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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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 ...
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38 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 ...
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1answer
126 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-...
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1answer
54 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 ...
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1answer
44 views

Following SegWit implementation, is BIP-146 signalling and implementation still on the docket?

Is BIP 146, which defines using the low S value, still on the docket to be signalled and implemented given that SegWit fixed the txid malleability issue by moving the witness outside the transaction? ...
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1answer
552 views

Segwit Address Supporting Testnet Faucet

Looking for a good Segwit supporting testnet faucet and preferably one that supports P2WPKH addresses, however answers that allow only P2WSH are fine too.
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38 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 ...
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1answer
412 views

Converted Segwit address (YPUB) to Legacy (XPUB), but balances differ

I'm trying to convert a Segwit YPUB address I got from a Ledger Wallet to a Legacy XPUB address in order to query the transactions from the wallet. I've yet to find a reliable API that supports YPUB ...
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1answer
41 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 ...
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2answers
103 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 ...
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1answer
40 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?
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99 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 ...
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1answer
69 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 ...
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1answer
47 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 ...
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1answer
75 views

How to sweep a bc1… bitcoin segwit address using a mobile app?

I have a bitcoin private key with some money on the segwit bc1 address, but when I try to sweep this private key using mycellium android wallet, it shows up as a 3... address. What other mobile app ...
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1answer
747 views

Can Bitcoin Diamond be claimed on Segwit addresses?

I currently have my Bitcoin (BTC) on a Trezor hardware wallet with Segwit (Not in a "Legacy account"). Can I claim Bitcoin Diamond (BCD) with this or not? In general: Should I move my BTC to a ...
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2answers
499 views

Segwit Addressed from xpub key

How can i get the public key of my segwit address with my extended public key. when i import the xpub into electrum it automatically creates a legacy wallet for me. i'm not with my nano and won't be ...
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1answer
297 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 ...
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1answer
224 views

Pycoin: How to sign SegWit transaction via Pycoin?

My target is to make transaction with unspent transaction outputs(UTXOS). The information of UTXOs is as follow. [ { "pt_idx": 0, "subaccount": 37, "ga_asset_id": 1, "value": "...
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1answer
261 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 ...
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1answer
129 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?
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2answers
3k 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
33 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 -...
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1answer
222 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 ...
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1answer
193 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 ...
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1answer
283 views

What is a “serialized signed transaction”?

Shown in the gray area here, describing how to apply, I think, Segwit to a transaction (particularly a Bitcoin Cash tx). The last section is titled "serialized signed transaction" however it doesn't ...
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2answers
53 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 ...
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1answer
149 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: ...
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1answer
561 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 ...
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2answers
372 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 ...
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1answer
34 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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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
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352 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 ...
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1answer
34 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 ...
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1answer
335 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 ...
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2answers
191 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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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?
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1answer
65 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 ...
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1answer
123 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 ...
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1answer
793 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. (...
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1answer
151 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 ...
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1answer
637 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
100 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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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 ...
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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 ...
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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?
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1answer
123 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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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?
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1answer
46 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:...