Questions tagged [blockchain-fork]

This tag should be used for questions regarding any split in the Bitcoin blockchain

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39 views

How often does temporary fork occur and how long does it last?

I was wondering, how often does temporary forks occur? They appear when there are two different blocks mined based on the same previous block (parent block), but what are chances for that? And if fork ...
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1answer
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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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What was the first BIP9 block? Block 370,434 (0x20000007) or Block 398,364 (0x30000000)?

Block 370,434 (00100000000000000000000000000111) and (0x20000007) Yes: BIP9 says set top 3 bits to 001. No: BIP101 explicitly says set first, second, third and 30th bits to 1. No: No mention of BIP9 ...
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2answers
26 views

Is there an RPC command that checks for hardforks

There are some useful RPC commands that you can use in your bitcoin.conf file to trigger code when blocks have been confirmed, such as the blocknotify command. Is there are similar command that will ...
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0answers
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Which major/noteworthy BIPs, Soft-Forks and Hard Forks have there been since the Summer of 2017 (after SegWit/Bitcoin Cash)?

There are many lists of major forks however most of them end after SegWit. The full list of BIPs is extensive. Which noteworthy BIPs, Soft Forks and Hard Forks have there been since SegWit and Bitcoin ...
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0answers
24 views

What is the probability of having forks in PoW given different network size (miners count)?

Given a blockchain network of n nodes, where m of them are miners (m < n), what is the impact of m on the probability of having forks in Bitcoin or any PoW-based blockchain? It is clear for me ...
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1answer
31 views

Why is creating a bitcoin fork very difficult and a Ethereum fork easy?

There are a dozen of projects based on Ethereum but very few based on the Bitcoin network. Why is this?
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38 views

Bitcoin block maturity and block reward rules

According to the Bitcoin wiki: "When a block becomes an orphan block, all of its valid transactions are re-added to the pool of queued transactions and will be included in another block. The 50 BTC ...
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How does hard fork lead to a double spending attack?

I read some article mentioned that hard fork may lead to a double spending attack. I wonder how? And i have one more question: will the bitcoin wallet address change after the hard fork?
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1answer
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Any side-effects of upgrading to HD wallet in relationship to hard forks

I have a very old wallet that I created about 7.5 years ago. I realize that I need to upgrade to a BIP32 (HD) wallet. I am up to date with the latest Bitcoin Core and have kept it relatively up-to-...
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1answer
22 views

How a transaction is permanently accepted by the blockchain?

If a miner A creates a block containing a transaction A and a miner B creates a block NOT containing the transaction A about at the same time, then some of the other miners will first receive the ...
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1answer
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Can the forked be unforked? [closed]

So: BTC, BCH, BTG and BSV all trade at different prices/values. All have forked off from BTC and have different development teams, theories, practices, technology, etc. I noticed that when you look ...
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Fork rate range in terms of network security

I am really new to bitcoin and am trying to understand the basics. Fork rate/Orphan rate is a measure of network security. The higher the fork rate, the more compromised the system. Also fork rate ...
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42 views

How do i have a 2011 bch transaction?

I was under the impression that BCH did not fork untill 2017. How was i making transactions in 2011?
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1answer
32 views

If I am on a fork, can the reindex parameter fix this?

I've been reading confusing information online about what the --reindex startup parameter does. This link is not clear to me. https://github.com/bitcoin/bitcoin/blob/...
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Understand double spending through an example

Let’s suppose you have 1 BTC which you try to spend twice. You made the 1 BTC transaction to a merchant (Transaction T1). Now, you again sign and send the same 1 BTC on another Bitcoin address to try ...
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1answer
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Fork and Longest Chain Rule

At the same time, A and B succeed in resolving the "Proof of work" challenge and both add a new block to their local blockchain, then they propagate the new blockchains to other nodes. I have 2 ...
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1answer
49 views

Bitcoin Orphan blocks - short question about the “time lag” factor and proof-of-work “size”

"However, it is possible that two miners produce a block at a similar time. This situation occurs because the acceptance of the blocks into the blockchain by the nodes of the blockchain network ...
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2answers
145 views

Can a blockchain's transactions be reversed?

Blockchains are often described as 'immutable' (meaning the history cannot be rewritten after the fact), but is this really true? How easy is it to change the history? I have read about the Etheruem ...
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1answer
149 views

A Blockchain that merges mining forks and could be more power-efficient? [closed]

I'm new to blockchain technology so I'm sorry if I'm using wrong terminology. This is not a Bitcoin question, but a general blockchain question. Imagine a theoretical blockchain that uses gradual ...
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1answer
51 views

Chain Race: How to know chain-length of competing chain?

If a fork happens, miners mine on the block they receive at first. Further, they only forward the block they received first (so the block they will use to mine)! So it can happen that 10% of the ...
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2answers
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What happens when the last added block in a blockchain is corrupted?

What happens when the last added block in a blockchain is corrupted? Is it still possible for the block to be accepted by a majority of the miners?
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1answer
153 views

“Fork choice rule” : A general term? or a specific algorithm?

Is "Fork choice rule" a general term including all the algorithms used for choosing a branch among other branches in a fork (including longest chain rule in Bitcoin etc) ? Or is it a specific ...
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1answer
38 views

How can Bitcoin protect itself from a “dumb majority soft fork”?

Let's say a majority of miners change to using software that prohibits timelocks. This would be a softfork, so the blockchain would still look valid to nodes using the previous software, however nodes ...
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1answer
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Bitcoin Core mempool after disconnecting a block

After reading this answer by Pieter about "undo files" I'm wondering what happens with transactions that were included in orphaned blocks but are left out the new blocks when "rolling back". Are they ...
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1answer
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How bitcoin nodes update UTXO set when their latests blocks are replaced?

Let's say bitcoin node has 100 blocks. Then he recieve another two blocks. Now it have 102 blocks. But now he recieve block 103. And this block is from another chain and our node have to remove blocks ...
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1answer
66 views

Does the pool miners in mining pool receive the same block in case of a fork?

For example there are 2 mining pools A and B and they mined a block in same time. Then, A mining pool got a block that A mining pool mined? Or nodes in mining pool receive independently so they ...
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I mined in early 2010 with a cpu miner and just found my keys after forgetting all thease years, no joke need info please

who is the best most reputable bitcoin recovery company? I have added details and questions about our situation below Thank you And God Bless what was the mining program from the devs back then? I ...
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1answer
55 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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2answers
163 views

why 'increasing the block size above 1 MB requires a hard fork.” actually not require fork?

in this link, they say “increasing the block size above 1 MB requires a hard fork.” In this example, an actual block chain fork is not required—but it is a possible outcome. but i can't ...
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1answer
71 views

what happens if a miner include a transaction already exists in another block?

Suppose that I have a Transaction A. (txA) I send my txA to bitcoin network and full node validate it and put in Mempool and starts to broadcasting it. A Miner A connect to a fullnode to create a ...
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2answers
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What happens to the transactions included in the forks?

Let: a) the vector triplet <x,y,z> refer <height, index, parent_index> b) blocks, block100, block110 (of height 1) are mined together and they both refer previous block block00[null] (of ...
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1answer
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Why isn't the block hash used to calculate accumulated work?

Why is this idea flawed? It doesn't seem to be a bad idea at first, because the miners should be incentivized to extend existing chain, instead of to "remine existing blocks", since such "remining" ...
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3answers
427 views

Would it be possible to create a soft-fork for reducing miner reward?

Context: There is a bet going on r/bitcoin about the possibility of doing a user activated soft fork for reducing current miner reward to 0.25 BTC. One of the users says the bet had two points: the ...
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3answers
542 views

I have a Bitcoin ABC full node. How do I split off Bitcoin SV?

I have some BCH in a Bitcoin ABC full node, which is currently running 0.18.5. I want to obtain the corresponding Bitcoin SV without spending on both chains at the same time and losing the BSV. I am ...
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1answer
108 views

how to create a transaction that can only run in bch-abc using javascript?

I use the "bitcoincashjs" or "bch-lib" and want to add a new opcode "OP_CHECKDATASIG" to output.How to do? const utxo = { 'txId' : '...
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1answer
334 views

How was FORKID used in Bitcoin Cash at the original fork point and in all upgrades since?

References: https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/replay-protected-sighash.md https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/2018-nov-upgrade.md It ...
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1answer
53 views

How many coins will be available after bitcoin cash fork?

I am confused about bitcoin cash fork. Will Bitcoin Cash disappear and its name change to the Bitcoin cash ABC? or after hash war there will be only one coin?
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How can Bitcoin Cash be blocks ahead of Bitcoin SV

After the Bitcoin Cash & Bitcoin SV fork, Bitcoin Cash is happy to be "ahead" of Bitcoin SV, but how is this possible? aren't blocks supposed to be mined constantly every 10 min?
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1answer
28 views

how to prevent losses after a hard or soft fork

i learned about hard and soft forks from this question; now i have a basic understanding about forks; but the answers of that question did not say what happens to transactions on the stale chain; if i ...
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2answers
61 views

Ardor Transaction was generated on a fork error

I tried to sign a transaction and then broadcast it, but I get the following error: Error! Failed to broadcast transaction: ecBlockHeight 221000 does not match ecBlockId 932...., transaction was ...
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1answer
35 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 &...
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2answers
191 views

What are Forward Blocks?

Mark Friedenbach says "Bitcoin’s Block Size Can Be Increased Without Hard Fork". Can someone ELI5 what are Forward Blocks?
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1answer
118 views

Transaction in orphaned block question

This is a theoretical question. Assuming that a transaction (TX_A) with me on the receiving end gets added to the blockchain, I should be able to spend the amount I received. So I go on and spend it ...
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1answer
167 views

When does a blockchain fork resolution happen?

I understand that the forks are resolved by largest proof-of-work etc. but when do the miners decide to resolve a fork? Is it a network consensus or do each individual miner resolve at their own pace?
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1answer
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Bitcoin version conundrum

Given that the Bitcoin node software not centrally controlled (auto updated) and many different versions and implementations exist around the world, how would a core change be possible if it is not ...
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37 views

What is the longnest blockchain fork that has been orphaned to date?

On this thread, the user asked what is the longest unintentional fork that Bitcoin had suffered. From the answers present, Bitcoin never had a >4 block fork until 2012. It has been 6 years though, ...
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1answer
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Blockchain gets stucked if no blocks are mined

Yesterday I decided to fork a project, just for fun and to learn more about it. So, I forked a project, I generated my own genesis block, changed timestamps, nounce, keys, reset the min chain work. ...
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1answer
545 views

How can forks coexist even though only one of the is the longest chain?

We know Bitcoin has some forks like Bitcoin Cash and Litecoin. They make a new branch on chain, so how can they coexist without the shorter branches being discarded, and just the longest chain staying ...
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213 views

Why choose the longest chain before checking for double-spending?

Can we make the following changes to the current POW protocol to better avoid double-spending: a) For full/mining nodes that receive two chains, check if there are identical addresses that occur on ...

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