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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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Which wallets support double spending?

Which wallets support double spending? i.e. cancelling a transaction with 0 confirmations by using higher fees
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Bitcoin successfully deducted on sender wallet but did not reach receiver wallet

Here is the wallet address for receiver: 1Gouzjo9Jav1k4AmRoUJJMzidVfnMoSieS. I had used the Blockchair site to see and track status. Based on the details, account had seen receiving last 21 hours. ...
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1answer
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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
39 views

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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I made mistake sending Bitcoin to old generated address in nairaex …the transaction still writing unspent…how can I get my Bitcoin back

I got 22 confirmation for Bitcoin not up 50$ and still unspent ,ow can I get it reverse back ,it more than 4hours
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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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1answer
122 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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0answers
52 views

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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1answer
61 views

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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1answer
24 views

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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1answer
41 views

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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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
348 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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1answer
43 views

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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3answers
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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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1answer
105 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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1answer
246 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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1answer
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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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2answers
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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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55 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
28 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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1answer
70 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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1answer
26 views

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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2answers
132 views

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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1answer
60 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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1answer
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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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1answer
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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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1answer
28 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
87 views

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
246 views

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 ...
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1answer
217 views

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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2answers
230 views

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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1answer
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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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1answer
466 views

Bitcoin deposit stuck 0 confirmations high confidence/low priority [duplicate]

hi i have a deposit stuck in the blockchain im not understanding why, its been stuck for 7 hours now without any confirmations, what is the explanation behind why the transaction is stuck? https://...
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0answers
51 views

How to get my unconfirmed transaction to confirm. Stuck for 30 days [duplicate]

My coins were sent with low fees by bitclub advantage. Due to this, the transaction is marked on blockchain as 'unconfirmed transaction'. I have tried to get the sender to reverse the transaction or ...
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8answers
16k views

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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1answer
256 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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0answers
155 views

How long must I wait for a 15 sat/B transaction to be confirmed or dropped by the network? What else can be done? [duplicate]

I know my question will likely be marked as a duplicate, but I do not see how to apply that answer in the case of a Ledger Nano S wallet. Doesn't using the Bitcoin wallet software require downloading ...
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1answer
460 views

Will a Litecoin LTC transaction with a low fee of .001 confirm?

Will a low fee of less than .001 ltc confirm using the coinomi wallet? And if it doesn't how long do you have to wait for it to return the coins back to you?
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1answer
63 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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0answers
29 views

Bitcoin Transaction never confirmed even with a significant fee? [duplicate]

I just had some questions in regards to relating fee/byte to confirmation. From an exchange the withdrawal fee for bitcoin is fixed to 0.0005 btc but the bytes vary very much, and thus you get very ...
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2answers
476 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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1answer
450 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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349 views

As a solo miner how can I prioritize my own unconfirmed transactions?

Is it possible to prioritize my own unconfirmed transaction through my mining machines without being in a pool? And if its possible how can I do that?
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1answer
86 views

Negative time estimation from estimatefees + mempool data

I am currently writing a time estimation tool for Bitcoin, and it gives me wrong estimations, so I am not sure if it's accurate and if I am not doing some error in logic. For example, I have this ...
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1answer
256 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
2k views

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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1answer
205 views

How Long to Verify Payment?

I wish to allow people to purchase items at my shop using bitcoin. I've heard however that blocks take 10 minutes on average to process and transactions may not even be processed in the next block if ...
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2answers
759 views

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 ...