Collects questions concerned with the practice of accepting transactions before they reach their first confirmation, i.e. "zero-confirmation".

learn more… | top users | synonyms

2
votes
1answer
32 views

What does a merchant need to do to reject RBF transactions

I understand replace-by-fee transactions are no threat to merchants who require multiple confirmations. However many businesses still accept 0 confirmation transactions as a means of improving ...
0
votes
0answers
10 views

bitcoin core transaction stuck at 0 Confirmations [duplicate]

So i just started using bitcoins like a week ago , sent out my first transactions and it's been like this for over 12 hours now , ...
0
votes
1answer
133 views

Why is this unconfirmed?

Can someone tell me how to get a confirmation please or cancel this; e8c5489abcb60ecdb925ac880ec1e238c9a65ca4c5480065a6ca268bf00ea7ba-000
0
votes
0answers
16 views

BTC transaction from core wallet 0 confirmations 5 hours [duplicate]

This is the first time that I have seen anything like this from my core wallet. I attempted to deposit to Bittrex and it has been pending now for over 5 hours with 0 confirmations. Is there anything ...
1
vote
1answer
85 views

What is the risk of waiting for just one confirmation to validate a transaction, assuming the counterparty is not a miner?

I am trying to determine how many confirmations would be reasonably safe to wait before accepting a Bitcoin transaction from an attacker that is not a miner and hence cannot rely on Finney attacks, ...
2
votes
2answers
240 views

Why has this blockchain transaction not confirmed?

ea5ee0a3734356a71b2b39deafb656715bad42fb297497f7f694d4a7a0f6335c Is due to the fee being low 0.0001? or something else?
3
votes
3answers
318 views

Could Bitcoins (or any other blockchain based cryptocurrency) feasibly ever be used for purchases that need to go through fast?

Today, one of the problems with cryptocurrencies like Bitcoin is that it takes quite some time for a transfer to go through and enough confirmations to take place. This really isn't a problem when it ...
-1
votes
2answers
295 views

Why were BTC not accepted in the Humble Borderlands Bundle?

AFAIK, so far, BTC has been accepted in every Humble Bundle since they started accepting them… instead they weren't an available option with the Borderlands bundle. Is there an official, ...
4
votes
1answer
274 views

If Bitcoin transactions require ~10 min to clear, how can payments get recognized within seconds?

Bitcoin Monitor offers to issue a notification moments after a payment is sent to a Bitcoin address. Yet, if Bitcoin transactions require about ~10 min to get written into the blockchain and confirmed ...
3
votes
1answer
82 views

Is there a way for merchants to insist on a tx fee to increase likelihood of the tx (eventually) being accepted into the blockchain?

I understand that some transactions may never get into a block, esp those with zero fee or with a fee below the current suggested minimum (which makes me wonder about tx fee inflation, but that's ...
6
votes
2answers
475 views

Could any standard fee transaction be double spent by using a higher fee?

I realize that if somebody makes a transaction without any fees and there have not yet been any confirmations, then the transaction could be double spent by just spending the same inputs to a ...
3
votes
1answer
623 views

How can Blockchain.info wallet send unconfirmed bitcoins?

So i just opened a Blockchain.info wallet after years of using Bitcoin-qt. My Blockchain.info wallet had an empty wallet, i sent some bitcoins to it and right after that without waiting for ...
1
vote
0answers
172 views

How big is the chance of double spending for 0, 1, 2, 3, 4, 5 and 6 confirmations?

I'm messing around with bitcoins a bit, and I'm now looking at the confirmations. In several places I read that 6 is the "normal" figure of confirmations needed to say a transactions has actually and ...
4
votes
1answer
741 views

Get notified of incoming Bitcoin transaction, as soon as it broadcasted

After a few weeks of searching for an answer, I decided to ask here. I want to accept a Bitcoin payment, to a specific wallet, and immediately, when the user approved the payment, to receive an ...
13
votes
4answers
463 views

How secure is zero confirmations?

I sent a small amount of BTC to someone and she was notified within seconds. But the first confirmation did not happen for ten minutes or so. What is the chance that this transaction could fail ...
13
votes
3answers
38k 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 ...
21
votes
3answers
4k views

How does Satoshi Dice's 'zero confirmations' transaction system work technically?

The popular bitcoin betting game Satoshi Dice sends back payments very fast, they don't wait for confirmations. The user sends money to Satoshi Dice and gets back winnings a couple of seconds later. ...
6
votes
2answers
980 views

Can I spend a coin sent to myself before it confirms?

If I spend the entire balance in my wallet to another address in my own wallet, do I need to wait until it gets one confirmation in order to spend it, or does the client know it is my own funds and ...
6
votes
3answers
365 views

What nodes are best for lessening the risk of loss from a race attack

A successful race attack is one where the payment recipient's node receives a spend transaction yet the next block that is mined has a different transaction that spends the same coin. Thus the ...
9
votes
2answers
899 views

Double spend attack by sending higher fee transaction directly to the pools possible?

The standard client prioritizes TXs by the time of receipt, e.g. a conflicting transaction will not be relayed. This is not enforced by the network, though. Is there anything that would prevent this ...
11
votes
4answers
2k views

How do I safely accept bitcoins without waiting for confirmations?

Are there any arbitrators that would guarantee the bitcoin transaction such that no one has to wait ten minutes to confirm the transfer of the said bitcoins?