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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How The Ideal Reserve “branch reconciliation” “in less than 400 ms”?

Here says After having launched bootstrap Clearinghouses on all major continents, they are fully reconciling transfers in less than 400 ms with competition and 200 ms without. "Reconciliation" ...
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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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29 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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93 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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64 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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61 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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69 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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25 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
24 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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88 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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123 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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81 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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42 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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89 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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157 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
54 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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320 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
434 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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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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93 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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196 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
62 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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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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133 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
86 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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104 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 ...
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123 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 ...
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103 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
140 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
314 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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249 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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707 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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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
89 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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80 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
166 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 ...
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1answer
119 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
230 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
763 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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393 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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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
303 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 ...
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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 ...
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1answer
215 views

Confirm a specific transaction

I sent a Bitcoin transaction a few days ago and it still doesn't have any confirmations. I actually have a ASIC miner. Is it possible to confirm a specific transaction, in this case mine, with my ...
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1answer
419 views

A transaction that does not get processed

Yesterday I moved 20 bitcoins from my wallet in MtGox to my personal wallet, twice. The two transactions were made in a short time (about 1 minute). Both were done toward the same recipient: ...
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166 views

Fee Paid vs Confirmation Time

I there a graph correlating fee size and confirmation time? A graph where I can see the fee paid by transactions which got confirmed in less than 20 minutes. Is there a graph like that?
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1answer
2k views

How does confirmation exactly work?

When user A sends Bitcoins to user B, user A signs the transaction with his private key. This signed transaction is being sent to the Bitcoin network and all the nodes collect, confirm and pack these ...
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2answers
437 views

No confirmations, waited for months!

I sent a payment of 0.9995 bitcoins back in April to my MtGox account. However I just checked and it has 0 confirmations. Additionally it doesn't show in my wallet or my MtGox account. Is it lost? Can ...
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1answer
258 views

Transaction verification

I run a 0-confirmation tool. To track new transactions I use: bitcoind getrawmempool new transactions in new block not available in mempool (it seems I do not receive all transactions in mempool ...