Questions tagged [block]

This tag should be used for questions related to Bitcoin blocks

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19 views

unconfirmed transaction 1/2fdlhhxj

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
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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
41 views

How does a Bitcoin block get generated and 'agreed upon' by everyone?

When a set of new transactions is broadcast to all the Bitcoin mining pools, my understanding is that they all start working on a new block to include all those transactions. But how is it agreed ...
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2answers
34 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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1answer
100 views

Can two related “spends” be in the same block?

Consider the case where: Address A has some BTC. Address B is empty/zero. Address C is the intended recipient. B sending to C is invalid on its own, but does make sense if associated with A sending ...
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42 views

I'm not able to spend unconfirmed balance bitcoin core spendzeroconfchange option not working

I'm trying to make my wallet to spend unconfirmed transactions , I searched over the internet with no luck to fix this , I tried spendzeroconfchange=0 spendzeroconfchange=1 in bitcoin.conf still ...
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19 views

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
31 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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1answer
38 views

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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33 views

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
24 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
35 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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20 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
34 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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1answer
32 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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2answers
93 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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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
62 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
17 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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26 views

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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54 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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2answers
35 views

what does segwit remove?

It's said that Segwit removes signature data from transactions which makes block have more space for more transactions. Question 1) If SegWit removes signature data, where does it put it exactly ? ...
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23 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
71 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
44 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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1answer
50 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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40 views

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
34 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
133 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
74 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
45 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
47 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
39 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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1answer
39 views

How to search for an address in last block?

I want to check in bitcoin-core and see if there is any of my watching addresses in last block. So my question is how can I know a specific address is included in last block or not? I can search with ...
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1answer
88 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
50 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
41 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
39 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
127 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
60 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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0answers
30 views

Corrupt block database

I activated the core with bitcoin-qt as I always do. What can be the cause of the database loss? Synchronization is restarted from the genesis block. I use the testnet with Pruned mode activated.
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1answer
34 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 ...
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1answer
34 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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0answers
29 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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1answer
33 views

Why downloaded Block Size doesn't match with actual block size mentioned on network?

I am trying to download a block(Height:474044) using an API from here in python. Block is obviously downloaded in JSON format. But when I store it in a file on my system it shows very weird size ...
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1answer
115 views

Re-index/Re-download from specific height?

I seem to have discovered corrupt blocks on one of my nodes. The node is on all the time to keep up to sync and the rest of my nodes connect to it to retrieve block data when they need to sync. The ...
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0answers
20 views

GeForce GTX 780 desktop pc vs. old dell and toshiba laptops

I'm curious as to why when I mine Satoshis with the app "Bitcoin Miner" with my gaming computer I get slower or = to the hashrate that my older laptops are getting.. I assumed it would be 10x faster ...
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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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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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0answers
51 views

Transaction validation cost

what relation is between transaction size or a number of input and validation cost? for example, It's o(n) or o(n^2)?

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