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Questions tagged [confirmations]

Confirmations correspond to the number of blocks that are dependent on a given transaction. This includes the block containing that transaction and all blocks after it in the blockchain. The more confirmations a transaction has, the more likely is it that it will remain in the blockchain permanently.

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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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What is the “confirmation” field in a block?

What is the importance of the "confirmation" field in a block? How many confirmations are required to accept a block in a blockchain?
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how long do i have to keep Bitcoin-Qt open after sending coins

Can I close Bitcoin-QT client and power off my computer just after sending coins to someone or do I need to wait until 1, 2...6 confirmations?
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508 views

Why can bitcoins never be refunded unless the receiver agrees to send back the money?

I have used a number of ecurrencies and they all seem to share what I've never understood about BTC, which is that once it is sent, it's gone. Often BTC are sent but legally should be refunded, but ...
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286 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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285 views

Why do first bitcoin transactions receive most confirmations?

My very first Bitcoin transaction has 740 confirmations, the next have 239, 212, 70, 43, 5, and 5, respectively. Is this just because my first transaction has had more time to get more confirmations, ...
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231 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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222 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 ...
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260 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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170 views

Using funds that have not been completely transferred yet for a new transaction

What happens if I start a new transaction with funds from a transaction which isn't 100% complete? Let's say, the incoming transaction shows 2/3 of the green dot, but the sum is counted as full by ...
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Bitcoin transaction with 0.0001 BTC fee not getting confirmed? [duplicate]

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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What is a transaction's step-by-step life cycle?

I'm trying to understand a transaction's lifetime and haven't yet found a technical, linear "timeline" of events that occur when a P2P transaction occurs. This is my understanding so far; please ...
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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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487 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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What is the longest time a transaction has been in limbo for?

What is the longest time a transaction has been in limbo for in Bitcoin?
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358 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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1answer
171 views

Is the current number of confirmations visible somewhere in the raw block?

Is the current number of confirmations visible somewhere in the raw block output created by blockexplorer or blockhain.info? Is this information available in the raw stream or is the number of ...
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114 views

Do transactions with old UTXOs take longer to confirm?

Suppose I do a transaction with an UXTO created years ago. Would that take longer to confirm because miners would have to look further back in the transaction chain to verify it?
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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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How does a wallet use unconfirmed outputs as inputs after unconfirmed transactions?

I have 10 btc on address A. Using raw transaction, I send 5btc from A to B and set the change address as A itself. Now because the transaction from A to B is not confirmed I can't spend the remaining ...
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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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450 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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721 views

What factors determine how long confirmation takes?

Simple question... What are all the factors (all of them!) that determine how much time X number of confirmations of a transaction takes?
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484 views

Verifying that a transaction is in the blockchain

Let me first start off by saying im just learning about blockchain and the technical aspects. From my understanding, each transaction is cryptographically hashed, the hashes are paired and hashed ...
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695 views

What does a negative “confirmations” value in listtransactions mean?

I sent a transaction on a small altcoin, and running listtransactions an hour later or so says -1 confirmations. It is forked from Bitcoin Core 0.8 and barely modified. What does this mean?
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Second, Third, Etc Confirmations taking a long time, why?

I have sent a bitcoin transaction of 0.18, you can see it here. https://live.blockcypher.com/btc/tx/22bacef7d4fb78e4e90cd04540daad257a39cb4ab4510f9e0efe5a88efaf0f87/ I included a fee of 0.002 even ...
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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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how long does it take to get 6 confirmations with confidence of 99%

I had this question in an exam but I was not very sure how to solve it: Suppose Bob the merchant wants to have a policy that orders will ship within x minutes after receipt of payment. What value of ...
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1answer
357 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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1answer
174 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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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
2k views

Get the number of confirmations for an external address

I'm building an application that tracks transactions between two points for multiple currencies, currently: BTC, BQC, BTB, FTC, LTC, NMC, NVC, PPC, TRC, WDC & YAC. I need a way to check the ...
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When we can agree on mempool sorting order, we can just confirm first n-transactions that are at least 10 mins old. What's missing?

When we can agree on a mempool sorting order, we can just confirm first n-transactions (or 80% of transactions) that are at least 10 minutes old. Then, we can transfer (broadcast) the block header ...
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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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503 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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348 views

Confirm own incoming transactions

Is it possible to only mine your own incoming transactions? So you can confirm a Bitcoin transaction (only locally).
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1answer
211 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
2k views

Why transactions' average confirmation times becoming more chaotic?

According to this chart, Bitcoin's transactions' average confirmation times are varying much more widely than they were a year ago. Why would this be? Is it because the daily transaction rate has been ...
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1answer
73 views

Genesis block coinbase transaction without confirmations

Why the coinbase transaction, comming from the genesis block, don't have confirmations? All the others coinbase transactions have confirmations, but not in the Genesis block.
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1answer
452 views

Can a low fee unconfirmed transaction prevent confirmations of following transactions?

To be more precise, consider the following situation: Address A gets an input of 4 BTC. You try to make a transaction from A to B with 1 BTC and a very low fee, which means its unconfirmed for a long ...
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3answers
12k 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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1answer
869 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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1answer
2k 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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1answer
669 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
407 views

In ListReceivedByAddress, what is the meaning of Confirmations if the address is reused?

The API ListReceivedByAddress allows me to view a list a sum* of all the transactions that an address has received. This returns an array listing the sum of what was sent. If the address is reused ...
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57 views

Does total size of the transaction affect confirmation time?

Suppose one pays 1 satoshi/byte for their transactions. Will the confirmation of the two transaction below be different? A) a transaction of 1 inputs and 1 output (~192 bytes) B) a transaction of ...
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1answer
257 views

Why are transactions taking so much longer in the last few days (2017-10-29)

I noticed that in recent blocks there has been lots of transactions that has been waiting for as many as 3 days. For example, just randomly picking a block 492200, which was produced on 2017-10-29 ...
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2answers
1k views

0 fee transactions - possible that they never confirm?

I've made a Bitcoin tipping service for reddit: https://news.bitcoin.com/bitcoin-tipping-reddit-minitip/ Currently users pay a flat 0.1 mBTC miner's fee to tip others since it's done entirely on-...
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1answer
616 views

can someone explain what i did wrong here? (btc transaction with fee not confirming) [duplicate]

https://blockchain.info/tx/c782b48bba09dea21896b7c58292abaec81d7ce2db2975f30b77176dddad492c was the fee not high enough? i have never had an issue with fees using the recommended amount that bitcoin ...
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1answer
714 views

Streaming API for confirmed transactions?

Is there an API that makes streams transactions as they're confirmed? Everything I can find seems to just be putting out unconfirmed transactions in realtime, rather than waiting for confirmation. To ...