users to trust each other to feel confident?
So we know that bitcoin is secure up to the point of basically proving P=NP. (Its an open question)
So bitcoin is secure. But I feel it still suffers one problem, as with all transactions(not just ...
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1answer
75 views
Is there any party who is archiving all transactions that have been broadcast?
There is a person claiming that Blockchain.info/wallet sent a transaction but for whatever reason that transaction never got included in a block.
If the transaction is valid today but perhaps just ...
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1answer
43 views
What is a previous transaction?
I'm new in the bitcoin field and I need to understand about transactions.
When Bob is sending bitcoins to Alice, Bob will create a tx, he will add Alice's address, sign it and broadcast it in the ...
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3answers
138 views
Which is the relation between transactions and blocks?
I don't quite understand the relation between a transaction and a block.
I imagine it as a list of blocks, and each block having a list of transactions but I have some doubts.
When I do a ...
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0answers
70 views
Can an attacker make it impossible to reclaim disk space
As I understand it, without implementing disk-space-reclamation as laid out in Satoshi's paper the system will not scale because the blockchain contains a history of every transaction. Bitcoin has ...
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1answer
162 views
Bitcoin wallet/address balance confusion
I'm quite new to bitcoins so apologies if i'm being a noob, but I'm very confused!
My bitcoin-qt wallet balance says I have 2.0113406 BTC (which is what I expect).
Now if you check my transaction ...
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2answers
86 views
Transferring bitcoins from my blockchain addresses to an exchange?
What are the specific steps, in order, required to transfer my bitcoins from their blockchain wallets to a bitcoin exchange? Please be specific. Thanks
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2answers
422 views
My mate received and then sent a Bitcoin transaction before his wallet was synchronised and it worked perfectly
His Bitcoin wallet was only 1% synchronized with the network and yet he was able to receive and send bitcoins without any problems?!
What are the implications / ramifications of this?
What does this ...
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0answers
149 views
Differences and similarities between Paymium, Mt.Gox,BitInstant and other major players, cryptocoins ?
I start exploring the Bitcoin world and I get confused concerning :
who does what,
different cryptocoins available,
Any specific advantage to use one ? for example, no limit for transfer, low ...
-1
votes
1answer
355 views
How do I get bitcoins in the first place? [duplicate]
I have no bitcoins at all. But how do I get them? Can I deposit money through my credit card and convert them to bitcoin currency or something?
Also, say I have 10 BTC. Can I acquire that in physical ...
0
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1answer
220 views
Synchronising with network
I'm completely new to Bitcoin but finding it all very interesting so far! My Bitcoin-qt wallet has been synchronising for literally days now (2 days actually) but it is getting closer, on 91% now. My ...
0
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1answer
81 views
How OP_EQUALVERIFY works in a standard transaction?
3 weeks ago I began learning about Bitcoins, and now I'm analyzing how it works internally. My problem is that I can't understand what two public key hashes are compare to use de OP_EQUALVERIFY, ...
2
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1answer
128 views
Can a transfer be done over postal mail?
Suppose I'm stuck in the middle of nowhere with no internet access and I want to make a payment to a certain Bitcoin address.
Is it possible to do a transfer via postal mail, and if so what ...
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3answers
194 views
How can market-based transaction fees scale?
Can someone please explain to me what I am missing?
I don't see how variable, market-based transaction fees can scale. I go to a merchant's website to buy, how do I select a mining peer to pay ...
0
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1answer
206 views
What if Bitcoin gets to the point that all the coins have been mined?
What if Bitcoin gets to the point that all the coins have been mined? There will be lots of transactions and no one to process them. My question is who will do all the transaction processing when ...
-1
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1answer
55 views
What modification of the proof of work algorithm will speed up confirmations as the network hashrate increases? [duplicate]
From my observations of the BitCoin network, the increase in overall network hashrate does not seem to improve the network in any way other than to make an attack more difficult.
I was wondering ...
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0answers
31 views
Do Pools reduce the risk of money laundering via Tx fees?
With the recent FinCEN notice, one thing that wasn't explicitly described is how Pools need to operate w.r.t. the miners.
In this question, I only want to focus on the scenario where a large Tx fee ...
3
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2answers
135 views
Possible to create a double spend attack by replacing a Tx in the merkle tree?
This question on crypto.SE describes how preimage attacks are avoided in the Bitcoin network.
For a second preimage attack:
hash(x) = hash(y) implies hash(hash(x)) = hash(hash(y))
So it ...
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1answer
104 views
If addresses are hashes of public keys, how are signatures verified?
I've skimmed through the https://en.bitcoin.it/wiki/Protocol_specification and it seems that when sending someone bitcoins, I would sign the transaction data (not quite sure which parts exactly) with ...
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1answer
84 views
What are the requirements of a transaction being included in a block?
What are the requirements of a transaction being included in a block? How does a miner verify that a transaction meets such requirements?
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0answers
42 views
How to get hex string from transaction in bitcoinj
I want to use this tool: http://blockchain.info/pushtx to push transaction. I don't understand the input data. It says it is hex string representation. I've read information about that in the raw ...
2
votes
1answer
433 views
Where is it possible to buy an ASIC?
I know of Avalon and Butterfly Labs, but they aren't currently shipping. Does anyone know where, if anywhere it is possible to order and receive shipment before the year's out?
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1answer
78 views
Mediated transfer of funds between three parties
Alice wants Bob to transfer 10btc to Carol, and is willing to pay Bob 11btc for the transfer.
They both entrust Trent to mediate the transaction, and Alice is willing to pay Trent 1btc as commission.
...
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1answer
136 views
How do I reverse a transaction?
Ok here is the thing I lost coins on this computer trying to send them to my laptop this is what it said
Status: 0/unconfirmed
Date: 2/6/2013 14:53
To: 1PrM4QW3UtkGhi1uXFjvtDhn3h3x3pMipn
Debit: -3.98
...
2
votes
2answers
179 views
What are the limits of the bitcoin protocol for making thousands of transactions, and what are the alternatives?
What are the limits of the bitcoin protocol for microtransactions, and what are the alternatives?
I am contemplating an application that would require each user to spend fractions of bitcoins ...
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1answer
245 views
What Currency should I use to buy bitcoins? EUR, USD or other? [closed]
If I want to buy through an exchange I should better go to the one who has highest volume. The better the volume the more liquidity it has. What if I buy bitcoins using India's or China's currency and ...
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2answers
105 views
Is it possible to transmit a tx over the network that does not go into the blockchain?
Can I somehow create a transaction that is broadcasted over the bitcoin network but will not go into a block?
Might be handy for SatoshiDice like confirmations.
edit:
What I have in mind is ...
7
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0answers
171 views
Are there any pools or large miners running “child pays for parent” patch?
A feature available through pull #1647 gives the recipient of a transaction a method to help get a transaction to confirm.
This feature is called "child pays for parent", and what it means is that ...
3
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3answers
279 views
How many confirmations do I need to ensure a transaction is successful? [duplicate]
As a regular user of Bitcoin, I often send bitcoins to other, or receive BTC from others, sometimes this might be a trade or deposit. Some traders require at least 6 confirmation, some require at ...
5
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2answers
156 views
How can I cancel and replace a Transaction that never gets confirmed?
According this this WikiPage, a MultiSigTransaction that doesn't include a fee may never get included in a block.
Since I've read that replacing Transactions (by version number or any other feature) ...
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1answer
339 views
What files do I need for backing up my wallet? [duplicate]
Is %APPDATA%\Roaming\Bitcoin\wallet.dat the only file I need to backup my wallet?
I've heard about backing up every ~50-100 transactions is this correct? I thought that with the wallet.dat file, I ...
2
votes
1answer
127 views
Is Kim Dotcom's “Megacard” a viable possibility for bitcoin?
A week ago Kim Dotcom posted that a Bitcoin Credit Card would be something that he would be keen to support. Apart from Bitcurex, which is a different system and slightly lacking in credability and ...
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1answer
70 views
How do I view the “change” addresses in my wallet? listreceivedbyaddress 0 true doesn't work
I just sent a test account 5 BTC. I see in the output 1.38BTC was "change" and needs to be sent back to my wallet.
Where can I find the contents of 1F39Qj4E3HnbnyYgan5CZa37spGfHro8eK, and was ...
3
votes
1answer
210 views
Have there been case studies of how anonymous bitcoins are?
The blockchain has a lot of information about all bitcoin transactions.
I've heard a lot of conjecture about how anonymous bitcoins transactions are, but I haven't seen a scientific study.
Are there ...
2
votes
1answer
312 views
What is relation between scriptSig and scriptPubKey?
Scenario: A is sending 1 BTC to B.
scriptSig appears in the Input Script.
scriptSig = <sig> <pubKey>
Here, public key is the Public Key of the sender, A. (this is the public key ...
1
vote
1answer
126 views
How is hash160 calculated from an unseen public key?
i was looking thru Block explorer at an address with a balance. it has never been spent from thus the public key is unknown. if the public key is unknown, how can Block explorer calculate the ...
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votes
1answer
68 views
Fee height vs. TX value - limit?
Is there a particular reason fees higher than the transaction volume are allowed?
What about imposing this:
Smallest output must be at least 10 times the fee.
Might reduce Spamdice transactions ...
0
votes
2answers
64 views
Why hardfork is not preferred?
My idea of hardfork was, anything that requires building blockchain again from genesis block. But now, I understand anything that requires bitcoin-qt client upgrade is hardfork too. Why hardfork is ...
5
votes
1answer
104 views
How should I get all transaction history in a format that I can analyze?
I want to download the entire bitcoin transaction history and store it in a database at my end to perform certain analysis. How do I get from the blk*.dat files to a useful format?
3
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2answers
162 views
Does the satoshi client always send the change of a transaction to a newely generated address?
Experimentally, this seems to be the case, but is it always like this or depends on some details?
Also, does it generate a new address each time this is done, or first searches the wallet if there is ...
2
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0answers
55 views
What example Bitcoin block has a Namecoin hash in it?
I'm looking for an example Bitcoin Block that would have a Namecoin merged-mined Tx in it.
Can anyone direct me to a block that has such a hash?
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2answers
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What are QR codes and How do you use them as request payment from Wallet?
What are QR codes ?
How do you use the QR code for payment function on the wallet ?
When would you use it ?
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1answer
229 views
how to sign a transaction using only offline computer?
I think it is possible to generate keys in a offline computer and sign. To create a transaction I need input transactions detail, and somehow I have to transfer signed transaction from offline ...
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3answers
37 views
Where can I get email notifications on any transactions to/from an address I do not control?
There was at least one site that did this I remember.
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Bitcoin Transaction Scripts
Could someone explain to me how the bitcoin transaction scripts work?How to build custom scripts?
Also please explain the data structure of transactions as specified by the bitcoin protocol? How to ...
