Questions tagged [block-hash]
26 questions
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Which block has the lowest hash?
Which block has the lowest hash currently? Is there a website that allows to sort blocks by hash?
MCCCS
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Is it possible for an unsolvable block to exist?
Is there a proof that the hashing will always yield a result? Or proof that there exist unsolvable blocks?
It's my understanding that even if we hit an unsolvable block that eventually the transactions in the block would change, so what's being…
Addy
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1 answer
Longest unconfirmed transaction?
I recently tried to make a transaction with coinbase. In a hurry I put no fee though. It's still unconfirmed and blockchain.info doesn't recognize my hash. But my btc qt wallet is debited. My question is what is the longest unconfirmed transaction…
dave
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2 answers
Why can't miners meet the difficulty by picking a low number for the block hash?
In terms of 'proof of work' my novice understanding is that miners are tying to come up with a 64-digit hexadecimal number, "hash," that is less than or equal to the target hash.
Can't miners always get lower than the target has by inputting "63…
jack
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2 answers
Difference between block hash and transaction hash in bitcoin-core
Is there a logic based on which one can determine if a given 32-bit hash corresponds to a transaction or a block without enquiring a bitcoin-client?
In other words, how do I differentiate or validate a given 32-bit hash as a transaction or block…
2
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Proof-of-Stake: How to ensure immutability of the blockchain?
In Proof-of-Work, a miner tries to solve PoW puzzle based on the hash of previous block, such that in case of changing block B_i, all blocks after that (blocks B_i+1, B_i+2, ...) are no longer valid since puzzle of every block has been solved based…
Questioner
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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 I know why the nonce needs to change, but I don't…
SimonSchuler
- 135
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1 answer
Chain with most proof of work - hash target or block header hash?
What is calculated towards the sum of PoW of the chain? Is it the target difficulty that has been met or is it the actual block header hash?
Say the target is 000000ABC00000000... and I mine block with hash 00000012300000000... - do I count…
Wapac
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vote
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Why are there ETH addresses in bitcoin wallet.dat?
So I have a lot of addresses or pkscript listed in my wallet.dat files that begin with 0014....all...numbers.
There is bitcoin address on the same line starting with a 3.
When I strip the 0014 and search the blockchain, they all bring up an ETH…
burchbit
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vote
1 answer
What would be the effect on the number of leading zeros hash generation if bitcoin increase its nonce size from 32 to 60 or 100 bits?
If Bitcoin increases its nonce size from 32 bits to double or triple the size, how will it affect the speed of getting the right hash with the required number of zeros?
Oluwaseyi Jaiyeoba
- 11
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2 answers
Trying to understand why hash value is more secure from hash algorithm
I am currently studying in college in the US and was actually curious about bitcoin and cryptocurrencies as a whole. I started looking on free university sites like Stanford university and New York University and even attempted to do questions of…
Crypt0bl0ckm0nz
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1 answer
Mining Theory: What would happen if a block hash collision occured?
To my knowledge, neither SHA256 or scrypt have ever had provable instances of hash collisions occur.. However, if this highly unlikely event was to happen, what would that mean for the state of the blockchain? Would it cause consensus confusion…
apt-getschwifty
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In the case the difficulty increases as much in future, will the possible hashes run out/be insecure?
As I understood, in the block hash, the amount of zero's is the nonce, like this:
0000000000000000005f54622d97866453137466737289c2500e67f6fce1cd4e
When there are more blocks found than in the average of 10 minutes, the nonce will increase. Then the…
ReneFroger
- 141
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1
vote
1 answer
merkle root 2 codes
While trying to calculate the merkle root in python from the data i got from the mining pool.... i found there are 2 different codes.
code 1:
def build_merkle_root(coinbase_hash_bin, merkle_branch):
merkle_root = coinbase_hash_bin
for h in…
Santan
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1 answer
Hash that defines previous block in Blockchain vs mathematical solution
Is the hash that defines the previous block (block A) in a new block (block B), the same as the hash the miner calculated to submit block A?
As far as I know, you need to find a nonce so that the hash of the entire block A starts with zeroes. If you…
Peter111
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