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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156
votes
10answers
368k 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 ...
42
votes
10answers
184k 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 ...
40
votes
2answers
35k 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?
30
votes
3answers
15k 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?
22
votes
4answers
103k 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?
21
votes
1answer
568 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
42k 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?
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
17k 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
7k 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
27k 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
3k 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
6k 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
423 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
2answers
7k 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?...
8
votes
1answer
14k 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
571 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 ...
8
votes
3answers
8k views

How can an unconfirmed transaction be removed from the memory pool?

Using Bitcoind and Json-RPC, how can I remove an unconfirmed transaction from the memory pool? The scenario being that I want to remove the unconfirmed transaction because it's not getting confirmed, ...
8
votes
2answers
1k 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 ...
7
votes
3answers
11k 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/...
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
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
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),...
6
votes
1answer
83 views

Bitcoin.conf setting for CPFP - how can I enable longer 'chains' of unconfirmed transactions?

I often receive an -32700 'Insufficient Funds' error when attempting to create 'child pays for parent' (CPFP) transactions using unconfirmed change output. This can be problematic since it can prevent ...
6
votes
1answer
485 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 ...
6
votes
1answer
378 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 ...
5
votes
2answers
639 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
1answer
7k views

What is the meaning of “Position in mempool” for a transaction?

I am using Electrum as my wallet and when I am receiving a transaction, I see an attribute with the name "Position in mempool" and the value is "8.61 MB from tip". Since the ...
5
votes
4answers
291 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
23k 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
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
1k views

Can I revert a transaction by removing it from the receiver's mempool?

I accidentally sent a payment from my blockchain.info address to my Bitcoin Core address with a really small fee (5 satoshi/byte). The transaction is still unconfirmed, for 4 days now. I heard Bitcoin ...
5
votes
1answer
6k 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

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?
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
692 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
436 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
674 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

Should I increase my mempool size to accomodate temporary crisis?

I am seeing 68k unconfirmed transactions on blockchain.info. My own bitcoind (v0.13.0) node has 49k transactions in its mempool with memory usage currently at 230mb. Knowing that the memory cap is ...
4
votes
4answers
2k views

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 ...
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
1k 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
1answer
484 views

Can transaction inputs reference outputs of pending transactions?

The inputs of a transaction reference outputs of previous transactions. These previous transactions must already be present in the block chain, or can also be pending transactions? I don't know if ...
4
votes
2answers
709 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
554 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 ...

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