Questions tagged [doublespend]

This tag should be used for questions related to double spending. Double spends are when a money is spent more than one time. This is considered a form of fraud.

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76 views

how to double spend Bitcoin transaction?

How it's possible to double spend a transaction if the transaction outputs are already spent? and why these types of attacks are not preventable? is it about blockchain sync time between nodes?
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Not sure if I accidentally double spent my LTC LITECOIN

LEDGER NANO S - CHROME APP LTC LITECOIN I just sent two transactions (with different amounts) from one address to the same receiver one after another. While sending the second the first was still ...
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How do I double spend using electrum?

I have created a transaction several days ago, with a very low fee. The transaction was meant to remove dust from my wallet, so increasing the fee won't help as the transaction is very big (1.6KB), ...
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69 views

What are the mechanics of verifying that an output transaction is not spent?

I am trying to understand the mechanics of how a bitcoin transaction works. When the output gets consumed by a later transaction, who and how prevents this output from being consumed a second time? Do ...
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2answers
108 views

Can I save stuck bitcoins by creating a completely new transaction? [duplicate]

I tried to make a bitcoin payment but accidently set a too low transaction fee so it got stuck. By now the payment is cancelled so I don't want to do this transaction anymore. Can I now instruct my ...
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498 views

Bitcoin Transaction Stuck, Attempt to double spend with higher fees

I made a BTC transaction a few days ago, where I set the fee amount way too low. It seemed that the transaction was lost in limbo. I did some research, and apparently you are able to double spend ...
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1answer
703 views

From multibit to electrum : low fee and unconfirmed parent

I made 3 btc transfer from my old Multibit classic wallet a few weeks ago (dec. 11), then I discovered that the fee was far too low for the transfers to be confirmed. I then restored my original ...
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1answer
429 views

Ripple's validation of transactions / Ripple white paper?

Is there a ripple white paper or some safe source to understand how the transactions are validated and made in the ripple network? VS Bitcoin, XRP is not mined, so how is the agreement reached? (I ...
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1answer
185 views

Why is CPFP (Child pay for parent) immune to double spend?

Assuming I have 10 Bitcoins in my wallet and I send 4 BTC with a tiny fee and it gets stuck in the mempool due to a low transaction fee. If I understand CPFP correctly I would then send a second ...
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1answer
96 views

Can I double spend this transaction?

b9d6d458f312b6ce2ef27bbb4a4a88f95e4a5db7aa04c9ab1f6225ecde47a77e Can I move it ? Thanks for your help
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63 views

Complete Tech Spec

Where can I find a comprehensive description of exactly how Bitcoin works. I'm not interested in an analogy, I want to know everything, including the maths.
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2answers
99 views

Does the entire blockchain have to be recomputed to validate a transaction?

Are transactions validated by recomputing the entire blockchain? If not, how else can it be confirmed that a bitcoin I'm attempting to transact is one that I actually had come into acquisition of ...
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1answer
901 views

My blockchain.info wallet was hacked. How can I create a double send to foil the attacker?

This is the transaction. https://blockchain.info/address/1F8EP97jgQx8QD6XMRg2bCHHrJrZEMUTRt Which is still unconfirmed. I am trying to use https://coinb.in to create a double spend transaction with ...
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650 views

Unconfirmed transaction / double spend warning [duplicate]

I transferred some coins from my Electrum Wallet to my Coinbase Wallet, however the transaction got stuck as unconfirmed (possibly because of low fees). It has been already 19 days since the ...
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1answer
199 views

Is this considered double spend?

I had a Receive transaction worth 0.185btc I was confident that it was ok since I saw 5 confirmation before I close the wallet. The next day when I checked I saw a sent transaction with 0.185 btc ...
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258 views

After being officially canceled, SegWit2x is live. Will transaction replaying be massive ? If yes what does this means?

As you know, segwit2x was officially canceled last week, but some miners decided to still go forward today, and some exchanges like coinbase plan to support the hard fork. So things will happen like ...
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1answer
124 views

double spend problem and trust

I am very new to bitcoin and sorry if the following is too simple. As far as I understood, if there is a double spend problem, the longest chain - collecting most work - will take over. However, ...
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How does the network know the legitimate chain in a double-spend attempt?

Apologies if this has been covered, but there's one area of the Bitcoin network that is not clear in my head, and it's intimately linked to the double-spend problem. Suppose Person A is purchasing an ...
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1answer
38 views

Can one node receive two transactions from the same user (doublespend)?

I'm learning how the blockchain works. I've read that when someone (say Alice) send twice a transaction to two different peoples (Bob and Charlie) such that Alice has only enough to pay Bob or Charlie,...
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2answers
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Is in-person double-spending attacks negligible on bitcoin payments?

If I'm planning to accept in-person payments in a store, is it negligible a double-spending attack or isn't it too hard to do?
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Bitcoin Paper: Why do we need the probability of catching up in double spend attack?

In the Bitcoin original paper, we have two probabilities: 1- Probability of generating k number of blocks in the period T in which z confirmations are generated. 2- Probability that the attacker ...
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2answers
81 views

What is the average time for an honest network to find a block when its hash rate is p?

let p be the hash rate that belongs to honest network and T be the time a block is found. In the Bitcoin paper it's said "assuming the honest blocks took the average expected time per block...". In ...
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1answer
158 views

do isolated blocks create forks in block chain? (with forks I mean branches that are no longer valid) If yes then how does the node redeem itself? [duplicate]

I'm a newbie to cryto and wanted understand this. what happens to the chain when the isolated block is formed (in case of a double spend) ? Since chains only add blocks that come from the longest ...
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1answer
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Race Attack vs. Double-Spending Attack: are they same?

Race Attack vs. Double-Spending Attack: are they same? I know definition of both attack both some times it is called as "race attack" and most of the time called as "double-spending". I guess (maybe) ...
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2answers
512 views

100% double spending attack probability

When we plot the attacker's computational power against the probability of double spending with a number of blocks equal to zero, we always get a chance of 100%. This plot is based on the original ...
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2answers
263 views

Double spending on testnet or regtest?

I'm currently doing a research on bitcoin and I would like to know if there is anyway to replicate double spending in the testnet or regtest? If isn't possible is there any other type of "attacks" ...
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290 views

What happens if I spend a bitcoin that has 1 confirmation?

Take these two transactions that happen one after the other: Transactions: 1) Exchange A -> (1 confirmation) My Wallet 2) My Wallet (With a high fee) -> Exchange B (needs 20 confirmations) ...
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1answer
41 views

Misledgering possibility for double spending attack

Imagine a malminer with two important abilities: having enough hashrate for producing blocks in a single-miner mode in reasonable amount of time and having a malconfigured miner software which doing ...
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1answer
353 views

How spending same coins both at BCC and BTC blockchains prevented? [duplicate]

------X--.---------- BTC Blockchain \ .--------- BCC Blockchain Let's say that we have some BTC coins from a transaction at block X. And, there are two blockchains now. ...
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5answers
171 views

Application of proof of work in bitcoin

Proof of work in spam I understand very well how proof of work is used to prevent email spam for example. Reasoning is since computing the right hash (e.g. with predefined number of zeros for example)...
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1answer
687 views

Mining two block at the same time

Reading the question and the answer What happens if two miners mine the next block at the same time?, I completely agree with the answer, but there are still 3 very interesting open question: How ...
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1answer
214 views

How does Bitcoin protect against doublespends?

I am trying to understand the blockchain and I have read a bunch of these explanations, but they all don't address some of the questions I am still wondering about. So first I'll explain what I know, ...
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2answers
260 views

Is something gained by double spending myself on a 51% attack?

I try to understand what consequences double spending may have. Let's assume I own 51% of the network and own three bitcoins wallets. If I double spend the coins from Wallet A to B and C - would I ...
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182 views

How would one relay a raw tx double spend to a node that accepts it?

All of the pushtx sites reject the tx as a double spend. Would I have to run my own node through bitcoind? How would one do this?
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1answer
148 views

Is there a visualisation tool for discarded block chains in Bitcoin?

A lot of papers about cryptocurrencies explain the concept of the "longest chain", which goes along with these kind of figures: I was wondering if there exist any kind of visualisation tool for these ...
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1answer
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How do nodes behave in light of a doublespend?

Recently I have been studying on the bitcoin. while going through the double spend process, I found this link as How do I detect a double-spend? and an answer there describes different scenarios: ...
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2answers
3k views

How does a double spend get resolved when two miners find conflicting blocks at the same time?

I was trying to learn about Bitcoin and its flow. Actually, I was stuck how the control flows in solving the double spend. For eg. if Ta and Tb are a double spend of the same transaction with ...
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2answers
554 views

Why does only the earliest transaction matter for double spending?

On page 2 of Bitcoin paper, it says: The problem of course is the payee can't verify that one of the owners did not double-spend the coin. A common solution is to introduce a trusted central ...
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3answers
926 views

How would a centralized block chain work?

If I'm a company who pays my employees and my supply chain with my own currency created on a block chain and they can spend it wherever it is accepted, would I need a POW or POS scheme to maintain the ...
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0answers
576 views

Is double spending with electrum still possible?

I tried to follow this tutorial, but I kept on getting an error message saying that there was a mempool conflict and that it was rejected by the network.I even used a script so that the mouse clicked ...
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2answers
169 views

Detecting unconfirmed double spends using bitcoind

I want to get statistics on how many percentage of unconfirmed tx in the mempool are having attempted double spends and having what value. For this I want to get notification when an unconfirmed tx ...
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2answers
2k views

Negative Bitcoin Balance

I was playing around with bitcoin and I discovered an address that appears to have a negative balance on the blockchain. The details of this address are below. At the time of writing the blockchain ...
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2answers
667 views

blockchain.info says my tx is double spend. Which tx use the same utxo?

My transaction is marked as double spend. I don't remember when I spent it twice. How can I see what transaction used the same utxo? https://blockchain.info/ja/tx/...
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1answer
801 views

How does SPV prevent double spending of UTXO?

I am new to Bitcoins. I have read about how double spending is prevented in Bitcoins. Suppose A, a peer, receives 'B' BTCs from various transactions: B1,B2,B3, etc. Also, A had spent 'S' BTCs in ...
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2answers
522 views

Why most bitcoin wallet apps don't have Replace-by-fee feature?

As a bitcoin user, it seems that Replace-by-fee feature is useful to solve the problem of transactions not confirming because of an insufficient fee. However, as far as in know, most bitcoin wallet ...
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2answers
175 views

How confirm my own doublespend transaction got confirmed

Transactions in the testnet are right now almost always double spent with a new txid (possible due to tx malleability). This is actually quite nice for testing purposes. So I'm wondering - when I ...
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994 views

Unconfirmed bitcoins 258: txn-mempool-conflict

I made a transaction a few days ago, but the fee was to low so it doesn't get confirmed. So I want to give the transaction a higher fee. But when I resend the transaction I get this error: 258: txn-...
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1answer
1k views

Low fee Electrum wallet transaction disappeared, now when I increase the fee it seems to be rejected as a double spend

Can anyone tell me what is happening with my transactions ... First I move some small amount and didn't see that fee was set up to low so it was "low fee" after that I've made another one and It get ...
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409 views

Double spend question during fork

What happens to a double spend during a fork where one of the transactions are in a orphaned block and the other in the main chain? 2 transactions get broadcasted in the network and 2 conflicting ...
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0answers
1k views

Bitcoins unconfirmed even after double spend

I'm very new to bitcoin and recently bought 0.066 bitcoins and transferred them to my electrum wallet. I then transferred them to another wallet but I set the fee too low (40Sat/b) and it was stuck in ...