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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Python code error : Hash greater than Target

While trying to run a reference code from GitHUb i am getting an error "Cannot Mine-Hash is greater than Target". As i am just a beginner with coding i am not able to figure this out. Kindly ...
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Should I share my seed phrase to earn airdrop tokens?

Someone on Face Book said I could earn free crypto by appying for an airdrop. He told me to download Blockchain from app store to my phone. I did this and created my account with a password. I also ...
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Scenario: What would happen to Bitcoin if the internet would crash - world wide [duplicate]

What would happen to Bitcoin if the internet or power would be shut down for a moment, all over the world? Would this destroy Bitcoin or other block chain based money or technology?
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Are multiple parents/children possible in a block?

I always learnt/thought bitcoin blockchain is like a linked list and it can have only one parent and one child at max
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Can I merge blockchain downloads?

I downloaded the most recent 15GB of the Bitcoin blockchain. But I also have a back up from a year ago when I downloaded some more. Can I merely copy the old blockchain files into ~/.bitcoin and have ...
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2 votes
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Delay of a revocable transaction in the Lightning Network

The Lightning Network Whitepaper describes the concept of Revocable Sequence Maturity Contracts (RSMC), which allows a commitment transaction to be revoked during a predefined delay after the channel ...
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2 answers
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Isn't burning bitcoins a kind of fraud?

BitCoin burning is the process by which digital currency miners and developers can remove bitcoins from circulation, thereby slowing down inflation rates or reducing the total circulating supply of ...
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Tracing Blockchain.com Wallet-ID from Receiver Address. Address Re-use

I am wanted to question related to blockchain.com ? If i have some one BTC to BTC receiver address can i trace name or wallet id or something? For example if i generate multiple btc to btc receiver ...
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How do I find out where my bitcoins got sent to? [duplicate]

I withdrew bitcoin from my account in Binance in 2018 and still have the email they sent with address it said it sent to,18bVuA2FxDdz5gE4qf9MgbsNxp2F46PaLD The time and amount looked correct. Now I ...
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Where and how are raw transactions stored on the blockchain?

My understanding is that transactions are stored on the blockchain in double hashed format: ie SHA256(SHA256(rawtransaction)). But it is also possible to get access to the raw transaction. This means ...
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Developing a Bitcoin POS (Payment Page) - How do I identify the transaction

This is probably a basic question but I can not find an answer. We are developing a BTC payment process for a Point-of-Sale. We have managed to build this fine and can make requests (QR code) for a ...
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Bitcoin in wallet transactions but not on the blockchain (old wallet)

I've been checking old wallets and found an unconfirmed transaction that's on the wallet but not on the blockchain transaction id (missing from blockchain) ...
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I have 12 phrase recovery code for bitcoin wallet [closed]

I have 12 phrase recovery code for bitcoin wallet and I use it for purchased shop and for every deposit generate a new wallet now I restore my 12 word to blockchain and electrum and exodus and … but ...
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1 vote
1 answer
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what happens to low-fee or forgotten transactions

If a transaction has a fee that is too low then it is possible for the transaction to either age out of the mempool (14 days) or get removed because the mempool reaches its max size. So what happens ...
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What can I do if someone obtained control of my blockchain wallet?

I fell for a bitcoin scam and I would like to undestand what are the risk associated to it. i established contact with scammer on instgram he convinced me to join the mining pool i had to create a new ...
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Why do transactions have to be bundled in a block? Why not mine single transactions separately?

Why do transactions have to be bundled in a block? Why not mine single transactions separately? What is the advantage of bundling transactions in a block? Also are there any blockchains/decentralized ...
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How does Bitcoin verify that a user owns the bitcoins he/she spent?

I'm making my own blockchain based currency for a school project and kind of hit a roadblock. I have a wallet class which initializes with zero coins. What prevents the user from just sending a ...
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Money sent to wallet was removed in unexpected second transaction 30 minutes later

I got sent bitcoins to my cake address then the coins went into the account as unconfirmed for about half an hour then they were sent to another address, and the confirmations have finished and i dont ...
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3 answers
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Why must the entire chain be included in calculations if it's already been validated. Why can't the validated portions be archived to save energy? [duplicate]

I'm new to this so don't laugh. If all of the previous transactions in a blockchain have been validated as authentic, why does the entire chain have to be carried forward in the calculations? Why ...
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1 answer
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How can one join and leave Blockchain network? [duplicate]

As a newbie, it seems a bit abstract for me to imagine how Blockchain works! I'm curious that how my friends and I can join a Blockchain network? When we don't want to stay, can we silently leave and ...
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2 votes
4 answers
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What is the meaning of difficulty in Bitcoin mining?

I'm a beginner in Bitcoin and Blockchain technology, so I have a question after reading about the difficulty in Bitcoin mining: What does the difficulty actually mean? I read that A high difficulty ...
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1 vote
1 answer
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Some technical questions about Bitcoin [closed]

I'm a developer. I've read a lot about Bitcoin structure and how it works. But yet something confuse me. I would like to share them with you and read your answers: When a miner solves a block, how ...
2 votes
1 answer
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Forced fork of older, low difficulty blocks

Let’s assume main chain (A) height is 1000 and the difficulty adjustment is 50 blocks. At height 450, the difficulty is very small. By modifying timestamp of blocks 450-500, I mine a fork (B) such ...
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1 answer
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If nonce can change the hash then it should be changing the next block's previous hash?

I am studing blockhain and i know that a block hash is linked to the next block in previous hash and it cant be changed for valid reason. Reason is : because if someone have changed hash then then he/...
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-1 votes
2 answers
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Is there a way to change Bitcoin Open Source code to be more Environmentally friendly?

If Bitcoin is open source as proponents mention, why can't make Bitcoin as environmentally friendly as Ripple, Dogecoin, Cardono etc? Elon Musk tanked the market by mentioning Dogecoin is More ...
3 votes
1 answer
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What exactly is a "blockchain developer"? [closed]

Hello everyone. This isn't specifically a bitcoin thread but due to recent events I think it is important that people get an understanding of the real Elon Musk as I have no doubt he will try and ...
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Get/Calculate Address

I'm currently using a program that analyses the block files. It splits all the stuff into multiple .csv files. Is there any method I can do to get the addresses & amount sent/received from tx_in ...
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1 answer
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If there are a significant number of pruned nodes on the network will it impact network security?

The size of the Bitcoin blockchain is reaching 350 MB and adding more than 60GB per year. I feel verification node centralization a risk if the cost of storage does not drop. My question 1: Is using ...
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2 answers
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Where can I turn the unique hash result of SHA256 to bitcoin?

i watched on youtube from 3Brown1Blue channel about "how bitcoin works", it said what makes bitcoin valued is come from the unique hash result of SHA256. for example if someone put string to ...
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1 answer
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How transaction happen in blockchain?

Suppose there is a cryptocurrency with a chain of 5 blocks. When users trading with this cryptocurrency, then:- how the buy and sell will be going to happen i.e. Which block will make the transaction ...
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Are trades done on exchanges added to blocks?

I found a few answers to this question here, here, and here, but my doubts weren't cleared. Are trades done on exchanges added to blocks? Or are they only added once you withdraw the funds to your own ...
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4 votes
2 answers
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Why is the full blockchain required, effectively forever?

I do understand that every block is validated in terms of the blocks before it by way of the previous block's hash, all the way back to the genesis block. However, could the protocol be modified such ...
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Transaction blocked by Blockchain [duplicate]

Payment was processed to me. Fees were requested to pay to sender. Transaction was unconfirmed and due to delay I was requested to pay the following fees to unblock transaction. Is this correct?
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1 answer
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Did Bitcoin founders know Bitcoin is not scalable at Base Layer?

Given Bitcoin takes 45 min per Transaction, and consumes lot of energy (around 1 million Visa transactions), https://digiconomist.net/bitcoin-energy-consumption/ This is more of a history question, ...
1 vote
1 answer
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What to look for in Bitcoin-core logfile when something bad happens

About a week ago I was trying to reorganise my file structure with Bitcoin Core, I accidentally moved the file before listing it as a backup so when I opened Core, it didn't work. I tried returning ...
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2 answers
190 views

If Lightning Network takes transactions off Blockchain, would that defeat the whole purpose of having a Blockchain ledger?

Currently Bitcoin transactions can take around 45 minutes. If everyone in the world uses Bitcoin, computers would have to consume 1000 of terabytes per Hour. The solution is the Lightning network, ...
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1 answer
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Can I see the workings (console) of my bitcoin full node?

I have just completed the IBD of my bitcoin full node on Bitcoin Core on Linux. When I open Bitcoin Core, i just get the basic wallet interface. It there anyway of seeing what the node is doing behind ...
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2 answers
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Will Bitcoin copy Best Features of Litecoin, Ripple, if its Open Source?

Proponents of Bitcoin always mention that Bitcoin is Open Source, so if any better cryptocurrency comes along, Bitcoin can just copy those features in their open source. Both Litecoin and Ripple have ...
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1 answer
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Balance in bitcoin-qt suddenly significantly diminished after a small transaction?

I had my wallet stored on a storage provider for a while, and recently got a new computer and installed bitcoin-qt and imported my wallet. It said I had about 2 BTC and showed INGOING transactions ...
2 votes
1 answer
395 views

51% attack, miners, nodes or both

If 51% of the hashrate was controlled by bad actors mining invalid blocks, this would become the longest chain. Where do nodes come into the 51% attack? The canonical chain is the longest chain. Is ...
1 vote
1 answer
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How much info share bitcoin nodes between other nodes?

1.If we assume bitcoin nodes share the other nodes addresses in the end every node know other nodes adresses right? 2.If we share data through network every node share the same information other ...
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How do nodes contribute to security when the power comes from mining and what is the chain of transaction validation?

Blockchain security comes from the decentralisation of hashing power by miners. They append transactions to a block, perform PoW and add them to the blockchain when that validate blocks. How do nodes ...
1 vote
2 answers
187 views

Can I find the address of my Bitcoin in the debug.log file?

I cannot download the entire block chain (I’ve tried four times now and failed) so I can’t replace my encrypted old wallet.dat file into the blockchain and do the rescan to check my coin balance. My ...
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3 answers
103 views

Can a full node understand the transactions it downloads from the Bitcoin network?

I understand a full node downloads and validates the entire transaction history. Can a full node read and understand these downloaded transactions, or is it just just keeping a copy of encoded ...
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1 vote
1 answer
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How are txns sorted correctly in Merkle trees between nodes and validated via Proof of Work

I am interested in exactly what happens to transactions in the pending block (block that is being mined at the time). From what I understand, transactions are the stored as a Merkle tree hash inside ...
1 vote
1 answer
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How to implement multiple wallet folders located out of the bitcoin blockchain folder?

After substantial research I could not find any solution for this seemingly simple implementation of the Bitcoin-Core app. Here is what I am trying to achieve: Running a full node on one computer ...
1 vote
1 answer
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What would be the easiest way to test the submitblock method?

I'm constructing a customized miner, and I'd like to check if the submitblock method would work properly when connected to mainnet. What would be the easiest way of doing that using RPC calls and ...
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3 answers
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Signing transactions can not find private key

Please I need help. I have made an transaction online using bitcoin, but the order cancelled and now my bitcoins are stuck. I've been using coinb.in the first time a while ago and was able to do it ...
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Is there a Blockchain Refund Department [duplicate]

I was scammed 3 years ago by FXTrade, i know for sure that they invested my money into BTC. About 6 months ago i recieved an email from a lawfirm that told me i had BTC to recover under my name in ...
1 vote
2 answers
119 views

How is blockchain not responsible for someone stealing my Bitcoin?

I'm new so please forgive me if I'm just not getting this. I have done nothing wrong. I did all the 2fa all recovery phrase I was told to do. I wake up to see 1200 dollars in crypto just gone from my ...

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