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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60 views

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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3answers
105 views

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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510 views

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 ...
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Payment sent not received by receiver as per him its redirected to mempools back wallet

Payment sent not received by receiver as per him its redirected to mempools back wallet. status shows confirmed on blockchain but showing unspent. what does this unspent mean and does it get reversed ...
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2answers
105 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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2answers
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How Bitcoin restricts the mining time?

How Bitcoin restricts the mining time? We know cryptocurrency systems restrict the mining time of a block to a certain limit for security reasons. For example, mining time for Bitcoin is ~10 minutes. ...
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0answers
17 views

Is bitcoin mining mostly a losing game for individuals? [duplicate]

I've just read about the new ASIC chips and how people are keen to get them. I assume whoever sells the chips would have made huge profits for years by now. The more miners start using these faster ...
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1answer
79 views

Are the blocks in blkxxxxx.dat files ordered by block height?

I'm parsing out de blockxxxxx.dat files for the bitcoin blockchain. Are the blocks ordered by height? So is the order of the data for everybody the same?
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1answer
140 views

I have an old blockchain wallet and a .txt file of 43 words, but the site wants 12 words?

I have a wallet.aes.json file and a .txt file that contains 43 random words. They were both made within minutes of each other back in early 2014, and my confirmation emails from blockchain are also ...
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0answers
77 views

What's up with the block size of block# 295182?

I found an anomaly in the block size data: block 295182. This one seems to have a way higher payload. What happened there? Or is this there something wrong with my parsing? This file block does ...
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1answer
25 views

Are blocks stored in blkxxxxx.dat files per line?

Simple question. Is each line in a blkxxxxx.dat file a block?
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2answers
239 views

Is Bitcoin safe from 51% control with Billionaires? [duplicate]

Is bitcoin really safe from control and drastic rule changes? For bitcoin to change its protocol, 51% of nodes holders have to vote to modify it. They say 26 billionaires own as much as world's 50% ...
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1answer
42 views

Why is data stored in reverse in the blockchain files?

I'm parsing the binary data from the bitcoin core blockchain blkxxxxx.dat files. If I read out the magic number I get this: \xf9\xbe\xb4\xd9\ Why isn't it stored the other way around, as the magic ...
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1answer
72 views

Discrepancy in the blockchain size

There are approximately 700,000 blocks as of March 2021 [1]. How comes the blockchain size is only ~350 GB [2] and not 700 GB given that the block size is 1 MB? Thank you for your help.
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What is the best way to pull miner's fee associated with a list of transactions?

I have a spreadsheet containing the transaction ID, datetime, and BTC amount of 800,000+ transactions associated with a BTC address (includes both sent and received transactions). Now I am trying to ...
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1answer
51 views

Why does mining / validation of new blocks have to be complicated / time consuming? [duplicate]

Why does mining / validation of new blocks have to be complicated / time consuming ? Why it can't be as simple as just find a hash for a text? Is it just to control / limit the amount of new crypto ...
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1answer
96 views

What happens if I lose Bitcoin Investment, is there Bitcoin insurance?

If fiat bank money is stolen, or bank is fire/damaged, we have banking insurance. If hard money gold is stolen, it can always be replenished with Lloyds of London insurance, or with a mining annual ...
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44 views

the two miner type of reward [duplicate]

The definition of a block in the blockchain is "A block records some or all of the most recent Bitcoin transactions that have not yet entered any prior blocks. Thus, a block is like a page of a ...
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1answer
49 views

Does the miner machine get any other type of reward except confirmation of transaction in bitcoin?

Does the miner machine get any other type of reward except confirmation of transaction in bitcoin?(The answer precedes ​another question)
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0answers
52 views

BlockChain.Com Wallet - Why transaction FEE Is very HIGH

I have two wallets in BlockChain.Com web site. When i want to transfer bitcoin from one of them situation is like this : Money for transfer : $1000 Transaction Fee = Priority = $26 In another wallet ...
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1answer
147 views

Blockchain.com wallet | 1178$ transaction with low fee = 10 satoshi | How fix unconfirmed issue

I have a blockchain.com wallet. yesterday i did a big mistake : I customized transaction fee and set it to 10 satoshi. Here is the tx link of that transaction. Now after 1 day it has n't confirm. Did ...
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0answers
37 views

Looking for feedback on (Browser-based) Blockchain Simulator

I have created a Blockchain 'simulator' in JavaScript, for the purpose of helping explain how the technology works. It is complementary to a website I have set up years ago, where I attempt to explain ...
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2answers
72 views

How could I make my own API to query the blockchain

I'm looking to access transaction history for some specific coins directly from the blockchain. The main reason is that most of current API are not free or don't provide information for the coins I ...
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1answer
58 views

How to add new btc block to blockchain [duplicate]

Please let me known that "How I add a new BTC block to blockchain?" as a sole miner.
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1answer
18 views

generating random pair key has standard?

If a crypto wallet generates all pair key between small range for example between 1-100, the risk and possibility of creating the same key is an increase. Generating random pair keys for ...
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1answer
73 views

How is the Max Target of a Genesis Block Decided?

I've been diving into the world of Blockchain and crypto lately, trying to build my understanding of mining specifically. I understand that in POW systems, the difficulty of the first block is 1, and ...
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1answer
45 views

Bitcoin was sent to my wallet 7 days ago but it has not reflect in the wallet [duplicate]

I checked the bitcoin explorer to check if the bitcoin is in and Yes it is but it stays unspent but it has not reflect in the wallet of the main address for 7days now ...
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1answer
129 views

Why don't bitcoin nodes invalidate new blockchains that don't contain all the data of the old blockchain?

If nodes only accepted new valid blockchains that contained all the data of the old blockchain, then miners will still be able to add blocks to the current blockchain because their blockchain will ...
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1answer
51 views

I can not find a clear mathematical proof method with details and example for "near to zero chance of generating the same pair key wallet"

A mathematical proof method with details for "near to zero chance of generating the same pair key wallet" I can not find a clear mathematical proof for the top sentence with example
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12 views

Does the protocol ensure that pair keys wallet are unique? [duplicate]

What mechanism for proof unique pair keys (public key and private key) when creating a wallet with several sources(such as "wallet.btc.com", "wallet.bitcoin.com", "www....
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0answers
28 views

bitcoin-etl: problems with installing

I am trying to install bitcoin-etl: https://github.com/blockchain-etl/bitcoin-etl to analyze bitcoin blockchain. I have Mac OS and python3, I run this in terminal: pip install bitcoin-etl Also tried ...
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1answer
70 views

Adroid Blockchain wallet ver 4.0.12 recovery

Just repaired my old Android phone, with Blockchain wallet version 4.0.12. It is asking for either the four digit PIN or the password, which I have both forgotten. Is there any way to recover this now ...
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1answer
82 views

Why aren't public-private keys sufficient to build a block chain? Why do we need proof of work/stake?

Taking the simple case of Bitcoin here: If all nodes can validate published transactions by checking the signature (created using the private key of the sender) of the transaction against the public ...
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4answers
132 views

If the computer that stores the bitcoin is destroyed, how does someone access their bitcoin?

I have seen people say that you just need the private key and "some software" to recover your bitcoin. What does this actually mean in the real world? Can someone give an example? Also, if ...
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2answers
217 views

Blockchain transaction verification

I watched the 3Blue1Brown video about the blockchain and a question arose. How is it ever guaranteed that if I send out a broadcast it will ever be put in a block that gets verified. For example it (...
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1answer
16 views

Possible To --enable-wallet After Syncronization With Blockahin?

I am running bitcoind from the command line (--without-gui) and my system apparently does not have the correct Berkley DB version (4.8+). Therefore, I chose to run the program without the wallet ...
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1answer
56 views

Preventing secretly mined chains

In order to prevent attackers from secretly mining chains (which they could later publish to perform double-spending attacks), would it be possible to require some information to be included in the ...
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0answers
50 views

Sent money from Bitcoin Core to mobile Electrum and for 3 days can`t recieve it

3 days ago I made transaction from my Bitcoin Core to my mobile Electrum but I didn't receive any money yet. I can't see this transaction in Electrum and on Blockain,Tradeblock either, however, ...
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0answers
28 views

RegTest Genesis Error

how to generate regression test genesis block ? i saw in bitcion nonce is 2. but i generate from GenesisH0 it not showed nonce 2. for other altcoin i saw nonce is 0 why ? how to generate it ? python ...
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3answers
337 views

How does the blockchain resolve arbitration issues?

I understand that a bitcoin wallet is nothing but a transaction record performed on the block chain. How are transaction details updated in the decentralised block chain? In a centralised system a ...
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1answer
134 views

What's the advantages of using the block chain as opposed to L2 solutions

I'm looking for a good example and explanation from a software architecture perspective BUT for general audience about the benefits of solving and having blockchain features on Layer 1 not ...
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1answer
42 views

How to split fee between more than one miners?

I found that some BTC blocks have more than one miners, for instance: https://www.blockchain.com/btc/block/000000000000000049a0914d83df36982c77ac1f65ade6a52bdced2ce312aba9 there are two miners: ['...
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1answer
459 views

Blocks from before the genesis block

How do we know that there are no blocks that predate the genesis block? A block that could potentially contain any number of coins. If somebody already created such a block from before the genesis but ...
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0answers
30 views

bitcoin-cli sendmany but not shown explorer

I sent bitcoin to 93 people with sendmany function. It made a tx id = "abc7f3f878fe0fff59bd295ea1a7f86c4a13f1ea8bbd3eb52629f040d06069b4" but I couldn't show in bitcoin explorer. I ran ...
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1answer
152 views

Can a unconfirmed transaction be lost or modified?

I am beginner and I am still learning fundamentals of block and bitcoin network. Suppose, I do a transaction on bitcoin network, it is marked as unconfirmed transaction and is stored in mempool of ...
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0answers
12 views

Computation expenses of syncing / getting a full node up and running, hardware considerations

Since a full node needs to process the entire block chain from the beginning and it keeps getting bigger this requires more computing resources over time. Does it seem more likely in the near future ...
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1answer
148 views

Trying to understand the mempool and how transactions are picked

I am very new to blockchain and try to understand it completely. What I think I understood is, that every transaction is going to the mempool first and these transactions are getting picked by miners. ...
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101 views

Final Balance -Balance showing different then Coinspot BTC wallet

Bit of a beginner question I have been using crypto wallets for a few months and have basically learned through trial and error. The question is my BTC wallet on Coinspot has a $0 and 0.0 BTC balance. ...
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2answers
64 views

What prevent someone to not use the receiver address of one transaction as the sender in another one?

Title may be confusing you, and to be honest I am also confused how things work and I am new to this crypto world so sorry in advance if I am not using the correct words. I try to explain : Let say ...
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0answers
29 views

Unconfirmed tx with blockchain [duplicate]

It’s been a month now and my tx still is unconfirmed. I know it’s because of my low tx fee. I tried using Viabtc and paid them a fee of $117.00 and nothing happened. I’m still stuck waiting not ...

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