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).
417
questions
6
votes
2answers
349 views
Is there a difference between bytes and virtual bytes (vbytes)?
In an Optech newsletter, size is referred to using vbytes. Is there a difference between vbytes and bytes? If so, what is the difference?
0
votes
0answers
75 views
Mycelium not reading segwit bech32 (bc1) addresses from a private key
I'm trying to import my bitcoin private key into the Mycelium android wallet, but it keeps showing up as the legacy address that starts with 1xxx. I sent some coins to the bc1 address and I verified ...
1
vote
1answer
72 views
How to calculate txid for segwit transactions?
I'm having difficulty calculating txid for recent transactions. I followed bip-141 at https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki
For the first transaction in the first block found ...
0
votes
2answers
80 views
Raw SegWit TX look solid and verifies, but is rejected. Need help figuring out why
Consider the following transaction expressed as hex:
...
1
vote
1answer
35 views
For the 3 bitcoin address types, which can send to each other? Can a valid tx be created that spends to an unspendable address?
I'm just getting started with using bech32 addresses instead of legacy addresses, and I'm not familiar with how the legacy vs segwit compatible vs bech32 addresses play with each other.
Can I get an ...
0
votes
2answers
63 views
Are non-SegWit transactions still malleable?
SegWit was (amongst other improvements) introduced to fix malleability issues. Does that mean that non-SegWit transactions are still malleable? If so, what types of malleability could still happen in ...
0
votes
1answer
43 views
P2WPKH - which private key is used to generate signature?
I am looking at the BIP143 P2WPKH example. I am kind of following until the generation of the sigHash: c37af31116d1b27caf68aae9e3ac82f1477929014d5b917657d0eb49478cb670 but then that is used to ...
0
votes
1answer
28 views
Alternative to Python pip bitcoin
This Python pip package https://pypi.org/project/bitcoin/ was originally developed by Vitalik Buterin (that Ethereum guy) but is no longer maintained. Is there any alternative equivalent pip package ...
2
votes
1answer
47 views
Why is a library's signature of a segwit tx different from Bitcoin Core signature?
I have been writing a (yet another) Bitcoin python library primarily for educational purposes; for me and my students.
Signing a non-segwit transaction results in a signed tx that is identical to ...
1
vote
2answers
148 views
Electrum's “script hash” form with NBitcoin?
I've come across how scripts are hashed in the electrum (stratum) protocol implementation by looking at the docs.
I'm using NBitcoin, and I've tried to generate this hash from a segwit address, first ...
0
votes
0answers
44 views
Will non-segwit addresses still be able to send bitcoin in 5+ years?
My public address starts with 1,and I can currently spend the Bitcoin from it. However, as more and more transactions become only segwit based, will miners eventually just abandon verifying ...
1
vote
1answer
115 views
Find sender's public key in SegWit Transaction
How can I retrieve the sender's public key in a Segwit transaction?
For example: https://www.blockchain.com/btc/tx/3179d18d6f36fa77b88909496535485d8188d96b79d295843789a9e0ff6c3e6a
I can happily ...
2
votes
1answer
174 views
What does it mean if TXID and WTXID are the same?
I'm having a tough time understanding what exactly WTXID is and what it means when WTXID and TXID are the same (and vica versa).
What I understand is that WTXID includes the witness data. Since non-...
3
votes
1answer
62 views
What is the rationale for inclusion of previous amount in SegWit signing process?
When spending a P2PKH output, the "data" we hash only includes the output script from previous transaction but when spending a P2WPKH (the new serialization) we also include the amount field from ...
0
votes
0answers
159 views
Send to bech32 segwit address from Bitcoin Core 17.1
I have a non-HD wallet in Bitcoin Core v17.1. I have never used SegWit before.
I need to send some coins to a bech32 address from bitcoin-qt GUI. The problem is after selecting the specific coin ...
1
vote
1answer
118 views
Concept of Block weight and segwit are still unclear
It seems like duplicated question, but i read many articles and posts to undestand about segwit.
Below links are something i read
What is block weight and how is it different from block size?
After ...
4
votes
2answers
166 views
On chain cost of Segwit version 1 versus version 0
How do total blockchain cost for Segwit version 0 compare to version 1 which is being proposed? I'm specifically interested in a single user transactions – both paying to public key (or pk hash) and ...
1
vote
1answer
47 views
What is the O(n^2) signature hashing problem and how does SegWit solves it?
One of the many benefits of SegWit is that it solves the O(n^2) signature hashing problem. What exactly is the O(n^2) hashing problem and how segregating signatures to separate witness field solve it?
1
vote
1answer
229 views
Multisig scripts hashing (p2sh): difference between legacy and segwit
Some time ago I noticed that, given the same inputs, addmultisigaddress and createmultisig Bitcoin core's methods were generating different p2sh (addresses).
I asked around and a user from the ...
4
votes
1answer
95 views
Does v1 Segwit includes v0?
My question is whether the version 1 of Segwit script will allow you to use version 0 scripts types inside of it. In other words, is version 1 superset of version 0? Please include reasoning behind ...
1
vote
1answer
87 views
Why do most exchanges still have not implemented segwit bc1 addresses to save block space?
Segwit bech32 bc1 addresses has been out for a good 2 years. Why do most exchanges still refuse to implement such a feature for its users? Exchanges create a bulk of the bitcoin transactions and also ...
2
votes
1answer
406 views
How can a third party spend BCH accidentally sent to a BTC address?
I transferred BCH to an Electrum wallet address and haven't ever received it because Electrum uses only BTC. As I have been trying to recover it, I looked up the transaction on explorer.bitcoin.com ...
1
vote
1answer
305 views
Are there still miners or mining pool which refuse to implement SegWit?
It was well known that initially while SegWit got more than 50% of hashrate after activation that a part of the mining pools refused to implement it.
But are there still blocks being mined by miners ...
2
votes
1answer
456 views
How to calculate segwit transaction fee in bytes?
I'm trying to calculate SegWit transaction fees in bytes, I have two Segwit inputs and 2 segwit outputs. can anyone calculate this transaction fees if I'm paying 100 Sat per byte?
8
votes
2answers
4k views
Bech32 conversion to legacy P2PKH?
Electrum now generates Bech32 addresses for SegWit wallets.
Example: bc1qnntcclssmtuvfw2te7q49lzvw67cfvpzxger4j
Pubkey: 023f1b3421c6ae0c1758834d40806c2418194b507be261fa343a0636653f3ec75b
If I ...
1
vote
0answers
60 views
Stripped segwit data
I have two client Bitcoin, 0.17.0 and 0.12.0 and I want to see the difference between the same transaction.
0.17 has segwit, 0.12 doesn't have.
If I do that RPC call in 0.17.0
/bin/bitcoin-cli -...
1
vote
1answer
246 views
Why do we need SegWit (technical explanation)
After reading a lot of articles, whitepapers and videos I am still confused why do we need SegWit an Lightning instead of just bigger blocks. I don‘t want to debate Bitcoin vs Bitcoin Cash but what ...
1
vote
1answer
304 views
Bitcoin segwit addresses from HEX
I loved those two
https://github.com/grondilu/bitcoin-bash-tools
https://www.bitaddress.org/
because you can convert HEX into WIF private key.
Is there something similar what allows to create ...
5
votes
2answers
67 views
Why SHOULD the funding tx consume BIP 141 inputs?
In BOLT 02 we read that the funding TX should only consume segwit inputs.
The sender: when creating the funding transaction: SHOULD use only BIP141 (Segregated Witness) inputs.
What is the reason ...
4
votes
1answer
152 views
Does segregated witness allow to securely create LN channel opening transactions?
In Rusty Russell's paper about the simplified version of the Lightning Network, some problems about the practical implementation of the opening channel method from the original LN paper are mentioned:
...
4
votes
1answer
691 views
Qualities of “Pay to Nested Witness Key Hash”
The lightning dev tutorial mentions the np2wkh or Pay to Nested Witness Key Hash address type, and I would like to find out more about it, so far without success.
Can anybody explain how they are ...
5
votes
2answers
432 views
Has UTXO selection methods changed since activation of Segwit?
Before Segwit, transactions were penalized higher fees for having more inputs than outputs due to the input size being larger despite those transactions actually decreasing the global UTXO set. Segwit ...
1
vote
1answer
54 views
Failed CHECK(MULTI)SIG operation - BIP143 hash pre-image
Using Blockstream's api to broadcast a raw transaction to the Bitcoin testnet, I encountered the following error:
sendrawtransaction RPC error: {"code":-26,"message":"non-mandatory-script-verify-flag ...
0
votes
0answers
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
vote
2answers
438 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
votes
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
43 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 ...
6
votes
1answer
471 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 ...
0
votes
0answers
39 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
votes
1answer
124 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
votes
1answer
154 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
858 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
200 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
777 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?
1
vote
2answers
111 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
votes
0answers
24 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
vote
1answer
188 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 ...
7
votes
2answers
2k 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
60 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:...
