Questions tagged [blockchain]

This tag should be used for questions pertaining to the blockchain. The blockchain is a list of all transactions that have occurred using the Bitcoin currency. It consists of blocks which are linked to each other, and each block consists of transactions. DON'T USE THIS FOR THE SERVICE NAMED 'blockchain.info'!

255 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
1
vote
0answers
22 views

Does everything of a Blockchain Network rely on its underlying “Consensus Protocol”?

I have been reading about and researching on Blockchain Technology for quite a while now, and what I can comprehend from the very primitive architecture of these "Distributed Databases" is that ...
1
vote
0answers
28 views

How is the fault tolerance measured?

“If the number of nodes that agree exceeds 2/3, the blocks or transactions of clients will be accepted” Practical Byzantine fault tolerance (pBFT) : (n - 1) / 3 I read those 2 things in a PDF that a ...
1
vote
0answers
75 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 are no longer valid ...
1
vote
0answers
120 views

How does the bitcoin network remove duplicate blocks being generated by multiple miners?

Say there are two minersA&B and each of them have produced the next block almost at the same instant. In this situation how is the network going to decide which one is the main block and abandon ...
1
vote
0answers
49 views

UTXO are not being listed while they have conf over 100 (btcd + simnet)

I am using BTCD and while in Simnet, I generated 104 block (Best block : 104) But when I listed utxos, transaction from block 3 and 4 (which have 102 and 101 confirmations) don't be listed. So balance ...
1
vote
0answers
197 views

Idioms of use/ bitcoin heuristic

I already know the answer of a) part which is Alice. Can anybody help me in finding answer of b) part.
1
vote
0answers
237 views

Blockchain testnet Websocket

Please, how do I subscribe to blockchain testnet web-socket for an address. I seem to find that for livenet, any help?
1
vote
1answer
62 views

Question Regarding Send_to_many function of blockchain wallet api

I am using send to many function of blockchain wallet api and i am facing issue. when upto 20 transaction done then after i get error in terminal that 1538652825520 - error: ERR_PUSHTX ...
1
vote
0answers
16 views

Transactions Uniqueness Verification

From what I gathered, to process a bitcoin transaction I basically create the transaction object locally, add my signature generated with my private key, then send this to a public node for it to add ...
1
vote
2answers
103 views

How much data does it take to prove a given transaction exists on the blockchain?

As I understand the SVP protocol, a client can be reasonably certain that a transaction has been accepted on the blockchain if they know it is a member of a certain block, via the Merkle path, and a ...
1
vote
0answers
55 views

Exchange development good practices

Is there any guide or good practice rules to follow when developing a service that uses the Bitcoin and other cryptocurrencies protocols? For instance, how is the best way to know if a user deposited ...
1
vote
0answers
28 views

Are there any blockchain implementations that are not based on the Bitcoin source code?

I wanted to code up a blockchain from scratch using C++. So I got around to looking at some existing blockchain source code to get some ideas. But all I can find is the Bitcoin source or forks of it. ...
1
vote
0answers
149 views

Sources to study Bitcoin source code, more specifically its UTXO model C++ code?

Can anyone suggest some sources to learn about the source code of bitcoin or similar tech which are using UTXO model for their transactions.
1
vote
1answer
106 views

Hashgraph public ledger (51% attack)

I have some basic doubts about consensus algorithm like hashgraph. For instance, let's take Raft the simplest leader based consensus algorithm, we cannot use it in a decentralised setting because it's ...
1
vote
1answer
83 views

What is Sentinel Chain? Is it a cryptocurrency scam?

What is Sentinel Chain? Is it a cryptocurrency scam? Can somebody help me? Thx!!!
1
vote
0answers
43 views

Bitcoin Miner for HP application

So, I installed Bitcoin miner from an app store already built into my HP computer. I've downloading blockchain to keep my bitcoin wallet but havent really used it all that much to know when im ...
1
vote
0answers
215 views

Locked balance in my wallet

I have transferred bitcoin form copay to my friend wallet 4 months ago and I just realized that my coin never sent to my friend's wallet and status in Copay wallet is "Locked Balance". My question is ...
1
vote
0answers
289 views

How does one create a blockchain snapshot (vs a bootstrap)?

I have read How to create a blockchain snapshot for a hardfork? but it does not answer this question. I understand the bootstrap.dat file is basically a concatenation of the blk000x.dat files, but ...
1
vote
2answers
82 views

What happens when a node cannot find the base Block of a newly received Block

This particular question has been bugging my mind for sometime now. Suppose there an adversary miner who mines a Block with one of his transactions. The miner would only send the updated Block to a ...
1
vote
0answers
24 views

Is there a way to point bitcoin-qt from inside linux to the blockchain i downloaded in windows?

I duel boot and would like to point linux to the blockchain i downloaded in windows rather than download it again.
1
vote
1answer
674 views

Getting Litecoin cash out of my Trezor

I am trying to get my private key out of my Trezor in order to access my Litecoin cash. I used the following site in order to generate the private key out of my 24-word recovery phrase: https://...
1
vote
0answers
71 views

Using blockcypher BitcoinJs at clientside is secure or not?

I am trying to create new transaction using bitcoinjs at client side. Is it a secure way to create a transaction from Client side, which includes curl call. Scenario, if I start from creating the new ...
1
vote
0answers
85 views

Origins of the Blockchain data structure

Where did the blockchain data structure originate from? Is it a product of computer science research or did it just evolve from more established data structures like binary trees and linked lists?
1
vote
0answers
59 views

Which peer-to-peer technologies are used to sync blocks in a blockchain?

I searched a lot about it but didn't found out anything. I want to know about the technologies used in block syncing and the algorithms.
1
vote
0answers
128 views

Bitcoin mining specification to write own mining application

Where can I find the design specifications to write my own mining application for mining bitcoin. More I read I find there are number of implementations and some pools only work with specific mining ...
1
vote
0answers
101 views

How long to verify transaction is not overdrawn?

Given that the block chain is 140gb now, how long does it take a node or a miner to verify that a transaction is valid i.e. Not giving negative balance for an address? Also, given that the number of ...
1
vote
0answers
119 views

Bitcoind stops downloading the blockchain

I have bitcoind running on Ubuntu 16.4 VPS. The problem is that it just randomly stops downloading the blockchain and when i run bitcoin-cli getblockcount it returns in begining the block count - ...
1
vote
0answers
502 views

Bitcoin Address Tag

I'm new to the cryptocurrency world but I was wondering if someone could help me answer my question regarding bitcoin address tags. I was on an exchange platform and I wanted to transfer my coins to ...
1
vote
0answers
165 views

Network-shared Bitcoin core blockchain directory

What i'm looking to do is having one parent server for blockchain and more than one server for bitcoin core to divide effort on more than one server and save disk storage. Let's pretend that i've ...
1
vote
0answers
121 views

bitcoind > 0.9 - unexpected end of data - handling of arbitrary data in tx - UPDATE

I'm working on a pretty old blockchain here which was based on codebase 0.9 and never updated since. Now getting that stuff to a proper codebase, I'm facing following situation on initial block ...
1
vote
0answers
181 views

Percentage of BTC belong to early adopters

Are there any statistics that break down the total amount of circulated BTC that is owned by “early adopters”? I know it’s theoretically possible by manually examining the blockchain for unspent ...
1
vote
0answers
89 views

Tether on Bitcoin Blockchain

USD Tether is running on the Bitcoin Blockchain right? Is it like a 2nd layer solution or how does that work?
1
vote
0answers
228 views

how to import my wallet from blockchain.info into bitcoin-qt?

I have read the related discussions about how to import a wallet and though they are close, the answers does not help with this problem so I'm asking it here and now. I have my bitcoin public ...
1
vote
0answers
73 views

Do wallets break trustless character of cryptocurrency transactions?

My question is, whether lite wallets and wallets in general break trustless character of cryptocurrency transactions or not? In case of a lite wallet, even I hold the keys, a blockchain itself is ...
1
vote
0answers
57 views

How does cloakcoin determine valid transactions?

I recently read the enigma white paper but I'm having a hard time figuring out how the network reaches consensus of valid transactions if the inputs and outputs are scrambled. How does the blockchain ...
1
vote
0answers
501 views

Blockchain download stuck on Bitcoin core wallet

The caching up process was progressing (slowly but still progressing) until it got stuck after processing 436820 blocks: http://i.imgur.com/4nbP3ML.png 3 days after, I'm still at 70.76% Says I'm ...
1
vote
0answers
143 views

Did wrong. Btc to Ltc from Trezor

Accidentally/stupidly sent Btc to Ltc address. On my Trezor I generated a Btc 'send payment', then I generated a 'receive payment'. Trezor asked for the Ltc address to be converted, which I did, then ...
1
vote
0answers
280 views

How to setup, sync, backup en restore blockchain when using bitcoin-qt

I am trying to setup a Bitcoin client using Bitcoin Core and Armory. Synchronization with the network seems troublesome. The blockchain is +120GB and corruptions can easily occur. I have tried twice ...
1
vote
0answers
626 views

How can I see the wallet balance using Blockchain Api? C#

Stupid question, but I cant get it So, then I type my wallet adress on blockchain.info I immediately can see my balance, but from my project I can't type something like: WalletAddress wa = new ...
1
vote
0answers
27 views

How can the blockchain be used to verify “rarity”?

The question was inspired by this article, about an art collector, who said that he knew that the piece of art he was collecting was "rare," with only 391 copies, because of the blockchain. First, ...
1
vote
0answers
579 views

How does bitcoin prevent tampering of blockchain?

Suppose C is starting bitcoin full node for the first time. C would have to download blockchain from some place. Could not this leave bitcoin susceptible for tampering? If blockchain stored in ...
1
vote
0answers
83 views

Bitcoind blockchain download loop

I downloaded and setup the bitcoind and by using the command to check the progress of the download it shows like it gets to 25k~ and then starts over back from 0 and so it continues in a handless loop....
1
vote
0answers
154 views

Stuck unconfirmed balance in multibitHD (stuck since 2015)

I recently started reusing bitcoin. Let's just say, I gave it a lay off when the value of bitcoin bombed in 2015. I sent my bitcoins from my MultiBit wallet to MultiBitHD on 13th november 2015. They ...
1
vote
0answers
33 views

Will block chain pruning work for zeronet (Website hosting on block chain)?

Pruning limits block chain by removing old blocks. Will this methodology work for zeronet. One of the perks of zeronet is to be able to access websites (read zites) even without internet connectivity. ...
1
vote
0answers
25 views

I was unable to fund another wallet since this morning

Hello everyone, I have been trying to transfer some amount from my wallet to another bitcoin address but didn't successful since morning, please I need help on this critical issue.
1
vote
0answers
57 views

Bitcoin did not get to reciever

I sent $50 worth of bitcoin to my cousins blockchain bitcoin address, it said sent and the bitcoin amount deducted from my wallet. However, the bitcoin did not reflect in my cousin's wallet. I ...
1
vote
0answers
76 views

Explanation about how to build network upon bitcoin blockchain

Sometimes, I would see some news says: xxx service is build upon bitcoin or base on bitcoin blockchain xxx servie is making use of current bitcoin network And today I see a DNS project says that it ...
1
vote
0answers
183 views

Why Does Litecoin Transaction Show Zero Confirmations for last 3 hours

I tried sending 193.09 LTC from my mobile wallet. There wasn't an option for how much of a fee to add to the transaction, so I just sent as is. It took a long time to send from my phone and then once ...
1
vote
0answers
438 views

Is there any library to process scriptSig script in transaction, and other scripts?

I'm trying to parse hex representation of scriptSig, in normal transactions there are variable int, r&s, pubkey. But some are really weird, like those ones: ...
1
vote
1answer
348 views

Need help to understand where bitcoin transaction has gone

I am new with bitcoin and I need some help from experienced members. I have a server with bitcoin core where we accept some payments and use bitcoin core as mercant. The problem is that we have got ...