Questions tagged [script]
This tag should be used for questions regarding Bitcoin transaction scripts or scripting languages used in transactions of altcoins such as Solidity. Scripts are a set of instructions on how to complete a transaction.
420
questions
0
votes
1answer
20 views
Why can't P2PKH's scriptPubKey be shortened to only OP_CHECKSIG?
For P2PKH, the scripPubKey is OP_DUP OP_HASH160 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG. Why can't it check the signature only? Why can't it be shortened to just one opcode — OP_CHECKSIG?
Why ...
0
votes
0answers
36 views
How to construct and redeem a bip199 htlc with python-bitcoinlib
Playing with this script, I'd like to understand how to construct a bip199 htlc and redeem it, however this script fails on the OP_EQUALVERIFY and I can't seem to understand why. I'd like an ...
0
votes
1answer
63 views
Standardness rules related to BIP 16 (P2SH)
I can read in BIP0016 wiki the P2SH Specification
Transactions that redeem these pay-to-script outpoints are only
considered standard if the serialized script - also referred to as the
...
1
vote
1answer
66 views
Where can I find the miniscript policy language specification?
I would like to understand how miniscript works by coding it myself. As I started studying it, I realized that miniscript is more or less a 1-for-1 abstraction of a subset of Script and that the ...
0
votes
1answer
21 views
What are the script size limitations according to consensus rules and are they enforced on TestNet?
I'm trying to figure out the limitations that scripts have regarding their size, limits that would make a script invalid (ignoring standardness). According to this question and also these lines of ...
2
votes
1answer
66 views
Create Custom Script with 2-3
I'm studying P2SH, and I want to create a custom script.
I already created one tx but without OP_CHECKMULITISIG as you can check at this link https://tbtc.bitaps.com/...
0
votes
0answers
32 views
How does HASHSIG work?
I am reading an article about how HASHSIG works, but i don't understand this:
Before the signature is computed, several temporary changes are made to the transaction:
The signature script of the ...
4
votes
1answer
246 views
How is OP_CHECKTEMPLATEVERIFY a scaling solution
I was wondering about OP_CHECKTEMPLATEVERIFY or OP_SECURETHEBAG as it was previously called. As far as I understand it you can commit on how to spend the coins later this way. But it doesn't enable ...
1
vote
1answer
60 views
Bech32 Multisig error: Witness requires empty scriptSig (code 64)
I've been able to do multisig between two addresses from electrum and one from bitcoind.
[root@test bin]# bitcoin-cli -testnet getnewaddress
n3JewuY82cprdRvxHdRNG8C3iTkJBKeLbz
[root@test bin]# ...
1
vote
3answers
59 views
What are some good solutions for analyzing Bitcoin script patterns?
I'm interested in analyzing the Bitcoin blockchain for occurrences of particular scripts and spending patterns. What are some good solutions for this? An ideal solution would let me filter ...
1
vote
2answers
70 views
Can someone explain how an HTLC is redeemed?
I'm looking at Bolt 3 in the Lightning rfc. My question is about how a HTLC is redeemed. Example HTLC script for reference:
# To remote node with revocation key
OP_DUP OP_HASH160 <RIPEMD160(SHA256(...
0
votes
1answer
26 views
How to verify locking and unlocking scripts?
I've selected an arbitrary transaction id and retrieved its associated transaction details using the blockcypher explorer as follows:
from blockcypher import get_transaction_details
...
0
votes
1answer
19 views
How does a constant opcode become negative in Script
I am doing some tutorial and in this chapter we are suppose to reproduce the Script scripting language
I am struggling to understand one of the exercises, here it is:
Create a ScriptSig that can ...
1
vote
1answer
42 views
Is a script spendable if multiple items are left on the stack?
Is a script spendable if the top item left on the stack evaluates to "TRUE", and that is the only item left in the stack?
In other words, is it okay for multiple items to be left on the stack?
For ...
1
vote
2answers
263 views
Non SegWit P2SH bytes structure
I'm working on a bitcoin block explorer in golang, in which I'd like to gather as much informations as possible about transactions.
I am able to extract addresses from every type of output, and mostly ...
1
vote
1answer
51 views
What is the scriptCode in a P2WSH transaction?
Let's say I am spending from a 2-of-2 multisig with this script:
...
1
vote
1answer
57 views
Why is there no decentralized Bitcoin trading API?
Since nobody has answered me the last 30 times when I asked for decentralized Bitcoin trading APIs, I can pretty safely conclude that it just doesn't exist. So that's why I now ask why this is.
Don't ...
1
vote
1answer
89 views
Decoding hex scriptsig in Python
Running decodescript on d1a076722d11ddfd0fadb96d6d960b8b2ad6c6369570cd00df70a801a6be9e44 is returning:
{
"asm": "0 ...
10
votes
3answers
1k views
What does Bitcoin policy language offer the developer that Miniscript doesn't? What is the difference between Bitcoin policy language and Miniscript?
I understand that policy language compiles to Miniscript and Miniscript compiles to Bitcoin Script. This is also a great resource on Miniscript: http://bitcoin.sipa.be/miniscript/ But I know very ...
0
votes
1answer
25 views
How Extracting address Bitcoin to script multi signature
I want to extract the correct address from a script multi-signature.
I have this real script multi-signature from this ScriptSig (tx index 1), so this is a readme script for this address
OP_2
...
1
vote
0answers
35 views
Is possible extract the original script P2MS from the transaction locked with the P2SH address?
This is a stupid question because if the P2SH contains the hash160 (and the hash160 contains the sha256) of the P2MS doesn't possible return to the original hex P2MS.
So, but for verifying the P2SH I ...
1
vote
0answers
36 views
How verify (in C++) input signature?
First small problem: blockchair.com give me only output scripts, not input - is any blockexplorer online with it? I read binary data and this may be hard recreate my sample data and verify.
I test BTC ...
9
votes
1answer
179 views
Can we construct a UTXO which is spendable only via proof of work?
Do the current Bitcoin opcodes and transaction size limit allow constructing a UTXO which is only spendable if a specified amount of work has been performed?
So the spender, would provide a nonce as ...
1
vote
1answer
52 views
Does Bitcoin script support nested IFs (OP_IF or OP_NOTIF inside one another)?
For example can we convert the following code to a script?
if(bool_1)
{
FOO1();
if(!bool_2)
{
FOO2();
}
else
{
BAR1();
if(bool_3)
{
...
3
votes
1answer
66 views
Clarification on execution of complex script with OP_CHECKLOCKTIMEVERIFY
I'm quoting this example of BIP65
BIP 65 has this bitcoin script code
IF
<now + 3 months> CHECKLOCKTIMEVERIFY DROP
<Lenny's pubkey> CHECKSIGVERIFY
1
ELSE
2
ENDIF
<...
0
votes
0answers
89 views
How to use “OP_CHECKSEQUENCEVERIFY” in regtest?
I have created a P2sh includes OP_CHECKSEQUENCEVERIFY and funded the same. I was trying to redeem the coins. But i could not understand the working of OP_CHECKSEQUENCEVERIFY.
Below is the example ...
0
votes
1answer
51 views
How to calculate the Public key P2SH from hexadecimal script?
My study on the scripts goes next.
I'm creating a ScriptPubKey decompiler, now I have a problem with the P2SH,
So how is calculate the key p2sh?
I using this code but I not think is correct
...
1
vote
1answer
86 views
Clarification on the script P2SH, how is executed to Bitcoin core?
This question is a continuation of the my post yesterday.
Today I have a question on P2SH execution so, an example of the script should be this
OP_0 <A Signature> <B Signature> OP_2 <...
0
votes
1answer
68 views
How does this simple script use the OP_CHECKSIG opcode?
I have this Script P2PKH
<A Signature> <A Public Key>
OP_DUP OP_HASH160 <A Public Key Hash> OP_EQUALVERIFY OP_CHECKSIG
The bitcoin.org documentation say this
The entire ...
4
votes
1answer
98 views
How does Elements integrate Simplicity?
Greg Maxwell noted that there are two ways to integrate Simplicity into Bitcoin. One is to make only a few select high-level constructs available (like SHA256, CheckSigHashAll), the other is to expose ...
0
votes
1answer
37 views
Is a multi script possible that requires relative time locks relative to each signature?
I've been wondering about cold storage multi sig security.
Specifically, I was wondering how secure it is with respect to a kidnapper. If a kidnapper took X hostage, and threatened to kill him, X ...
0
votes
0answers
21 views
Who write Bitcoin scripts [duplicate]
I have just discovered Bitcoin scripts system, then now I am wondering which are the people who write bitcoin scripts ? Mainly developers of wallet software ?
1
vote
0answers
21 views
BIP0034 block height using python-bitcoinlib
I'm doing some experiments for finding coinbase height from freshly mined block which is received from ZMQ.
tx_coinbase = CTransaction.deserialize(x('...
0
votes
0answers
55 views
Bitcoin Transaction Generation: Signature Verification Error
I have the following raw transaction (basic P2PKH) which I am trying to send to the Bitcoin Testnet 3:
...
3
votes
1answer
306 views
Is it possible to do a 3-of-5 OR 1 multi-sig for backup purposes?
I'd like to create a multi-sig wallet where I can freely create transactions, but I want to give keys to trusted friends/family + a safety deposit box so that if I hit my head and forget my password, ...
0
votes
1answer
210 views
Bitcoin TX decode failed while sending to a the network(regtest)
I have created a signature manually (referring the signature output formats in bitcoin-cli). But i tried to send the same to the network I am getting
error code: -22
error message:
TX decode ...
0
votes
1answer
39 views
Bitcoin script (pay-to-pubkey-hash)
Example for 'pay-to-pubkey-hash' is quoted in Wiki bitcoin script.
I have a doubt that 14 is for bytes to push. But the data to push is 20 bytes.
Please anyone could explain to me?
Script:
76 --> ...
0
votes
1answer
64 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 ...
0
votes
1answer
115 views
How do I extract the address from a scriptPubKey?
I am creating a block parser and just learned about Scripts in Bitcoin yesterday which is kind of confusing so far. I want to extract the addresses involved in each transaction. Right now, I am able ...
0
votes
0answers
59 views
HTLC in blockchain regtest mode by creating transactions manually
I am trying to create a htlc smart contract manually by writing a script and finding the hex using the btcc compiler. Now node A has to create a transaction using that hex and lock money in that p2sh ...
0
votes
1answer
199 views
Bitcoin raw transaction with manually created redeem script
I am running bitcoin in regtest mode with 2 nodes bitcoinNode1 and bitcoinNode2.I have created a redeem script by writing the opcodes and converted into hex form using btcc.
HP-ProBook-440-G4:~$ btcc ...
0
votes
1answer
49 views
OP_EQUAL not working properly
I went to https://siminchen.github.io/bitcoinIDE/build/editor.html to try some bitcoin scripting and I wrote this script:
<1PUzZ61FSVTn12CafJC85Vy1ts3BoFcXdU> OP_HASH160 <...
0
votes
1answer
33 views
Getting source address of a Tx message from it's signature script
I have a simple bitcoin packet which contains TX message.
in a TX message, one of it's Transaction input hex data was like this:
...
0
votes
1answer
104 views
Detect types of ScriptSig and parse each part
As explained in
https://en.bitcoin.it/wiki/Script
there are many types of scriptPubKey and scriptSig like:
<sig> <pubKey>
<sig> <pubKey> <pubKey>
<sig> <...
1
vote
0answers
53 views
Parse signature and public key from scriptsig in an input transaction of bitcoin protocol [duplicate]
I'm interested in bitcoin protocol and checking validation of a transaction.
in a TX message, we can see one or more than one input transaction and every input transaction has a previous transaction ...
0
votes
0answers
31 views
Extract input addresses from a tx message in bitcoin protocol
Recently, I wrote a c++ code to extract some information from some messages in BITCOIN protocol. for example, I extracted bitcoin value and output address corresponded to it from tx messages of this ...
3
votes
1answer
142 views
Bitcoin script execution unsuccessful
I'm working my way through "Mastering Bitcoin".
The author made a transaction:
0627052b6f28912f2703066a912ea577f2ce4da4caa5a5fbd8a57286c345c2f2
https://www.blockchain.com/btc/tx/...
0
votes
2answers
27 views
Where are the non-scriptPubKey outputs in the chainstate leveldb?
I read
https://bitcoindev.network/understanding-the-data/
and it explain that the leveldb of the chainstate contain transaction with at least one unspent output.
And it has "The scriptPubKey and ...
1
vote
1answer
57 views
How to generate an output address from output scrips which start with 0x00?
A few days ago, I got a BITCOIN traffic which contains some tx message.
some of tx messages contain witness data.
I want to produce all output addresses from transaction output scripts.
I extracted ...
1
vote
1answer
45 views
Bitcoin Blocks Date not coherent? [duplicate]
I was taking data from the BTC Blockchain with a custom script.
I found something really weird.
Block nr. 24668 was created at 2009-10-09 23:02:57
Block nr. 24669 was created at 2009-10-10 00:15:48
...
