Questions tagged [majority-attack]

A majority attack, or 51% attack, is an attempt at solo-mining a longer chain to outpace the main chain.

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Minority Attack on Bitcoins

I read the first paper which described the bitcoins. Most of it is clear except for one thing. I tried to find solutions online but couldn't find it. I am completely aware of the implications of a ...
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Can a 51% attacker earn mining rewards on the blocks they tampered with?

This article gives an example of a 51% attack in theory as: In a 51% attack the hacker will typically mine in private to attain a longer chain than the publicly seen chain in hopes of double-spending ...
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Why can a 51% attacker not change the block reward?

It is said that in the case of an attacker having a sustained 51% power, the attack still cannot change the block reward. Why? My naive understanding is that, since consensus is controlled by the ...
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Miners forego revenue in order to 51% attack the Bitcoin protocol by rejecting blocks

I was recently listening to Mike Green and Anthony Pompliano debate the future of Bitcoin on RealVision. And Mike raised an interesting point regarding Bitcoin (I'm paraphrasing). "Scenario: Let'...
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Do you really need more than 50% mining power in order to attack Bitcoin blockchain?

My question is about concept, so code is not related, however, do you really need 51% of the mining power in order to attack/replace the real bitcoin Blockchain? For example, a blockchain has a ...
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What do we mean by honest nodes?

In his recent paper, Vitalik often mentions the term "honest nodes". What do we mean by that exactly?
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Two threats to Bitcoin: Quantum Computing and Mining farm seizures - what new BIPs are needed before it is too late? [closed]

How resistant is bitcoin blockchain against physical attacks? Contrary to other consensus mechanisms, Bitcoin's PoW model is dependent on massive Mining Farms with tons of ASIIC hardware. These farms ...
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Incentive for miners to keep mining once reward get very low [duplicate]

Currently each winning miner receive 12.5 bitcoin or 12.5*10 000 dollar per successfully mined block and the amount of bitcoin receive is divided by 2 approximately each 4 years. The incentive to ...
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What are some potential scenarios that a state actor can harm bitcoin if they control more than 51% of the hashing power?

As reported recently, China controls more than 51% of the hashing power and just in one province in China controls 54%. Assuming China has bad intentions and forces all these mining operators to ...
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Is the 51% attack the only technical reason no country will adopt Bitcoin as a state currency? [closed]

Is the 51% attack the only technical reason no country will adopt Bitcoin as a state currency? Lets suppose a country with GDP size less than 300 Billion USD adopt the Bitcoin as an official currency. ...
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Robustness of bitcoin

I am wondering about the consequences of a potential 51% CPU attack on the bitcoin blockchain. Imagine that a state invests enough computational power to rewrite from scratch an entire blockchain, ...
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51% attack on New coins

I have experienced 51% attack after launching a new altcoin last month. While i mined only 100 blocks using coin-cli generate 1, i noticed somebody already mined 2000 blocks within minutes attacking ...
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Does a 51% attack depend upon difficulty?

Does increasing difficulty also serve to decrease the probability of a 51% attack? It seems that since difficulty is the same for all, this is not the case. Is that correct? If difficulty were ...
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Can collective mining pools refuse to recognize a mining block mined by a specific miner?

This is a continuation to the question: Can a bitcoin transaction from a specific bitcoin address be banned? (via mining pools). Suppose Satoshi Nakamoto sends bitcoins from one address to another, ...
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What are the chances bitcoin big mining pools to unite and do 51% attack?

Looking at this bitcoin hash rate distribution chart (https://www.blockchain.com/en/pools), it only takes 3-4 mining pools to unite and do a 51% attack. With this possibility, how can people still ...
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51% attack + ignore blocks not mined by yourself [duplicate]

If you own 51% of the mining power and decide to ignore all blocks not mined by yourself. You would eventually end up having the longest chain, and would eat up the 49% of block-reward you werent ...
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Are smalltime block chains susceptible to brute force liars?

My understanding is that the integrity of the bitcoin block chain is dependent on the consensus of the masses - that no single actor can write entries at will unless they. controlled over 50% of the ...
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Are Bitcoin and Ethereum really de-centralized? Or is federated a better term?

By looking at the bitcoin and ethereum mining pool hashrate distribution I feel that only 5-10 relevant full nodes exist. So it's more like a federated system among those. Am I seeing something wrong ...
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What happens if an ISP isolates a portion of nodes?

I came to believe that an ISP can easily detect full nodes, BTC connections and isolate them from reaching any other nodes. When and if an ISP decided to do so, could they easily perform a 51% attack ...
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What is the actual threat of a majority attack on the Bitcoin blockchain? [duplicate]

As far as I understand, an attacker (in the role of a malicious miner) controlling a large portion of the current hash power could replace previously accepted blocks with alternatives. But, what does ...
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What prevents a majority attack from undoing transactions of others?

From the Wiki: If the attacker has the majority of computer power, "the attacker can't reverse other people's transactions without their cooperation." I don't quite understand why this must be the ...
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How much money would it take to bribe the majority of miners to attack the system?

I think this question is just a re-formulation of the 51% attack, but it has me thinking: miners are monetarily incentivized to not perform a 51% attack, but there must be some amount of money will ...
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Understanding reinvestment in a miner growth scenario

I got the following question which I can't figure out: Alice, Bob, Carol, David and Eve are the five major bitcoin miners. They have each invested a million dollars in specialized equipment for ...
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What concerns arise from the heavy miner concentration in China? [duplicate]

As per an Business Insider article last year, approximately 73% of the hash power comes from China. Over 50% just by the top 3. If coordinated, they could cause havoc. Is that a concern to anyone?
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What are “automatic coin choice pools”?

Referenced in this thread about a 51% attack on feathercoin. This would have been a hell of a lot worse without automatic coin choice pools. They routed a ton of hashpower at FTC. This broke the ...
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How much hash power exists in redundant mining hardware?

I'm trying to understand the feasibilty of a hostile nation-state performing a double spend attack on bitcoin. Assuming mining profitability is not a concern, I wonder if they could buy or borrow ...
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Pissing Attack / adversarial blocks attack

How do the ones of you familiar with the protocol and game theory suggest dealing with potential 'empty block attacks' (a majority of miners collaborate to slow down Bitcoin transactions by producing ...
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Can the 51% attack be made to become 81% attack or 91% attack?

Since the 51% attack happens if there are more than 50% of nodes that fake the data on the blockchain, can it be actually 81% or 91% that is needed to fake the data, because it would be much harder if ...
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the client's 'invalidateblock' debugging command - possible prevention against majority attack?

there is a 'invalidateblock' debugging command in the btc client. How can this command be used in a situation of majority attack threat and play a part of countering the attack? I understand that ...
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Bitcoin 51% majority miner attack - question on the role of user activated soft forks as defense tactic

If one mining entity has alone 52% hash power of the overall network, then this party can block transactions for example and try to "build" up a forked, longer chain while time passes, right?. As I ...
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Is 10K full nodes enough to bitcoin to avoid 51% attack?

As I know bitcoin has about 10K full nodes. And the question is in my mind is that: This number is not huge! If someone has 6K servers, Can control the bitcoin via 51% attack? I was thinking if ...
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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 ...
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142 views

Do multiple miners contribute to mining the same block even if they are not in the same pool

Assuming that this is reliable, according to an article on investopedia on the 51 percent attack: 51% attack refers to an attack on a blockchain – usually bitcoin's, for which such an attack is ...
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Is it more dangerous when 51% attack happens than just having a pool with >50% hashrate?

Many people told me that, if a mining pool performs a 51% attack, the price of the coin will drop. But I disagree. There are pools with >50% hash power already for a long time. Flypool is an example....
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Does the software to conduct a 51% attack exist?

I know that it would cost hundreds of millions of dollars to do a 51% attack on Bitcoin, but if somebody did that, bought the hardware, etc could Bitcoin Core or any other software be easily ...
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What will happen on creating a transaction with negative amount?

Bitcoin in short is a public ledger guided by consensus of its nodes. In theory, if there is no validation of transaction amount, if we were to create a transaction with negative amount, that would ...
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107 views

51% attack inevitable [closed]

I think the assumption of a 51% attack is not worth the effort is wrong. Eventually the price of Bitcoin will stabilize. Let’s say at 1 million USD then a diminishing block reward and the transaction ...
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If there are 20 nodes in network and all are receiving transaction and after 10 min

Question 1) If there are 20 nodes in network and all are receiving transaction and after 10 min all will pick transaction from their transaction pool and start creating block, now will all nodes will ...
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How to do a 51% attack on my own altcoin [closed]

recently I have been curious about 51% attacks so I created a fork of litecoin and want to do a 51% attack on the coin but don't know how to. please can you tell me how to do it. Thanks,
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Other people mining my coin without my permission, how to avoid this? [closed]

I have created an altcoin and i wanted to solo mine all coins myself. I disabled generate function in wallet, hidden the source code as private in github. I run one main node and i mine in my laptop. ...
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Is possible to control the network? [duplicate]

Can anyone with enough computing power, take over the network ? This is following from a previous comment where I was asking : ... how can that be possible (to control the network) if mining tend ...

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