Questions tagged [segregated-witness]
This tag should be used for questions regarding Segregated Witness (segwit), an activated softfork that defined a new transaction format which doesn't include signatures in the transaction identifier (txid).
396
questions
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24 views
Bitcoin was sent out and still hasn't been received
I sent bitcoin out to a segwit address (P2SH) and it split the transactions in 2 but I still haven't seen them delivered in into the wallet
1
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2answers
376 views
Derive LTC Segwit (M-Address) private key from Trezor
So I'm trying to get my head around this!
I've got my 24 seed for my Trezor.
I got my Segwit account for LTC (Address starts with M).
I also have the P2H equivalent for my address (Starts with 3).
...
3
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4answers
2k views
Vanity address generation for Segwit?
Vanity address generation is currently strightforward for "old" Bitcoin addresses (starting with 1) with multiple software options available (oclvanitygen e.t.c).
Is there any options to generate ...
2
votes
1answer
37 views
Why does witness use count instead of length?
In legacy transaction (without SegWit) the scriptSig is easily parsed by knowing the length of it (a CompactInt value) and without needing to read the script in place.
However in SegWit transaction ...
5
votes
1answer
383 views
Can I mix P2PKH and P2WPKH inputs in the same transaction?
I'm trying to increase my knowledge of bech32 and SegWit and to that end am working my way through this explanation.
Here's a hypothetical situation I'm trying to understand. Let's say Jamal has ...
2
votes
2answers
327 views
How do virtual size, stripped size and raw size compare between legacy address formats and native segwit?
This answer states that SegWit doesn't reduce transaction size. If this is true, why is it cheaper to send a SegWit transaction?
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0answers
37 views
SegWit-incapable miners won't include SegWit tx's but accept them as valid?
Why SegWit-incapable miners won't include SegWit tx's in their blocks but will accept as valid someone else's block with SegWit tx's in it?
0
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1answer
85 views
How to generate the digest from a raw bitcoin transaction for verifying signature of specific input?
I'm writing a stand alone process that needs to verify that a known UTXO is part of a new transaction with a valid signature.
Inputs [ UTXO, raw transaction, input_number ]
How do to I verify the ...
0
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1answer
138 views
Confirming transactions in the Merkle root and SegWit
I'm trying to find out how exactly transactions are confirmed in a block. I understand that to confirm a transaction, you hash it with its associated transaction and then the associated hashes until ...
4
votes
1answer
840 views
Does the bitcoin testnet3 network support Segwit and OP_CSV?
As far as I know, Segregated Witness and OP_CHECKSEQUENCEVERIFY are the last features needed to be able to fully implement a trustless bi-directional payment channel, from start to finish. (...
4
votes
1answer
172 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 ...
2
votes
1answer
677 views
Is there an address format for P2WPKH or P2WSH?
Is there an address format for P2WPKH or P2WSH? If P2WPKH uses the same address format as P2PKH, how does a wallet know which one to use?
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2answers
104 views
If I was developing a Bitcoin wallet, should I support both legacy and compatibility addresses?
To receive funds, I was thinking of giving a user the option of displaying two QR codes:
Legacy - p2phk e.g. 1AKDDsfTh8uY4X3ppy1m7jw1fVMBSMkzjP
Compatibility - p2sh(p2wpkh) e.g. ...
0
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0answers
19 views
Swift implementation of bitcoin transaction creation
Is there a well known and widely used Swift implementation for creating raw Bitcoin transactions and getting their hash (SegWit and Non-SegWit) of signing?
If not, is there a reference document that ...
1
vote
4answers
1k views
Generating a segwit (bc1) address from a brain wallet?
Are there any brain wallet generators that can generate segwit (bc1) addresses yet?
1
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1answer
140 views
Why hash witness script instead of pubkey script in signature?
When a segwit input is signed, the signature will commit to the witness script (or a p2pkh-like script in case of p2wpkh). This is specified in BIP143:
For P2WPKH witness program, the scriptCode ...
6
votes
2answers
1k views
How do transaction costs compare between Bech32 addresses and legacy Bitcoin addresses?
Now that Electrum 3 supports Bech32 addresses for segwit, when sending coins to a legacy address are fees higher or cheaper?
1
vote
1answer
48 views
Transaction version 2 - bytes between tx version and number of inputs
In the bitcoin transaction version 2, there are additional two bytes (hex: "0001") between transaction version (hex: "02000000"), and number of inputs (hex: "01"). What it is?
Here's an example https:...
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2answers
2k views
How to check if an address is valid in Bitcoin Cash?
A lot of users seem to be mistakenly sending Bitcoin Cash to Bitcoin addresses and vice versa. I understand Bitcoin Cash doesn't support SegWit and that if Bitcoin Cash is sent to a SegWit Bitcoin ...
1
vote
1answer
28 views
which was the purpose of changing the signature of a TX? or it was just a bug before segwit?
Was there any purpose in changing the signature of a transaction?
Or it was a bug before segregated witness?
Does segregated witness disable some wanted feature?
0
votes
1answer
139 views
regtest: ERROR: ProcessNewBlock: AcceptBlock FAILED: unexpected witness data found (code 16) on v0.14.3
I have two bitcoind regtest processes; v0.16.3 and v0.14.3. I got "unexpected witness data found (code 16)" when v0.14.3 node try to received a block from the peer (v0.16.3)
How can I fix it? (I'm ...
1
vote
1answer
90 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 ...
1
vote
1answer
389 views
How much does the weight of 2-of-3 multisignature inputs change between P2SH and P2SH-P2WSH?
I'm trying to calculate the weight of a 2-of-3 multisignature P2SH-P2WSH input. I found the related question Predict multi signature transaction size, which I've calculated out with m=2, n=3 here:
...
3
votes
2answers
161 views
How does the structure of a segwit block differ from a non-segwit block?
Is there any difference in the structure of a segwit block in comparison to a traditional non-segwit block? A diagram would be helpful if possible.
1
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1answer
193 views
Can you send a transaction from non-native segwit to native(bech32) segwit address?
Let's say I have a wallet with a non-native segwit address (prefixed with 3- like multisig).
Can I send my utxos from this address to a native segwit (bech32) address?
2
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1answer
44 views
Why is the wtxid considered malleable?
Why is the wtxid considered malleable since the transaction is unconfirmed?
How can a third-party modify it?
2
votes
3answers
334 views
Why does the decode function of the segwit bech32 encoder/decoder take a hrp (human readable part) as input?
Looking at the code referenced in bip-0173, specifically for example here:
https://github.com/sipa/bech32/blob/master/ref/javascript/segwit_addr.js
function decode (hrp, addr) {
var dec = ...
0
votes
2answers
104 views
SHA256 vs RIPEMD160 in SegWit
In Pay-To-Witness-Public-Key-Hash (P2WPKH), the RIPEMD160 hash function is used to hash the public key of the recipient in the locking script.
On the contrary, Pay-To-Witness-Script-Hash (P2WSH) uses ...
1
vote
1answer
144 views
Transaction Malleability, How can I change signature?
I'm kind of desperate as I can't follow some ideas that I don't understand. I hope you can help me. Thank you in advance
It's all about Segwit
Question 1) It says that when bob makes a transaction ...
1
vote
1answer
49 views
Transaction Malleability, if i want to change signature, what part should I change, so that it would remain valid?
I know what transaction malleability is, but I don't understand how someone can change my signature so that it would remain valid. For example, If I want to change signature what part should I change, ...
5
votes
2answers
307 views
Why didn't Bitcoin implement segwit in the first place?
Why didn't Bitcoin implement segwit in the first place?
Why and how does non-segwit Bitcoin enable a miner to change a transaction's txid?
From Mastering Bitcoin ch. 7 § "Transaction identifiers":
...
3
votes
2answers
1k views
P2WSH, witness_v0_scripthash: how to derive an address
Is there an address associated with P2WSH scripts?
for testnet txid =6717c8971dccbf826790efc16fb357f1e225fed3448247b8556c9f13a6c0ce42, i get:
"vout": [
{
"value": 0.05994165,
"n": 0,
...
2
votes
1answer
293 views
Are “1” , “3” and “Bech” Addresses (BTC) forward and backward compatible?
Wondering if lets say someone has funds in Bech32 and they send to a "1" or "3" address due to less characters to remember ect.
4
votes
2answers
151 views
What were the main technological reasons that Bitcoin Cash did not want to adopt SegWit?
What are the key risks/drawbacks to SegWit and why did the Bitcoin Cash community conduct a risky hard fork to avoid it?
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2answers
55 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 ...
2
votes
1answer
313 views
In simple terms, what are the major differences between P2WPKH and P2WSH bech32 addresses?
I've read over the bip173, bip141, and bip143 specifications and they're a bit too technical to get at the simple answers I'm looking for.
3
votes
1answer
46 views
Is SegWit similar to/ derived from Hyperledger Fabric?
Segregating the witness (signature) data from the transactional data is similar to the structure used in Hyperledger Fabric.
Curious about the derivation of SegWit?
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2answers
117 views
How can Segwit increase transaction throughput if the same amount of data is stored in the blockchain?
I'm posting this after reading the answers to this: Where is the Signature stored in a SegWit transaction?
I've found out from reading that, that in Segwit, the "witnesses" (or signatures) that ...
9
votes
2answers
2k views
Where is the Signature stored in a SegWit transaction?
I understand that SegWit makes transaction blockdata smaller, by not storing the signature in the Block, so that can fit more transactions in 1MB. This is because the signature is not anymore stored ...
0
votes
2answers
157 views
What is the command to sign a message using a segwit private key using electrum 3?
I want to sign and verify a message using a segwit private key that i generated with another application. How can I sign and verify a message using electrum 3 cli?
-2
votes
1answer
165 views
How to make segwit transaction and bech32 mandatory
Is it possible to make segwit transactions (and possibly segwit address: Bech32) mandatory in the Bitcoin Core code?
In other words, when a transaction is created using the wallet, the transaction ...
1
vote
0answers
199 views
How to send Bitcoin Cash from BTC segwit address? [closed]
I'm trying to build a nodejs command with commander, bitcoinjs-lib, bitcoincashjs, blocktrail-sdk. Currently I got the problem when trying to spend the Bitcoin Cash of segwit address.
Example:
A is ...
3
votes
2answers
95 views
SegWit Version - is there a proposal for new versions?
I can see transactions with version 0
Are there any other versions of SegWit proposed or in existence?
0
votes
2answers
41 views
Transaction order in the blockchain
What is the difference between segregated witness (segwit) and canonical transaction ordering (CTOR) ?
6
votes
1answer
1k views
Will SegWit allow for m of n multisig with very large n and m?
By reading this answer, I understand that in m-of-n multisig addresses, m and n are limited by the maximum size allowed by the P2SH redeemScript (i.e. 520 bytes).
However, in this section of BIP141, ...
4
votes
2answers
254 views
How segwit blocks are seen by segwit and non-segwit nodes?
Let's say a miner mines a block.
In this block some transactions will be non-segwit and some will be segwit?
The block contains two parts:
The part with transactions
The segregated part with ...
1
vote
1answer
85 views
What percentage of nodes currently support segwit?
What percentage of nodes currently support segwit?
It seems Bitnodes could figure this out, but I can't find such a stat on its website.
0
votes
1answer
69 views
Struggling to successfully broadcast a p2pkh transaction
I've been experimenting with sending bitcoin transactions with python for the past week. I successfully was able to send p2wpkh->ALL address types, p2sh-p2wpkh->ALL address types.
What I am ...
5
votes
1answer
673 views
Why does BIP141 define both virtual transaction size and weight?
Why does BIP 141 (segwit) define both virtual transaction size and weight?
Weight seems to be just four times virtual transaction size (or vice versa, depending on what you define first). Why are ...
0
votes
1answer
141 views
Segwit txin. Witness data association
I am trying to learn more about the bitcoin protocol and I am writing some python software to make a light wallet. I have advanced quite far and I have come across something that I dont really ...
