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).

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10
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2answers
6k views

Bech32 conversion to legacy P2PKH?

Electrum now generates Bech32 addresses for SegWit wallets. Example: bc1qnntcclssmtuvfw2te7q49lzvw67cfvpzxger4j Pubkey: 023f1b3421c6ae0c1758834d40806c2418194b507be261fa343a0636653f3ec75b If I ...
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0answers
97 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
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1answer
252 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
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1answer
342 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
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2answers
75 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
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1answer
156 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: ...
5
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1answer
842 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
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2answers
477 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
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1answer
80 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 ...
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0answers
26 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
626 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). ...
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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
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1answer
57 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
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1answer
610 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
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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
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1answer
167 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
177 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
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1answer
884 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. (...
2
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2answers
118 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. ...
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4answers
2k 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
281 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 ...
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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
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1answer
130 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:...
1
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1answer
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
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1answer
34 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
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1answer
486 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 ...
3
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2answers
394 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.
2
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1answer
98 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
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3answers
656 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
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2answers
253 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
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1answer
226 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
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1answer
56 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
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2answers
321 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": ...
5
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2answers
3k 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
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1answer
336 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.
5
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2answers
174 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?
1
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2answers
101 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 ...
4
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1answer
1k 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
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1answer
50 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
184 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 ...
0
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2answers
201 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
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1answer
208 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
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0answers
228 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
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2answers
120 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
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2answers
72 views

Transaction order in the blockchain

What is the difference between segregated witness (segwit) and canonical transaction ordering (CTOR) ?
6
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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
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2answers
385 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
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1answer
120 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
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1answer
172 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 ...
6
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1answer
1k 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 ...

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