Questions tagged [block]

This tag should be used for questions related to Bitcoin blocks

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2answers
90 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 ...
2
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1answer
91 views

Why is a “first seen” rule is used to pick a side in a honest split, instead of deterministic criteria? [duplicate]

I was just thinking, why nodes pick the first block they see when there is an honest split, instead of picking, for example, the one with the "best hash" (number further away from the difficulty cut)? ...
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3answers
203 views

Block Validation: who does it? How much it costs? And is it present in all protocols?

Different threads were posted in order to clear up this question, but there are some points that I would need to confirm: When you become a full-node (NOT miner, you just downloaded the full ...
1
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2answers
61 views

mining: losers get nothing?

if the winning miner takes the 12BTC+fees, unless you own the biggest mining operation out there, or are not a member of the biggest pool, why bother mining, if there is no prize for second place? ...
1
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1answer
58 views

identical coinbase transactions

this sounds like an old topic but i have not found a satisfying answer yet; in history there lived two blocks with identical coinbase transactions: https://www.blockchain.com/btc/block-index/106662 ...
1
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1answer
31 views

What would happen if I publish a modified version of an earlier block? Would it be rejected immediately by peer nodes?

I am reading the book "Mastering Bitcoin" and have finished reading Chapter 2 and 10, but I still don't find the answer. Suppose the current main chain has 5 blocks: B0 <- B1 <- B2 <- B3 &...
1
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0answers
120 views

Estimated number of hashes

This is not a duplicate of previous, similar questions I've read on StackExchange, since none of those questions, nor the answers, go into the difficulty theory, as espoused on the Bitcoin Wiki. ...
1
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1answer
166 views

Fixing “Block not found on disk” rpc error

I have a full node with txindex enabled that I've been trying to use for an electrum server. However, whether I use ElectrumX or Electrs, I hit the same error on initial indexing of "Block not found ...
1
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0answers
20 views

What needs to be done inorder to change difficulty?

I'm trying for a while to reduce difficulty of main network to do some experiments on transactions and maybe simulate some possible attacks.I came up to change nBits field in chainparams.cpp but it ...
0
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1answer
29 views

Why the block's order in blockxxxxx.dat is different from blockchain.info

I parsed the block00000.dat using python code: class BlockFile: def __init__(self, block_filename): self.block_filename = block_filename self.blockchain = open(block_filename, 'rb', ...
2
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1answer
119 views

How come Merkle tree is more efficient when tree branches are not stored in blockchain?

Suppose we have 8 transactions in a block X as follows and we know every node's hash value of the whole Merkle tree (that is, including intermediary nodes such as 45). Then if someone claims ...
0
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2answers
48 views

Why most of pubkeys in the first batch of blocks in blk00000.dat are different

For example: the pubkey in the first 3 coinbase's output are 04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f ...
0
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2answers
104 views

Is there any python library could be used to decodescript in output

For example decode the ScriptPubKey like 4104678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5fac to some data like ...
0
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1answer
16 views

Mining when there is no transaction [duplicate]

what happens when there is noone doing transactions and miners mine the blocks? Can they mine empty blocks? And how it works when there won't be any hash in empty block or there is a hash? Thank you
0
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1answer
24 views

Number of transactions in block

why sometimes block has 16 transactions and sometimes over 2000? I checked it on https://blockexplorer.com/blocks. Thank you
0
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1answer
47 views

In Litecoin every single block is mined every 2.5 minutes, double spending?

In Bitcoin it takes roughly 10 minutes for every block to be mined. In Litecoin it takes 2,5 minutes. 2.5 minutes in Litecoin mean that transactions can be confirmed faster. In Bitcoin these 10 ...
6
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3answers
2k views

Shortest and Longest block interval time ever recorded in Bitcoin

Bitcoin block interval time is on average 10 minutes, that is the difficulty is adjusted in such a way that every 10 minutes a miner will manage to find the right hash. This is just an average time ...
2
votes
1answer
105 views

Different balances in API block explorers for BTC

BTC.com block explorer shows bigger balance than for example Insight or Blockchair. For example: https://btc.com/1FLDCfr9iG7n6bAdGsqBXmhaLgC4aSze72 https://insight.bitpay.com/address/...
0
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1answer
38 views

Who set the rules for validating a block in blockchain?

Who set the rules for validating a block in blockchain? The rules can be set the creator of the blockchain network. There might be some rules on the application that uses the blockchain network. Is ...
1
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1answer
55 views

While attempting to fetch a particular block my node just gets disconnected by peers?

A system at an office has its testnet node stuck at a particular block. The logs report "requesting block" over and over again for the same block and after each one reports "socket recv error" and ...
1
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1answer
16 views

Diffrent transactions in different block sync problem

Consider that miner A and B both try to solve its block, A's block has transactions (T1,T2), B's block has transactions (T1,T3). A solved its block then synced the block to B. Does B will discard its ...
1
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1answer
67 views

Detecting stale blocks with ZeroMQ

I'am writing an application which receives information about new tx and blocks via ZeroMQ. There is a chance that I will receive notifs about blocks which will later on become stale blocks. Is there a ...
0
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2answers
116 views

When are blocks validated?

Are blocks validated just before they are stored to memory, upon receipt from an RPC submit call, or at some other time? Can you point to the place in code where this validation process begins? Is ...
2
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2answers
64 views

Blockchain validation process is linear?

I've read at a few places that the nodes validate transactions in a linear fashion, i.e. after node A validates, then node B, etc. (which is also the reason, as claimed by many, why blockchain suffers ...
0
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0answers
43 views

Bitcoin transaction scripts : does ScriptSig or ScriptPubkey run first? [duplicate]

I'm confused as to the order regarding which script is run. For examples sake: say I want to spend 1 Bitcoin which was given to me by Alice in a single transaction of value 1 Bitcoin. I understand ...
0
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2answers
39 views

Bitcoin.org developer reference outdated?

i just can't understand if bitcoin.org developer reference is outdated or not. for example here (https://bitcoin.org/en/developer-reference#raw-transaction-format) we can see: "As of Bitcoin Core 0.9....
0
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2answers
186 views

Bitcoin New Block Event Trigger

I want to know when a new block is discovered, I am watching debug.log to see if it has changed, I know there is a new block if the line contains "UpdateTip: new best". Is there a better way to do ...
0
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1answer
167 views

How to get Coinbase Text for newly found block

Websites like blockchain.info and btc.com give Relayed By information to find who found the block. I can see coinbase text in the website https://coin.dance/blocks. Is it possible to get that ...
0
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1answer
45 views

who actually amasses or builds the blocks … and how do they get passed to miners?

The question is not about the block being included on the block chain, but who actually creates a block? Like what is the process here. Can someone walk me through this? I do know that blocks are ...
0
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1answer
164 views

How do I double SHA-256 the header of block #59,500?

I'm not sure how to combine all of this information. https://blockchain.info/block/00000000096af43105123c499521e1d131d172e7e1bf2ed0843290a921f1f6a7 Version 1 Time Bits 470771548 (is this the right ...
1
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1answer
256 views

How to add Bitcoins to my wallet

I am new at this and I was given a bitcoin from a miner, how do I know what it is worth and how do I put it in my wallet?
0
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0answers
28 views

How are transactions hashed together to form a Merkle Root? [duplicate]

In block #59,500 there are 2 transactions Transaction 1. 6653ad77d695752cff9fe63bbb5702a53807be534c537251d53de06aac5ca093 and Transaction 2. ...
1
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1answer
73 views

Serialized Block doesn't have all the fields of a Block

bitcoin-cli getblock 000000000003b9c88b8a4bf0bac7059913381bba300cdfddffc54a3d8c6e8105 false This command will give block related data in the form of Hex. This Serialized data doesn't contain certain ...
1
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1answer
105 views

Would nine 1MB transactions potentially create havoc on the BitcoinCash network

It appears that the BitcoinCash chain is still on its original BCH main chain, and non-upgraded mines/exchanges/wallets can still transact there. What then would happen if nine (or more) 1MB ...
0
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1answer
68 views

Full node storage requirements for new 2MB block which is only 10% full

If blocks were 2MB, and a 2MB block that is only 10% full gets confirmed, then how much additional storage is required on a full node? I am guessing the correct answer here is 200K? Thanks in ...
1
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1answer
237 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 ...
0
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1answer
70 views

Would mining future bitcoins break the bitcoin?

assuming an bitcoin miner with very much hashrate like bitmain would decide to mine "future" bitcoin blocks and provide them within very short time to the network, would this break the bitcoin? As i ...
1
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4answers
57 views

Why blocks are validated instead of transactions?

In most of the conventional blockchains, blocks are validated instead of transactions. Why cant' transactions validated directly? The structure of basic blockchains are linked lists, by having DAGs, ...
0
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1answer
44 views

How are mined blocks broadcasted in a distributed environment?

I understand that after the golden nonce is found by the miner he broadcasts the block and the other miners verify it. But I don't understand how they broadcast it because bitcoin is completely ...
2
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4answers
245 views

Why miners need to broadcast blocks that contains full transactions in Bitcoin?

Does anyone know why Bitcoin requires miners to broadcast blocks that contains full transactions? When a user want to make a payment on Bitcion, he/she needs to broadcast a signed transaction, and ...
1
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1answer
51 views

When we're calling `getrawtransaction` how does Bitcoin-core calc and verify confirmations?

if a transaction has 10 confirmation, does bitcoin-core check if the txid exists in the last 10 blocks? or its calculated based on transaction block number?
0
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2answers
563 views

How to decode the block hash?

I got the block hash from zmq. 00000000000000000045c639280aee532c5b12b03c80bfdec7aae674fd8246e0 I want to decode the above block hash. Could anyone tell me how to decode the above block hash?
2
votes
1answer
47 views

Is transactions in bitcoin blockchain always coin transaction?

I'm new to crypto currencies correct me if I am wrong, when I checked the block explorer I found a single block contains nearly 2300 transaction in it and I think at an average every 10 minutes a new ...
0
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1answer
32 views

How bitcoin wallets connected between

I'm thinking, is it dangerous to buy bitcoin, in case if government want to block it? How bitcoin wallets connected between? If I'm right - there are support servers, who providing connection between ...
0
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1answer
44 views

Requesting Blocks

I've been thinking about this for a while and can't seem to understand part of the network. Lets assume that I'm a node that has been offline for 5 months and I want to retrieve the new blocks. When ...
0
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1answer
34 views

is it possible to retrieve some block transactions using bitcoin-core?

I'm trying to fetch specific block transactions, is it possible to do so using bitcoin-core? for example block number: 517716 can I get hex transactions or even just the txid's of that block?
0
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1answer
843 views

How to alter user's data in block in blockchain if i want to change user's details

In blockchain each user's data stored in seperate block, right? If I have created my own blockchain and i want to alter some user's data then I would need to alter some perticular block as I have ...
-1
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1answer
19 views

Pertaining to slushpool mining . What is the most lucrative way to vote ? Or does it matter

What is the most lucrative way to vote on slushpool? Or does it matter
2
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2answers
668 views

Difference between transaction chain vs blockchain

What are the difference between transaction chain in bitcoin and blockchain used in bitcoin? Is it sufficient to say to each transaction refers to previous transactions in the transaction chain and ...
0
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1answer
218 views

Can miner send garbled block height?

This previous answer shows that BIP34 adds block height as one of the fields in a coinbase transaction of a block. This question is about whether block height is calculated fully independently by each ...