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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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Genesis block coinbase transaction without confirmations

I'm a little bit lost. 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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Is Block Finalization a valid development to remove the threat of 51% attacks?

https://www.reddit.com/r/btc/comments/bq8cqo/btctop_currently_has_51_hashing_power/eo2p4md?utm_source=share&utm_medium=web2x A recent comment from a Reddit user in response to BTC.top acquiring ...
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Can bitcoin exist without miners?

In the past year only, the bitcoin mining difficulty has increased fivefold. If in the coming years the difficulty increases so much that mining is no longer profitable (i.e. consumes more power than ...
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How to confirm transaction any altcoin PHP

I'm working on a webapp right now (for me personally) and I now come to the part where I want to validate if someone send me a certain amount of altcoin, lets say Verge, and if I received said amount ...
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How to check if confirmation is done or not yet?

After sending Bitcoin to any address, how can I check if the transaction has at least one confirmation? Should I poll the transaction repeatedly or is there any event when confirmation is made.
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How can I accelerate confirmations in ledger nano s?

I am using Ledger Nano S hardware wallet to store my bitcoins. Last week, for an experiment, I decided to send bitcoins to hitbtc currency exchange with zero btc fees. I was wondering how many hours ...
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153 views

mSigna: Signed, send, but 0 confs despite high fee (0.001 BTC)

Tried to send my first tx from mSigna today. Receiving was painless, but the send does not get included into a block since half a day, and dozens of blocks passed. I unlocked the account, created ...
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What is the purpose of having multiple confirmations for Bitcoin? [duplicate]

For example, why does Coinbase require 6 confirmations for a Bitcoin transaction to be awarded instead of just 1? Is 1 confirmation not proof that the transaction is legitimate? Or is there something ...
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Instant confirmations with pre-published, locked, transactions

(Clarification: This is not an attempt to solve the problem of a vendor taking the money and running without handing over the merchandise. Problems like that can't be solved without some third party. ...
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1answer
65 views

Negative number of confirmations for a testnet transaction on blockexplorer

I am curious about the test transaction f72f59a32c1bac47ec87bc3678ec44e98eece5e235d29d79cd1f5461ccc5bf38. Depending on which site I view this transaction, the number of confirmations is positive or ...
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10answers
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Why is my transaction not getting confirmed and what can I do about it?

I sent a transaction without (or with an exceptionally small) transaction fee using extremely small or unconfirmed inputs while the stars were not standing right. For whatever reason, I have been ...
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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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Blockchain.info confirmation misunderstanding

I have some misunderstanding regarding how confirmation work on blockchain.info. If we go to payment history we can see info about confirmation in two places. First in history of all transactions. ...
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592 views

How to perform a double spend attack in websites that accept transactions with 0 confirmations?

To perform a Finney attack or a 51% attack I need to have lots of computational power, but in this case (a website that accepts transactions with 0 confirmations) it seems to me that I only need to ...
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What does “Nonstandard output” mean on Tradeblock transaction page?

I tried to send bitcoin but the recipient hasn't received it. The trade block page shows "Nonstandard output" under outputs as shown in the link below: Tradeblock page for transaction I used an ...
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Shortest and Longest block interval time ever recorded in Bitcoin

Bitcoin block interval time is on average 10 minutes, that is the difficulty is adjusted in such a way that every 10 minutes a miner will manage to find the right hash. This is just an average time ...
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Can you mine without transactions?

As far as I know, mining means verifying transactions and thus keeping the Bitcoin network alive. Today, at a local meetup, some people have informed me that mining doesn't need transactions. They ...
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how to prevent losses after a hard or soft fork

i learned about hard and soft forks from this question; now i have a basic understanding about forks; but the answers of that question did not say what happens to transactions on the stale chain; if i ...
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250 views

Why is the Bitcoin blockchain designed so that a block can be unconfirmed?

I have a basic question about blockchain and Bitcoin. After a transaction is confirmed and included in a block, it is said to have a depth (confirmation) of one. However I've read that many ...
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confirmations: 0 vs confirmations: -1?

I'm looking at a bitcoin clone, not sure what codebase it was cloned from, but I've noticed that the listSinceBlock output sometimes includes: a receive that has 0 confirmations a send that has 0 ...
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2answers
354 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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2answers
295 views

Why do transactions take so long to confirm in testnet?

I have created a transaction with high miner's fee and it is now in mempool (in testnet): https://live.blockcypher.com/btc-testnet/tx/abcc4ce473f490896e87102fe3ffb857ff735a0fc97525dadf9c5b0ed5410f9f/ ...
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How do I know one transaction has confirmed?

I am running my bitcoind with -zmqpubhashtx optional, and I receive notification once a new transaction has broadcast to public chain! I can also parser it by getrawtransaction and ...
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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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2answers
359 views

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 confirmation make it unprofitable for a double spent attack for a given amount

I'm reading through an explanation about 6 confirmations on stackexchange which eventually lead to this: https://bitcoil.co.il/Doublespend.pdf Having a hard time internalize that complex math, so I ...
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79 views

Is it normal to get 60 confirmations for a transaction in blockchain

Is it normal to get 60 confirmations for a transaction in blockchain and still it is not received and confirmed, can you help I m worrying as this is my first transaction, did I forget anything
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178 views

What happened to Bitcoin testnet? [duplicate]

What happened to Bitcoin testnet? Confirmation time is very short. 10 confirmation occurred in three minutes. I use Bitcoin core v0.16.0 (64-bits)
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Definition of confirmation time in blockchain.info, Part 2

In my previous question (Determinant of confirmation time), I asked "What will be the definition of confirmation time and data used for https://blockchain.info/charts ?" Now I read "The classic ...
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32 views

Determinant of confirmation time

There seems to be a lots of variations in confirmation time. https://blockchain.info/charts/avg-confirmation-time I would like to understand factors that affects the confirmation time.
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43 views

Definition of confirmation time in blockchain.info

What will be the definition of confirmation time and data used for https://blockchain.info/charts ? I would appreciate confirmation.
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1answer
27 views

Custom bitcoin confirmation process

I am implementing a payment module for bitcoins. I have the following case. I need customers to be able to pay in bitcoins. But for some reasons I cannot use existing solutions like Bitpay. ...
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61 views

How to increment the number of confirmation of a transaction? [duplicate]

Sorry for this naive question, but honestly it is going to be a great help for me. Say I am tracking a specific bitcoin transaction('TX_1') form bitcoin core. A confirmed block had the transaction ...
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How to know whether my transaction is fraudlent after one confirmation?

Let's say if the transaction tx_1 has one confirmation. But the tx_1 is fraudulent. Can it be rolled back? Here I am storing the confirmed blocks and if my transaction is in the block-1 then the ...
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Why are Bitcoin transactions sometimes confirmed instantly if blocks are mined every 10 minutes?

I have a basic question on Bitcoin and blockchain: Sometimes transactions are confirmed almost instantly, but there should be a new block every 10 minutes, so how is it possible? A transaction can be ...
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1answer
42 views

Meaning of confirmation within n blocks? [duplicate]

I have a hard time understanding the meaning of below sentence: "To confirm within 48 blocks, a transaction fee of 1 satoshi/byte is required." I have 2 questions here: 1) Does this mean that the ...
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2answers
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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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How can low latency and high scalability be achieved with increased block size in BTC?

One of the solution to address low latency and high scalability in BTC is to increase block size. A single block takes 10 min on average for proof-of-work. Increased block will also take same time for ...
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2answers
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BlockChain scalability: How does BlockChain process multiple parallel transactions?

I just did some introductory research into blockchain technology and this is a breakdown of my understanding of how it works: Scenario: Assume Trump wants to send Obama 5 bitcoins. As soon as this ...
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47 views

ways to improve bitcoin tx finalization time

On GDAX website, they claim that 3 confirmations is needed to finalize your tx in. I assume they've done thorough research on this and might've come up with some logic to protect themselves from ...
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When we're calling `getrawtransaction` how does Bitcoin-core calc and verify confirmations?

if a transaction has 10 confirmation, does bitcoin-core check if the txid exists in the last 10 blocks? or its calculated based on transaction block number?
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Confirmations in block and trasaction

From the bitcoin RPC, both gettransaction and getblock returns a confirmation number in their response, are they always the same? Is there a case a transaction's confirmations isn't the same as its ...
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Checking pending (not yet in the blockchain) transactions

Is there a service (like Blockexplorer) that shows pending transactions that have not (yet?) been included in the block chain?
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2answers
5k 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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3answers
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Is every bitcoin transaction (eventualy) validated by every miner? [duplicate]

I can see that my bitcoin transfers becomes real when my exchange detects 2 or more confirmations. I believe each confirmation is a validation. Am I correct? If so, How many confirmations will have ...
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1answer
26 views

How can a block regarded as confirmed in bitcoin?

I am a little confused with confirmation mechanism in bitcoin PoW consensus. According to bitcoin wiki: After a transaction is broadcast to the Bitcoin network, it may be included in a block that ...
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3answers
3k views

How does SatoshiDice operate with 0 confirmations?

I understand they use your bet as an input, but what does that mean and how do they do it? Can they use the standard bitcoind as a server against which to run the API from?
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61 views

Confirmed Transaction

If a transaction gets a minimum of 3 confirmations, does that mean that the BTCs have reached the destination address? I have a case where the transaction has gone through multiple confirmations but ...
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Why maturity rule on coinbase tx requires too many confirmations w.r.t an arbitrary tx?

For an arbitrary tx, it is often said that 6 confirmations is sufficient. However, maturity rule states that coinbase tx can't be spent until it receives 101 confirmations. Why do we have this ...