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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Why hasn't my bitcoin transaction gone through?

So about 3hrs from now I made a transaction to a different wallet of mine and the money didnt come through in 20mins I checked the blockchain and the number of confirmations kept rising and its up to ...
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20 views

What still needs to be improved with Bitcoin?

What issues or loopholes need to be improved upon in Bitcoin? I'm curious to find out, as I've seen people throw around the idea of instant confirmations, increased anonymity, etc..
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71 views

How many confirmation do i have to wait before i can spend the inputs I already received?

Can I spend Inputs with 0 confirmations?? If I could, are there some restrictions?
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2answers
77 views

Transaction marked as “Newly generated coins” on Blockchain.info

On blockchain.info I saw a transaction labeled as "No inputs (newly generated coins)". Are these new coins generated from mining? How come that such a transaction can have 30 confirmations, while ...
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258 views

Why are there so many confirmations?

A friend sent me Bitcoin to my blockchain wallet. It shows the amount as part of my balance. However, it says there are 108 confirmations and the number of confirmations keeps going up. Why is this ...
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1answer
52 views

Can one set how many confirmations MultiBit requires for a transaction to be accepted?

Is there any way for users to specify the number of confirmations for a transaction? If not, how many confirmations does Multibit require to complete a transaction? And does the required default ...
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25 views

Why Bitcoin's 10 minutes? [duplicate]

Are established by the initial Nakamoto protocol and now mantained by the developers through the control on the difficulty? Are difficulty and technological progress strictly related?
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1answer
59 views

Bitcoind doesn't add miner fee

How do I make sure bitcoind's RPC call sendtoaddress adds miner fees to transactions? Tried adding to our bitcoin.conf file: mintxfee=0.0001 But some of the transactions still won't get any miner ...
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1answer
45 views

Energy to confirm one block?

What is the minimum energy (or CPU operations) required for someone to confirm one block on their own, to launch a double-spend attack? How can I calculate this from the current difficulty or ...
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3answers
62 views

Do I need N confirmations if I'm only worried about the transfer getting invalidated by a different block?

Say I ask Bob a lot of bitcoins in exchange for an expensive product. Bob sends it to me and I wait 1 confirmation to send him the product, because I trust Bob. I am only worried about the transaction ...
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0answers
159 views

Transaction with 12+ confirmations at blockchain.info, but still no coins have arrived

So i'm using Blockchain.info as a wallet, i received some bitcoins to my wallet and inmediately after that i re-sent them to an exchange. Incoming to my wallet: ...
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1answer
162 views

Bitcoin-Qt wallet shows outgoing transaction as “Offline (0 confirmations)”

What is the meaning of a transaction status of "Offline (0 confirmations)" as opposed to "Unconfirmed (0 confirmations)" ? Does it mean that the transaction has not even been sent to the network yet? ...
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2answers
83 views

Are there any stochastically dependent proof of work algorithms?

In bitcoin, the probability of discovering a block on the X-th hash is the same1 as it is on the Y-th hash. As such, the probability of discovery is stochastically independent. Are there proof of ...
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2answers
283 views

How does ShapeShift operate on 0-1 confirmations

ShapeShift can exchange user's crypto currency almost instantly. They state that most transactions don't require any confirmations: Small deposits are processed with zero confirmations. Larger ...
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3answers
97 views

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
108 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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1answer
98 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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82 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
547 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
105 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
118 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
14 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
46 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
1k 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
79 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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83 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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156 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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33 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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283 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
811 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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129 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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71 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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167 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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391 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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58 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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808 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
562 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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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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114 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
551 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
82 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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230 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
142 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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149 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 ...
3
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1answer
209 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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148 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
158 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 ...
3
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3answers
369 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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307 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 ...
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2k 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?