Questions tagged [zero-confirmation]

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

Filter by
Sorted by
Tagged with
133
votes
10answers
303k 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 ...
15
votes
4answers
1k 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 ...
4
votes
1answer
2k 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 ...
12
votes
4answers
3k 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?
9
votes
2answers
2k 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 ...
11
votes
2answers
1k 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 ...
8
votes
1answer
468 views

What is the Lightning Network proposal? What problem is it trying to solve?

We already have a few questions about technical details of Lightning network, however, … What is the Lightning network proposal in the first place? What problem is it aiming to solve?
7
votes
3answers
400 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 ...
2
votes
1answer
164 views

What restrictions are there to the application of opt-in RBF?

It is a common meme in some parts of the Bitcoin sphere that RBF erodes the option of accepting zero confirmation transactions. It would be beneficial if the following questions were answered: What ...
1
vote
2answers
408 views

Can bitcoin be used for instant payment?

As transactions have to be confirmed, does it imply bitcoin cannot used for instant payment?