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'!

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59 views

Is there any reason for an alternative Bitcoin implementation to use Berkeley DB?

The primary reason Bitcoin's C++ reference implementation uses Berkeley DB 4.8 seems to be backwards compatibility. It doesn't appear that BDB4.8 (or BDB at all for that matter) has any superior ...
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1answer
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Is it possible to derive bitcoin adress from blockchain.com id? [closed]

so here is the situation: my friend lost password to his "blockchain.com" wallet. He opened it in 2015 approx. And asked me to help get access again to it. He even doesn't remember are the ...
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1answer
27 views

Blockchain Login

We're working on a research based on the blockchain and I can't understand a point about login authentication. As we all know, blockchain is distributed or decentralized system, there is no central ...
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1answer
54 views

How are the nBits of a block calculated?

So I've been trying to figure out how the nBits of a block is calculated, but I can't seem to come up with an answer. I know (think) that it's based off the difficulty of the block, but I'm still not ...
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2answers
403 views

How is the Target Hash determined?

So, I understand how the amount of leading 0's are calculated, but how is the hexadecimal that come after the leading 0's calculated? For example, the previous mined blocks hash was ...
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1answer
77 views

How does solving a block work in relation to the first letter/number after the 0's?

I did a terrible job of explaining it in the title so I'll explain here. Say the target hash to solve for a block is 00004aef... etc. does that mean that you can't solve the block if you get 00005fad (...
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1answer
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Is there a way to only sync up to a certain block?

I am planning on doing some transaction analysis on the blockchain, however, I only want to do it on a small part of the blockchain first and then run it on the full blockchain later on. I have ...
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1answer
59 views

Why should I care about my transactions ever reaching the blockchain if I can spend them while unconfirmed?

From what I understand, I can use unconfirmed transactions because they are essentially already confirmed, they just need to reach the blockchain. This can create a chain of unconfirmed transactions, ...
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1answer
48 views

What is the official explorer and value API for Bitcoin?

I am new to cryptocurrency development, and I have noticed that Bitcoin has an official wallet for both Desktop and Mobile (correct me if I am wrong). My question is, does Bitcoin have an official ...
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2answers
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Can we look at how long it took to solve for the most recent block in the blockchain? (and how?)

For example, can we see, the latest block, somebody got lucky and solved it in 1 minute, but then the next block, nobody solved it until 18 minutes later? (and how can we see it?)
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1answer
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Bitcoin wallet showing balance, Blockchain receiving address shows 0.00, wallet is from 2009 and hasn't been synced

Old wallet, like from the first client, Has not been synced for at least 7 years. BTC balance shown, 0 pend, 0 available and blockchain address shows 0 balance. Still waiting for entire blockchain to ...
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2answers
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Is it true that all the bitcoins in existence are on the blockchain (the ledge), but it just depends on who the owner (address) is?

It seems that for the 18.5 million bitcoins generated, plus even the 6.25 bitcoins that were rewards just 10 minutes ago, are all recorded in the blockchain (the ledger), but it just depends on who ...
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1answer
54 views

Does the Merkle Root get constantly updated inside the block or does it only get added once the block is completed?

So, pretty much just the title. I'm just wondering how the Merkle Root works exactly. I know it's the result of pairing transactions and then hashing them until the last transaction in the block, but ...
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1answer
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How does the difficulty target affect the time to complete the block? [duplicate]

So, I'm currently doing a personal project where I'm creating my own crypto blockchain (just for fun). I'm currently coding the Difficulty Target part of the Blockchain, but I'm not entirely sure how ...
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0answers
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Is it true that the rate of finding a new block is constant, but just that the bitcoin reward become less and less? [duplicate]

Can somebody ELI5? Is it true that every block that is discovered, the person that discovered the block will be awarded 12.5 bitcoins? But to discover such a block, somehow the person has to get a ...
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1answer
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Is one blockchain of one exchange place the same blockchain used in other exchange places?

Sorry if the title is confusing, here is what I mean. I recently threw some fiats in Kraken and invested in Bitcoin, the first interrogation I had was "Can I see my transaction publicly on the ...
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2answers
143 views

How many computers are connected to the “Ledger” or the Blockchain of Bitcoin?

Somebody asked me about Bitcoin and I explained to him many many computers are connected to the Blockchain to keep records of all the accounts (or to keep addresses of the bitcoin and owner?). But how ...
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1answer
63 views

End to end bitcoin transaction flow

My understanding on bitcoin blockchain technology after going through some articles in past few days. I'm not sure that my understanding is 100% correct. I'm writing so that someone can correct me ...
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1answer
35 views

How basecoin transaction is added to a block?

I'm new to blockchain and bitcoin. In my understanding, miners are trying to find a nonce that is added to a block, and then the hash of the block will have some zeros at first and the first ...
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0answers
40 views

blockchain scanning

Hello friends please let me know that is there any script that can scan the entire blockchain and extract the signature values and find the match of given input. lets suppose i give the input "...
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1answer
123 views

If I use a MacBook Pro to mine Bitcoin (and keep records for the blockchain), how much can I earn in 1 month? [duplicate]

I know people say it is not practical to mine Bitcoins using a computer any more, but graphics cards are usually used to mine them. But suppose just for fun, I do use a MacBook Pro to mine it 8 hours ...
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5answers
76 views

Are ASICs Resistant to Malware Attacks?

One of the arguments made in favor of relying on ASIC mining hardware to secure the Bitcoin blockchain is that commodity hardware is more prone to a 51% attack since an attacker could easily infect ...
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1answer
24 views

What literal thing is determining the price of Cryptos / stocks? [duplicate]

Yes, supply and demand I know. But what literal thing is determining the price. When I see the price changing every second on Coinbase or Robinhood, what is controlling that. Is it an algorithm? What ...
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1answer
16 views

How difficulty increases to get the lucky hash in blockchain? [duplicate]

Currently first 19 zeros are required in bitcoin block hash which has become very hard. How this zeros are being controlled to increase? If it is dynamic what are the factors which has influence to ...
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2answers
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1 MB Block Size as a Anti-DoS Attack Measure

Wikipedia explains the rationale behind the 1 MB block size limit as follows: The one megabyte block size limit was added in 2010 by Satoshi Nakamoto as a temporary anti-DoS measure A SE post ...
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2answers
574 views

How does the BTC protocol guarantee that a “main” blockchain emerges?

I'm reading up on the bitcoin/blockchain technology. Usually, the part about proof of work and how to create a block is well explained. However, what is never explained is how/why the communication of ...
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0answers
23 views

Everyone stops mining? [duplicate]

I want to learn about bitcoin/blockchains, and from what I understand so far is, new blocks are validated/continued by the finding of hashes every, 10-ish minutes (mining). My question is, if everyone ...
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1answer
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Could a miner set a maximium transaction fee rate?

Could a miner set a maximimum transaction fee rate? I mean validate only transactions between x and y satoshis/byte? I know is not clever. Is it possible?
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1answer
48 views

What's going to happen if someone has access to my Bip32 root key?

Can my bitcoin get stolen if someone else has access to my Bip32 root key?
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0answers
30 views

How can I generate a database/list of all non-empty bitcoin addresses with their current balance?

After downloading the full blockchain, how can I parse it and generate such a database? Can you point me in the right direction?
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1answer
58 views

nLocketime error PUSH TRANSACTION ERROR: 64: NON-FINAL

Created nlocktime with electrum and used the time date feature which is using unix time instead of block height number for the locktime. SO when pushing the raw tx before its time I get code 26 ...
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0answers
29 views

To what extent is the actual downloading of blockchain data what slows down a “fresh sync”? [duplicate]

I've just sat an old computer with fresh Linux Mint and Bitcoin Core installed to sync from scratch. Since its HDD is 250 GB, I had to enable "pruned mode" since the blockchain is currently ...
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1answer
29 views

Developers, programmers new to bitcoin engineering ecosystem [closed]

Any sites, forums dedicated to developers new to bitcoin. Any recommended git repo, site that shows how to interact with a node, do .i.e. p2sh,p2pkh on testnet.
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2answers
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Is this the ledger?

Lots of articles about bitcoin say that anyone can see all the transactions that have ever taken place, and they call that "the ledger." But none of those articles give a link for where to ...
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1answer
28 views

Do all of the records in the same block share the same hash?

From what I have read, when a transaction is settled, the record is added to a block among with other records. The block is given a new hash as well as a hash from previous block. So does that means ...
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1answer
574 views

I have forgotten my Blockchain account password and 12 word recovery. I have the wallet id and password to the wallet. Can i get my funds back?

I have forgotten my Blockchain bitcoin account password and 12 word recovery(possibly didn't even create one). However I do have my wallet id and the password to the wallet. Is there a way to get the ...
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1answer
81 views

Best way to store fund on the lightning network

Suppose that someone want to store 0.1 bitcoin on the lightning network for a period of 1 year to use services such as buying and selling things but doesnt know which one and with who yet. What would ...
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0answers
28 views

couple years ago I set up a coinabase wallet or blockchain wallet to make a couple of purchases. How do Iretrive any bitcoin left in that wallet?

A couple of years ago I set up a bitcoin wallet on blockchain. How do I retrieve any bitcoin left in if I don't remember all my passcode info. I'm VERY tech ignorant! HELP!! I'm on disability and ...
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1answer
44 views

Understanding Transactions, Mining, and the 10 minutes block solved

I'm not entirely sure if the questions I have regard to Bitcoin all relate to each other? How do miners decide how many transactions they should have in a block in order to mine 1 bitcoin? When miners ...
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4answers
151 views

How isn't blockchain fundamentally broken?

This question is a good 3 to 5 years late on the crypto trend but nevertheless I'm still having trouble to understand. The chain works by verifying every previous block, right? How does this not ...
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2answers
51 views

How can I determine where a BTC transfer from one of my accounts to another went wrong?

I have two BTC accounts on a Ledger S Nano hardware wallet, which I can check via the Ledger Live software. I've transferred BTC many times already, to my own accounts and to other people, and never ...
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1answer
39 views

How do internet wallets connected to full blockchain nodes

How do internet wallets such as Coinbase connect to the a blockchain node? Doesn’t the node itself create a default wallet object on startup? How is this replaced by internet wallets which hold ...
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1answer
46 views

how large a block can grow?

I was looking for a blockchain exchange but I didn't see so I am posting this in Bitcoin group. Apologize if it's too naïve. I've started to learn about bitcoin and blockchains. I don't understand how ...
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1answer
303 views

How many BTC addresses have balance in them?

Of all the possible BTC addresses, how many have balance in them? And what percentage of the total possible addresses is that?
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1answer
70 views

How does the blockchain know if its block hashes have been tampered?

I'm dealing with some problems to finally understand how implicit consensus works and I've come across with one question. Suppose the following: A malicious miner proposes the following block to be ...
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1answer
78 views

What is the difference between Consensus and Distributed Consensus?

This is more of a clarification than as a question. Since I didn't have the rep to post a comment in this question, I'm putting this itself as a question. Sources I've referred till now: A ...
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0answers
142 views

Jaxx and Exodus wallet out of sync for BTC

I was using both Jaxx wallet and Exodus in parallel using the same passphrase. However my Jaxx wallet was configured to generate a new address on every transaction and Exodus wallet had a fixed ...
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2answers
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Does this accurately show how a crypto-currency miner software works? [closed]

just got a question here: Does this flowchart accurately show the step-by-step workings of a typical crypto-miner software? I'm a newbie in the cryptocurrency business. Though I welcome comments and ...
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1answer
230 views

If only one Bitcoin miner gets the block reward, is it worth mining only for the transaction fees as a (not-so-competitive) solo miner?

I have heard (but not that knowledgeable) about mining-pools. If a weak system joins the pool, it has a chance to get a portion of the block reward, but I assume that not all of the miners are joined ...
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0answers
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Bitcoin stuck in old tablet with really old wallet - Can't send out or back up

I found an old tablet I have and it had some BTC on it. I got it in 2014 and it has a wallet called 'blockchain' on it which I think is blockchain.info at the time and now blockchain.com I am trying ...

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