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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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Hi can someone help me with this btc transaction?

https://www.blockchain.com/btc/address/17GNYZZ9y1Woyv5JdqLcAEJeYaQyRDTx2D it is not showing up in the bitcoin account it should be in????? Blockchain and electrum as my personal wallets, but this ...
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2answers
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Is the time taken for the verification of a transcation not much relevant?

By verification I do not mean the puzzle solving/hash calculating part but the part involving searching all of the blocks to check if the transaction is valid or not? For example if A transferred ...
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0answers
15 views

How do I include mining in this alternative Blockchain application of mine?

I am making a blockchain based messaging application. How it works is like this: there is a server side program and a client side program. The clients are the nodes which have a Public and Private Key ...
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2answers
64 views

Why is the value field 8 bytes in transaction output when it can be achieved with 7 bytes?

Bitcoin uses a 8 bytes value field in the transaction output. However, the total supply of bitcoin is capped at 21M. Theoretically, even if all the 21M bitcoins are transferred to a single address, ...
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2answers
62 views

Checking if a receiver has enough coins

How do miners verify the blockchain transaction history to check if the sender has enough money if the address can be changed at any time?
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1answer
33 views

How chaining the blocks protect against altering data?

I am confused with the block chaining, as i know a block header contains a reference to the previous block header hash with the merkle root and other fields. This header hash is related (computed) to ...
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1answer
383 views

If the nonce is 32 bits why the proof of it is difficult?

I want to know why mining of nonce is difficult? The nonce is 32 bits (4294967296) and a high level Nvidia graphic card can check and mine it in a second. why do we need a pool to mine a blockchain?...
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11 views

Does Bitcoin security rely on the assumption of nearly continuous transactions? [duplicate]

So for an attacker not to overcome good nodes, I believe we rely on the fact that blocks are always being produced, making the attacker essentially outpaced. But in the extreme and ridiculously ...
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0answers
25 views

How the process “ lock a certain amount of coins into the network as their stake” achieved technically in the Proof of stake algorithm

i am trying to understand deeper the proof of stake algorithm. i think i understand the basics but i am struggling to understand how this achieved thoroughly under blockchain network and how the nodes ...
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0answers
8 views

Is rippled release the rpc connect resource? The service is unavailable

I have deployed a ripple sync node, and monitor its' height and parse the latest closed ledger by rpc method ledger_closed and ledger. Usually I have lost my connection, because the rippled server ...
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1answer
27 views

When does miner insert the coinbase transaction?

When a miner creates the candidate block with transactions from the mempool, does he insert the coinbase transaction after winning the PoW or during PoW?
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29 views

How does the Blockchain detect a cheater, who manipulates the blockchain?

Let's assume we have 100 blocks. One miner x has the intention to manipulate block 90. So he has to recalculate the hash for block 90. Following he also has to recalculate the hashes for block 91-100. ...
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46 views

should i can use my coinbase 12 backup phrase into blockchain wallet?

i have one question in my mind i can able to recover my wallet of coinbase using 12 backup phrase into blockchain wallet it will be accept it? and restore my all crypto of coinbase into blockchain ...
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1answer
55 views

What is the fastest way to research Bitcoin block chain?

I would like to do some research of the Bitcoin blockchain. Because i would like to do massive amounts of processing and lookups, I need a fast way to search the blockchain. Http requests to insight....
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1answer
34 views

How to model randomness in validators selection in PoS?

I searched a lot here and on the Internet to figure how how randomness selection of validators in PoS works? I understand it is a random selection based on fraction of stake a validator has, similar ...
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1answer
21 views

Proof-of-Stake: What if a bad enactor is chosen by random?

My understanding of proof-of-stake is the following: The node that mines the next block is chosen, randomly in proportion to the amount of nodes they have in the network (ex. person who who owns 5% ...
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1answer
29 views

Data for time a transaction spent in a pool before it got added to a block

Is it possible to collect data for when an transaction was added to the pool to when it was added to the block?
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1answer
33 views

Is it possible to store data privately into the bitcoin blockchain?

Given that Bitcoin is a public and permissionless blockchain, does this mean that any data stored in it will be free for anyone to see? Is it possible to store documents such as screenshots etc.?
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1answer
44 views

Bitcoins didn't arrived

3-4 days ago, I transferred bitcoins from Virwox to my Electrum wallet, but this bitcoins didn't arrived, what can i do? 1JPSVx7hjcu7rR2Vr6nyz7z8mok3yryGZ
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0answers
37 views

How to generate multiple ripple address from single mnemonics?

console.log('mnemonic: ' + mnemonic) console.log('mnemonic: ' + mnemonic) const seed = bip39.mnemonicToSeed(mnemonic) const m = bip32.fromSeedBuffer(seed) const keyPair = m.derivePath("m/44'/144'/0'/0/...
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1answer
42 views

Signing a blank input?

Is it possible to include a blank input in a transaction? For example, a blank input could be used to guarantee a particular output was included in a transaction, using SIGHASH_SINGLE | ANYONECANPAY ...
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0answers
28 views

Can the blockchain be imported into wallets of different brands?

Can I import the block chain that bitcoin core downloads to use in any of the other full node PC wallets? Are the formats the same or inter-convertible?
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30 views

Outputs only from bitcoin address

I just want to ask is there any way on how to extract ONLY outputs from particular bitcoin address. I need to export (make a list) on all address that were associated with the outputs from the sender ...
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1answer
32 views

Reward in case of fork

Hi I would like to ask you guys for some details about getting reward from minning block when there is a fork - two miners get different blocks at the same time. Both of these block will have the ...
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1answer
48 views

bitcoin difficulty determination

Given the bitcoin difficulty information in https://bitcoinwisdom.com/bitcoin/difficulty, determine the bitcoin difficulty on April 1, 2019 and April 1, 2020. State any assumptions made in this ...
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2answers
44 views

how to generate bitcoin adddres using seed?

Hi i am new to bitcoin all i want to know is how to generate address using mnemonic seed? let testnet =Bitcoin.networks.testnet; let keypair =Bitcoin.ECPair.makeRandom({network:testnet}); let address=...
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1answer
36 views

Bitcoin fork resolution - Fork losers download previous blocks 'til common block?

When resolving a naturally occurring fork in Bitcoin, do the miners who were working on the orphaned fork download previous blocks from the miner who won the block reward that resolved the fork until ...
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1answer
61 views

How do miners know how to remove recently confirmed transactions?

A miner is in the process of creating and mining a block of 1400 transactions. Suddenly they receive a broadcast that a new block was confirmed with 200 of the transactions currently in that miner's ...
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2answers
49 views

Bitcoin checks and balances

When a new block is created, does each block need to be validated? How does it differ from validating transactions? Why miners would waste time validating transactions and blocks when they could ...
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1answer
31 views

Bitcoin optional fees create transaction ordering problems?

I've tried to find a solid answer to this transaction ordering question and the practical and technical issues that do not seem solved. My understanding is that after I create a transaction, I can ...
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1answer
51 views

Expected property “0” of type ECPair, got p

When I'm trying to create a wallet in react app using the following code: const seed = bip39.mnemonicToSeed(mnemonic); const master = bitcoin.HDNode.fromSeedBuffer(seed, "testnet"); I got error: ...
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0answers
58 views

problem in imported address

I have $10 at my address. I only imported that address in my other wallet, but it shows the balance of $0 and no past transactions. I tried my balance address of $18 and the same zero balance is shown ...
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0answers
86 views

api limit workaround

Are there any ways to avoid limitation for api calls (5/sec)? I need the info about transactions and balance (of certain account), UTXOs and the ability to broadcast my transaction. Currently I am ...
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2answers
20 views

Calculating height of block

How do I calculate a possible height at which a block should be mined some time between 2 given times (say 8:00 am - 10:00 am)?
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0answers
21 views

Question on Blockchain-Based Data protection framework research paper

I am reading the paper Distributed Blockchain-Based Data Protection Framework for Modern Power Systems against Cyber Attacks. I am unclear if the data transmitted by the smart meters to the blockchain ...
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1answer
27 views

51% attack + ignore blocks not mined by yourself [duplicate]

If you own 51% of the mining power and decide to ignore all blocks not mined by yourself. You would eventually end up having the longest chain, and would eat up the 49% of block-reward you werent ...
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1answer
44 views

Blockchain is losing me money with every transfer

I'm losing up to 45% on a BTC transaction. When it reaches the merchant they say that I'm losing it in the transfer and that the chain is the cause. How true is this and how can I check with the chain ...
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1answer
23 views

What is meant with 'the highest PoW'?

What is meant when the nodes select the chain with the highest cumulated PoW? How is the highest highest PoW calculated? I thought the concept itself is called PoW.
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29 views

How to most efficiently keep in sync blockchain on offline computer (including through bitcoin-qt upgrades)?

I have bitcoin-qt running on online computer. I want to: copy blockchain to offline computer (preferably using WORM media for security reasons) from time to time update offline copy with newest ...
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0answers
23 views

Parse BTC transaction Input and output addresses from blockchain [duplicate]

I am experimenting with parsing the blockchain using rusty-blockparser. I am wondering if it is possible to parse large amounts of transactions/blocks, resulting in the input addresses and output ...
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3answers
108 views

Where is the data stored in Bitcoin?

Is all the data related with the transaction of bitcoin stored in blockchain or the data stored somewhere in the cloud and they are referenced from blockchain. I have this confusion because if we are ...
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1answer
40 views

Unconfirmed transaction. Please help [duplicate]

Please help. Probably I set fee too small and now I wait 10 hours so far and transaction is not confirmed yet. Is there anybody who can help speed it up ?
3
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1answer
55 views

Are Bitcoin core devs contributing to ISO/TC 307 Blockchain and distributed ledger technologies

I was just being made aware of the standardization process about blockchain and distributed Leger technologies. https://www.iso.org/committee/6266604.html In this picture from the talk that I am ...
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1answer
44 views

Transfering btc from blockchain to electrum wallet, still unconfirmed

i transferred btc from blockchain to electrum wallet. it has like 132 confirmations but on blockchain it's still Pending: 0/3 Confirmations Status. I paid fee and everything. Is this something normal ...
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27 views

Where can I crawl some smart contract data on Bitcoin?

I have to collect some real-world smart contracts from different platforms. I can find the real-time transactions and blocks of Ethereum from https://etherscan.io/. But where can I find the data of ...
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1answer
48 views

How do I make my coin seeds?

I want to add DNS seeds – like bitcoin – to my alt-coin. Is bitcoins generate-seeds.py and makeseeds.py the scripts to register DNS-seed ips?
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1answer
55 views

litecoin-cli: how to get block's txs?

Hi I am querying via rpc litecoin-cli. There are some differences from bitcoin-cli that I immediately found and can't figure out how to know : txs, outs, ins fees/txs: min, mid, max of the block? ...
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0answers
41 views

Blockchain.info confirmation misunderstanding

I have some misunderstanding regarding how confirmation work on blockchain.info. If we go to payment history we can see info about confirmation in two places. First in history of all transactions. ...
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1answer
45 views

What is off-by one error in updating target? How is it fixed?

Can some one explain completely what off by one error is? how is it fixed?
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34 views

Locating Bitcoin mining activity

There is any systematic way to locate Bitcoin mining activity (either block creation or node activity). I stumble upon with Bitnodes code which implements a recursive search using some nodes as "seed",...