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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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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 ...
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1answer
177 views

How do I calculate the witness commitment hash for a given block?

From my understanding, every SegWit enabled block has an added output script which is used as a place to store the "Witness commitment" specified in BIP 141. One issue I've stumbled upon was ...
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1answer
87 views

Where is the pubkey for segwit inputs?

Normally when you spend an input, you reveal your public key and signature so that ECVERIFY can be done. I look at segwit raw transactions and cannot find the public key inside them, where do they go?...
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1answer
283 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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45 views

Is there any format change in block #498557

I wrote some python code to parse the block data, all the result are fine, until block01095.dat, block #498557. The code to deal with Transaction is: class Tx: def __init__(self, blockchain): ...
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I sent BCH to a segwit btc address, how can i get it back? [duplicate]

I accidentally sent bitcoin cash to a segwit bitcoin address, please can anyone help me on how i can get it back. i tried using this recovery service, https://bch.btc.com/docs/help/...
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1answer
292 views

sent BCH to a BTC Segwit address [duplicate]

Is there a way to recover the BCH ? Use his Ledger purse I've sent BCH To address BTC Segwit This link is treated https://explorer.bitcoin.com/bch/address/36CU6nDniJca1UVhvNhjsDdZpUsyYw5vSx I want ...
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119 views

Access funds on legacy address related to segwit address from which I have private key

The situation Hello. Our company running BTC pool. We've been mining BTC for a while and used segwit address 32Z3eXSPgxcHj2fnQy8d6dg66eVtZfxrBM as pool adress. But when we finally found a first ...
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1answer
318 views

Can you retrieve funds send to a legacy address created with a Segwit extended private key imported in Mycelium from a Ledger Nano S?

I imported a segwit xpub6-key in Mycelium as a watch only address. It only shows address starting with 1 instead of 3, which makes sense. I retrieved a small amount on the legacy address and it shows ...
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237 views

What exactly is hashed and signed in a segwit transaction

I have an unsigned raw segwit transaction on my regtest network: ...
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33 views

Are higher versions of segregated witness script non-standard?

My understanding is that only version 0 is defined but other versions are considered valid to allow extensions using soft forks, but are they non-standard at the moment?
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42 views

Segwit versioning limitations

Currently my understanding is that if new version of Segwit script is introduced, you are free to create whatever crazy rules you want there as long as they do not go against any valid consensus rules....
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2answers
81 views

Do legacy nodes receive the witness fields of a Segwit transactions?

My question comes from not understanding how BIP 144 works? Regarding the BIP what I ask is, whether legacy nodes support the new parser, so that they treat Segwit tranasctions as valid? There it is ...
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1answer
149 views

Derive the bech32 address from the transaction 'txinwitness' witness data in Bitcoin Core 0.16

I'm trying to extract the bech32 address associated to an input or output using the txinwitness field included in every pure SegWit transaction. An example with transaction ...
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1answer
191 views

Segwit transaction in golang

I tried to create transaction which spends p2sh(p2wpkh) output: from wif I derived compressed pub key: "035476e55521c97cf0489e6c57893a99d67e84d306a69e6b6904f324c11b3cef8d". created witness program: "...
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0answers
78 views

What are segwit extended key prefix bytes for regtest?

I need the HD version bytes for equivalent of ypub, zpub, Ypub, Zpub but on the regtest network. I also need Ypub on testnet. All the rest I can find in slip132, but it is incomplete. thanks.
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1answer
458 views

How to verify if it's Segwit Transaction or not?

Segwit Usage chart example : https://p2sh.info/dashboard/db/segwit-usage?orgId=1 I Would like to verify by checking tx if it's Segwit Transaction or not. Is there any simple method to do this? ...
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3answers
810 views

What is Witness and what data does it contain?

I've learned about the Segregated Witness but couldn't find info on braking it apart. I know usually when legacy addresses are used the public keys for example will be under Scriptig. With P2SH, I ...
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2answers
58 views

Do lightweight wallets validate signatures? If not, why?

I've learned that "some SPV clients simply don’t check signatures themselves at all": https://bitcoincore.org/en/2016/01/26/segwit-benefits/#efficiency-gains-when-not-verifying-signatures I wonder if ...
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1answer
50 views

P2PUBKEY in witness program (P2WPUBKEY)

Old standard transactions format included 3 types: P2PUBKEY, P2PKH, P2SH. After Segwit soft fork, we have got 2 additional types: P2WPKH and P2WSH. If we compare the cost of spending inputs (in bytes ...
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1answer
401 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
76 views

What are segwit txs?

Which one is a segwit tx? A Tx that send outputs to a segwit address or A Tx that create inputs along with witness part? Which one? should segwit tx necessarily produce outputs of type ...
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2answers
836 views

16: bad-txns-vin-empty. Code:-26

I am trying to push a raw transaction via BTC insight API, but I always get an error message: 16: bad-txns-vin-empty. Code:-26 Here is the raw transaction hex: ...
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1answer
727 views

How to generate a native Segwit address and P2SH Segwit address from a standard WIF?

Can I have the steps to generate a native Segwit address from a standard WIF? And the steps to generate a P2SH Segwit address from the same WIF? How do these two formats differ and why are there two?...
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1answer
118 views

how to verify the first segwit litecoin transaction?

I know than the first litecoin segwit transaction was put to blockchain in 2017/05/10, and it seem that no signature in witness data, how this transaction signed and verified? https://chain.so/tx/LTC/...
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Post SegWit Inclusion, how long until Lightning Network is included in the core?

Introduction - Reason for asking this question With most of the money in the cryptocurrency domain still being utilized in transactions on crypto-exchanges and the numerous hacks that have previously ...
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2answers
124 views

How does a non-segwit full-node validate a SegWit input

From segwit part of reading bitcoinbook, there is an example for upgrading P2PKH to P2WPKH: Alice created a transaction to pay Bob for a cup of coffee. That transaction created a P2PKH output ...
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1answer
216 views

ELI5: How does Segregated Witness (segwit) work?

Can someone ELI5 Segregated Witness (AKA BIP 141)? I've been doing research and understand that there are segwit addresses, there are segwit transactions, and there are segwit nodes. I understand ...
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1answer
153 views

Why do we need public key as part of Witness in P2WPKH transactions?

As we want to minimize the data payload in a blockchain, which also led to concepts like SegWit, and is matter of discussion in Signature aggregation etc, I wonder why do we actually need to supply ...
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1answer
479 views

How to check ownership of wallet with segwit address

So .. this seems like a simple question. If i have a wallet and someone wants to send me BTC. I want to make sure they own the wallet they claim to be sending funds from. Usually people do something ...
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2answers
175 views

Why non-SegWit nodes do not reject SegWit block since there is no witness?

SegWit is meant to be backward-compatible. When a SigWit block is relayed to a non-SegWit node, the witness part is stripped. If this is the case, wouldn't it be invalid since the non-SegWit node sees ...
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2answers
515 views

Bitcoin - Technical difference between P2PKH and P2SH address generation?

I was convinced that the only difference between the generation of addresses starting with '1' and '3' was simply changing the prefix added to the digest from 0x00 to 0x05 after the ripemd160 part. ...
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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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What the difference between old segwit (3) and new segwit address (bc)?

i'm not that kind of person who understands cryptography and math, can you tell me simply the main purpose of new segwit address? are transactions fee the same for new segwit (bc1)? instead of "Old ...
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1answer
61 views

On SPV clients and Segwit

An article released by Blockstream claims that after Segwit, SPV clients can verify that transactions have been accepted by the network without having to download the signatures/witness-data. I'm ...
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1answer
35 views

Is it more profitable to mine non-SegWit blocks

The fees for a SegWit address are lower than non-Segwit ones. Is there less fees per block with Segwit blocks? Is it less profitable to mine Segwit blocks?
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1answer
108 views

How does a non-segwit full node ensure validation of the blockchain?

Let's say a block been created with most tx are segwit , now the block is more then 1MB and will be near to 4MB, I understand that a non-SegWit node ( let's say bitcoin-core 0.15 ) cannot get a block ...
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1answer
372 views

OP_RETURN in a coinbase transaction?

Hey looking at this transaction I'm confused why there are two outputs and why one of them is labelled with OP_RETURN
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1answer
117 views

Extract lightning network funding transactions with python bitcoin blockchain parser lib

My ultimate goal is to parse funding transactions (as well as channel closes in a later step) from the blockchain. In order to do so I wanted to start with a funding transaction and disect it. ...
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1answer
549 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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1answer
368 views

What are the standard formats of transaction outputs?

A transaction output can have the type Pay to public key hash, P2PKH, where the ScriptPubKey field has the format: 76 a9 14 <20-byte hash of pubkey> 88 ac Pay to script hash, P2SH, used for e.g. ...
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250 views

SegWit - what is the address I need to deposit to?

I'm using bitcoin core 0.16.0 on regtest and call getnewaddress I'm getting "2N4dpih8KAdfJyXn2vhWixUwmYJ6DBfeRM1" As I call validateaddress "2N4dpih8KAdfJyXn2vhWixUwmYJ6DBfeRM1" I get:  { "isvalid"...
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1answer
183 views

BIP 84, BIP 173 Implementation in BitcoinJ

Can BitcoinJ (Java) supports complete implementations of BIP 173, BIP 84? How can segwit address can be created using BitcoinJ for SPV wallet?
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211 views

How to add support for segwit address and legacy with bitcoin core 0.16?

I've been running bitcoin core 0.15 as regtest, and had X bitcoin in my balance all are from legacy output addresses, As I upgraded to 0.16 core version check in debug the legacy addresses are still ...
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Can you broadcast a segwit transaction using a non segwit node?

If non segwit nodes view segwit transactions as anyone can spend ,why can't you broadcast a segwit transaction using them?
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166 views

Using BitcoinJS - How do you verify a message using a segwit bech32 (bc1…) / P2SH (3…) addresses?

I created a signature from a message using my private key. But how do I verify this signed message using my segwit addresses of 3... or bc1...? How do I verify this using the BitcoinJS library?
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How to send Bitcoin Cash from BTC segwit address?

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 ...
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1answer
143 views

What prevents anyone from spending utxos from a native segwit address?

I read that transactions spending utxos from a native segwit address ( an address starting with bc1) are seen as anyone can spend transactions by legacy nodes. So what prevents someone from taking a ...
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1answer
479 views

How do you output segwit bech32 (bc1…) / P2SH (3…) addresses from a bitcoin private key?

I have a bitcoin private key and know that it can output a segwit addresses of bech32 bc1... and p2sh 3... formats. How can this be done easily?
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646 views

How to sweep a segwit bech32 private key?

I'm testing segwit bech32 addresses and generated the following using bitcoinjs: address: bc1qc7u5njf4nf2rj3zys642mfc7nct6kdven8j4e9 private key: 5Kkzs8XrJNAmf9VQDFeGBfaRvSByAvPK6DbDXw5BVqswWaXSG2Y ...