Questions tagged [consensus]
Questions about the consensus system of Bitcoin and the protocol rules that are consensus critical.
159
questions
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What is “consensus”?
I’m really struggling to get my head around a particular piece of lingo in the bitcoin/blockchain space, and would really appreciate if someone was able to give a bit of clarity. I have been doing a ...
0
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0answers
17 views
The time when the miner get a new block [duplicate]
I am wondering the time when get a reward for new mined block.
Theoretically, miner will earn reward when they mine new block. but at that time, there is no way to verify that they really waste hash ...
1
vote
1answer
50 views
Consensius algorithm difference to PoW and BFT
I have a question on the consensus algorithms, in particular, what is the principal difference conceptual to the family algorithm od PoW(used to bitcoin) and BFT(used to Libra blockchain with the ...
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0answers
19 views
How to detect a consensus is BFT or not?
Can we divide consensus algorithms into BFT (Byzantine Fault
Tolerant) and non-BFT ?
If so, How to detect a consensus is BFT or non-BFT ?
Is there any non-BFT consensus algorithm example ?
0
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1answer
66 views
What is the difference between BFT and PBFT
What are the differences between BFT and PBFT?
I want to know the difference between these two concepts.
If there is any improvement in the BFT's limitations, let me know.
Please answer. Thank you.
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1answer
40 views
Do Full Nodes validate all transactions and make new blocks after all bitcoin are mined?
Do Full Nodes validate all transactions after all bitcoin are mined?
A fork of bitcoin core with all coins pre mined would be behaving in this way too I'd imagine..?
Also, would these nodes still ...
2
votes
1answer
71 views
How does the 51 percent or 2/3 majority voting rule work?
For a block to be added to the chain, it needs vote from majority of miners, is that correct? If yes, does that mean a single block gets worked upon by all of the miners?
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1answer
23 views
Proof-of-Stake: What if a bad enactor is chosen by random?
My understanding of proof-of-stake is the following:
The node that mines the next block is chosen, randomly in proportion to the amount of nodes they have in the network (ex. person who who owns 5% ...
0
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1answer
23 views
How do nodes come to consensus on whether a timestamp is valid?
From bitcoin wiki:
A timestamp is accepted as valid if it is greater than the median timestamp of previous 11 blocks, and less than the network-adjusted time + 2 hours.
If a miner submits a block ...
0
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0answers
24 views
PBFT vs. Proof-of-Authority?
based on this answer: https://bitcoin.stackexchange.com/a/79402/41513 :
PBFT (Practical Byzantine Fault Tolerance) is a voting based consensus
algorithm in which every node must send messages to ...
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1answer
51 views
What are the biggest Proof-of-Stake roadblocks? [closed]
What are the biggest hurdles (technological or otherwise) that the Proof-of-Stake consensus algorithm must overcome to become the de facto consensus algorithm for blockchain? Or put differently, what'...
0
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1answer
23 views
What is meant with 'the highest PoW'?
What is meant when the nodes select the chain with the highest cumulated PoW?
How is the highest highest PoW calculated? I thought the concept itself is called PoW.
4
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1answer
165 views
Activation of SegWit v1
The segregated witness soft fork of August 2017 included a versioning field which would allow for future incrementation. Anthony Towns has recently posted an early draft of the proposal for the SegWit ...
0
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1answer
34 views
Ripple: Validators
All the validators need to reach consensus in ripple.
Would it that mean that, the more validators there are, the slower the process results?
But the less validators there are, the more unsafe the ...
0
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2answers
38 views
Does a Node connect to all the peers?
Does a Node connect to all the peers in the network? Or just a few?
If its just a few, how many?
If its just a few, what about if all of those nodes in the list are malicious?
0
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1answer
16 views
Blockchain: How do nodes know what Data is correct from Consensus process?
How do nodes know what data is correct from consensus?
What about if two nodes execute two different consensus with 2 different Valid blocks with the same height at the same time, can that happen?
...
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1answer
23 views
as a individual miner's side, how UASF, UAHF agree or disagree is occurred?
UASF is timestamp-based method. after that time, new rules will start. but i have a few question about this. how this rules is accepted by USER?
does miner program contains 'yes' or 'no' about this ...
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0answers
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Does everything of a Blockchain Network rely on its underlying “Consensus Protocol”?
I have been reading about and researching on Blockchain Technology for quite a while now, and what I can comprehend from the very primitive architecture of these "Distributed Databases" is that ...
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0answers
20 views
How is the fault tolerance measured?
“If the number of nodes that agree exceeds 2/3, the blocks or transactions of clients will be accepted”
Practical Byzantine fault tolerance (pBFT) : (n - 1) / 3
I read those 2 things in a PDF that a ...
0
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0answers
16 views
Byzantine Fault Tolerant - what a benefit? [duplicate]
According to wiki, if we had m generals, than we need 2m+1 to meet consensus.
So it's about 66.6% + 1 generals
But what the reason to use consensus like BFT?
Why we can't get result of the most (50%...
0
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0answers
19 views
Private Blockchains: Blocks’ validation
I’m a software developer and I’m trying to understand blockchain at a code level
I have the following issue:
There’s a private blockchain, this private blockchain does not have any relation to ...
0
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1answer
35 views
Private Blockchains: Validation
I'm a software developer, and I have some questions about private blockchains, I'd like to have technical answers since I'm trying to understand blockchain at a code level. I'm going to write a ...
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2answers
54 views
Proof for “Is an immutable, decentralized blockchain possible without economical incentives?”
Bitcoin is immutable because of economical incentives. Those who are able to 51% the network can't do it, because it'll result in the value of the currency to drop tremendously, which causes waste of ...
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1answer
25 views
Bitcoin Pluggable Consensus with Algorand? [closed]
Algorand is an extremely promising consensus protocol -- Could Bitcoin be configured to use Algorand?
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1answer
47 views
On blockchain scalability bottleneck
It is often said that the major bottleneck of blockchain scalability is that every (honest) node has to process every (valid) transactions. But the progress of a blockchain is how fast it reaches ...
5
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0answers
140 views
Did the introduction of VerifyScript cause a backwards incompatible change to consensus?
My question is about the changes to bitcoin done by commit range [a75560d8, 6ff5f718], and their effect on consensus.
Out of this range of four commits (all attributed to satoshi) during the dates ...
0
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0answers
39 views
Why is PoW 51% attack resistant?
I was trying to understand why PoW makes the blockchain 51% attack resistant. From my understanding, we can think of PoW as a way to assign a leader who would decide what the next block is. I can see ...
1
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0answers
50 views
What is the best way to test new consensus protocol?
I wanted to test a new consensus protocol. However, the bitcoin core is a large codebase (>100k lines). Is there any small codebase which is designed to test new consensus protocols and includes only ...
1
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0answers
45 views
Why Spectre has a “weak” liveness?
According to this article: (https://medium.com/@avivzohar/the-spectre-protocol-7dbbebb707b5) written by one of Spectre's author (Aviv Zohar), it is mentioned that Spectre has weak liveness.
What is ...
2
votes
2answers
287 views
Exact definition of “Liveness” and “Safety” properties in a consensus?
Two main properties of a consensus are "Liveness" and "Safety".
What are the exact and precised definition of "Liveness" and "Safety" properties in a consensus ?
Are the following definitions ...
0
votes
1answer
54 views
Is there a max number of tx outputs allowed by consensus? [duplicate]
It seems good for preventing an UTXO bloat by restricting max number of outputs of TX(or block) can have.
Is there such a restriction? if there is, which part of source code should I read? If not, why ...
1
vote
1answer
33 views
Does the BFT solution from lamport guarantee liveness?
Solution: https://people.eecs.berkeley.edu/~luca/cs174/byzantine.pdf
Although there is a lot of material about this, I am still not sure what the answer is. I found two different statements:
Yes, it ...
1
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1answer
55 views
Bitcoin economic nodes, concensus, and historical nodes
With regards to the recent dos + inflation bug, and seeing that most nodes on the network have still not upgraded with the patch (lukedashjr's chart here: https://luke.dashjr.org/programs/bitcoin/...
2
votes
1answer
181 views
Byzantine Fault Tolerance Threshold of Bitcoin: 1/2 or 1/3? (Edited)
According to this answer: https://bitcoin.stackexchange.com/a/58908/41513 a Byzantine Fault Tolerant (BFT) consensus threshold is 1/3.
On the other hand, there is a common belief that Bitcoin network ...
1
vote
2answers
71 views
Do miners become temporary dictators of blocks they mined?
This is something I've read here: https://blockgeeks.com/guides/bitcoin-forks-guide/
"When a group of miners discovers and mine a new block, they become temporary dictators of that block"
Can anyone ...
5
votes
2answers
291 views
Why didn't Bitcoin implement segwit in the first place?
Why didn't Bitcoin implement segwit in the first place?
Why and how does non-segwit Bitcoin enable a miner to change a transaction's txid?
From Mastering Bitcoin ch. 7 § "Transaction identifiers":
...
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3answers
234 views
Game Theory in Blockchain?
The blockchain consensus seems to be very related to the Game Theory, when each participant tries to achieve their "favorites", where defining "what favorites means" is not very easy, since a ...
0
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1answer
81 views
Tendermint consensus: Are validators “known” and “pre-selected”?
What are similarities and differences between Tendermint consensus and Proof-of-Stak?
For example, in both consensus, a validator is selected randomly (I think in Tendermint consensus they are ...
1
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1answer
26 views
Bitcoin version conundrum
Given that the Bitcoin node software not centrally controlled (auto updated) and many different versions and implementations exist around the world, how would a core change be possible if it is not ...
1
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1answer
213 views
Is PBFT a consensus algorithm?
Can we consider PBFT (Practical Byzantine Fault Tolerance) as a consensus algorithm ?
And if yes, How does it work?
And is it similar to other consensuses such as PoW, PoS or PoA ? Or it is totally ...
1
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1answer
195 views
Is “Proof-of-work” a subset of “Byzantine fault tolerance (BFT)”?
Can we say that Proof-of-work is a type of Byzantine fault tolerance (BFT) ? In other words, is PoW a subset of BFT ? Or they are two different categories?
Please note that there is a similar ...
0
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1answer
57 views
Consensus roles for op_return
What is the validation rule, not policy, for op_return? What is the maximum length of the data that can be attached? Is it 514 bytes? As if the maximum script size was 520 bytes -1 byte for the ...
1
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1answer
112 views
How to select a leader in RAFT consensus protocol [closed]
Suppose a network of 5 nodes uses RAFT consensus protocol. Each nodes maintains a transactions log which consists of a list of the log entries. Each log entry again consists of index and term. All of ...
1
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1answer
116 views
the maximum possible entries a network can accept in RAFT consensus?
Suppose a network of 5 nodes uses RAFT consensus protocol. Each nodes maintains a transactions log which consist of list of log entries. Each log entry again consist of index, term and command. The ...
0
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1answer
27 views
How is the amount of proof-of-work invested in a chain calculated?
The bitcoin whitepaper (page 3) states
The majority
decision is represented by the longest chain, which has the greatest proof-of-work effort invested
in it.
I could not find how exactly this ...
1
vote
1answer
70 views
Delegated Proof of Stake (DPOS) vs. Proof of stake?
What is the main difference between Delegated Proof of Stake (DPOS) vs. Proof of Stake? Is there any significant advantage for security? (since PoS in general suffers security problems.) And which ...
1
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2answers
156 views
Do private blockchains need consensus protocols?
My understanding is that in a private blockchain, the participating nodes verify and agree that the block is valid and only then add it to the blockchain.In this scenario, are consensus protocols (...
9
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3answers
825 views
How is Bitcoin governed by mathematics?
I keep hearing talks from Bitcoin evangelists that claim Bitcoin isn't governed by any central authority, rather it's governed by mathematics.
What exactly do they mean when they say "governed by ...
2
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1answer
89 views
What is the “main” difference between consensus mechanism of Bitcoin and Ethereum?
Bitcoin and Ethereum both use proof-of-work (PoW) consensus mechanism. One of differences between Bitcoin Pow and Ethereum PoW is difficulty level, meaning that while in bitcoin block generation rate ...
0
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2answers
112 views
Is it logical to use “Proof-of-Authority” for a “public” blockchain?
According parity.io website:
Proof-of-Authority is a replacement for Proof-of-Work, which can be
used for private chain setups.
And also:
The chain has to be signed off by the majority of ...
