All Questions
Tagged with majority-attack doublespend
14 questions
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Noob question: Why is there not a limit of the number of blocks in a chain revision?
I have a noob idea and I want to understand where I'm going wrong :)
Say nodes agreed on a block revision limit, say, 6. This would mean that if they see an incoming chain that is longer than the ...
- 15
1
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1
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104
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How does longest chain propagation take place in bitcoin?
Let's say the valid blockchain that Node A has is: B1->B2->B3
Now, I am gonna cheat since I have lots of computing power. What I do is I download the above blockchain that Node A has and start ...
- 421
1
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1
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85
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double spend attack: Is this actually true for the more time progress the higher the probability of success for attacker
I'm new here.
I have a question here. Some experts keep saying that this assumption isn't formally correct and I don't really understand why or why they might be wrong.
In the double spend attack; ...
- 41
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1
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Is a 51% attack on bitcoin likely?
Given that the majority of bitcoin processing is done in China (source: https://bitcoinmagazine.com/articles/report-links-74-bitcoin-mining-china-sees-threat-network/), is it possible for a single ...
- 3
2
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1
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219
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Is "fee higher than block reward" attack possible?
Imagine the following scenario:
I send you 1000 BTC.
After 6 confirmations, you give me what I bought.
I create another transaction with 900 BTC to my own wallet and 100 BTC as transaction fee, using ...
- 144
3
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3
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124
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What incentive is there for a miner to not cancel his own 'real' txs
It is said that a Bitcoin miner attacker with enough CPU power to outrun the entire network is better off mining honest bitcoins - which is not correct since by creating a false block chain the ...
- 131
2
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1
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424
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Can a malicious majority miner rewrite history?
Is it the case that a malicious miner with the majority of hash power (say, 99%) can perform a double-spending attack by rewriting history?
If so, I can't understand how. If not, under what ...
- 813
1
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Where is coinbase transaction after a hacker successfully performs >50% attack?
Here is the scenario:
Honest nodes build one block from Block_1.
Hacker nodes privately build four blocks from Block_1 and broadcast these malicious blocks.
Now, where is the honest node's ...
- 633
6
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3
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723
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Why doesn't bitcoin place additional constraints on competing block chain forks, other than length of chain? (e.g., time and confirmation count)
In Bitcoin's proof-of-work system, consensus on which chain of blocks should be considered the "true" block chain is based only(?) on which chain is longer.
Accordingly, to quote a nicely written ...
- 337
4
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1
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808
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How does CryptoNote prevent a 51% attack and double-spending?
How does CryptoNote prevent a 51% attack and double-spending?
I’m interested to know what is the mechanism that protects CryptoNote coins from 51% and double-spending attacks.
- 41
1
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Can a double spend attack be obfuscated by mimicking the transactions seen before the fork?
An attacker controls the majority of the hashing power and wants to double spend without arousing suspicion. If they mirror the public chain's activity while generating the private fork and the fork ...
- 31
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2
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3k
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What is the Ripple equivalent of the "51% attack?"
In Bitcoin, if a participant gains control of more than 50% of the hash power, they can execute a double-spending attack. The "attack" could come from within, say if the existing powerful miners ...
- 2,022
9
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7
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3k
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Is performing a 51% attack / double spend on Bitcoin illegal?
Suppose I had an ultra large ASIC from the future, and could perform a double spend on the core Bitcoin network. At this point in Bitcoin's development, it is no longer a game - there's real money ...
- 26.6k
6
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351
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Is there any software available for testing of Bitcoin security?
I'm currently in the process of working on my thesis about Bitcoin security and I'm wondering if there's any software available for testing of Bitcoin security? For example, are there any programs ...
- 43.2k