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.
479
questions
2
votes
3answers
2k views
Will BTC script be Turing complete in future?
I want to know if BTC script will have loops in it in the future?
3
votes
0answers
28 views
What prior work influenced the design of the Bitcoin instruction set?
The "Script" system used by Bitcoin transactions is commonly described as a Forth-like, stack-based language.
What prior work influenced the design and layout of the Script instruction set?
...
2
votes
1answer
40 views
Why were OP_RESERVED, OP_RESERVED1, and OP_RESERVED2 originally reserved?
Since the earliest public release of Bitcoin, OP_RESERVED, OP_RESERVED1, and OP_RESERVED2 have been defined at 0x50 (80), 0x89 (137), and 0x8a (138), respectively.
Why?
The intended purpose of all the ...
2
votes
0answers
34 views
is there a way to write SCRIPTS that CONDITION OVER THE CURRENT TIME stamp?
I am very new to bitcoin scripts, and need to design some high level bitcoin protocols without enough time to really dive into the details of the language itself.
Is there a way to write a script that ...
0
votes
0answers
23 views
How are reserved operations intended to work?
Bitcoin has reserved words like OP_RESERVED1 that are only valid in an unexecuted if branch. How are those words intended on being used in the future to perform some actual operation?
I understand how ...
1
vote
0answers
89 views
Alt Stack is not working as expected
I have a scenario as follows:
In a company, there is a manager and three employees. The multisig signature will be redeemed by the manager combined with one of the employees.
However, only the ...
3
votes
1answer
59 views
Inner working of OP_IF and OP_ELSE
How does OP_ELSE work exactly? Is there an else if in Script?
According to https://en.bitcoin.it/wiki/Script#Flow_control, the statements after an OP_ELSE are executed in three cases. It says:
If ...
1
vote
1answer
42 views
Bitcoin 2 of 4 Multisig script with one required
Hi I am to write a bitcoin locking script with property that 2 out of 4 signatures should be verified, but among those verified 2 there is a specific signature that should be verified.
I.e only 1 ...
0
votes
1answer
44 views
ElectrumX method blockchain.address.get_balance removed, how to get the script hash of a public addres and get balance?
Reading the ElectrumX documentation, found that the method for getting balance of any public address was: blockchain.address.get_balance, but was removed. Now, I understand that blockchain.scripthash....
0
votes
1answer
28 views
Pay to script hash address transaction not accepted by miners
I have fixed my initial transactions and have been able to send coins to a p2sh address
Now I want to spend those coins but when I try to broadcast my transactions either the website (blockcypher) ...
7
votes
1answer
592 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
61 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
38 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
26 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
35 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
59 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
28 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
59 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
48 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
397 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
110 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
26 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
58 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
152 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
35 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
768 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
99 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
61 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
60 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
63 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
40 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
49 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
38 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
44 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
199 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
56 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
94 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
56 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
41 views
OP_LSHIFT & OP_RSHIFT purpose & functionality
What is the purpose & functionalities of the LSHIFT & RSHIFT Script OP codes ?
3
votes
2answers
59 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
54 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
26 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
67 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 ...
