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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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1answer
46 views

Signmessagewithprivkey result is different than txinwitness

I'm studying segwit and I'm doing some experiment in regtest. I create a raw transaction with P2SH address. My Transaction data without signature is: ...
0
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1answer
29 views

How to generate legacy receiving address in Bitcoin core 0.19.x.x

I must have missed the memo. I see Bitcoin Core 19.1.0.1 defaults to generating Bech32 receive addresses (prefixed with "bc1"), and offers a checkmark to generate P2SH addresses instead (prefixed ...
2
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1answer
122 views

How to calculate p2wsh signature?

I read the bip143, but didn't understand how to calculate the scriptCode of p2wsh. bip143 told us: A new transaction digest algorithm is defined, but only applicable to sigops in version 0 witness ...
2
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1answer
377 views

Why does segwit save space on the blockchain?

I've had a hard time finding a good source online that explains segwit. I've read the basic idea is to store the scriptSigs separately as the scriptSig is potentially malleable, and then compute the ...
4
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2answers
471 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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1answer
98 views

What Does “Activation” Actually Mean In Bitcoin?

During the multiple issues with Bitcoin this year with soft and hard forks, and Segwit, I have read as much as I can about how all these changes are "deployed", eg BIP9, BIP91, BIP148, BIP's 141-146. ...
3
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1answer
764 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 ...
0
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1answer
28 views

What is the signature digest for Segwit outputs

(Assume there's no OP_CODESEPERATOR) For standard P2PKH, the signature digest is generated this way: NewTransaction settle the TxOuts well set all TxIn scripts to empty insert the Previous Locking ...
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1answer
255 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": "...
3
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1answer
53 views

Why does a same transaction signed separately have different witness values?

I signed a bitcoin testnet transaction using nbitcoin library and got an output: ...
0
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1answer
59 views

In practice, are redeemScripts commonly reused?

In regards to P2SH-P2WSH transactions, are Txout-script values identical between transactions? Is it reasonable to expect a business or vendor that accepts bitcoin to be using the same redeemScript ...
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1answer
320 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 ...
3
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1answer
45 views

Why is a 20 byte hash acceptable in p2wpkh but p2wsh needs 32 bytes?

Why is it acceptable to use a 20 byte hash to represent single-sig witness programs whereas a 32 byte hash is used for pay to witness script hash?
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0answers
29 views

How do I ask for witness data from a Bitcoin full node?

So, I'm trying to build a Bitcoin block explorer using my own Python library. I'm doing it just as an exercise to better understand how Bitcoin works under the hood. Right now, when I send a block ...
0
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3answers
119 views

Convert bech32 Bitcoin address to legacy

I know that similar tools exist for BCH (e.g. https://cashaddr.bitcoincash.org/). Is there a way to convert a native segwit bech32 Bitcoin address to a legacy format?
6
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2answers
2k views

What is a fraud proof?

In Pieter Wuille's presentation on Segregated Witness, he often mentioned "fraud proofs". What exactly are they? Do physical users actually have to go out of their way to manually produce these proofs ...
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0answers
43 views

Issue generating private Key and segwit address with python

I used the following script to generate my private key and the corresponding segwit address. Then to test it, i sent funds to the address and imported the private key on blockchain wallet; RESULT: ...
0
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1answer
33 views

What is the scriptCode in a P2WSH transaction?

Let's say I am spending from a 2-of-2 multisig with this script: ...
2
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2answers
235 views

Is Segwit really safe and reduced?

In the Segwit rules, transactions propagated to legacy node doesn't have any signature. so it will be valid as well as in terms of fresh node(supporting Segwit). First question: In this point, if ...
1
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1answer
35 views

How a SegWit transaction is accepted without witness?

I would like ask 2 questions. First, as perspective of legacy node(doesn't upgrade software): When SegWit transactions are transferred, witness data is stripped. It means that there are no signatures ...
2
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1answer
45 views

Does my segwit node only have segwit blocks?

My segwit node makes a gettxout RPC query and checks the scriptPubKey.type is "witness_v0_keyhash" and does things accordingly. To my understanding old nodes have different blocks and if I happened ...
2
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3answers
2k views

What is the Witness and what data does it contain?

I've learned about the Segregated Witness but couldn't find info on breaking it down. I know usually when legacy addresses are used the public keys for example will be under Scriptig. With P2SH, I ...
1
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2answers
659 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 ...
2
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1answer
34 views

Parsing stripped-witness blocks

I've read all the relevant BIPs, and am still confused. Are segwit enabled blocks stripped of witness data and marker and flag bytes when they are propagated to non-segwit peers? Or are they just ...
3
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1answer
136 views

Would a Schnorr PubKey be a different length than a Taproot PubKey like P2WPKH and P2WSH?

A P2WPKH PubKey is shorter than a P2WSH PubKey. Would this also be the case that a Taproot PubKey is larger than a Schnorr PubKey? If so, wouldn't people be incentivised to use the Schnorr PubKey and ...
4
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1answer
418 views

What is 'ScriptCode'?

I don't understand what the 'ScriptCode' thing is. Is it a part of transaction format? The wiki https://en.bitcoin.it/wiki/Transaction describes scriptPubKey and scriptSig, mentioning nothing about '...
-2
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1answer
37 views

Bitcoin And BitcoinCash Input Value [closed]

According to bip 143 (https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki), bitcoin transaction has the information about the input value as part of the witness. i heard bitcoincash has ...
3
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2answers
1k views

SegWit, Bitcoin JSON-RPC and (strange?) addresses

I'm trying to analyse this transaction: https://blockchain.info/tx/a388d6f88373aacf2a5c170eeff4adf51f2c6744da26375d5890f42d653a2e6c I used to be able to just run bitcoin-cli getrawtransaction txid 1 ...
6
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1answer
2k views

Which block explorers recognize bech32 addresses?

At this time, blockchain.info doesn't. Neither does blockchair or blockcypher.
4
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2answers
170 views

What is the point of including the scriptCode of the input in the transaction digest of segwit?

BIP143 specifies "a new transaction digest algorithm". scriptCode of the input (serialized as scripts inside CTxOuts) What problems could arise if the scriptCode of the input were not ...
1
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1answer
68 views

Error Signing P2SH-P2WSH MultiSig - “Unable to sign input, invalid stack size (possibly missing key)”

I am trying to create and spend a P2SH-P2WSH transaction using bitcoin-cli but am getting "Unable to sign input, invalid stack size (possibly missing key)" when I try to sign the Multi-Sig transaction ...
1
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2answers
127 views

Bitcoin API with bech32 support

Since a while, I have been using the insight-api to view bitcoin transactions. However, recently I have found out that bech32 addresses are not supported. Now I try to fix this issue and I am open ...
0
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1answer
47 views

How to spend from a segwit address generated by a legacy wallet?

I used atomic pay payment gateway and a segwit address was generated by XPUB key i'm unable to spend the coins i sent to the generated address and coins are not visible in my legacy wallet what to do ?...
7
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2answers
503 views

Most efficient way to store Segwit Address in a database

This is not a duplicate of What is the most efficient way to store bitcoin addresses in a database? but it's the same question except I need a segwit answer. Let's say I wanted to store every ...
0
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1answer
56 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? ...
0
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1answer
652 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.
-4
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1answer
897 views

Could miners possibly steal SegWit transactions on The Real Bitcoin? [closed]

Going to be lolz epic when all the SegWit transactions are double-spent, i.e. stolen by miners on The Real Bitcoin (the legacy Satoshi blockchain). Can anyone offer any refutation, confirmation, or ...
4
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1answer
79 views

How has the Bitcoin average block size recently risen above 3 MB?

I was aware that the block size could rise above the 1 MB cap due to SegWit. However, my understanding was that the block size would still be limited under SegWit. My understanding of SegWit is that ...
1
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1answer
130 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 ...
0
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2answers
636 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 ...
0
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1answer
30 views

Witness data storage localisation in the blockchain

Since segregated witness is in place inside Bitcoin blockchain, my understanding is that witness data are no longer stored inside the blocks, so if blocks are linked to each other where theirs ...
1
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2answers
56 views

How does storing the witness outside of the block prevent malleability?

I have some question on how segregated witness work. I'm reading this post and in the answer exist this phrase Since signature data (witness data) is stored outside the transaction (and outside ...
15
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1answer
11k views

How to generate SegWit address

How do I generate a SegWit address using Bitcoin Core CLI? Also will I be able to redeem those outputs and send them to a "legacy" address? If so, will this second transaction be accepted by older, ...
0
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1answer
37 views

How Segwit makes transactions smaller? What about the witness?

I have seen similar questions without a clear answer. So, how does Segregated Witness make transactions smaller? I understand it removes data from the transaction hash and solves malleability ... But ...
0
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1answer
84 views

Javascript library or code that can convert an “uncompressed” bitcoin private key to a compressed one

I forked a pretty old brain wallet generator: https://dvdbng.github.io/memwallet/ -- Currently it generates uncompressed bitcoin private keys. Is there a javascript library that can convert an ...
6
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2answers
335 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
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0answers
57 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
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1answer
70 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
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2answers
79 views