Questions tagged [soft-fork]

Should be used for questions regarding softforks of the bitcoin blockchain

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1answer
2k views

How is SegWit a soft fork?

Reading this section of BIP144, I noticed the followng statement: Parsers supporting this BIP will be able to distinguish between the old serialization format (without the witness) and this one. ...
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3answers
2k views

Can old coins be banned by a soft fork?

Satoshi Nakamoto is supposed to own 1.000.000 bitcoins on a thousands of wallets, and most of them are untouched since early blocks. This stake can potentially flood the market, so miners could ...
7
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1answer
400 views

How do BIP8 and BIP9 differ, how are they alike?

With Taproot on everyone's lips, people have started discussing activation approaches. The debate is currently seems to favor BIP8. Previous soft forks used BIP9. How are the two related and what are ...
6
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1answer
66 views

How do we know which soft-forks were implemented using User-Activated Soft Fork or Miner-Activated Soft Fork?

This seems to be the most common definition When a majority of miners upgrade to enforce new rules, it is called a miner-activated soft fork (MASF). When full nodes coordinate to enforce new rules, ...
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3answers
455 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 ...
4
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1answer
116 views

BIP34, BIP66 and BIP65 should have been enforced at unique block heights. Why do different sources claim different block heights for enforcement?

Inconsistent Consensus/Activation of BIPs BIP34 Activated Block Height 227,835 (BitMEX Reference) Activated Block Height 227,930 (Bitcoin Developer Reference) Activated Block Height 227,931 (...
4
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1answer
282 views

Activation of SegWit v1

The segregated witness soft fork of August 2017 included a versioning field which would allow for future incrementation. Anthony Towns has recently posted an early draft of the proposal for the SegWit ...
3
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2answers
244 views

Should block height or MTP or a mixture of both be used in a soft fork activation mechanism?

Should block height or MTP (median time past defined in BIP 113) or a mixture of both be used in an activation mechanism like BIP 8 or BIP 9 for defining the timings of the state transitions? What are ...
3
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1answer
253 views

What's the segwit transaction serialization “flag” field for?

According to bip 141, the segwit transaction serialization format (used to compute the wtxid) is: [nVersion][marker][flag][txins][txouts][witness][nLockTime] The bip mentions that the flag field ...
3
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2answers
2k views

Where can I find a complete list of Bitcoin forks (soft, hard, intentional and unintentional)

I was looking to study the history of Bitcoin forks including the 2013 incident that may or may not have been a Hard fork depending on your definition.
3
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1answer
159 views

What are the risks of a lower-than-95% activation threshold for soft forks (particularly SegWit)?

95% seems exceptionally conservative, especially given the evidence of vetoing by a subset of Bitcoin miners. What risks does, say, 60% over a longer activation period hold vs 95% for SegWit?
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3answers
102 views

Why is a softfork unable to divide the network?

I was wondering why a soft fork cannot in principle divide the Bitcoin network as a hard fork can. I understand that a soft fork, by definition, involves only tightening the consensus rules, but the ...
2
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2answers
80 views

How do nodes verify backwards incompatible blocks?

When you start the initial block download with the latest versions of Bitcoin Core, how does your node know that old blocks were valid according to different rules prior to soft forks?
2
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1answer
96 views

Can we experiment on Signet with multiple proposed soft forks whilst maintaining the ability of full nodes to validate the Signet chain?

One of the goals of Signet is to test proposed soft forks before they are activated on mainnet. Not only does this mean proposed soft forks such as Taproot that at the time of writing (August 2020) ...
2
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1answer
53 views

What is a softchain?

What is softchain and how is it different from drivechain? What are associated tradeoffs and feedback from community?
2
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1answer
48 views

What is the point of a soft fork when it's backwards compatible?

I understand a soft fork occurs when changes in the Bitcoin protocol are backwards compatible, but why is that a fork? Is there really a branch or is that just a formality? Or does this give me a ...
2
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2answers
277 views

How do the nodes divide after a hard fork? Soft Fork?

After a hard fork, what happens to the full nodes? Say 11,000 BTC full nodes existed prior to the fork. Do all 11,000 end up supporting both BCH and BTC? Or does BCH start building it's own network of ...
2
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1answer
114 views

BIP9: What happens if I make a segwit transaction after lock in but before activation?

Will it be treated a anyone-can-spend or do the nodes enforce the new rules? Along the same lines, what exactly happens when we say a soft fork is activated? Are the enforced at the time SF becomes ...
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0answers
22 views

Why is BIP133 listed as 'Draft' when it has been implemented for years?

BIP133 is listed as 'Draft' but it has been implemented since v.0.13.0 https://github.com/bitcoin/bips/blob/master/bip-0133.mediawiki Is there anything preventing it from being labelled as 'Final'?
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0answers
84 views

Is a replay-attack-proof soft fork possible?

Say there is a soft-fork. A is the chain that implements it, B is the chain that has a transaction that's valid pre-soft-fork, but invalid post-soft-fork, so it's following the old rules. We know that ...
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2answers
226 views

Does a soft fork result in two different blockchain versions?

I've read the following: Both forks create a split, but a hard fork creates two blockchains and a soft fork is meant to result in one. Let's consider 2 situations: block size max limit is 1mb and ...
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2answers
106 views

BIP 144 transaction format and soft-forks and old nodes

I was trying to manually parse a raw Bitcoin transaction in order to better understand how it works. This is how it starts: "0200000000010141035625cd030eca667c95d1729a" I think I've parsed the Tx ...
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1answer
38 views

Broadcasting deprecated block version

With the recent addition of Binance to the group of miners who will accept taproot, I wonder what would happen if despite a total of more than 99% of the network accepting it, a miner still doesn't ...
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2answers
78 views

Were anyone-can-spend transactions valid before SegWit?

Non-segwit nodes (legacy nodes) see segwit transactions as anyone-can-spend (ACS) transactions. It is clear that such a nodes can (and do) validate blocks containing ACS transactions, because the ...
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1answer
61 views

A Bitcoin soft fork idea to help compress the blockchain

I've thought about a soft fork that can help storage costs. Why don't we force miners to embed the height of the TX Merkle tree in the first two bytes of the 4-byte block header version? It would ...
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1answer
39 views

why bip 34 uses two step on MASF(Miner Activated Soft Fork)?

in bip 34, which change to bitcoin version 1 -> 2, uses two step for network's consensus. step 1. check if 750 of the last 1000 blocks are version 2 or greater. step 2. check if 950 of the last ...
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1answer
393 views

Which nVersion bit is the “hard fork bit?”

A 2015 draft BIP suggested using a "hard fork bit": The most significant bit in nVersion is defined as the hardfork bit. Currently, blocks with this header bit setting to 1 are invalid, since BIP34 ...
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1answer
67 views

What is the limitations in Bitcoin's network that can't be change by a Soft Fork?

I'm trying to understand why (Or how) there is all kinds of different version for the Bitcoin nodes? I saw that if one node is following the Protocol limitations it can act as a valid node. Is ...
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1answer
37 views

Why does the threshold apply to the MUST_SIGNAL phase in revised BIP 8 (lot=true)? Why doesn't it enforce 100 percent signaling?

BIP 8 states that: During the MUST_SIGNAL phase, if (2016 - threshold) blocks in the retarget period have already failed to signal, any further blocks that fail to signal are invalid. Why doesn't it ...
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2answers
283 views

What happens to old transactions in case of a fork?

I'm confused about forking. What happens to the 'old' version of a blockchain and related transactions/data in case of a fork. Can they still be deleted or does the new branch still depend on them to ...
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1answer
138 views

Trying to understand SegWit

Can someone please help to confirm my understanding of SegWit ? My understanding: Originally, signatures are included in each block alongside each transaction, these signatures can be read by nodes ...
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1answer
314 views

Is Bitcoin centralized by mining pools?

Before going to my question, I want to make sure the difference between a full node and a miner. Below definition might be too simple, but it is enough to ask my question. A full node is to store ...
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0answers
24 views

Questions RE soft forks

I’m trying to understand how the Bitcoin network works a bit better and the main thing I’m having trouble with is forks, particularly soft forks. I have a few questions about how exactly a soft fork ...
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0answers
31 views

How could be useful the softforks field that provides the RPC command getblockchaininfo?

When I execute the command getblockchaininfo I see useful information but I don't understand how to be useful the information that is displayed through field softforks, the example below: bitcoin-cli ...
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1answer
888 views

How to fork a cryptocurrency [closed]

I have cloned a coin and changed some variable to make it my own coin. I have launched it and have a few mining pools mining my coin. Going through the code I notice I have an error and the reward ...
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0answers
29 views

Miners and Nodes: what are their role in protocol updates?

What are the different roles of miners and nodes for protocol updates (governance)? Which group is more important?
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1answer
50 views

Why are pre-softfork blocks are not causing problems for post-softfork clients?

i read the answer to this question and got some new one. As far as i understand how a soft fork works, it means that post-softfork clients with new consensus rules accept only blocks that follow ...
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2answers
2k views

What type of fork is Litecoin?

Is Litecoin classified as either a hard fork or soft fork? If neither, what is considered as?
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1answer
39 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 ...
0
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1answer
166 views

What are the next forks of the Blockchain that have been announced?

What are the next forks of the Blockchain that have been announced? When will they occur? Where can you be kept updated? Many thanks for the replies! David
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1answer
97 views

What if old blocks invalidate with soft fork?

Making a soft fork means making consensus rules stricter. Therefore there is a risk that some old blocks mined long down the blockchain get invalidated. How was this handled in bitcoin soft forks? ...
0
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1answer
69 views

If I delay upgrading to the latest Bitcoin Core version post Taproot activation does my node ever verify early Taproot spends?

Let's assume the Taproot soft fork is activated in June 2021. I continue to run an old version of Bitcoin Core (not enforcing Taproot rules) in July 2021 and so my full node treats valid Taproot ...
0
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1answer
38 views

Can we detect contentious soft forks created by the miners?

Can we analyze the blocks or the data sent per block in order to see if it includes new data that we do not recognize and assume that's a soft fork and invalidate such a block? Can a softforked mining ...
0
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1answer
32 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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1answer
37 views

bitcoin soft-fork how are the older nodes going to the verify new transaction?

I know soft fork which is compatible with older rules, but how are the older nodes going to the verify new transaction? for example : block#100 there is a new rule transaction. the miner who ...
0
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1answer
45 views

Why are transactions not used for signalling?

Currently miners can signal for certain BIP proposals. But users cannot signal, that's why they need to indirectly force miners to vote for them, using UASF's. But why are transactions not used for ...
0
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1answer
28 views

Why is there no forced signaling during the LOCKED_IN phase of BIP 8(LOT=true)?

Why is there no forced signaling during the LOCKED_IN phase of BIP 8(LOT=true)? During the MUST_SIGNAL phase of BIP 8(LOT=true) a threshold of miners have to signal. The next phase after MUST_SIGNAL ...
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0answers
26 views

Can Block-version signalling still be implemented and how to do that with the current code base?

There is a generation of softforks used the block header's nVersion field for signalling (up to the year 2015). Each of those used a subsequent version numbers (BIP34 used version 2; BIP66 used ...
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1answer
56 views

Could Bitcoin Core leave the lockinontimeout parameter choice entirely to Bitcoin Core users and not set a default?

There doesn't appear to be overwhelming consensus on the lockinontimeout (LOT) parameter for the Taproot BIP 8 activation mechanism. I know some would strongly argue against doing this but could ...
0
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1answer
48 views

What is the point of miner signaling in a soft fork activation mechanism? What should the threshold be on miner signaling?

What is the point of miner signaling in a soft fork activation mechanism? What should the threshold be on miner signaling? The second part of this question was asked by devrandom on IRC. A question on ...