Confirmations are blocks that are dependent on a given transaction. This includes the block containing that transaction and all blocks after it in the hash chain. The more confirmations a transaction has, the more likely that it will remain in the chain permanently.

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What happens if a TX was a double spend?

What happens if the 'High' risk option (one confirmation) was chosen and then the TX turns out to be a double spend in the end? Would the value deposited be revoked? Would the user be notified ...
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1answer
22 views

What is min time to get first confirmation for transaction?

How much time does it take to get first confirmation for transaction? I don't need the exact number of minutes, just some useful approximation. I found this chart of average confirmation times, but ...
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41 views

Lower confirmation time schemes: any requirement between confirmation time and the probability to find a block during that confirmation time?

Bitcoin, the first blockchain-based cryptocurrency, set a 10 minute confirmation interval time; LiteCoin set a 2 minute confirmation interval time; DogeCoin set it at 1 minute; QuarkCoin set it at 30 ...
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1answer
54 views

Time to send bitcoins?

I was investing bitcoins in Coin Controller but I need the time to send it because they only give you 10 minutes. So I want to know how to calculate the time to send bitcoin with for an example ...
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1answer
351 views

When to worry about 1-confirmation payments

A customer sends me a payment for some digital good at my service, where delayed delivery is a deal-breaker, so I only wait for 1 confirmation by the network before releasing the links for the ...
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1answer
37 views

Do Miners get a reward for re-confirming blocks?

As far as I know, to ensure double-spending didn't happened and also for other security reasons, there is minimum number of confirmations that a transaction should have to be accepted. That value is ...
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2answers
87 views

Why wait for several confirmations before shipping?

Suppose customers pay me bitcoins for their purchases. As far as I understand, I could check block chain that the proper payment amount has been made to the address I generate for each customer, and ...
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0answers
13 views

0 confirmations after several hours [duplicate]

I sent off a bitcoins from the bitcon-qt client to fund another bitcoin wallet and it has been seveal hours and there are still 0 confirmations what can I do about it? I have a mac and I am at a loss ...
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1answer
34 views

Significance of average block generation rate

I am stuck in this thought for a while regarding the block generation rate. My concern is, when a payer waits for 10 minutes to confirm that her transaction is included in a block, it suggests that a ...
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1answer
157 views

How long does it take for a transaction with 0 fees to be confirmed or rejected?

I have a problem with a transaction that has 0 btc fees: https://blockchain.info/tx/256301465d77affb6bc7087432a9130db48dd64efa28b0460fb674eda704f382 From what I understand, eventually this ...
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2answers
69 views

Accelerated block generation

According to http://btc.blockr.io/ : Height Block created Transactions Block fee Size (kb) Days destroyed 318525 2 minutes ago 28 0.00370000 8.36 kB 2.00 318524 3 ...
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1answer
66 views

Confirmation limit

When seeing transactions I see that the number of confirmations keeps increasing without any limit. I wanted to know if there is any time limit on including a already confirmed transaction in a block ...
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2answers
89 views

What does it mean to have -1 confirmations?

I have -1 confirmations for an inbound transaction on my Electrum wallet. What does is it mean to have -1 confirmations?
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0answers
28 views

How does Core distinguish between confirmed & unconfirmed Tx in memory?

Looking for a low-level answer, links to reference code would be helpful: Is there a difference between a Tx message received from a peer, and a Tx item as included in a valid block received from a ...
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1answer
25 views

How can bitcoin be used for all transactions, even with only one confirmation? [duplicate]

If bitcoin is ever going to be mainstream, how can we get around the problem of confirmation time? I don't think I like the idea of having to wait an hour for my transaction to be confirmed so I can ...
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1answer
139 views

How long should confirmation (spendable amount) take?

My transaction already has 24 confirmations at blockchain.info, and the transaction is correctly recorded in Multibit. But there is no "spendable amount". I've already "Reset Blockchain And ...
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1answer
300 views

How long would it take for a transaction with 0 fees to be confirmed six times?

I thought my wallet would ask me for a tx fee, as it always does, it just sent the amount without any tx fee at all. Now it seems to be stuck in some sort of bitcoin limbo. It's been two hours now, ...
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2answers
87 views

How do we check the time when a transaction hits x confirmations?

Consider the transaction 948a427.. which has 3341 confirmations as of now: We can see that the time the relay is received at 8:36:30 and it has one confirmation at 08:50:04 (after 14 minutes). How ...
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1answer
48 views

Altcoins: Determine how many confirmations to require to deposit

For Bitcoin it is common knowledge that 6 confirmations suffices. For the hundred of Alt Coins however, I'm not sure what the best practise to be protected enough from double-spents and the likes is. ...
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1answer
109 views

Creating An Altcoin: How to Lower or Increase Confirmation Times?

When Creating an Altcoin for fun, what variable/attribute do I change in main.cpp file to increase/lower the time it takes for confirmations to take place? Also can the confirmation times be changed ...
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1answer
212 views

listsinceblock parameter: target-confirmations

listsinceblock help returns: listsinceblock ( "blockhash" target-confirmations ) Get all transactions in blocks since block [blockhash], or all transactions if omitted Arguments: 1. "blockhash" ...
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1answer
55 views

What are the economics of confirming a block of transactions?

From what I understand, CREATING a block to confirm or verify transactions is hard work, and is rewarded with 25 bitcoins, or something like $12,325 (depending on the daily exchange rate). But how do ...
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2answers
431 views

How to minimize risk when accepting zero confirmation payments?

I'm trying to setup a way of accepting Bitcoin payments in real life situations, where waiting for confirmations is typically not an option. I understand this is never 100% risk free (especially with ...
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1answer
462 views

How does BitCoin prevent fraud during confirmation period?

I'm trying my best to understand how bitcoin works and while I've grasped the basics, there's a lingering question: What's to stop me from spending my bitcoin multiple times during a confirmation ...
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3answers
1k views

If you confirm others' transactions, what do you do to earn 25 bitcoins per block?

I was a bit surprised to learn that you can earn 25 bitcoins, just by confirming a block worth of transactions. If I've done the math right, at $493 per bitcoin, that's $12,325. Does one do a lot of ...
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1answer
94 views

Is there a way of rewarding users who confirm others' transactions?

Users who confirm or validate others' transactions are performing a public service on the Bitcoin network. Is there any way to reward such users, perhaps by giving them priority for confirmation of ...
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1answer
273 views

Fastest cryptocurrency

What cryptocurrency is the fastest in terms of reaching 100% transaction confirmation? I've found sites like this that show that Fastcoin is the fastest at 48 seconds. I think David Schwartz said ...
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2answers
68 views

Who would accept confirmations of invalid transactions in a 51% attack?

My understanding is that honest nodes work on the longest valid block chain. Suppose a dishonest node confirms an invalid transaction. If that node manages to continue producing confirmations at a ...
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0answers
13 views

Not getting confirmation [duplicate]

I had my original wallet on a Windows 7 machine and had it backed up to a USB stick. My Motherboard bit the dust a week ago so I downloaded the bitcoin wallet-qt to my Mac Book Pro and waited for the ...
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0answers
161 views

Spending own generated unconfirmed change in the v.0.9.0 era

Reading about spending own generated unconfirmed change some time ago I stumbled upon this reddit thread that convinced me that doing so is a really bad idea and could prove catastrophic for any ...
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1answer
100 views

How to get confirmations for incoming transactions?

I'm currently working on accepting Bitcoins on my website. To do this I create a new address for every sale. I know I can get the amount of bitcoins that were paid into this address by using ./btcoind ...
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120 views

How big is the chance of double spending for 0, 1, 2, 3, 4, 5 and 6 confirmations?

I'm messing around with bitcoins a bit, and I'm now looking at the confirmations. In several places I read that 6 is the "normal" figure of confirmations needed to say a transactions has actually and ...
2
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0answers
128 views

Bitcoind -walletnotify more than 6 confirmations?

I've configured bitcoind -walletnotify to run php script when callback is triggered. It works fine, but only notify until 3 confirmations are received. My goal is to notify when 6 confirmations are ...
4
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1answer
116 views

Does anyone have insight into how Coinbase calculates the number of confirmations for a transaction?

When you compare number of confirmations for a transaction by hash using Coinbase vs using Blockchain.info, Coinbase is always ~10 confirmations below Blockchain. Does anyone know why? I'm using the ...
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4answers
144 views

How much money is a double spend worth?

I keep hearing people say that 0 confirmations are safe at small dollar amounts because it would take more money to do a double spend hack. At what value does it start to become unsafe to trust a 0 ...
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3answers
335 views

Are Bitcoin transactions really “frictionless” given confirmation time?

One of the big selling points for Bitcoin is that transactions are frictionless. I understand this to mean that there is no middleman to take a cut. However, there are 2 major frictions I see. 1) ...
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2answers
268 views

Altcoin confirmations and safety - wait ~6 confirmations, or ~1 hour?

The general consensus in the Bitcoin network is to wait for 6 confirmations or 1 hour on a transaction before it can be considered completely irreversible. However, when it comes to altcoins that use ...
3
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2answers
815 views

What happens if your transaction is never confirmed?

If I have a low amount and don't include it fee it takes forever to get confirmed. What happens if it never gets confirmed? Can the wallet that I sent it to still spend it?
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2answers
75 views

Can long time taken for confirmations become blocker for bitcoin adopotion? [duplicate]

As of today, it is observed that up to 6 confirmations are needed in most of the places to verify that the transaction is complete. Assuming that it takes 10 mins for one confirmation, it takes up to ...
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1answer
94 views

How to get last transactions made to a non-wallet bitcoin address?

I know I can rebuild my block index by setting txindex=1 in my bitcoin.conf file and restart bitcoind with -reindex so that I can view non-wallet transactions using: bitcoind getrawtransaction ...
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1answer
82 views

How to determine if a BTC payment has been done

Scenario: You have a website running on a remote server, and you want to accept BTC donations to a specific address (most likely yours) and to display a "Thank you" message automatically. How do you ...
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2answers
179 views

Block confirmation speed

Based upon any standard you think relevant, how quickly are current blocks being verified for rule-following such as correct balance tallies, true transactions, correct rewards & fees? Is this an ...
2
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1answer
122 views

How to accept BTC payments

I'm developing a website that will be accepting BTC as a form of payment. I (technically) know how to accept payments, I'm currently experimenting with the daemon and the Python-BitcoinRPC library ...
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2answers
235 views

Transaction confirmation

How does transaction confirmation work in bitcoin-qt? I suppose, client does not have addresses index with balance on each of them (because there is not such console/bitcoind commands). Looking ...
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1answer
49 views

Can a transaction be in two blocks?

What happens with a valid block which contains a transaction which was already included in previous blocks? Is such a block accepted by other nodes in the network or discarded?
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1answer
774 views

Quarkcoin's bitcoin-qt fork won't recognise unspent transaction

I've got a problem with my bitcoin wallet client, I got around 10 QRK by mining via a pool, transferred them to my local wallet and then sent them to btc-e, I got a dialogue box saying something about ...
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1answer
404 views

Transaction remains not confirmed

On Multibit, one of my transaction to Bitstamp is not confirmed since 5 days (Status icon displays a white square). Apparently the 0.0001 fee was paid. I don’t know where is the money neither what to ...
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0answers
40 views

Bitcoin client confirmation configuration

How do I setup Bitcoin client (bitcoin-qt, bitcoind) to wait only for 1 confirmation? Is this setting hard coded into the client? This setting would be useful for merchant to accept payments as soon ...
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2answers
306 views

Is it possible to run a miner to confirm transactions for a target address?

If I want to make a bitcoin transaction I need to wait 3-6 confirmations for my transaction to be accepted (by say an exchange etc) Is it possible to run a miner so that it is listening out for ...
2
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1answer
1k views

Bitcoin transaction with 0.0001 BTC fee not getting confirmed?

I sent the following transaction a few hours ago with Bitcoin-QT: https://blockchain.info/tx/b5682b48484a8752be62c6b4036eaf8a8f005d9ea75cbff434476b7506a9e3a2 And the transaction still has not been ...