Questions tagged [blockchain]

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Books for learning Cryptocurrency

Please suggest a good for mathematical section of studying cryptocurrency.
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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
52 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 information it ...
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1answer
20 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
19 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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Miner violation in Securify Tool: Transaction Ordering Vulnerability Detection

For the following paper, I can’t understand the text written below: Securify Research Paper Our violation pattern checks that the amount of the call instruction is determined by a value read from the ...
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1answer
26 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
86 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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70 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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1answer
21 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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14k views

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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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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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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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
1k 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 ...