Questions relating to how particular transactions can be undone or replaced.

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3
votes
2answers
406 views

Is there a standard procedure for refunding Bitcoin transactions?

I work for an online retailer, and we're currently testing a Coinbase payment implementation for our checkout. One of our big concerns is being able to send a refund in the event that we're unable to ...
2
votes
3answers
230 views

How can a Bitcoin consumer and a Bitcoin seller mediate disputes?

Since Bitcoin payments are non-reversible, what technical and business solutions are there to mediate issues such as Product wasn't as expected Payment was double spent or in an invalid chain etc... ...
0
votes
0answers
66 views

Bitcoin-qt to input.io no confirmations [duplicate]

I sent 2.4 BTC from the vanilla bitcoin client to my input.io wallet. The bitcoin-qt client didn't ask for any fees and sent instantly. In transaction details it shows 0/3 confirmation and no ...
2
votes
1answer
740 views

I've sent a small low priority transaction with insufficient fee with blockchain.info wallet, what will happen next?

I've sent a transaction which has a <0.01 BTC output, with zero fee using blockchain.info Android client. It is not being relayed (violating memory pool rules of bitcoind). What can I do to recover ...
3
votes
1answer
12k views

How long does it take on average to receive one confirmation? Is it still reversible?

Hi! Based on your experience, how long does it take to receive one confirmation for any given transaction which has payed the standard miner's fee? Is it still reversible? Thanks!
6
votes
1answer
6k 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?
8
votes
2answers
732 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 ...
4
votes
1answer
119 views

How does the network determine whether to replace a transaction?

Further to this question, how does the network determine whether to accept a new version of a transaction as a replacement transaction? Could an attacker replace transactions maliciously?
22
votes
1answer
734 views

What are checkpoints?

I often read that checkpoints protect the network from a 51% attack because an attacker cannot reverse transactions made before the last checkpoint. How exactly does this checkpoint mechanism work? ...
9
votes
3answers
541 views

What can be done to mitigate the risk of a Finney-attack?

Related Question: Would a reduced block generation time make the Finney attack more difficult? I understand that the Finney-attack is the main reason why accepting a zero-confirmation transaction ...
15
votes
3answers
704 views

Can a bitcoin transaction be reversed from the receiving end?

I know this seems like a duplicate of the question 'Can a bitcoin transaction be reversed?' but none of the answers there were explicit enough as they all seemed to assume reversal triggered from the ...
8
votes
5answers
3k views

Can a bitcoin transaction be reversed?

If I sent bitcoins to someone, but then want to cancel this transaction after it was already made (like a chargeback on a credit card), is this possible with Bitcoin?