Questions tagged [nonce]
should be used for questions related to the nonce used in bitcoin block
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How do nonce and difficulty relate?
Good morning,
I'm reading about Blockchain technology but I have a couple of questions about the nonce that I cannot find the answers for. I'm hoping someone here will be able to answer them.
i) ...
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Process for finding nonce
Assume we have a transaction in hex (tx_hex) and we want to find a nonce such that
SHA-256(SHA-256(nonce|| tx_hex)) = new_transaction_id ('||' denotes concatenation)
first bits consist of 32 zeros. ...
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Does every nonce really have an equal chance of winning?
I set out to test the claim: "Every nonce has an equal chance of winning."
Time Evolution
So, I plotted, with gnuplot, the nonce values vs. hashes for all the valid blocks in the blockchain:(Also, ...
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Discrepancy Between Nonce for Single Block
I'm looking at nonce data from blockchain.info for block #1 ( https://blockchain.info/block/00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048 ) and it shows a nonce value of 2573394689 ...
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Why is the nonce bruteforced from 0 to n while mining?
bitcoin noob here.
I was wondering why is the nonce increased from 0 to n while searching for a blockhash?
Why not start at some other integer > 0 for example?
My background is in ethereum-dev, so ...
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What is the largest golden nonce found?
With all the stats and metrics out there I was surprised I could not find this out. Has anyone ever determined the highest nonce in a block?
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Why is it important that the hash algorithm is puzzle friendly?
I don't understand "PUZZLE FRIENDLY". Here the definition I read:
A hash function h is puzzle friendly if for every possible N-bit
output value y, if K is chosen from a distribution with high ...
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Why check for multiple nonces despite finding a golden nonce?
I'm still new at trying to understand the entire idea surrounding the mining process.
I read the following:
When mining, you are given a set of data to perform hashes on. As you
noted, this is done ...
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How do I compute a private key, if I have two messages signed using the same nonce? [duplicate]
If I sign two messages with the same private key and nonce, it compromises security, making it possible to calculate the private key.
I'm implementing a system (outside of bitcoin) where a message, ...
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How nonce and diffuculty work?
I struggle to understand one concept behind mining. It would be really great if someone could clarify some things.
This is an extract from blockgeeks:
From a technical point of view, mining process ...
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What is the Coin Base Text of a bitcoin block?
On the site https://coin.dance/blocks#blockDetails, there is a column Coin Base Text with values like Mined by AntPoolk9 Z4,b or *3Zc/BTC.COM/mm.jn~OoBրn*e*@ for example. What does it mean? Is it ...
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Understanding the Hash Function
Can someone please explain in detail the components of the final hash that determines the winner of the block?
My understanding is that the miners are taking
The Merkle Root,
The time stamp,
The ...
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What if is there is no solution to a block?
Please let me know if I understand something wrong.
Let's say I want to create a new block and verify previous transactions. To do this, I need to:
Choose which transactions I want to include in my ...
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Get input address using VIN txid?
I have written following script to get Vin address from Vin txids.
#!/usr/bin/python
# -*- coding: utf-8 -*-
import requests,json
url="http://asd:asdf@localhost:2332"
payload={}
payload = {"jsonrpc":...
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Where is the extraNonce in this coinbase transaction here?
https://blockchain.info/tx/c1669dabe1bcadf50c4b712e42da7b3d3152aef53752731b04a4f585dde6f5f2
The coinbase states this:
...
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nTime rolling is just an optimization for large/fast pools, correct?
Need to confirm my understanding of nTime rolling...
It's used to give the miner more options to mine without needing to request more work from the pool, by incrementing the timestamp. However, given ...
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Steal proof-of-work answer from a miner [duplicate]
Is it possible to steal proof-of-work answer from a miner who has insecure machine? Consider a miner who has insecure machine found correct answer of proof-of-work and an adversary steals this it and ...
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Who decides what the next, correct Nonce is?
As I understand finding the correct Nonce is the basis when hashing transactions for Proof of Work.
How and where is this decided in the ecosystem what the next Nonce is?
In my limited understanding ...
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How is the ExtraNonce calculated in Bitcoin Core
The Extra nonce for the genesis block in bitcoin core is 0x010445, how was this value calculated?
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Bitcoin (and other crypto-coins) nonce loop
I recently started to pay attention to what's going on at crypto-markets and, being developer for a long time, decided to take a look at the software we have out there in public access.
So I have a ...
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Guessing nonce - nonce pools/domains [duplicate]
Blockchain miners calculate the hash of (block data + nonce value). They actually guess (are looking for) nonce in order to get hash staring with a defined number zeroes. (The number of required ...
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When do miners stop waiting for new transactions?
I know my question might sound familiar to the question as follow:
When does a miner decide to stop collecting transactions and start calculating hashes to try to win?
But actually, the reply marked ...
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What happens if everyone discovers much faster way of solving hash function problem (mining)?
The question is not about how bitcoin mining works, but rather how bitcoin system adapts to progress in ability to tackle proof-of-work problems.
Suppose that proof-of-work problems used for bitcoin ...
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What is the relationship between hash rate and accepted shares?
Specifically this question is about Litecoin, but I suspect the answer would apply to both.
Say you have a rig mining at 700Kh/s (LTC). It seems that you get, more or less, a one or a few accepted ...
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How does a miner know which nonce to start with ?
Pretty straightforward question :
When a miner is trying to find a 18-leading-zeros hash, does it always start with a nonce at zero ? I suppose it doesn't, because other miners in the world may have ...
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Looking for nonces of even numbers
Each one of bitcoin and its derived crypto-currencies has a nonce value in the block, no matter what the algorithm is. Every miner tries to search for a luck nonce which can make the hash value ...
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How finding a working nonce says anyting about the validity of an initial transaction
I am by no means an expert, nor a cryptographer, but I would be interested in knowning a little bit more than what happens at the end of the following chain of events.
What happens at the end of the ...
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What value should nonce be when mining bitcoin ?
When the miner program start, the value of nonce is zero or a random number? Which of them is better?
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Is the nonce in Bitcoin the answer to the puzzle from the previous block?
If, in Bitcoin, the nonce is included in the header of the proposed block, is it the answer to the puzzle from the previous block?
MG2
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Mining Process - Transactions Selection
I started reading about Bitcoin a few weeks ago. Reading most the information and watching videos on the web, I though I understood about the mining process. However, I was shocked when I realized ...
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What's an example of an ExtraNonce2 value that would be considered invalid?
I've been learning about mining as part of a pool and using the Stratum protocol to submit completed work back to a pool -- https://en.bitcoin.it/wiki/Stratum_mining_protocol . There is this ...
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Why change the nonce instead of just rehashing?
Why do miners increase the nonce to compute a block hash rather than just generating a random block hash? It seems to me that both approaches would have the same likeliness of finding a result that ...
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How is the extra nonce formatted?
I'm trying to understand how a block is put together. From here, I know that the extra nonce used to be in the format:
pblock->vtx[0].vin[0].scriptSig = CScript() << pblock->nTime <&...
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Given a block, is there a list of all hashes for all possible 2^32 nonce values?
I am working in a computational research lab, and we're taking a look at Bitcoin. I'm trying to develop a simulation of Bitcoin mining for a nonexistent computer architecture.
I want to simulate the ...
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What prevents a miner from faking nonce hash
What exactly prevents a miner from presenting a random nonce hash of the block with enough zeroes at the start to get chosen?
How is the new hash verified by the other nodes? Since as I understand ...
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Finding nonce resulting in more zeros than the target
This might be a wrong question(I am new to understanding bitcoin details). But I want to ask this:
What happens if one node finds nonce value that results in way more leading zeros than expected by ...
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Can two different nonces and different blocks produce the same hash?
Say, I want to erase the record of a transaction by changing a block. Can I go back to that block and find a new block and nonce combination that makes the same hash?
Is it a case that finding such ...
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Reason behind hashing the nonce in prevBlockHash?
I understand the role that the nonce plays in the block header for calculating a hash for a valid proof of work.
But what I ask is: Do we consider the nonce in the prevBlockHash calculation of the ...
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How is the mempool incorporated in the calculation of the block hash?
So I've been reading about how the nonce is calculated. There is one part that I don't get. So there is a mempool, and each node (or mining node) takes a part (or the whole part) of that mempool, ...
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bitcoin's PoW, real time of creating one block
i learn that bitcoin is created every 10 minutes and if block is created faster than 10 minutes, Difficulty will increase.
and study deeper, mining process is finding nonce that start 0 to increase 1 ...
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Maximum # of hashes for finding a block?
Since nonce is a 32 bit number, the maximum value of nonce can only be 4,294,967,296. So, if a miner doesn't find the target hash within this number, what happens?
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Where is the nonce incremented in Bitcoin source code?
Where is the nonce incremented in Bitcoin source code?
I found where the extra nonce is incremented, but not the regular nonce?
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Explain this comment on nNonce from the bitcoin miner.cpp source?
This comment is in the 0.9.3 miner.cpp bitcoin source, right above the ScanHash_CryptoPP definition.
//
// ScanHash scans nonces looking for a hash with at least some zero bits.
// It operates on ...
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Can "Digital Signature of the Block by the Miner" be used in place of "Nonce"?
As it is understood that arriving nonce is very resource intensive, whether "Digital Signature of the Block by the Miner" can be considered in place of "Nonce"? Its Shortcomings, if not suitable.
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Are blocks sent only after finding nonce?
One of the concerns with increasing the block size is that it may get orphaned more often due to network latency in sending the big block. Why can't miners send the block without the nonce as soon as ...
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Has the nonce used in mining been sized?
In the mining process, everytime a block has to be confirmed, a certain hash with an incremental nonce is generated: If the nonce is a 32 bit number it can assume a value between 0 and 2^32 - 1. It ...
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What values are hashed in the SHA-256 algorithm, and what would be the next iteration until a possible header is found?
I've been doing a lot of reading on mining and software related to mining but I can't quite get my head wrapped around the specific nature of what is being hashed together. So far I feel like the ...
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Does the nonce have to be a number?
Since we're just trying to produce a specific hash output, couldn't the nonce also include letters or otherwise random bits?
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Determining a Block's Extranonce Value
How do I determine a block's extranonce value? I know they are in the coinbase transaction, but where? How do I decode the part that is the extranonce?
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How cooperative or competitive is the mining process?
As each miner works out which nonces it has tried, does it notify the network so that energy isn't wasted on re-processing the same thing by each node? Or is it totally competitive with everyone for ...
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