Questions tagged [algorithms]

Regarding the underlying algorithms related to Bitcoin protocol.

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2answers
373 views

Is verification of a blockchain computationally cheaper than recreating it?

One of the advantages of cryptocurrencies like Bitcoin that is often repeated is how hard it should be to manipulate past transactions. The reason that is often stated is that you would have to re-...
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2answers
199 views

Crypto exchanges algorithms

I have noticed that if I put a buy order up - for instance - on any not so heavily traded coin, if close to the highest bid, often within 20 secs the highest bid will try to beat me. Or when I put it ...
6
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1answer
339 views

What are the differences between Bitcoin and Libra?

Recently, Facebook announced to launch a crypto currency called "Libra". Libra is managed by associations under the name "Libra Association", see https://libra.org/en-US/association/. What are the ...
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1answer
142 views

What is the difference between BFT and PBFT

What are the differences between BFT and PBFT? I want to know the difference between these two concepts. If there is any improvement in the BFT's limitations, let me know. Please answer. Thank you.
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1answer
247 views

Can the Antminer S3 mine Bitcoin using Blake2s algorithm?

If so, how? Nicehash can also do this, so what I'm trying to do is point my Antminer S3 to Nicehash's Blake2s stratum. But will changing the stratum URL be enough? Do I have to set up Blake2s first?
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2answers
39k views

Simple bitcoin mining algorithm

I'm trying to figure out how does simple Bitcoin mining algorithm works in plain simple c or c# or some pseudo language. I've found an example at http://pastebin.com/EXDsRbYH, but unfortunately It ...
25
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4answers
72k views

The bitcoin mining algorithm from a programmer's viewpoint

This page: Blocks said mining is actually to solve a mathematical problem, but reading Block hashing algorithm doesn't give much help. I also tried reading bitcoind source code, but reading code takes ...
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0answers
10 views

what happens when their is a bicoin algorithm half? [duplicate]

I saw in an article something about a bitcoin algorithm half in 2020, what exactly is this, I have tried looking this up but I couldn't find anything that told me what it was only this.
3
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1answer
85 views

Why haven't a large number of cryptocurrencies copied Primecoin's mining algorithm? [closed]

According to my understanding, generating an ever-growing list of prime numbers benefits mathematics and society in some mysterious way. Given this, why have more recently created proof-of-work ...
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1answer
146 views

What happens if I use same k twice in DSA algorithm?

To sign a message , we choose nonce k but what happens if we use same k twice to sign a message using DSA algorithm?
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3answers
2k views

Get uncompressed public key from compressed form

A similar question has an answer in Python which links to the bitcointalk forum: How can I get the uncompressed public key from the compressed public key in openssl? https://bitcointalk.org/index.php?...
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1answer
956 views

Could Bitcoin be based on accounts instead, more like banks?

In banking, a user's account will have a balance, and when they spend an amount is credited from their balance. For example, the account #310 could have $100, and spending $10 would reduce it to $90. ...
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2answers
45 views

I want to know how I can express a phenomenon found in Merkle Trees mathematically

I want to know how I can express a phenomenon found in Merkle Trees mathematically. If I want to figure out which leaf node in a Merkle Tree has changed I can look at the authentication path to figure ...
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1answer
253 views

How an order fulfillment works

I'm trying to understand how order fulfillment algorithm works from technical point of view. Let's say I created an order to sell 0.8 BTC and buy 5400 XRP along with other orders to sell 0.35 BTC, 2....
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1answer
82 views

How can I check what mining algorithm does an altcoin use?

Where in the sourcecode files can this be checked? For example, lets get a specific coin: Chronon https://github.com/ChrononGroup/Chronon In what file can one check the mining algorithm?
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3answers
8k views

How to calculate a hash of a Tx?

How does one calculate the hash of a Tx? Which fields need to be double SHA hashed and in what order?
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1answer
140 views

which cryptocurrency using Slasher algorithm for Proof of Stake mining process?

Ethash algorithm for PoW mining process on my own cryptocurrency. I need to use Slasher algorithm instead of Ethash algorithm for Proof of Stake process. My question is Which cryptocurrency using ...
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2answers
4k views

How to sign a message using Bitcoin private key?

How does one create a proper signature for a given message using Bitcoin private keys? I have an input address of 5JeWZ1z6sRcLTJXdQEDdB986E6XfLAkj9CgNE4EHzr5GmjrVFpf or ...
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1answer
94 views

Is the whole idea of proof of work or proof of stake quite unnecessary and superfluous for cyptocurrencies?

I only have a vague idea of proof of stake, but I think I reasonably understand proof of work. In the case of bitcoin, the whole hash thing business has to be combined with a mechanism to increase the ...
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4answers
5k views

Algorithmic trading python library?

I am starting to do Algorithmic trading in cryptocurrencies using Python libraries. Most exchanges have RESTful APIs that make it easy to write you own code and get started. However, I would like to ...
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1answer
93 views

How many transactions per second can blake2s algorithm can handle?

i saw the hash functions speed (miBps) are 947 according to this website: https://blake2.net/ but how many transactions blake2s algorithm can handle? Verge uses the same algorithm right? more about ...
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2answers
141 views

How to return Tx to mem pool from orphan block

This question is centered around the implementation of how transactions on an orphan block return to the mem pool. In my understanding, once a block becomes orphan all it's transactions (that aren't ...
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4answers
7k views

Why can't we design a bitcoin that does useful work? [duplicate]

The bitcoin network, including every miner, is the biggest computing project that humanity has created. Thus I ask: why, instead of using it to generate useless data, don't we use it to generate ...
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5answers
41k views

How to build a bitcoin trading bot

I'd like to experiment with bitcoin technology, crypto currency, and encryption. I thought the best way to accomplish that is building my very own bitcoin trading bot. It seems like a daunting task, ...
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1answer
311 views

Why do I keep getting a connection lost error in Nicehash Bitcoin mining

The algorithm I'm using is daggerhashimoto. At first I thought this was because of my country blocking Bitcoin mining or something, but it doesn't work even if I'm using a VPN (vpnbook.com/freevpn). ...
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2answers
54 views

Any attack vector for Proof of Witness?

When Alice wants to send Bob some coins all she has to do is sign a transfer of ownership with her private keys and publicize that announcement until Bob is happy with the number of witnesses. For ...
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1answer
307 views

What algorithm do bitcoin miners use to choose which tx to include in their block?

I understand it's in the miner's best interest to receive as many fees as possible for his hopefully-accepted block, hence it should include the most rewarding (fee / size) txs - up to the 1MB limit. ...
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1answer
168 views

How is Ethash a 'memory hard' algorithm if it utilizes peak GPU memory bandwidth?

According to the Ethash algorithm described here, the computation for each nonce requires a loop of 64 iterations, where each iteration reads a chunk of 128 bytes from a pseudo-random location in ...
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1answer
395 views

Difference between scrypt and sha-256 mining?

So in detail my question is: are both these two algorithms different from each other?. I read somewhere that this two algorithm is used for the different cryptocurrency. if that's true. then why? ...
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1answer
843 views

Implementing NiPoPoW algorithm

Hello, We, a small team, have implemented about 95% of a breakthrough scientific proposal that is describing the NiPoPoW Non-Interactive Proofs of Proof-of-Work. You can find our source code ...
3
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1answer
96 views

Understanding what is being run through Sha256

When I am running through an example for Sha256 I am not understanding how to arrive at the right answer. If I use the following Hex string: ...
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1answer
379 views

Does full node store all valid forks and “alternative” blocks from blockchain history?

Forks are possible when mining the blockchain and happen "all the time" during mining. This means the nodes monitoring the blockchain have recorded many forks during blockchain's lifetime, with some ...
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2answers
247 views

At which point and how does the miner who successfully solved hash get coins? [duplicate]

When miner creates a valid block he broadcasts that to the network. It can happen that someone else did the same. So we have half nodes think that chain+A is correct, and other half that it is chain+...
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1answer
111 views

Why are transactions grouped into blocks? (how are new blocks-to-solve formed)

Why are transactions grouped into blocks when put onto blockchain (PART 1)? Lets say we have just put a block on a chain and there are no blocks at the moment that users mine. At that moment how many ...
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1answer
198 views

How bitcoin protocol checks transaction is valid (in particular that inputs are unspent)?

I'm learning bitcoin protocol theory. To pay to someone you use a transaction. In the transaction you specify some of old transactions that gave you money (so called inputs). These inputs should have ...
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1answer
2k views

Nicehash autoselected algorithm with very high difficulty

I'm new at this so please bare with me I have a couple gtx 750 lying around so I decided to give mining a try. I used nicehash, according to the site "NiceHash Miner autoselects the most profitable ...
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1answer
101 views

Does the 100+ GB blockchain database contain every transaction?

Does the 100+ GB blockchain database contain every transaction since the beginning, or only a digest of them? I've read Nakamoto's paper and I see: the spent transactions before it can be ...
1
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1answer
628 views

if a Bitcoin mining nounce is just 32 bits long how come is it increasingly difficult to find the winning hash? [duplicate]

I'm learning about mining and the first thing that surprised me is that the nounce part of the algorithm which is supposed to be randomly looped until you get a number smaller than the target hash .. ...
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0answers
84 views

Why do different currencies use different units of difficulty? [closed]

I'm trying to understand the relationship between difficulty and network hash rate. I feel like I understand it for Etherium, where the difficulty is the same as the total number of hashes the network ...
1
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1answer
440 views

How do miners decode the input transaction?

When a transaction is broadcasted to the network, the transaction string contains the little-endian of SHA256(SHA256(X)) where X is the transaction string of input transaction. Now, since SHA is ...
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0answers
315 views

Probability of Orphaned Blocks

This is a question regarding the probability of orphaned blocks depending on the block interval. I am using Bitcoin vs Litecoin as an example. Assuming equal hash rate and number of transactions, ...
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0answers
512 views

How do Bitcoin and Litecoin compare in scalability?

Bitcoin and Litecoin are very similar, however they differ in the hash algorithm, the block interval and reward schedule. How do these characteristics impact the scalability in terms of e.g. ...
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0answers
2k views

What is the difference between X11 and X11 Ghost (Gost)

I'm looking at SIBCOIN. Its algo is X11 Gost. I've been trying to see what differentiates that algo from "plain, vanilla" X11.
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2answers
717 views

Own bitcoin pool miner algorithm

I receive these variables from the mining pool: job_id, prevhash, coinb1, coinb2, merkle_branch version, nbits, ntime, clean_jobs. What must I do with them? Can you write step by step formulas how ...
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0answers
510 views

Bitcoin pool mining test [closed]

i write part of miner for check correct work private String generateCoinbase(String en2){ StringBuilder coinbase = new StringBuilder(); coinbase.append(coinb1); coinbase.append(...
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1answer
442 views

Merging blockchains after algorithm change

When a cryptocoin changes algorithm (eg. scrypt to X11), how does one achieve the merging of the two blockchains? I'm assuming that they couldn't be directly compatible based on being completely ...
2
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1answer
124 views

Mining and pending events

I am trying to fully understand the block chain algorithm and in particular, the consensus. My understanding is each miner has a pool of pending events -- events that have not yet been included in a ...
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1answer
554 views

Bitcoin mining algorithm - target - Java

Default share difficulty is 1 (big-endian target for difficulty 1 is 0x00000000ffff0000000000000000000000000000000000000000000000000000) How to calculate this? How it look like on Java code? What ...
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1answer
521 views

Is Quark as secure as SHA 256?

I'm trying to make certain I'm understanding the purpose behind the Quark algorithm. There are lots of devices that need secure algorithms but have severe power and processing constraints such as ...
4
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1answer
977 views

Transaction signature algorithm

As I know, standard ECDSA digital signature algorithm returns two values (according to this article or Wikipedia), but transaction push services or APIs, like this one, require one string as a ...