Questions tagged [blockchain]
The blockchain tag has no usage guidance.
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Can blockchain provide any meaningful benefit in more permissioned and less byzantine settings?
Consider as an example the following setting.
A set of universities want to keep track of the joint list of students. Ideally, each university will have a "consistent" copy of this list, ...
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How can we prove Karlin and Yao’s probability bound on randomized Byzantine Broadcast protocols?
Can we concretely prove that with 3 nodes (one of which is faulty), a randomized Byzantine broadcast protocol will have a 2/3 probability of success?
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Why is "Proof of Space" insufficient to secure a blockchain?
I just came across a blockchain concept called "Proof of Space-Time" in which participants compete to verify blocks by generating and storing essentially random data to answer essentially ...
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Simulating a multi-network environment in one device using Python
I am deploying a blockchain on a localhost where all nodes can communicate with each other using ports and APIs; however, a node/group of nodes can leave the main blockchain group.
Some questions came ...
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71 views
Books for learning Cryptocurrency
Please suggest a good for mathematical section of studying cryptocurrency.
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60 views
What is the difference between Proof of Elapsed Time (PoET) and Practical Byzantine Fault Tolerance (PBFT) algorithm?
I am interested in these two consensus algorithms in the blockchain: PoET and PBFT.
I saw this question about PBFT algorithm.
But, my questions are: what is the difference between PBFT and PoET ...
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1answer
93 views
How to generate, validate, and invalidate a set/list of numbers in O(1) time and space?
Imagine my server is generating "tokens" of some sort for a client on a regular basis. When a client asks for a token, the server responds with a new value (and any other supplemental ...
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1answer
29 views
What happens when the xor inBlock chaining returns false?
"With block cipher, each plaintext block is XOR-ed with the previous ciphertext block and then encrypted, this is known as block chaining. This prevents identical blocks of plaintext from producing ...
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1answer
20 views
BlockChain: Always get a new Hash
I am asking a simple question. Why we say that we would always get a new hash in a blockchain? Why we can't have collisions?
One way of collision is that the hard disk becomes full and there is no ...
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1answer
35 views
Guaranteed existence of a blocking set in the accept definition of Stellar
In the SCP, condition 2 of the accept definition allows a node to vote for one statement and later accept a contradictory one. Condition 2 assumes the existence of a v-blocking set which has not only ...
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1answer
100 views
Where were the ideas of vote, accept and commit phases originally introduced?
In the Stellar Consensus Protocol SCP, the voting procedure follows a 3 phase commit i.e. vote, accept and confirm i.e. see section 5.
Is this a novel introduction or has this been previously been ...
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71 views
A tree-like data structure with rights delegation for distributed computing
Every actor can create a root node and delegate a right to add a child node. Every node contains name of its’ creator or who added it, and value S. Sum of all values S at the same level of the tree ...
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23 views
Incentive for block creation in a private blockchain
Bitcoin miners are incentivized to produce valid blocks via a trasactional reward. But let's say I wanted to implement blockchain as part of my private data system. Who would my miner's be? I think ...
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What important/crucial real-world applications use blockchain?
As part of some blockchain-related research I am currently undertaking, the notion of using blockchains for a variety of real-world applications are thrown about loosely.
Therefore, I propose the ...
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45 views
Agreeing on a Time in a Trustless Network
Imagine a chord-like network $N$. each machine $m \in N$ is directly connected to $N_m \subset N$.
Without relying on official timeservers, I want all machines to synchronize to some time with ...
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129 views
How many number of nodes we can create under hyperledger fabric?
We are using hyperledger fabric. We have a doubt like, is there any limit, of creating number of nodes while configuring hyperledger fabric?
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1answer
2k views
Why are forks in the Blockchain eventually resolved?
I'm reading Wattenhofer's The Science of the Blockchain. On page 87, he states the following thoerem:
Theorem 7.22. Forks are eventually resolved and all nodes eventually agree on which is the ...
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1answer
2k views
What is the algorithm for Blockchain's Byzantine Fault Tolerance?
This person was asked: "Why is a blockchain implementation different than a distributed consensus system like Raft?"
In part of their answer they replied:
For one, Raft is not Byzantine fault ...
