Questions tagged [unconfirmed-transactions]

This tag should be used for unconfirmed transactions, transactions that have not yet been included in a block.

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144
votes
10answers
319k views

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 ...
40
votes
2answers
33k views

Do unconfirmed transactions expire?

Do they just sit there unconfirmed (e.g. when you be evil and don't pay a tx fee) forever? Or do they get deleted after a few days?
34
votes
10answers
133k views

How to unstuck a low-fee transaction with blockchain.info?

I've sent a transaction from blockchain.info, but accidentally included too little fee. What can I do to cancel the transaction or speed up the transaction's confirmation? This is a complementary ...
28
votes
3answers
12k views

How do transactions leave the memory pool?

How does my bitcoin core client know when to drop a transaction from the memory pool? Is it as simple as a specific period of time?
21
votes
1answer
558 views

Have any SPV users lost money because they accepted forged bitcoins?

I'm making a list of real-life examples of occasions where bitcoins were lost to various known attacks. One of these known attacks is that lightweight (SPV) wallets can't verify whether a transaction ...
20
votes
2answers
41k views

Is it possible to cancel an unconfirmed transaction?

If you submit a transaction to the network but it hasn't yet be confirmed by a block, is it possible to cancel this transaction?
18
votes
4answers
60k views

What happens if your transaction is never confirmed?

If I have a low amount and don't include a fee, the transaction takes forever to get confirmed. What happens if it never gets confirmed? Can the wallet that I sent it to still spend the money?
13
votes
6answers
6k views

So I mined a block, but why would other nodes accept my mined block?

When a miner finds a hash and is thus able to confirm a block of transactions, that miner will then broadcast the confirmation (block?) to the other Bitcoin nodes so that it can be added to the ...
13
votes
5answers
15k views

Is it possible to add a miner's fee after you send your bitcoins?

I accidentally sent a transaction without a miner's fee and I need it to clear as soon as possible. But, as far as I can tell it's going to take days if it goes through at all. Is there any way that I ...
12
votes
1answer
5k views

Replace-by-Fee vs Child-pays-for-Parent?

Both RBF and CPFP attempt to solve the problem of transactions not confirming because of an insufficient fee. What are the pros/cons of using one vs the other? Are both currently functional and ...
12
votes
4answers
22k views

How to unstuck a low-fee transaction with Electrum?

I've sent a transaction with Electrum, but accidentally included too little fee. What can I do to speed up the transaction's confirmation or to replace it? This is a complementary question to Why is ...
11
votes
2answers
2k views

Can someone outline the full pros/cons of the various Replace-By-Fee proposals?

I've done some research myself, but I find that I'm either biased myself, or my sources themselves are biased. Does anyone have an objective analysis of the various proposals and their advantages/...
9
votes
1answer
5k views

Is it possible to view unconfirmed transactions with the bitcoin client?

This site shows you unconfirmed bitcoin transactions: https://blockchain.info/unconfirmed-transactions As I understand it, these unconfirmed transactions are received and rebroadcast by every bitcoin ...
8
votes
2answers
403 views

Spending output of a low-fee transaction by following with higher-fee transaction

Suppose I broadcast a transaction A with very low (or zero) fee. Normally, it would take a long time to confirm. Suppose, then I broadcast another transaction B that spends a (yet unconfirmed) output ...
8
votes
1answer
13k views

How do you apply “-zapwallettxes” on Windows?

On May 27 I tried to sell some Bitcoins(for the first time). Since that day the transaction is in the status "unconfirmed". The amount is booked from my wallet, but isn't booked to my bank account. ...
8
votes
1answer
320 views

What is the largest number of blocks a transaction has ever waited for confirmation?

What is the largest number of blocks a transaction has ever waited before eventual confirmation? Please exclude: Transactions with no fee Transactions delayed because of unconfirmed inputs ...
7
votes
2answers
6k views

Do unconfirmed transactions expire after some time?

Sometimes confirmation process is very slow. I think that is because of the price of the fee. In that time, is it possible to cancel the unconfirmed transaction and re-send with higher transaction fee?...
7
votes
2answers
2k views

How does an SPV node verify an unconfirmed transaction?

Alice pays Bob 1 BTC with a simple pay-to-address type transaction. Three seconds after Alice broadcasts her transaction, Bob's Simplified Payment Verification (SPV) wallet displays a message saying ...
7
votes
0answers
27k views

Blockchain - How can I cancel my blockchain transaction, unconfirmed after +1 day [duplicate]

I am using blockchain.info. I have made a bitcoin transaction of 4.79 BTC to the address 1DWaEfPbcKQvjMi9D9eNMrVRQzWiSLVvaS. (exchanger) You can see the transaction at https://blockchain.info/tx/...
6
votes
3answers
9k views

What does “lock time” mean?

I got a transaction that is still not confirmed for about one week, and I can see a field called "Lock Time" that says: Lock Time Block: 419382 https://blockchain.info/en/tx/...
6
votes
1answer
2k views

Requirements to accept and send SegWit transactions?

I roughly understand how SegWit works, but not the details, got a few practical questions. If I understood correctly there are separate 'SegWit addresses'. How does that work, do they look like ...
6
votes
1answer
363 views

Can an unconfirmed transaction fall under the radar?

Something very peculiar has happened with a transaction and I would like to understand what network conditions can possibly be the cause of this. I transferred about 150mBTC from my Android wallet ...
6
votes
1answer
453 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 ...
5
votes
2answers
582 views

Are Micropayment channels still subject to malleability after BIP65?

After BIP 65, are simple, unidirectional, MPC still subject to transaction malleability? More specifically: Is the payee at risk because of malleability? If yes, how? (as far as I understood, the ...
5
votes
3answers
2k views

Replaceable transaction or Non-replaceable. How can I identify it from raw transaction?

I created two transactions on Electrum Mac client. The first tranaction is replaceable and the other is non-Replaceable. The followings are the results of get-rawtransaction of the the two ...
5
votes
4answers
260 views

What technical properties does a confirmed Tx have that an unconfirmed Tx does not?

From a user perspective, each block confirmation reduces the probability that a transaction payment will be reversed. However from the perspective of the software, what happens when a transaction is ...
5
votes
2answers
21k views

Why did my Coinbase transaction take 4.5 hours to get in a block?

Why did this transaction take so long to be put in a block? I initiated a 7 BTC transfer at 6:13 PM Eastern Time from Coinbase to an external address in an over the counter transaction today. It was ...
5
votes
2answers
3k views

How to remove unconfirmed, non-existent transaction from QT wallet [duplicate]

I transferred 10 btc from my Coinbase acct to my wallet. The transaction appears twice in my wallet, one went right through and confirmed within minutes, the other has 0 confirmations (after 2 weeks),...
5
votes
1answer
7k views

Transactions seen by peers, but not confirming

I have an old MultiBit wallet (v. 05.16) and within the last month I have experienced delays when transferring bitcoin. Some transfers have been seen by 2 peers and some by 6 peers, but none have ...
5
votes
1answer
3k views

How can I unstuck a transaction sent from Mycelium?

My transaction has been unconfirmed for more than a week. I had a normal transaction fee (not low). The amount of the transaction was not small >0.5btc. The inputs were not unconfirmed outputs. The ...
5
votes
1answer
3k views

Unconfirmed transaction for 2 days despite network fees, rescans and redownload

I made a transaction 2 days ago, (using BitcoinQT 0.8.1-beta on MacOS X) that didn't propagate. I can't find the transaction on blockexplorer or blockchain.info (or anywhere else for that matter) yet. ...
4
votes
2answers
2k views

Coinbase to Block Chain Transfer Delay

I recently sent a friend of mine around $950 in BTC from Coinbase to his BTC wallet on BlockChain.info. The transaction is showing up as completed in my account, but he claims he has not received the ...
4
votes
2answers
647 views

bitcoind getrawmempool without downloading the full blockchain

I'm running bitcoind from a small virtual machine on digitialocean. I'm interested only in looking at the new transactions in bitcoind getrawmempool Is there a way to get these transactions without ...
4
votes
2answers
2k views

It's possible to spend a BTC without fee to forge a payment?

I would like to know if it is possible to make a transaction without fee (probably this transaction will never be confirmed) and some time later to take this money back and spend in another ...
4
votes
2answers
433 views

Can I see all transactions not included in a block yet?

I'm running bitcoind and would like to see which transactions I've received but haven't been included in a block yet. Is that possible, or do I need to run special mining software to see that?
4
votes
2answers
637 views

Why is the transaction priority removed?

As far as I know, in the earlier version of Bitcoin, there was a mechanism about transaction priorities. However, it has been removed (or not being taken into account anymore) and now the only ...
4
votes
2answers
1k views

Is it possible to spend an output that hasn't yet been confirmed?

From something I noticed in this thread: Unconfirmed BTC MtGox will send a transaction to spend one of the outputs of a transaction that hasn't yet been confirmed. Is it possible for both of the ...
4
votes
5answers
945 views

How to find out as soon as possible about a transaction to my payment address?

I'm running an online store. I added the option to pay using bitcoin, using Mycelium Gear. Gear can be configured to wait for 0-6 confirmations and up to 48*60*60 seconds from the moment the payment ...
4
votes
2answers
581 views

Does the `blocksonly` setting prevent other nodes from sending my node unconfirmed transaction, or does it simply cause my node to ignore them?

I've seen this option discussed, but I don't have a clear understanding of what is going on. Since this setting appears to reduce node bandwidth by as much as 88%, I assume it somehow communicates to ...
4
votes
1answer
541 views

Another Unconfirmed BTC transaction [duplicate]

Sorry guys & gals - yet another "unconfirmed BTC transaction..". Looks like the fee was too small, but this was sent 72 hours ago now (at the time of writing) https://blockchain.info/tx/...
4
votes
1answer
50 views

Would an increased blocksize lower the stress of the stress tests?

I see that there are about 9000 unconfirmed transactions right now and that five of the last six blocks are under 1/2 Mb and 15 blocks in a row under 750 Kb. This suggests to me that larger block ...
4
votes
1answer
48 views

What happens to transactions in the mempool when their parent transaction expires?

I was just reading the Coin Metrics Newsletter #53, and it included a section about the recent mempool congestion. After mentioning transactions that got evicted due to the network's queue of ...
4
votes
1answer
79 views

How does one create another transaction when all funds are tied up in an unconfirmed previous transaction?

If I have only one UTXO and I spend from it that's fine, I send myself back the change and that works how I expect it to. However if I want to create a new transaction in the time that the first ...
4
votes
1answer
263 views

How safe is sending out transactions using unconfirmed inputs for a service?

I've been running into problems with a high-traffic hot wallet, where a single transaction would lock up any input for a block with the spendzeroconfchange disabled. Would it be safe for a service ...
4
votes
1answer
2k views

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 ...
4
votes
3answers
646 views

What happens when more transactions are created than confirmed? [duplicate]

I am surprised that there are 220k unconfirmed transactions in the blockchain. And more transactions are getting queued in every minute. If 6 blocks are mined in every hour then in an hour only 12000 ...
3
votes
2answers
2k views

Transaction with highest fee, but stuck, what did I do wrong?

I recently sent btc that appears to be stuck (https://live.blockcypher.com/btc/tx/c131d65d933e343f852021830b833123de952c1857f264503388cf642655c457/) The interesting thing is that I used a higher fee (...
3
votes
2answers
1k views

Where are transactions to be confirmed stored?

When a bitcoin client sends a transaction to its connecting full nodes, before that transaction is confirmed, where is it stored? on all full nodes?
3
votes
2answers
77 views

Can a bitcoin transaction from a specific bitcoin address be banned? (via mining pools)

Can a bitcoin transaction from a specific bitcoin address be banned? (via mining pools) Suppose Satoshi Nakamoto wants to send some bitcoin from one of his bitcoin address, can the mining pools ...
3
votes
1answer
2k views

Longest unconfirmed transaction?

I recently tried to make a transaction with coinbase. In a hurry I put no fee though. It's still unconfirmed and blockchain.info doesn't recognize my hash. But my btc qt wallet is debited. My question ...

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