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Questions tagged [hash]

This tag should be used for questions related to hashes. A hash is the output of a hash function, a function which .is a mathematically reproducible but irreversible process that takes in an arbitrary length input and produces a fixed length output. The same input will always result in the same output. Hashing is central to Bitcoin mining as well as the generation of Bitcoin addresses.

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Why is HMAC-SHA512 used on root the root seed to create master private key and chain code in HD wallets?

The process is depicted in this picture. Specifically, given that the root seed was derived using PBKDF2 (with 2048 rounds of hashing with HMAC-SHA256 already), why do we undergo an additional pass of ...
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2answers
100 views

API for multiple blockchains

Is there an API to get data for multiple blockchains? Most blockchain explorers already offer an API but I'd like to be able to get information for different blockchains through the same API.
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2answers
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Electrum's “script hash” form with NBitcoin?

I've come across how scripts are hashed in the electrum (stratum) protocol implementation by looking at the docs. I'm using NBitcoin, and I've tried to generate this hash from a segwit address, first ...
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2answers
181 views

What are the unnamed parts of the segwit/bitcoin cash raw tx shown and how do I get them as shown?

There are three parts to this. Shown here. Part 1. This string is found at the final form of the raw tx: ...
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2answers
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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 ...
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47 views

Sorry newbie, I dont get the PoS block creation, to much contradiction

I am sorry for the repeat question but I cant find a clear answer. Most of the time PoS isnt explained in detail (only explaining the advantage) and a lot of sources contradict each other and now I am ...
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1answer
3k views

Generate private key from a bip-39 seed phrase?

I'm able to generate a new private key and associated public addresses using bitcoin-core, but what I really want to do is generate a new private key from a 24 word seed phrase. I'm not sure how to go ...
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1answer
869 views

The warpwallet challenge 2

here you can find a public challenge aimed to brute force a brain wallet private key, derived from 8 char long [a-zA-Z0-9] passphrase with a salt of "a@b.c". Is it possible to adapt an hashing ...
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1answer
726 views

How do I get hash to verify transaction?

If I have the public key and signature for a transaction how do I get the hash value that is used in verify(hash, sig, pubkey). I want to know how to work backwards from a raw transaction to get it, ...
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1answer
28 views

Signature digital algorithm in bitcoin, to what will it change in the future?

in follow-up to the question: 85202 There, @Ugam Kamat wrote ""ECDSA is the first thing that can get vulnerable with quantum computer. signature will need to move to post quantum world much before ...
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1answer
121 views

How do I double SHA-256 the header of block #59,500?

I'm not sure how to combine all of this information. https://blockchain.info/block/00000000096af43105123c499521e1d131d172e7e1bf2ed0843290a921f1f6a7 Version 1 Time Bits 470771548 (is this the right ...
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1answer
419 views

BIP32 HD Wallets: HMAC vs. “just” Hashing the Seed

In A. Antonopoulus' Mastering Bitcoin (2nd edition) on page 106, there is a nice illustration showing how the basis for a BIP32 HD Wallet is generated: So here is the one thing I don't understand ...
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1answer
206 views

GPU Mining Speed

I am a bit new to the whole mining thing and just have a economical issue when it comes to selecting GPUs. Sorry if the title is in appropriate. Let's just say in mining Ethereum, a 1070 ti (costs $...
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1answer
2k views

Not getting enough Hashrate

I have an i3-3220 processor which i am using for mining. I know that you're supposed to use a GPU and all that. But currently i'm just trying it out before spending money. I'm using CPUMiner, mining ...
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0answers
104 views

Is my understanding of Blockhain Endianness correct?

I know questions on this topic have been asked to death in a number of different ways. I also know that what endian order refers to specifically is dependent on context. What I want are some ...
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0answers
75 views

Blake-256 genesis block generation helpint

I'm making my own coin and get problem to generate genesis for my fork. Genesis need to be blake-256. I was found this git https://github.com/lhartikk/GenesisH0 and tryed to use this script, i also ...
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0answers
2k views

BFGminer can't find my NanoFury on Raspberry Pi

Related: BFGminer can't find my NanoFury! Posted on the RPi Exchange as well https://raspberrypi.stackexchange.com/questions/14753/bfgminer-cant-find-my-nanofury-on-raspberry-pi Forums: https:...
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0answers
431 views

attempting to decipher a cgminer share.log

Here is 1 entry from a share processed in a feathercoin mine pool: 1367788723,accept,ffffffffffffffffffffffffffffffffffffffffffffffffffffffffff070000,http://mining-foreman.org:11341,GPU1,1,...
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35 views

How difficult is it to confirm a Bitcoin Block?

If I have done the math right to come up with this hash, to confirm a true block and this is a confirmed hash. You can look it up here Bitcoin Block #570240 ...
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0answers
39 views

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 ...
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0answers
90 views

Estimated number of hashes

This is not a duplicate of previous, similar questions I've read on StackExchange, since none of those questions, nor the answers, go into the difficulty theory, as espoused on the Bitcoin Wiki. ...
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41 views

What's a good repo to fork if you want to create a blockchain like a “Math” coin or Curecoin. (mining equations, not hashes)

I want to create my own crypto currency and I want to know what's the best github repo to fork when it comes to making a blockchain that's based off of getting the miners to do mathematical ...
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969 views

How can I mine ALT SHA-256 coins using a Bitmain S4?

The bitmain S4 does 2TH/s out of the box with no overclocking. For many alt SHA-256 coins, this can be 10% - 50% of the entire network hashing power, which would allow us to gain alt coins quickly, ...
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401 views

How to get bitcoin address from the pubkey_hash using bitcoin-abe or something else?

I'm using: https://github.com/bitcoin-abe/bitcoin-abe to import the blockchain into a mysql DB it is almost done after 5 days. So I started looking at the data and didn't see any addresses. I know the ...
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42 views

How may bitcoins hash algorithm be secured in the future from quantum computing brute forcing?

Other threads already answer very clearly that quantum comps could easily "break" /attack bitcoins chain. Now: Are there any ideas among the bitcoin devs circulating out there, how to save bitcoin ...
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21 views

Uniquely identifying a UTXO

I see two ways: Txid + index Txid + script hash Pros of the txid + index: Simple and short Cons of txid + index: It relies on array iteration being deterministic and all third party ...
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0answers
14 views

Swift implementation of bitcoin transaction creation

Is there a well known and widely used Swift implementation for creating raw Bitcoin transactions and getting their hash (SegWit and Non-SegWit) of signing? If not, is there a reference document that ...
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0answers
28 views

How does transaction authentication between buyer and seller look for?

I am new to cryptography and would like to understand how a digital signature works between a buyer and a Bitcoin seller. How does transaction authentication between buyer and seller look for? Please ...
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0answers
18 views

Merkle hash tree

Does the Merkle hash tree always have to be a binary tree? If not then what will be the advantages if it is ternary, tertiary…or anything else?
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0answers
99 views

How to convert a bitcoin address to the respective hash160 using bash?

I want to convert a list of bitcoin addresses to their respective hash160 values as illustrated using bash :
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0answers
95 views

Natural Language Processing and Blockchain?

This question is about one of the applications of the Blockchain in Artificial Intelligence. I am not very familiar with Natural Language Processing and I see that there is a Blockchain platform ...
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0answers
103 views

What's the most fair mining algorithm

lots of people claim that Bitcoin's mining algorithm is unfair because ASIC has definite advantages over other chips. So, what can be the most fair algorithms that maximizes decentralization of mining?...