Questions tagged [reverse-transaction]

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

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36
votes
3answers
8k 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? ...
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
3answers
1k 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 ...
16
votes
7answers
32k 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?
12
votes
3answers
127k 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!
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 ...
11
votes
3answers
672 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 ...
10
votes
1answer
2k views

Bitcoin automatically diverted to bech32 address

I sent bitcoin to an address starting 3Cn using Electrum but the blockchain viewers seem to show that it has gone to an address beginning bc1 as shown in the link below. Transaction Viewer How can ...
4
votes
1answer
474 views

Why can bitcoins never be refunded unless the receiver agrees to send back the money?

I have used a number of ecurrencies and they all seem to share what I've never understood about BTC, which is that once it is sent, it's gone. Often BTC are sent but legally should be refunded, but ...
4
votes
4answers
3k 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... ...
4
votes
1answer
161 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?
3
votes
1answer
259 views

How many transaction and btc have been cancelled?

How many btc have been transferred in orphan blocks, but then never included in any later block? How many btc have been transferred in zero-confirmation transactions that have never been included in ...
3
votes
2answers
1k 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
1answer
2k 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 ...
1
vote
3answers
915 views

I have sent a person some bitcoin. He never sent me the goods. How can I get my funds back?

I have been scammed by a person and I want to dispute a bitcoin transaction.
1
vote
2answers
342 views

Refund a transaction send twice

By mistake, I have send second time 0.09923 BTC to bitcoin address: 15qMMPEa4M26XX4KqXxrvD5yjNwfETg3Hx via transaction id:0a5c7ea12bd84b1dfeea4972d6415c28d6846d83c5fb00f56cf4f6d20c05f4da I did the ...
1
vote
1answer
1k views

How do I get my bitcoins back if they got sent to an incorrect address?

I loaded my localbitcoin wallet with a total of $100 - I did 2 separate transactions. The first time I added $50, I tried to send half of it to cardrockcafe but it never showed up, so I tried to add ...
1
vote
2answers
42 views

Are sellers more vulnerable to fraud than buyers when doing business?

The Bitcoin white paper says: Completely non-reversible transactions are not really possible, since financial institutions cannot avoid mediating disputes. ... Transactions that are computationally ...
0
votes
1answer
519 views

How long does it take for an unconfirmed transaction to reverse?

I have had an unconfirmed transaction for 1 week. Will this transaction automatically reverse or do I need to do something?
0
votes
1answer
181 views

Is it possible to reverse a confirmed transaction? [duplicate]

I have been scammed by a so-called "trading account manager", he kept stalling until he told me my account had a problem and needed to be "rectified". Then, he told me I had to pay $300 for that, so I'...
0
votes
1answer
68 views

How can I reverse a Bitcoin transaction mistakenly sent to the wrong address?

I bought a bitcoin cash at a place called Bithumb in Korea and mistakenly copied the bitcoin address and sent it to the wrong. Obviously my fault is, but the fact that I can't get the cancellation ...
0
votes
1answer
300 views

I want to block my transaction [duplicate]

I made a payment to somebody and now he is not replying me regarding the product I made the payment for and think its a fraud. So I want to block the transaction. All I have is the QR code of the ...
0
votes
1answer
419 views

Unconfirmed Transaction, what can I do? [duplicate]

I sent a small amount of bitcoins from my electrum wallet. I control both addresses either side. the transaction can be viewed here https://blockchain.info/tx/...
0
votes
0answers
71 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 ...
-1
votes
1answer
65 views

can I recover the change of a TX?

I was reading and I have a question, if you please can help me. I send 0.00335 BTC in this TX: bf3eedc1929042444e62badaf885a8dd49333c31ff40d023175a90da241ec2e0 and I see the 0.00335 as spent, but the ...