All Questions
Tagged with cryptography hash
17 questions
1
vote
1
answer
55
views
What is one word seed word exactly?
I have the following code
import hashlib
import binascii
def word_to_private_key(word):
sha256_hash = hashlib.sha256(word.encode()).digest()
private_key = binascii.hexlify(sha256_hash).decode(...
- 111
1
vote
0
answers
107
views
What needs to be changed in Bitcoin if SHA-256 is broken? [duplicate]
I come up with a little bit "catastrophical“ question. I declare that I understand the degree of improbability of such a scenario in our lifetime, but I would still be interested in your opinion. ...
- 11
-1
votes
2
answers
94
views
How Bitcoin restricts the mining time?
How Bitcoin restricts the mining time?
We know cryptocurrency systems restrict the mining time of a block to a certain limit for security reasons. For example, mining time for Bitcoin is ~10 minutes. ...
1
vote
1
answer
555
views
How many bits of entropy is a Bitcoin address?
I've seen references to 160 bits of entropy, but I'm not sure if this is universal or just applies to the old address format.
- 265
1
vote
1
answer
570
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How specific are ASIC's design? Can they single hash SHA256?
I understand that Bitcoin's ASICs are a highly optimized piece of equipment and, therefore, are also very specific.
My question: are they able to do a single (or triple?) SHA-256 hash at all? And, ...
0
votes
2
answers
101
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I am just wondering what are the methods which can hide all the transactions and also able to validate transactions in an block chain?
I am new to block chain and was looking at how block chain work mainly proof of stake based . They check validity by going through all the transactions which is something concerning as everyone can ...
0
votes
1
answer
88
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Can Bitcoin Tech be Used to Protect Journalists [closed]
Over eight Nigerian journalists are currently in police detention because they published investigative news stories that didn't sit well with the government of the day.
How can the bitcoin ...
0
votes
1
answer
38
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Have all hashes of unlocked difficulty levels of cryptocurrencies been mined?
I'm wondering if all the hashes of a previously unlocked difficulty level of a cryptocurrency, such as
0000000000000000xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx BTC
, have been completely ...
- 101
2
votes
3
answers
11k
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Why is it impossible to modify a transaction in the blockchain?
Many pages (including Wikipedia) say that it is impossible to modify a transaction which is already in the blockchain included.
But why is it so difficult?
- 205
3
votes
2
answers
637
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Verifying that a transaction is in the blockchain
Let me first start off by saying im just learning about blockchain and the technical aspects.
From my understanding, each transaction is cryptographically hashed, the hashes are paired and hashed ...
- 31
0
votes
1
answer
49
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is it possible to replace the cryptography and public key algorithms in Bitcoin?
Is it possible to replace the cryptographic algorithms used in Bitcoin, such as the hash algorithms and the elliptic curve public key cryptography?
Does this require a soft fork or a hard fork?
- 117
1
vote
1
answer
333
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Proving collisions on Bitcoin addresses without discovery of the private key?
If there is a private key that leads to a collision on an address, it is possible to show that the private key is not the one used previously, even though they have a collision on the address?
...
- 287
3
votes
2
answers
1k
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Are Bitcoin Block Hashes Predictable
to create the block chain, the Bitcoin network runs hashing algorithms for each block, is it mathematically possible to predict the hash value of say, the 100th block from the last block currently in ...
- 33
1
vote
1
answer
601
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Are transactions still tamper-proof if blocks are hashed without nonces?
If an alt were to forgo difficulty and timed release of new supply by removing the nonce from blocks therefore the whole difficulty/target system, is hashing without nonces still providing the same ...
user5107
1
vote
1
answer
457
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Why are blocks hashed?
Am I correct that addresses are hashed to compress a huge text-represented coprime into something of manageable size?
Am I also correct that transactions are hashed for the same reason and also ...
user5107
9
votes
1
answer
4k
views
What complexity class is Bitcoin's proof-of-work (hashcash) in?
To formulate this question precisely, I will define an idealized hypothetical "perfect" hash function H(n) which has nice scalability properties, and will formulate a problem PERFECT HASHCASH in terms ...
- 272
13
votes
3
answers
3k
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Can the Bitcoin network be used for cracking?
I'm assuming that the Bitcoin economy is rapidly building a computing cluster capable of unprecedented amount of hash searching.
Would it be possible for an attacker to leverage this to crack other ...
- 274