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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Lost Bitcoins Help [duplicate]

years and years ago I invested in bitcoins and I also got some free for signing up somewhere and since then I have had a new phone and don’t even have that computer anymore so now I am unsure of how ...
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Why blockchain new node verify all transactions in blocks?

Hello I'm the student studying blockchain and bitcoin. I have a question that why all node verify all transactions in blocks. I check if new node connect bitcoin network, then the all transactions in ...
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How/When is mining reward given in the presence of forking / orphan chain?

I am aware this is related to this question. However, I am specifically curious about what would happen to the mining rewards, not the transactions, under a forking condition. As shown in the picture....
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I want to pre-hardcode my fallbackfee settings

I want to pre-hardcode my fallbackfee settings so that they are uniform across all wallet nodes. In which file should I put it, and not in bitcoin.conf?
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Bitcoin could work in principle with pen and paper and carrier pigeons. Could it?

Bitcoin could work in principle with pen and paper and carrier pigeons bringing the result of computations-by-hand back and forth to a public square: the ledger would work, but its intended use case ...
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bitcoin private key usage

My next question is how Private Key needed to spend coins. According to my understanding for transaction needed below steps: A wants to send 10 coin to B A make transaction example: from: A, to :B ...
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I've built a bitcoin miner and mined. Now what I do?

I've mined bitcoin to test and understand cryptocurrency better. Which generated this hash 00000431fb66ed96815b3829e975c2235a64b9a646c0bd1cc526dc1727c1f16b(nonce value of 300712) What I do with this ...
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When transactions of orphan block go back to the mempool?

Imagine there are two collision blocks A and B. These are mined at the same time. One miner created new block C on top of block A and longest chain happened. Do transactions of block B go back to ...
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Overflow bug bad chain length [duplicate]

Can someone recall how many blocks have been mined on the overflow bug chain until the new chain with the patch became the longer one?
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Where is my money, do i have access to it?

On 10/06/21 I tried to pay for an order with bitcoin. BCH. It went from bitcoin to blockchair to simpleledger:pzt39mmtjfs8trthwvvpq0v7ktjc4wyvyqtdpmf2eh, Transaction hash ...
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When one miner created a new block and won the mining race, what other miner do next?

Imagine that wee have 10 indexed blockchain. Now, I start mining for index 11 block referencing index10's hash, I mean, the last hash data. Also, other miners starts too. When other miner finishes ...
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If malicious person(node) tampered withone block transaction, what's gonna happen?

I understand that if one bad person(node) tampered one block of his/her blockchain, the block hash data changed completely different. Let's say each node has 10 indexed blockchain and index4 block has ...
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how do nodes agree or disagree after new block is create?

I'm new to blockchain field and I read one article. article In this article of Authorization chapter, it is said that "For a public blockchain, the decision to add a transaction to the chain is ...
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Will the bitcoin blockchain eventually grow too large to be able to be run 'by anyone'?

A key component of bitcoin is its decentralization (which effectively only exists with BTC and virtually nothing else). Part of this decentralization is the decentralization of the bitcoin nodes, ...
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Who are Merawing.net [duplicate]

Hello I have been contacted by this company saying about your withdrawal process. As I told you at the moment your funds are in the Blockchain system. With the help of artificial intelligence, we have ...
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Why Is it not possible to truncate the blockchain after Corruption detected

After running bitcoind (as part of myNode) for 6 monhths with no issue, I got this error: Fatal LevelDB error: Corruption: checksum mismatch: /home/bitcoin/.bitcoin/indexes/txindex/257701.log At ...
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How to find traitor in Byzantine General Problem

I am new to this problem and trying to understand it. For example if I have 7 generals, 4 of them are honest and 3 of them are traitors. Now, how do I know which 4 generals are honest generals because ...
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How can I -abort ./bitcoind -reindex-chainstate?

I made files re-accessible. Now we could return to a later, already synchronized state with the files. I tried to put ./bitcoind -reindex-chainstate=0, also in a bitcoin.conf, also directly calling ...
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Why there are signature and public key pair on blocks when transaction verifying is over

I'm student studying about bitcoin and blockchain. I want to know why all blocks have signature and key pair after the transaction is over. Why I ask this, I'm studying post quantum cryptography (PQC) ...
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How is transaction on exchanges that trade bitcoins connected to blockchain?

According to this answer, since the transaction on exchanges are internal, the transaction on blockchain is irrelated to them. But is the transaction on exchanges that trade bitcoins really not ...
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What prevents another node from sending an existing transaction? [duplicate]

To my understanding, when someone wants to send a transaction they will broadcast a message to the nodes that they are connected. What stops someone from sending a transaction that was sent to them ...
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Space of Bitcoin Blockchain [duplicate]

I am a beginner of Bitcoins. I read here that the size of the blockchain is heavy HUNDREDS of gigabytes. I also read that one of the reasons bitcoin is safe is that EVERY user keeps a local copy of ...
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Changing the blockchain requires more than just recalculating all hashes..?

New here! I read this everywhere - "To change some data in a blockchain, the malicious user will have to recalculate hash for every block starting from that particular block". My doubt is - ...
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Do Wallets need to be verified or activated? Crypto Support asking me to do that [duplicate]

1.5Bitcoins were stolen form me in 2019, and a company Merawing contacted me a few weeks again, saying that they work with Crypto Regulation of Cyprus and that they would help me getting my bitcoins ...
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Why is the rate of reindexing chainstate not constant?

What determines the speed of the reindexing-chainstate in the different times? I spend a few days (2 week) for reindexing locally on my new HDD, and I noticed one thing: the speed of reindexing is ...
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Where can I download the bitcoin blockchain to do offline analysis?

Where can I download the bitcoin blockchain to do some offline analysis. edit: Ideally I'd like to download .txt (or another file extension, e.g. .dat, as long as the contents are unencoded and human ...
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Crpyto Bitcoin Insurance

How will the Bitcoin Crypto market compete against theft, if other fiat currencies have similar to FDIC insurance? In this article, some thieves did a phone swap, got a two factor authentication code,...
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How can 51% of nodes validate blocks while some are inactive?

Suppose a node doesn't have an internet connection. Since it would not receive the broadcast of other nodes, does the blockchain then propagate without the validation of that node? (That is, is it 51% ...
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Why discrepancies in blockchain GB size between Mac and web sources?

On a Mac which Bitcoin Core updated a few minutes ago, the the Blocks folder contains 409.55 GB and the Chainstate folder contains 4.57 GB. But... https://www.blockchain.com/charts/blocks-size shows, ...
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How can I get RawTX transactions?

I used to be able to get RawTX transactions on the Blockchain using the link: https://blockchain.info/tx/60183ab915f2f4b0190605f98bd0e9f8eafe13a1c902b3ae87ecd0dfc8a599a0?format=hex But the site ...
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Do I have a chance to commit a transaction without any network fee?

I know how transaction fees are calculated. Also I understand that a transaction with a higher fee will be approved much faster than a transaction with the lowest one. Does the bitcoin protocol allow ...
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How many blocks extra does one need before it's competitor is deemed stale?

so when two equally valid blocks are discovered at roughly the same time, a conflict occurs, nodes should wait for the strongest fork of the chain to emerge and develop before placing trust in the ...
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How do I use Bitcoin Core (fully synced) to "backtrack" a receive address?

I'm trying to "reverse-track" my current Bitcoin wallet to see its exact history on the blockchain, backwards. I have a fully synced Bitcoin Core installed. What command do I use in its ...
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Why .bitcoin is at /root in Arch/Manjaro Linux?

I've installed bitcoin-core and downloaded the blockchain in Ubuntu. Now that I have switched to Manjaro Linux and installed bitcoin-core again, It creates the .bitcoin directory in /root/.bitcoin/ ...
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How to merge the datadir with .bitcoin directory?

I changed the path of datadir in bitcoin.conf from .bitcoin directory to somewhere else. Now that I need to backup my blockchain data, I want to have both .bitcoin and blockchain data together. ...
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How bitcoin exactly works?

Everyone says, Bitcoin is decentralized. No central server is "hosted the app" But no matter how hard i am trying to get a grasp of it, i still couldn't understand how it works for exactly ...
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Power outage during Bitcoin Core initial synchronization

I had a power outage when I was half way through my Bitcoin Core initial synchronization. Is there a way to pick up where it left off or do I need to start over?
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Already mined block hash showing zeros at the end when I hash it in online sha256 two times

Hi I tried hashing a already mined block with this block header ...
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My transaction is in review for over 24hrs on blockchain, I want to cancel it

Please I want to cancel my in review transaction on blockchain. How will I go about it. Please help me,I need answers as soon as possible.
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Can the minimum transaction with bitcoin (satochi) be updated to even less? [duplicate]

Or is it not changeable by design ?
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If the prices of virtual currencies on multiple platforms are different, can you buy low and sell high to make a profit? [duplicate]

I have observed that the prices will be different, can I earn the difference?
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Does Bitcoin-core support creating a new Bitcoin blockchain?

My goal is to add a new feature to Bitcoin, which requires changing the structure of the Bitcoin blockchain. So I was wondering if Bitcoin Core supports having a new/own Blockchain? If so, how to do ...
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Help analyzing this color coded hexdump of the Bitcoin blockchain

Sample of genesis, growth, and current height Sample of the latter part and the end of blk02655.dat. This probably covers parts of the last 10000 blocks. Process here: https://twitter.com/...
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Suppose crypto is adopted globally, and 100 years pass. Where would 100 years worth of global transactions/smart contracts be stored? [closed]

To my novice understanding the blockchain is stored on all participating computers in the network. Is this to say each computer has the entire chain downloaded onto the hard drive? Or do we merely ...
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Bitcoin BTC wallet receive addresses

I want to create 100 to 500 to 1000 BTC receive addresses. It should not expire. Is it possible ? Is it possible in Bitcoin core ?
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What if a pool of computers are used to attack a blockchain and modify it in 51% of the network? [duplicate]

I mean if a large computer pool is used to attack a blockchain and modify the copy of the blockchain in 51% of computers in the network. Then due to consensus, the faulty blockchain will be replicated ...
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Says "confirmed" but never received [duplicate]

I sent someone bitcoin through cash app and it says confirmed but the recipient said they never received it, is there a reason this could be happening? Or is there a way for me to get it back from the ...
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Blockchain not letting me send all of my bitcoin (Please help) [closed]

I've been using blockchain for the past couple years and i have received lots of transactions (daily) for the past time. Today i decided to have them transferred to a Trading app which I've always ...
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Noob question: Why is there not a limit of the number of blocks in a chain revision?

I have a noob idea and I want to understand where I'm going wrong :) Say nodes agreed on a block revision limit, say, 6. This would mean that if they see an incoming chain that is longer than the ...
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fatal error using Win Bitcoin core to create node

It ran about 10 hours, loaded 70% of blockchain, now always this error in debug.log on restart 2021-06-21T14:11:58Z ERROR: ReadBlockFromDisk: Errors in block header at FlatFilePos(nFile=1801, nPos=...

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