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.
469
questions
7
votes
1answer
571 views
Are these two scripts equivalent?
I wonder whether
OP_DEPTH 0 OP_EQUAL
has the exact same behavior as
OP_DEPTH OP_NOT
which is
1 if no items
0 if any number of items
I'm asking because the first script is used and I'm not sure if ...
0
votes
1answer
51 views
Invalid p2sh transaction accepted by the network
I have try to build a 2 of 2 p2sh transaction from scratch using the book "programming bitcoin" by Jimmy Song, we are not directly guided to make one of those so I had to modify some of the ...
1
vote
0answers
23 views
How do i debug a bitcoin transaction
My main problem is understanding how to convert the response from bitcoin-cli "decoderawtransaction" to the script format i am supposed to put in the debugginng tool. i.e my problem is ...
1
vote
1answer
23 views
Script: How to check if the top item on the main stack is numeric or not?
I'm looking for the clearest way to check whether the top element of the stack is numeric or not.
Thank you in advance
1
vote
0answers
22 views
OP_CHECKMULTISIG Signature must be zero for failed CHECK(MULTI)SIG operation
I am trying to spend a P2SH multi-signature output which I have created with rust-bitcoin as follows:
let builder = Builder::new()
.push_opcode(opcodes::all::OP_PUSHNUM_2)
.push_key(&...
1
vote
1answer
35 views
Is there a difference between OP_PUSHBYTES and OP_PUSHDATA
In some documentation about Script we sometimes have to use OP_PUSHBYTESx or OP_PUSHDATAx to indicate that some number of bytes will be an element to read.
They seem to do the same thing so is there a ...
0
votes
1answer
27 views
What does this Pubkey mean?
I just started learning about Bitcoin, and am sorta familiar with p2pk and p2pkh. I just found this input on a Bitcoin blockchain explorer:
It looks like the Pkscript can be "solved" (I'm ...
2
votes
1answer
39 views
p2pkh vs. p2pk keeping public key private
I just got into learning Bitcoin programming through Jimmy Song's Programming Bitcoin.
Jimmy says that some of p2pkh's advantages over p2pk include:
a smaller ScriptPubKey
keeping one's public key ...
1
vote
1answer
46 views
Bitcoin Native Script Language
I am intrigued by this Bitcoin Script Language, I want to learn how to program Bitcoin with it.
Any idea where I can, find some documentation to read/practice with ?
8
votes
1answer
387 views
Full list of “special cases” during Bitcoin Script execution (p2sh, p2wsh, etc.)?
When executing a Bitcoin Script, there are some "special cases" where the interpreter performs extra verification beyond just executing scriptSig and then scriptPubKey.
For example, if the ...
2
votes
1answer
41 views
In what year and in which Bitcoin improvement proposal Opcodes such as OP_MODE have been disabled?
On Bitcoin wiki several opcodes are listed as "disabled".
My question is simple: which Bitcoin improvement proposal proposed to disable them, and when they have effectively been disabled in ...
1
vote
1answer
81 views
WitnessScript vs. Script Witness
In BIP 174/PSBT, there is a PSBT Input key-value pair called "PSBT_IN_WITNESS_SCRIPT" (0x05) and another called "PSBT_IN_FINAL_SCRIPTWITNESS" (0x08). What is the difference between ...
1
vote
1answer
24 views
Read the “value” being redeemed in a Bitcoin P2SH Script
Is there any way for a Bitcoin P2SH Script to read the amount of Satoshis being redeemed?
2
votes
1answer
41 views
For a redeem script to satisfy the conditions of a script what must it leave on the stack post execution?
I was watching this Andreas Antonopoulos presentation on Advanced Bitcoin Scripting.
It appears from Andreas' examples that for a redeem script to satisfy the conditions of the script it needs to ...
5
votes
1answer
145 views
What is the difference between policy and consensus when it comes to a Bitcoin Core node validating scripts?
What is the difference between policy and consensus when it comes to a Bitcoin Core node validating transaction scripts? Can you give some examples of checks that are considered policy and checks that ...
0
votes
1answer
33 views
Original default bitcoin script
Where can I read the original Bitcoin script for verifying the transactions?
Also, who controls the GitHub profile of bitcoin?
Thanks.
1
vote
0answers
42 views
Bitcoin Script - Beautify
My question is if something exists to do the job in the opposite direction of miniscript.
Miniscript's intention is to help:
...writing (a subset of) Bitcoin Scripts in a structured way, enabling ...
3
votes
3answers
754 views
A Bitcoin locking script to force a certain payment to the receiver?
Is there a way to use Bitcoin script to force payment for the receiver?
I do not mind if it's a non-standard transaction, just curious if Bitcoin script itself allows expression of something like that....
0
votes
1answer
81 views
Bitcoin scriptSig with two transactions to unlock the scriptPubKey
For example, the bitcoin script of a scriptPubKey that consists of OP SUB < 100 > OP EQUAL, and is used to lock an output of a transaction. OP SUB pops the top two elements in the stacks, ...
0
votes
1answer
25 views
and(older(10),pk(A)) malleable if top-level, can it be top-level? EDIT: not malleable, was mistaken
$ ./miniscript
and(older(10),pk(A))
X 110.0000000000 37 and_v(v:pk(A),older(10)) and(older(10),pk(A))
and_v(v:pk(A),older(10))
1 scriptlen=37 maxops=2 type=B safe=yes nonmal=yes dissat=...
0
votes
2answers
55 views
What am I missing about this “guaranteed” money-making scheme that I didn't hear from anyone but just popped up in my head?
Let's suppose that I have already set up an account at Exchange A and Exchange B, loaded each up with a small buffer of BTC (much less than 1 BTC), and am able to make API requests to buy/sell from ...
1
vote
1answer
47 views
Taproot - Eliminating Key Path
I want to struct a transaction output the key-path of which I want to be eliminated, so enforcing only the script path. In order to eliminate key-path, in my opinion, I should set "Internal ...
2
votes
1answer
57 views
Are P2SH transactions with disabled opcodes relayed/mined?
Many OPCODES like OP_AND, OP_CAT, OP_SUBSTR are disabled as described in https://en.bitcoin.it/wiki/Script. Although, with Bitcoin Core 0.10.0 Gavin Andresen proposed "any Script" in P2SH ...
2
votes
1answer
34 views
How is a locking script reliably detected as a P2PKH script?
I've taken this example from a p2pkh guide:
1976a9145fb0e9755a3424efd2ba0587d20b1e98ee29814a88ac
This is broken down into:
19 - byte length of the following unlocking script
76 - OP_DUP: Duplicates ...
3
votes
1answer
48 views
How do I write a script such that my funds are locked in a 2-of-2 multisig that converts into a 1-of-2 multisig after 365 days?
I would like my Bitcoin to have the extra security that a 2-of-2 multisig provides. With a single sig I am worried that if a single key gets hacked I will lose my funds. However, with a 2-of-2 ...
1
vote
0answers
22 views
Why does printing a scriptPubKey have an extra OP_PUSHBYTES_20? [duplicate]
I am building a P2PKH script pubkey in code, and the standard format is:
OP_DUP OP_HASH160 <PUBKEYHASH> OP_EQUALVERIFY OP_CHECKSIG
However, when I print it (I'm using the bitcoin Rust crate) it ...
2
votes
0answers
33 views
Which opcodes where disabled by Satoshi Nakamoto for cve 2010 5137
Lot of opcodes where disabled over the years.
But which opcodes where disabled Satoshi himself and specifically for the any one can spend any coin bug?
1
vote
2answers
44 views
About Bitcoin Core
I have just downloaded the Bitcoin Core from https://bitcoin.org/en/download
I would like to ask the following since I have read the following article:
https://blockgeeks.com/guides/best-bitcoin-...
2
votes
1answer
39 views
What is the relationship between the Minsc language and Policy language?
Quoting from the Minsc website "Minsc is a high-level scripting language...based on the Miniscript Policy language with additional features and syntactic sugar sprinkled on top including ...
2
votes
1answer
185 views
What happens if a P2SH redeem script is lost?
Assume Bob creates a complicated Bitcoin Script and asks Alice to make a payment to a hash of this script. (Using a P2SH transaction)
If Bob loses the script (i.e. the source code of the script), is ...
1
vote
1answer
48 views
Could CHECKSIGADD be used on new ECDSA multisignatures instead of CHECKMULTISIG?
The proposed Taproot soft fork (BIP 342) defines the new opcode OP_CHECKSIGADD to verify Schnorr multisignatures whilst OP_CHECKMULTISIG (and OP_CHECKMULTISIGVERIFY) are disabled for Taproot spends (...
2
votes
2answers
92 views
Given OP_VER was never used, is disabled and not considered useful can its meaning be stripped and it be made OP_SUCCESS?
Given OP_VER (0x62) was never used onchain, is disabled and is not considered useful can its meaning be stripped and it be made OP_SUCCESS for the purposes of introducing a new different opcode in ...
3
votes
1answer
55 views
Should the Policy to Miniscript compiler(s) be considered as deterministic and is this the end goal?
Should the Policy to Miniscript compiler(s) be considered as deterministic and is this the end goal?
This question was asked by Jeremy Rubin on ##miniscript on IRC and has been paraphrased.
For basic ...
0
votes
1answer
40 views
OP_LSHIFT & OP_RSHIFT purpose & functionality
What is the purpose & functionalities of the LSHIFT & RSHIFT Script OP codes ?
3
votes
2answers
58 views
How does the sender know the receiver's public keys in a m-of-n transaction?
Assume that Alice is controlling an address that requires multisig to spend bitcoins. Someone wants to send Alice bitcoins and this sender needs to create a scriptPubKey as part of the output paying ...
0
votes
0answers
31 views
Is who is richer game possible with bitcoin script?
With Bitcoin script, is it possible to construct a timelocked address X in such a way that:
Players A and B (maybe more players) can send bitcoin to this address;
When the timelock expires,the player ...
0
votes
1answer
50 views
Bitcoin script verification fails after certain time period
So I want to write a bitcoin script so that after a certain time period (say for example after 30 mins), the verification fails and transaction is marked invalid even if it gets broadcasted. Time ...
0
votes
1answer
25 views
Can we determine which one of the referenced outputs corresponds to a cashback transaction in BTC transaction scripts?
let me quickly elaborate the question. The structure of a BTC transaction script looks somewhat like the following example
"...
1
vote
1answer
57 views
how to find p2sh/p2wsh in utxo set after wallet recovery
i'm trying to understand how wallets remember a redeem script for p2sh/p2wsh for spending, after recovering from their seed, because the utxo set only has the hash in it, right? there are a nearly ...
0
votes
1answer
36 views
Could it be possible to secure transactions against double-spending with other utxos?
I'm new to Bitcoin Script, and I was wondering if it is possible to use funds from one utxo to "insure" that other utxo will not be double-spent (until the Lightning Network will save us all).
Suppose ...
0
votes
0answers
49 views
creating macd script
this was a script I found for trading with macd. It is taken from trality.com:
@schedule(interval="1h", symbol="BTCUSDT")
def handler(state, data):
macd_ind = data.macd(12,26,9).last
if macd_ind ...
3
votes
1answer
62 views
With Miniscript why is it not possible to invert conditions with something like not()?
This question was asked by Luke Childs (@lukechilds) on Twitter.
In Miniscript would it be possible to invert conditions with something like not()? Could you essentially create a younger() out of not(...
0
votes
1answer
26 views
Understanding assurance contract in bitcoin scripts
I'm having a bit of trouble understanding example 3, the bit coin assurance contract on the bitcoin wiki(https://en.bitcoin.it/wiki/Contract) where senders choose to donate money only if 1000BTC total ...
2
votes
0answers
51 views
How does one prove total turingness of the bitcoin script using the Ackermann Functions?
In this Medium Article (https://medium.com/@craig_10243/bitcoin-a-total-turing-machine-5a6c3c68f5a7#_ftn2), C. Wright states:
"...It is known that all primitive recursive functions are total and ...
0
votes
1answer
53 views
Script_sig for coinbase transaction afbff1130b6fcbdceebbadfc48a842af1f03ee08a79e042b37fc467518b49a0f
I am currently developing a blockchain parser in Python, and it has been crashing in the file blk00006.dat for the coinbase transaction with the hash ...
3
votes
1answer
119 views
How is Simplicity better suited for static analysis compared to script?
Quoted from the whitepaper, one of the design goals of Simplicity is:
Provide formal semantics that facilitate easy reasoning about programs using existing off-the-shelf proof-assistant ...
0
votes
1answer
43 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
69 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
107 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
...
4
votes
1answer
96 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 ...
