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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49 views

Block construction

I'm in the process or preparing a lecture on cryptocurrency and have studied dozens of sources. I have a pretty good understanding of most aspects of the bitcoin blockchain scheme. However, all of ...
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362 views

How to download bitcoin blockchain without core?

I tried to download the entire blockchain using bitcoin-core but i took about 9 days and eventually gone corrupted and i had to delete and restart. Any source to download through torrent or regular ...
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1answer
460 views

How Do They Get BTC Wallet.dat With Balance?

Going through YouTube, I found some videos on Bitcoin wallet.dat with balance. Looking at these videos, you will notice that these balances found in these btc wallet.dat are not on watch only ...
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1answer
79 views

Configure esplora to point to the bitcoind servers ip address - Part 3

Continuing on from this post: Configure esplora to point to the bitcoind servers ip address - Part 2 Trying to run cargo run --release --bin electrs -- -vvv --daemon-dir ~/.bitcoin, but it kept ...
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2answers
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How to transfer blockchain between two machines?

I have two computers A and B. A has a partial history of bitcoin blockchain (about 60% of entire history) which is not pruned (~120GB). I would like to transfer the history to B and run a pruned full ...
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2answers
111 views

How we can use Blockchain to prevent Plagiarism in scientific papers? [closed]

I have a research in "plagiarism prevention using blockchain" topic, and it is specialized in scientific papers. Anyone has any idea to help me through this topic?
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1answer
410 views

How do I get my Bitcoin “Spendable” instead of it being “Non-Spendable” on my Blockchain Account? [closed]

I have been fighting this all night and day and haven't made any progress. I used a CoinFlip ATM to buy BitCoin or deposit USD into the machine. I have an account at Blockchain and I used the right QR ...
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2answers
108 views

How Do Attackers Forge Bitcoin Blocks And How Do You Identify Forge Bitcoin Blocks? [duplicate]

I have read that a block contains several bitcoin transactions and an attacker can forge fake blocks. Does these forged fake bitcoin blocks cost the attackers money for mining or was it just ...
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1answer
65 views

Configure esplora to point to the bitcoind servers ip address - Part 2

Continuing on from this post: Configure esplora to point to the bitcoind servers ip address Trying to run cargo run --release --bin electrs -- -vvv --daemon-dir ~/.bitcoin, but it kept saying that ...
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2answers
80 views

How to check if a bitcoin address received a new transaction programmatically?

How can I check if a bitcoin address received a new transaction programmatically? Here is an example of the API call, but I can't figure out how to get the value of the new transation in API response:...
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3answers
325 views

How To Create BTC Raw Transactions With 0 BTC Wallet And Broadcast It On Blockchain Network? [closed]

https://www.youtube.com/watch?v=2NFMMNXyHNE I watched a YouTube video of someone that created several BTC raw transactions with 0 BTC Wallet and broadcasted it on blockchain network with valid ...
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1answer
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How do people using thin clients know the correct merkle path of transactions they've sent without knowing the full block?

User A send a transaction to user B. Those transactions are bundled together into a merkle tree. User A and B can both use the transaction plus the merkle root, plus the merkle path to prove the ...
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Sent bitcash to bitcoin coin address given by coinfy from my bit wallet can they trace funds and return them or is it impossible [duplicate]

Hi I sent bitcash instead of bitcoin to coinfy bit coin address they gave by mistake should of bitcoin.. it's completed hash tag etc.. I was told the mix up was from my wallet to them (being new to ...
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1answer
112 views

What does best block time mean in wallet.dat

I have a wallet.dat file that states: Best block at time of backup was 42603 (0000000013136bd812212959a15ef0ea0f084ee2c64e2f7f0e127d198f67a37f), mined on 2010-02-26T00:36:08Z Does that mean that one ...
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23 views

Noob question, how do nodes know about other nodes [duplicate]

I'm new to the p2p tech and I would like to figure out how it is working. How a new node knows ip addresses of other nodes, if there is no server? Writing classic software we usually hardcode a server ...
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1answer
40 views

Calculate Transaction Confirmations

I am writing an API for one of my systems which can verify if a monitored address is receiving Bitcoin, I can already check if the address is on the newly received block, save it to a database for ...
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1answer
55 views

block verification cost

When a node receives a block, is it enough to validate root of Merkel tree ? How does block size affect the validation cost? What is the difference between the cost of validation 1mg-size block and ...
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0answers
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Fork rate range in terms of network security

I am really new to bitcoin and am trying to understand the basics. Fork rate/Orphan rate is a measure of network security. The higher the fork rate, the more compromised the system. Also fork rate ...
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1answer
33 views

how is litecoin different from bitcoin [closed]

So far, i only know that litecoin is using another mining algorithm called Scrypt which has some ASIC resistance. Is there any more difference? Or they are completely the same except the mining ...
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1answer
45 views

How do i have a 2011 bch transaction?

I was under the impression that BCH did not fork untill 2017. How was i making transactions in 2011?
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1answer
195 views

How do I get wallet balance using xPub address with blockain.info api? [closed]

I am using blockchain.info api. I know how to get wallet balance using wallet id and password. Couldn't find how to find wallet balance using my xPub address.
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1answer
448 views

Unspendable bitcoins on blockchain [closed]

Gooday, please i want to know how to transform my non spendable bitcoins to spendable bitcoins on blockchain account for the sake of being able to spend them please someone help me out I'm lost. I ...
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1answer
47 views

Storing Provenance details in Bitcoin Blockchain

I am quite new to the blockchain and bitcoin world. I was looking at some ProofOfExistance (PoE) solutions (Digital Notary) for documents. While these solutions store the hash of document+timestamp, ...
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Double spending problem 2.0 [duplicate]

How is the following case handled in bitcoin blockchain? Initially Alice has only 2 bitcoins. Suppose Alice sends 2 bitcoins to herself(tr1 i.e. Alice to Alice) and then 2 bitcoins to Bob(tr2 i.e. ...
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1answer
37 views

How does bitcore-node get its data?

I'm trying to understand how does bitcore-node, the javascript implementation of Bitcoin protocol, get its data? Can it connect to Bitcoin Core, the original C++ implementation of the Bitcoin protocol,...
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1answer
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How do miners communicate in Bitcoin/ Decentralized Network?

1.)If there is no central authority maintaining database how miners differentiate among other miners. 2.)Do they have there own database which have details(Mac/IP address) of neighbouring miners . 3....
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3answers
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Can a miner just introduce a block full of valid predetermined transactions in the blockchain and get rewarded?

My question is - let's say a miner has control over a certain number of bitcoin addresses. He creates a block containing small transactions to and fro from these accounts ahead of time in advance and ...
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29 views

IBD problem: Reindexing blocks and syncing starts over every time I shut and open Core

I am currently doing IBD in segments due to logistical reasons, but each time I safely shut down Core and unplug my hard drive (HDD, 1TB) and then plug it back in and start up Core, it starts in 2009 ...
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34 views

Is there a way to know at any point in time T how many BTC exist that were bought at time t<T?

What I would like to find out is whether for a specific time in the past, we can know the number of BTC that exist today and were bought at this time. The discrete time can be the time of block ...
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3answers
71 views

Does the btc price depend on the reward?

Hey guys if you answer this question that I am keeping from months ill be happy. Does the actual bitcoin price depend on the mining profitability? So is it more profitable mine when the price is ...
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1answer
169 views

How to monitor Bitcoin address for new transactions?

I have some generated Bitcoin addresses which I want to monitor for newly received transactions, I have a full node but I don't want to import those addresses to the node's wallet. I don't want to use ...
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1answer
23 views

Improve uniqueness of block for nonce creation

I am going through online Blockchain course and in the course, they have mentioned that uniqueness of a block is defined using hashes with leading zeros as well as timestamp. Since, in the training, ...
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1answer
53 views

Problem with using blockchain for E-Shopping

I have a confusion with blockchain concepts. Blockchain is immutable. So we can have problems in using blockchain for shopping websites. Because if we use it for retail, people have a habit to return ...
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2answers
70 views

Does a trusted blockchain import from BitcoinCore require that chainstate and blocks be from the same source?

Can the chainstate folder from a pruned node be used with the blocks folder from a full node to provide the full blockchain? Assume that both nodes have been running for months. If the blocks folder ...
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1answer
76 views

What is the SPV Mining Exploit?

Can anyone explain this simply? I am not finding enough explanation exactly on this type of attack. If possible, add some additional reading to your answer so that I can understand more.
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2answers
504 views

When will I receive bitcoins

Today I sent bitcoin to my bitcoin core wallet. I used an address under recieve bitcoins. The transaction has been cleared on the blockchain for several hours but is not showing up in my wallet. ...
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1answer
57 views

Bitcoin not received since 3days now [closed]

Two different bitcoin payment was sent I sent into one Wallet Address requested, But only one came into my wallet successfully. But I am yet to receive the second one, and when I try to look it up on ...
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2answers
66 views

Will this bitcoin mining strategy work?

I'm new to bitcoin, and my knowledge of bitcoin is quite garbled and messy (I have only a vague understanding of Satoshi's original white paper for bitcoin......) I've been reading up on bitcoin ...
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0answers
98 views

Accidentally sent BCH instead of BTC to a BTC address (Block chain) [duplicate]

I've accidentally sent BCH from Coinbase to a BTC address of Block chain. Both accounts belong to me. Is there any way to recover it? Please help me.
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1answer
61 views

When does a miner get the reward?

Let's suppose that a miner mines a block and adds it to the blockchain. When it gets the reward ? I suspect that first of all the other nodes have to verify that its proof of work is correct and it's ...
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2answers
63 views

bitcoin back-end blockchain storage

bitcoin uses blockchain so blockchain is peer to peer, every peer stores the data so I wonder where does the data of all the bitcoins is stored? who is peer in case of bitcoin? so that peer gets ...
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1answer
46 views

What if the blockchain saved space by trimming input txs on each transaction?

At each block there is a determined set of unspent transaction outputs. Each new transaction specifies the unspent outputs it's going to spend in the format tx_id:output_index. tx_id is 32 bytes. If ...
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3answers
64 views

What are some good solutions for analyzing Bitcoin script patterns?

I'm interested in analyzing the Bitcoin blockchain for occurrences of particular scripts and spending patterns. What are some good solutions for this? An ideal solution would let me filter ...
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1answer
25 views

mining Blockchain Blocks

What if a miner starts to generate a new block hash based on trans data,latest block hash , timestamp and nonce , then in the middle of the work a new block has been added by another miner. in this ...
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2answers
49 views

How Bitcoin mining contributes to confirmations?

Based on my knowledge I know (maybe wrong) when a miner is doing hash, he is inputting any arbitrary values, in order to get a value that can be hashed into something with certain preceding zeros. ...
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2answers
58 views

How can I print these information using this library?

I want to know how through using this library I can print information about the current block that the world mine right now and I mean by that: Version, Previous Block, Merkle Root, Time, Bits, and ...
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1answer
201 views

Is the ordering of blocks in the rev*.dat files same as the blk*.dat files?

I understand that blk*.dat files save the blocks in the order it gets them from it's peers. Is the rev*.dat files in the same order as the blk*.dat files? For example, would the 400th magicbyte in ...
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What can blockchain do that normal databases systems won't?

Aside from cryptocurrencies, what advantages may blockchain(either public or private) have and real life use cases that can be more useful implemented in blockchain over traditional databases based ...
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1answer
47 views

Understand double spending through an example

Let’s suppose you have 1 BTC which you try to spend twice. You made the 1 BTC transaction to a merchant (Transaction T1). Now, you again sign and send the same 1 BTC on another Bitcoin address to try ...
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1answer
122 views

Fork and Longest Chain Rule

At the same time, A and B succeed in resolving the "Proof of work" challenge and both add a new block to their local blockchain, then they propagate the new blockchains to other nodes. I have 2 ...

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