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
178 views

Which full node implementation(s) supports SegWit

I just finished setting up a full node using bitcore.io's guide here. I need my node to support SegWit though and I am not entirely sure whether what I have set up offers SegWit support. Especially ...
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2answers
1k views

What is block weight and how is it different from block size?

While reading about BIP141, I have encountered the following options: Block creation options: -blockmaxweight=<n> Set maximum BIP141 block weight (default: 3000000) -blockmaxsize=<n> ...
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2answers
321 views

How do I store coins during the bitcoin segwit2x hard fork?

Where should I securely store my coins during the fork? A Legacy address or a Segwit address? I keep them on a Segwit address right now but I want to be sure that the fork won't affect my funds if ...
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1answer
192 views

Complete definition of 'tx_witness' data structure used in 'tx' data structure

I'm reading the Protocol Documentation page for the 'tx' data structure and cannot find a completely clear definition of the 'tx_witness' data structure. After the 'tx_out' table, there is short ...
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1answer
428 views

How does Segwit achieve backwards compatibility in terms of the block size? [duplicate]

If SegWit results in production of blocks that are larger than 1MB, how do old nodes see them as valid, instead of rejecting them due to exceeding the maximal allowed size of 1MB?
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1answer
824 views

Sending funds from a Segwit address to a non segwit

I just generated a Electrum wallet with the Segwit option on. I wonder what happens if I try to transfer SegWit -> Non-SegWit or Non-SegWit -> SegWit: Will the funds be confirmed and get transfered or ...
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1answer
449 views

How do I determine whether an input or output is segwit?

I'm trying to go through the transactions in a block and determine how many segwit inputs or outputs there are. I've noticed in getrawtransaction that segwit inputs seem to have a 'txinwitness' field....
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1answer
363 views

Generate Bech32 addresses to receive customer funds

I would like to use Segwit addresses however I seem to be finding mixed information on compatibility. As I currently understand it, older clients will not be able to send to a Bech32 address. Is this ...
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1answer
241 views

Can I use bitcoin-cli estimatefee API for Segwit?

I'm using estimatefee API to calculate transaction fee for Non-Segwit. I'm using this formula now. size = 180 * len(inputs) * 34 * len(outputs) + 10 necessary_fee = int(size / 1000 * fee_per_kb) ...
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1answer
245 views

Will Segwit embedded inside P2SH save fee compared to P2PKH?

How much transaction fee will Segwit embedded inside P2SH save fee compared to P2PKH? Update 1 I found a similar question. or they can be nested in a legacy P2SH 3... address which are backwards-...
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1answer
301 views

how to get address from transaction with empty ScriptSig?

look here https://blockchain.info/tx/d4223672c9043c17a2775abde858778fca38b53152e165757188ab747850770e why does address start with bc1q... ? Is it some standart? How can I derive this value from ...
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1answer
1k views

What Do SegWit Addresses Look Like?

Probably a question that has been asked a lot before, but how do I know if an address I generate with bitcoind and bitcoin-cli is SegWit? I take the following steps to (attempt to) generate a SegWit ...
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Segwit has been locked-in since Aug'17, has it been activated? If so, why are the communities not implementing it? [duplicate]

Since locked-in Segwit, why most exchanges, wallets & miners are not implementing it. Market complained BTC is slow & costly to transact now. Segwit did improved both, yet acceptance by ...
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2answers
156 views

Does segwit solve malleability of the witness part?

I understand that after segwit the transaction ID can't be malleated, but can't the witness part be malleated, just like the scriptSig can in a non-segwit transaction?
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HD Wallets - Generating P2SH-P2WSH Addresses from a ypub-type mpks in PHP?

I am writing a webapp in PHP that needs to generate Bitcoin addresses from their mpk. I have successfully done it for P2SH addresses (starting with a 1, with a xpub mpk) using the BitWasp php library,...
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1answer
106 views

Why does P2SH-P2WPKH use DER encoded signatures?

If we simply assumed 32 bytes of r and s each, then signatures can be 64 bytes. Now they are on average 71 bytes in DER plus an additional byte to declare their size, effectively making them use 72 ...
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2answers
1k views

How does SegWit reduce transaction size, when the signature is simply moved to another part of the transaction?

This video explains that the signature is moved out of the input section and moved to the new one called the witness. From what I can tell, the witness signature is still contained in this transaction ...
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1answer
320 views

Can I use same WIF/privkey to make myself a segwit address?

I think I know the answer, but want to make sure asking here. I have my old privkey/WIF and some funds on associated legacy bitcoin address. Reading this code https://github.com/bitcoinjs/bitcoinjs-...
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1answer
745 views

Get public key of SegWit address

I'm using bitcoin-cli and I need to get the public key of one of my SegWit addresses. My first attempt was to use 'validateaddress' command and take the 'scriptPubKey' field but that doesn't seem to ...
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2answers
233 views

Is there a reason big Bitcoin companies wouldn't use only SegWit transactions?

As I understand, SegWit allows anyone to create a SegWit address where they can send their bitcoins and transact from that wallet just as easily as they would with a traditional address. The SegWit ...
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1answer
70 views

Which BIP-148 branch is the most recommended?

I want to run an BIP-148 ("segwit UASF") node. However, I am not sure which of the various branches is most maintained and recommended to run. There is this pull request by earonesty (386 commits ...
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3answers
2k views

Calculate Segwit address from public address

I would like to calculate the segwit address of a public address. First step: take the compressed public address: 1L88S26C5oyjL1gkXsBeYwHHjvGvCcidr9 do a sha256 on that address: ...
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2answers
318 views

Send Bitcoin cash to a Bitcoin address

by doing a mistake i have send BCH to my BTC address into my own Wallet,the wallet is Bitgo i know they have a tool to recover the BCH when they are send to a non segwit address i have already tried ...
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1answer
128 views

Will Core ever adopt Segwit by default?

There is no excuse for current companies that do not adopt Segwit. It looks very scammy. However, does Core plan to adopt Segwit by default at some point? Is it a matter of money or anything else? ...
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2answers
1k views

generate a P2SH-P2WSH address and spend output sent to it

I am attempting generate a P2SH-P2WSH address and then spend an output sent to this address, but when I attempt signing I receive Invalid private key error from bitcoind (v0.15.1.0). So where am I ...
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1answer
71 views

Node doesn't find segwit transactions

I had to move around wallets and so on, and when I re-installed Knots (yeah I'm that edgy), it doesn't find the transactions to my segwit addresses. I can probably find the SW addresses somewhere, but ...
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1answer
161 views

Who witnesses a Segregated Witness transaction and what incentive do they have to witness the extended block containing signatures?

This video claims Segregated Witness is insecure because no one has an incentive to process (witness) the extended signature block. https://www.youtube.com/watch?v=VoFb3mcxluY It claims that as the ...
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1answer
74 views

Can SegWit block weight be increased without a hard fork?

I know segwit's block weight is 4MB. Can it be increased without a hard fork? If no, was that option even considered, and is it even possible?
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2answers
313 views

What changes did segwit do to minimum transaction fee?

If I understand this correctly, at the beginning, the minimum fee was 0, than it was .0001. Now, I can see that you can enter some really small amounts as fee for the transaction, however, with ...
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0answers
128 views

Why bitcoin does not generate and support Segwit addresses by default automatically?

I downloaded the latest bitcoin core, but the generated wallet and address was not a segwit. Why bitcoin core, does not support segwit by default? and when it will be changed?
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1answer
661 views

Transaction verification by miner VS full node with & without SegWit

I'm trying to fill a few gaps in my understanding of transaction verification and would appreciate any insight. Without SegWit Miners broadcast new blocks which contain the signature(s) with every ...
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1answer
83 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. ...
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3answers
275 views

If SegWit only increases the capacity to only 2-4x only. Wouldn't we have the same issue in a few years again?

If I understand correctly. SegWit is one of the solutions to the full 1MB block problem that doesn't require a hard fork. But I've read this only increases the 1MB to maybe about 2-4x only. If that is ...
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0answers
205 views

pyminer for getblocktemplate/segwit?

I'm trying to resurrect my simpleminer.py script, based on pyminer, for use with Bitcoin 0.13.2 but the changes to the code over the last few years are overwhelming. I found out how to use ...
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1answer
252 views

Which branch of bitcoinj should I sync to?

I am experimenting with Bitcoinj to design a stable node that is synced. Older versions of bitcoinj seem to drop connections and stop syncing. I currently see the following branches (see screenshots)...
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1answer
324 views

P2SH-P2WPKH private key or revert to P2WPKH

Is there a way to get the private key out of an P2SH-P2WPKH address, using Bitcoin Core 0.15.1? If not, is there a way to get the origin P2WPKH address to get the private key out of this address?
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2answers
762 views

Segwit transaction from mixed addresses (segwit and non-segwit)

Is it possible to have partly segwit transactions? I.e. some utxos from segwit addresses and some from non-segwit addresses. Asking for the situation of Bitcoin core v0.15 wallet with coins in segwit ...
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3answers
250 views

Why do non-SegWit clients send witness data in the first place?

If SegWit leaves out witness data for backwards-compatibility, thus witness data isn't so important apparently, then why do clients even send that data in in the first place? Aren't they making their ...
4
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1answer
558 views

(dis)Advantages of migrating funds to segwit?

For offline pre-segwit wallets (addresses starting with 1) what might be the advantages of migrating or not migrating to segwit (addresses starting with 3)? Even though segwit miner fees are or will ...
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1answer
850 views

Would migrating my coins to a segwit (bc1) address reduce my fees as I send them out?

Currently fees are a bit ridiculous when sending from mycelium. I'm thinking of migrating all my coins to electrum 3 as a segwit (bc1) address. Then, would my fees be smaller? And if I exclusively use ...
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1answer
441 views

Why does SegWit offer P2SH nesting?

I'm reading about SegWit and the BIP 141 in particular and I don't understand what is the motivation behind the P2SH nesting. At first I thought the P2WPKH is not valid on non-upgraded nodes, so ...
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1answer
498 views

How to properly backup a address with private key after 'addwitnessaddress' command

I've received my balance to my addresss that starts with 3 which is after 'addwitnessaddress' command. I'd like to know that how do I properly backup my balance to keep safety. Bitcoin Core has a ...
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1answer
2k views

How to get legacy address and private key from Segwit P2SH address?

I have a Segwit P2SH address (starting with 3...) with the corresponding private key and need to obtain the legacy address (starting with 1...) and the private key. Is this possible?
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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 ...
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1answer
153 views

What is the maximum size for SegWit transactions?

Before SegWit was activated, transactions were limited to 100,000 bytes or 100 kB. Bigger transactions were non-standard. What is the limit for transaction size after the activation of SegWit? Is ...
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2answers
770 views

SegWit. Redeem script

I'm experimenting with Segwit transactions. Is it possible to restore redeem script, if I know 1. Address (Segwit) 2. Public key 3. Private key Thank you.
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1answer
318 views

Which wallets can send to native segregated witness output addresses today?

Which wallets today are able to send to P2WPKH addresses starting with bc1qf…?
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0answers
221 views

SegWit with BitCore-Lib

How to create a SegWit address and transaction using bitcore-lib?
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1answer
2k views

Can I send balances to Segwit address from non-segwit address?

I have some balance on my first exchange. It use 1~ address. I'm trying to withdraw this balance to my Bitcoin Core's 3~ address.(Which is Segwit address, right? I made this by addwitnessaddress ...
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1answer
414 views

Sent Bitcoin Cash to a Bitcoin segwit address by accident on my Ledger Nano S

Stupid but I sent bitcoin cash to a bitcoin segwit address I own on my Ledger Nano S. They are not shown in either wallet. Did I lose them or is there a way to get them back?