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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How Does the Blockchain Recognize Locked UTXOs in a PSBT if the PSBT Isn't Stored On-Chain?
I'm currently exploring the use of Partially Signed Bitcoin Transactions (PSBTs) and have a question about the locking mechanism of UTXOs during the signing process. I understand that as a first ...
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Handling UTXOs in Partially Signed Bitcoin Transactions (PSBTs) and Potential Double-Spend Scenario
I'm working with Partially Signed Bitcoin Transactions (PSBTs) and have a question about the behavior of transactions when the same UTXOs are involved in multiple transactions. Suppose I have a ...
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How feasible is a double spend attack?
Each source of information I look at that tackles this problem states that this type of fraud is essentially impossible at best and highly infeasible at worst. By my (very limited) understanding, the ...
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Strange double-spending attack possibility
In Bitcoin you can have different UTXO with different public keys in a single transaction.
So suppose someone broadcasts a transaction with sending 10000 BTC. Theoretically I can copy this transaction,...
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is consensus needed when double spend attacks cannot happen(assume ideal case)
Suppose double spend attacks cannot happen(assume senders, miners etc are all ideal actors) in a network like BTC for cryptocurrency transactions. I am assuming still fork can happen if two miners ...
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Why is not good having forks in a blockchain?
To be more specific, if I imagine to work with isolated transactions chained to each other according to money flow, then I understand that we wish to have a single chain because forks would mean the ...
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What happens if I `sendrawtransaction` but tx is invalid?
I manually select from my UTXOs, sign the tx (offline programmatical signing, not with wallet) and only interact with bitcoind when I call sendrawtransaction. But in the meantime another process might ...
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Transaction with txin, which ran out of money
How does transaction validation verify that I am not trying to send transactions with the same txin? Does transaction validation go through all the blocks and make sure I'm not trying to write off ...
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Be notified when node rejects TX from mempool
I need to be notified on my C# backend implementing NBitcoin when my node detects a double spend and rejects a TX from its Mempool.
Is there a RPC call or some kind of events that I can register to to ...
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How is the double-spend problem related to the Byzantine generals problem?
I’ve read that Bitcoin’s key innovation is solving the double-spend problem. I’ve also read that Bitcoin solves the Byzantine generals problem.
Are the double-spend and the Byzantine generals problem ...
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Modelling random walks for double spending based on hashrate
I'm reading Analysis of hashrate-based double-spending where the following assumptions are made (on page 5):
The total hashrate of the honest network and the attacker is constant, say H. Let the ...
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How 2 chains co-exist together?
I am not able to understand, how 2 chains co-exist together, like these were the observations which are ambiguity for me:
In one reading I have read, Only longest chain is valid and and rest chains ...
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How does Bitcoin prevent double-spending without penalizing miners?
In the network nodes below as shown in picture:
Let's say A is trying to double spend by sending bitcoins to B,C (A->B) and (A->C) and let's say A tried to relay (A->B) transaction to honest ...
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Can miners double-spend with two transactions in one block?
Let's say Alice sends 5 BTC to Bob and Alice tries to make double spending by again sending those same 5 BTC inputs to carl and lets say that Alice is also a one of the miner node.
Here Alice tries ...
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What is an inflationary bug in the context of bitcoin?
I often hear that the worst bug that could impact bitcoin is an inflationary bug.
But what exactly is meant by 'inflationary bug'?
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