Questions tagged [double-spending-attack]

Attempt at spending the same coins twice before being noticed by the network

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1answer
58 views

Acquiring greater than 51% of the Monero network can pose what kind of risks?

As I understand it, if a mining operator was to attain 51% of the network, they can perform a double spend. But would this be detected? And if the same attack was done on Zcash, could it be detected ...
4
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1answer
671 views

Any thought on the Minergate hard fork of Dashcoin? Is it a 51% attack?

You can read the whole thing on the Dashcoin thread on bitcointalk.org I'll keep things short. Since Dashcoin is a copy of Bytecoin, it was effected by the same bug found by the Monero team back in ...
4
votes
1answer
221 views

Monero double spends in the txpool

If a transaction A enters the txpool at timepoint A', and then a second transaction B enters the txpool at timepoint B' at a location distant enough to have not received information about transaction ...
9
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3answers
3k views

How does the recent patched key image exploit work in practice?

For more info https://getmonero.org/2017/05/17/disclosure-of-a-major-bug-in-cryptonote-based-currencies.html This has been patched months ago and was never exploited which can be proven by running a ...
15
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2answers
2k views

What is Monero's mechanism for defending against a double-spend attack?

The title says it all, but I want to frame the issue two ways, in hopes of a slightly more in-depth answer. With Bitcoin, the blockchain is transparent. In the "ordinary course of business" in the ...
5
votes
1answer
259 views

How does RingCT prevent doublespend ?

For what I know about RingCT it use fake outputs to mask the amount that is transaction between address's, how do we know that the fakeoutputs are correct and that is noone messing with them?
8
votes
1answer
179 views

Is transaction malleability an issue with Monero?

Is transaction malleability an issue with Monero, like it is in Bitcoin? If so, is there an identified possibility to solve it? If it isn't an issue, what makes the difference?
8
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2answers
139 views

Calculating the cost of a double spending attack

A toll booth owner wants to accept zero confirmation transactions (because waiting for confirmation would lead to long lines at the toll booth) and open the gate as soon as the transaction (with ...