Questions tagged [block]

This tag should be used for questions related to Bitcoin blocks

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49 views

How does the difficulty target affect the time to complete the block? [duplicate]

So, I'm currently doing a personal project where I'm creating my own crypto blockchain (just for fun). I'm currently coding the Difficulty Target part of the Blockchain, but I'm not entirely sure how ...
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1answer
272 views

Bitcoin transactions over Ripple Network

I am interested in using the ripple network in conjunction with bitcoin transactions, but am curious as to interplay between the ripple ledger verification and the bitcoin blockchain verification. I ...
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0answers
25 views

Is it true that the rate of finding a new block is constant, but just that the bitcoin reward become less and less? [duplicate]

Can somebody ELI5? Is it true that every block that is discovered, the person that discovered the block will be awarded 12.5 bitcoins? But to discover such a block, somehow the person has to get a ...
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1answer
32 views

creating your own bitcoin block

I've just started reading about bitcoin, and I had this question, what if : I created two bitcoin addresses. added for example 1 btc to one of them. then I start sending that 1 btc back and forth ...
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2answers
92 views

1 MB Block Size as a Anti-DoS Attack Measure

Wikipedia explains the rationale behind the 1 MB block size limit as follows: The one megabyte block size limit was added in 2010 by Satoshi Nakamoto as a temporary anti-DoS measure A SE post ...
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0answers
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unconfirmed transaction 1/2fdlhhxj [duplicate]

I have seen a transaction in my wallet that was not made by me how can I stop it please it’s still on 1to6 unconfirmed
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1answer
32 views

Do all of the records in the same block share the same hash?

From what I have read, when a transaction is settled, the record is added to a block among with other records. The block is given a new hash as well as a hash from previous block. So does that means ...
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2answers
79 views

Does bitcoin mining pool hash randomly and separately

When it comes to hashing does each mining entity use total random seed for each of their hashing function or do they have a range like " Im gonna cover from 0 to 500, and you cover from 500 to ...
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2answers
196 views

Why are block header bits necessary? (Valid difficulty is already implied by chain history)

Difficulty or target is implied by chain history, so why does it need to be explicit in the header? I suppose it exposes miner-intended-difficulty, but I don't see why that would be relevant without ...
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1answer
1k views

Do Miners get a reward for re-confirming blocks?

As far as I know, to ensure double-spending didn't happened and also for other security reasons, there is minimum number of confirmations that a transaction should have to be accepted. That value is ...
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1answer
111 views

How do I call getblocktemplate from C#'s bitcoinlib?

How do I call getblocktemplate from the bitcoinlib package for C#? This call does not work ICoinService CoinService = new BitcoinService(useTestnet: true); var blockTemplate = CoinService....
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Block with a smaller height mined after blocks with higher height? [duplicate]

According to the Timestamp: 2020-11-05 16:03 of the block 655534, this block was mined before after the subsequent block: 655535 Timestamp: 2020-11-05 15:31. How can this be?
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1answer
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Why is the block size so big, taking into account a relatively small number of transactions?

Why the size of the block 656143 is so big (Size: 2,337,727 bytes), taking into account a relatively small number of transactions (Number of Transactions: 84)? Extra question: What is the block size ...
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1answer
62 views

Question regarding stale blocks and the heaviest chain

According to this website: https://forkmonitor.info/stale/btc/644543, at the block heigh 644543 multiple blocks were produced. If I understand correctly, in Bitcoin, the heaviest chain survives, while ...
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Upgrading - OLD PC - Wallet v0.8.1-beta and qt v4.8.3

Can you advise me on upgrading my wallet and bitcoin software. Are there files I should save before upgrading? what should I upgrade to? Other basic questions. I have a number of bitcoin files in my ...
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1answer
65 views

How bitcoin network appends new block in its Block-chain

Well, According to my research, After solving the cryptographic hash, when the multiple nodes broadcast the block at the same time as a suggestion to be the next block in the chain. Bitcoin network ...
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1answer
88 views

What pools will allow asic block erupters these days? [closed]

I'm a Ubuntu cgminer/bfgminer guy and purchased 6 asic block erupters and a newbie to mining. Could never get into slushpool, but have been mining for poolin for about a week and really don't see any ...
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1answer
97 views

Which blk*.dat file contains a particular block?

Is there a way to find out which blk*.dat file contains a particular block? For example, it would be useful to know which *.dat file contains block 478558, which is the point where BCH forked from BTC....
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47 views

What is the total number (or rate) of orphaned blocks in Bitcoin in 2020?

Apparently, blockchain.com stopped to provide such information in 2017. Obviously, we still have orphaned/stale blocks in Bitcoin (see, e.g., BitMEX Research: Bitcoin Has a Stale Block For The First ...
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1answer
87 views

Is every copy of the blockchain the same? If I have an error within file should I be able to copy this file from a backup and reindex chainstate?

I recently moved the first 2000 files of my blockchain from the SSD to a HDD. The HDD gets mounted in /mnt/ext. A symlink per file is then put into blocks that points to the remote files. So my blocks ...
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2answers
124 views

Why does the txn_count field exists in a block?

I was wondering why the txn_count field in a block exists. The count of transactions could be determined by parsing the txns field in tx format, right? Same for 'tx_in count' and 'tx_out count' in a ...
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0answers
19 views

Is it normal that blk and rev files are blank?

I am trying to run a full node on a Raspberry Pi 3. My computer is also not so good for initial block download. So I got a borrowed computer and synced the whole blockchain overnight. Then I copied &...
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2answers
145 views

What are the benefit of mining an empty block

Something peculiar just happened on the newly mined block number 655534, it contain only the coinbase transaction, nothing else. I have searched for a similar question but only found this one Why ...
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0answers
18 views

How much does a block's recorded time differ from the actual time that my node first sees it? [duplicate]

A block has a "time" and a "mediantime". Is it correct that the "time" is supposed to generally reflect the real time the block was mined and broadcast to the network? If ...
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bitcoin-cli getblockchaininfo "blocks": 0 "headers" 0

Noob question. I've been following the raspibolt set up (https://stadicus.github.io/RaspiBolt/raspibolt_30_bitcoin.html), but I'm stuck trying to get the initial sync started. It is active (running) ...
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1answer
95 views

Is a timestamp in bitcoin different than just the "stamp of time"?

In the "References" section of Bitcoin's whitepaper, Satoshi Nakamoto points to three papers that serve as inspiration for digital timestamping. When you read those documents it is clear ...
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0answers
127 views

Attacker Changing Address to Receive Block Reward [duplicate]

A miner creates a block B which contains address α, on which he wants to receive his rewards. An attacker changes block B, such that instead of α it defines a new address α’, which is controlled by ...
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52 views

how does node remove conflicting transactions from memory pool?

Sorry for the long text. This is just my observation and was wondering if you could let me know if I am correct or not. Case 1) Let's say minerA and minerB both have the same transaction in their ...
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1answer
91 views

Given a bitcoin block, what's the easiest way to determine the minimum net fee rate (including ancestors) for transactions in that block?

Given a bitcoin block, what's the easiest way to determine the minimum net fee rate (including ancestors) for transactions in that block? A naive approach would be to just find the minimum fee rate ...
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1answer
437 views

In Math or Python notation - How to convert bits to difficulty?

Questions What are the equations to convert between bits and difficulty? & understanding bits and difficulty in a block header ask how to convert between bits and difficulty. Unfortunately, I ...
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1answer
117 views

List of different unknown mining pools

A miner can identify himself when he receive his coinbase transaction, we can view them on website offering block explorer like https://www.blockchain.com/charts/pools Some of these miners are listed ...
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anyone can help me recovering my bitcoin bip38 password? [duplicate]

i have bitcoin wallet with more than 1 btc but i cant import it without losing this amount cos i forgot the bip38 password public key: 1CZosSHnf87ZqZ3fRiAuikpzdCZhAKsi3y private key: ...
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1answer
47 views

Tiny 1-block forks in blk.dat files

I just completed parsing the Testnet3 Bitcoin blockchain stored in the blk.dat files into a database. Since I was using multi-processing to parse several files at the same time, I didn't add the ...
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4answers
757 views

How is data in a blockchain stored? Structure of block and blockchain

I'm trying to build a blockchain-based application and I have a problem with understanding some crucial issues. What exactly is a block? I mean, I've seen application where blocks were just String ...
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2answers
361 views

How many transactions are there in one block

What I understand: When a transaction is made , miners compete to validate it and create a hash . If one miner creates the hash and more than 51% of miners agree on the validity .Then the a block is ...
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1answer
66 views

Why are mined blocks not always full

Why do mined blocks tend to vary so much in size. If the miner's objective is to maximize their revenue from transaction fees they should add transactions starting with the one with the largest fee, ...
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1answer
53 views

How come the bitcoin blockchain is only 285gb only?

I found some statistics that the bitcoin blockchain is 285gb. https://www.statista.com/statistics/647523/worldwide-bitcoin-blockchain-size/ Bitcoin has been around for how long? 10 years? with 1mb ...
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1answer
107 views

How to see highest available block number in "Bitcoin Wallet" app for Android (Schildbach wallet)?

If I have downloaded the "Bitcoin Wallet" by "Bitcoin Wallet Developers" (Schildbach wallet) onto an Android phone from the Google Play store, how can I see the latest block number ...
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1answer
167 views

How to know Block height when a transaction entered Mempool?

I'm hosting a Listening Bitcoin Node in Capital of Pakistan. I want to know the Block height when Transaction entered the mempool. Right now I'm using the time from the Json format of the Transaction ...
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1answer
91 views

Some miners set the nVersion field of the block header to 0x8000004. What were they signalling for? Was this an error?

Some miners set the nVersion field of the block header to 0x8000004. What were they signalling for? Is this an error? I have been through a lot of the BIP documentations, but cannot seem to find any ...
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1answer
7k views

What is the block verification procedure, and will it ever become too expensive?

I'm trying to get a grasp on which items the network is responsible for validating / enforcing. If I understand correctly, when a new block is received, the recipient needs to verify the following: ...
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2answers
2k views

Which cryptocurrency has the smallest block time?

What is the lowest block time of any cryptocurrency? I don't mean the time of an individual block, but the target time per block. What is the shortest reasonable block interval?
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1answer
76 views

bitcoin block time after halving? [duplicate]

I would like to know why the bitcoin block time is taking longer than 10 minutes, I know that bitcoin halving had decrease reward and increase difficulty but according what I read the blockchain ...
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1answer
60 views

How to get the time when a block is received at a node?

Is there any variable in the bitcoind code that records the timestamp when a block is received for the first time by a particular node? To be more precise, for transactions, transaction information ...
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0answers
311 views

Pruning Blockstore has been running for days

After activating the core (Testnet - Pruned) with the command bitcoin-qt i received the following error: Corrupt Block Database I restarted the synchronization always using the Pruned mode. The core ...
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1answer
39 views

How does a miner identify himself

There has been a new mining pool appearing after the halving called Lubian.com cf https://www.cryptoglobe.com/latest/2020/05/new-bitcoin-mining-pool-comes-out-of-nowhere-already-5th-largest/ How does ...
2
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1answer
48 views

Unable to replicate block header validation errors: time-too-old and time-too-new

we are playing with the regtest and we don't able to replicate the two blocks validation error managed here https://github.com/bitcoin/bitcoin/blob/5b24f6084ede92d0f493ff416b4726245140b2c1/src/...
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4answers
1k 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 ...
0
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1answer
181 views

Testing altcoin reward halving - Help! [closed]

I am currently working on reward halving changes for a test coin and i have added all the necessary changes but my question is how do i safely test this new halving without affecting production. I ...
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0answers
50 views

What does the version number in the blockheader represent

While looking up how a block get mined I stumbled over the version number in the header - which is used to "keep track of changes to the protocol". But even in the last 5 blocks of the chain (at the ...

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