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.

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Destination address(es) when redeeming an HTLC

Starting from this text at https://en.bitcoin.it/wiki/Script: "The script for a typical Bitcoin transfer to destination Bitcoin address D simply encumbers future spending of the bitcoins with two ...
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4answers
259 views

OP_CHECKDATASIGVERIFY not working

I'm trying to generate a signature and pass it through OP_CHECKDATASIGVERIFY as part of a P2SH address on a regtest network. This results in the following: Public Key: ...
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1answer
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OP_CHECKSIG NULLFAIL with btcdeb

I'm using btcdeb to understand script. I pick a old random P2PKH transaction form mainnet, and paste unlocking script e locking script inside. I know that this script is ok, because I can check on ...
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1answer
46 views

Original bitcoin core has one script.cpp.where is interepreter for it?I want to write hello world compiler to understand this.?

How to understand script.cpp and its interpreter.I understand register and postfix operation. I want to understand how script is parsed into machine code.Can i write hello world such as only pushing ...
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1answer
101 views

nSequence win OP_CSV in child tx must be equal to nSeq parent tx?

When I create OP_CSV transaction I need to set nSequence to the same number (in blocks) e.g. 3 OP_CHECKSEQUENCEVERIFY nSequence = 3 But when I trying to spend this tx (after 3 blocks confirmation)...
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1answer
208 views

Transaction still unspendable with CLTV

Previously I generated tx with CHECKLOCKTIMEVERIFY Here is the transaction https://tchain.btc.com/bb1415c166fd9f767c06d34d539f4b110ef4445f74a76c5ffad1ded33032e872 It lock funds before block 1442909. ...
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1answer
41 views

Is it possible to write a script, which can allow spend only own inputs except all of them?

Let's imagine: We have just one BTC address. Users send some coins to this shared address. And can spend only own inputs. P.S. If someone can provide some example script for this I'll be very ...
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1answer
50 views

When do scripts executed?

Can anyone explain when does a script executed exactly? There are several information about "how scripts are executed" but no information about "when".
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1answer
226 views

Differences/similarities of “Bitcoin script” and “Ethereum smart contract”?

Can we compare Bitcoin script and Ethereum smart contract ? And if yes, What are differences/similarities of Bitcoin script and Ethereum smart contract in sense of functionality, architecture and ...
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1answer
191 views

Possible to check who signed the transaction in a multi-sig transaction case?

Say you have a multi-sig tx that originated from a 2-of-3 P2SH address. Is it possible to say who signed the transaction? i.e. you can get access to the redeem script once the tx is broadcasted, and ...
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1answer
267 views

Parse scripts to extract address [duplicate]

I want to parse a script with c++ to gain an output address from it. can anybody introduce a suitable library or a sample code which extract addresses from scripts ?
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1answer
166 views

Extract output address from raw script in bitcoin protocol

I'm working on bitcoin protocol and exactly i want to extract raw script from output script to gain address from tx messages. for common scripts, like scripts start with 0x76(means OP_DUP), we can ...
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1answer
96 views

How can OP_CHECKLOCKTIMEVERIFY be used to create outputs provably spendable by anyone?

While reading BIP 65 it says that op_checklocktimeverify can be used to create provably spendable outputs by anyone. How is this possible?
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1answer
175 views

What does a coinbase output script look like?

What does a coinbase output script look like and how would it be used to fund a transaction?
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2answers
187 views

How is a transaction formated/signed?

Every transaction takes unspent outputs as inputs and creates new outputs. The creator of the transaction uses his private key to sign the transaction and nodes validate that transaction by using the ...
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1answer
105 views

During Bitcoin Script execution, what is the significance of the signature verification in the stack?

During execution of the script i.e. ScriptSig + ScriptPub , the last step is the verification of the Signature against the public key provided by the recipient. How does this work and what is the ...
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1answer
66 views

hash locked multisig, can one cosigner sign without the pre-image?

Consider Alice and Bob created the following native segwit script: hash SHA256 defined as H | Alice PubKey | Bob Pubkey Only Bob has the pre-image (plain text that hashes [sha256] to H). Can Alice ...
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1answer
234 views

funding and spending a “no-multisig/no segwit” P2SH tx

I got inspired by this thread: Single signature P2SH redeem script Assume I want to "hide" my address as long as can be. So I want a P2SH tx, which only shows a redeemscript (hash of my pubkey) on ...
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1answer
382 views

How secure is bitcoin private key generated by this script? [closed]

I found this python script on github. It generates a pair of bitcoin private key and address. I know the private key may be vulnerable if it is created insecurely. I don't have much knowledge ...
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1answer
2k views

Signature verification in python

When trying to implement OP_CHECKSIG, I am unable to figure out how to do the actual signature verification in python (python3) I obtained the signature, public key, and hashed message digest of a ...
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1answer
476 views

Why is using a simple SHA1 in a scriptPubKey to emulate a “password” a security problem?

I'm independently working my way through an excellent online course on bitcoin, made available from Stanford. (https://crypto.stanford.edu/cs251). One of the problems in the homework challenges the ...
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1answer
195 views

How many IF/ELSE/ENDIF can be used in a script?

Besides the 520 bytes consensus rule limit, is there a limit on how many of each OP_IF, OP_ELSE and OP_ENDIF can be used in a single script? For example, a company that has 3 people in its purchase ...
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1answer
49 views

Is there a limit in bits for the data hashed in hash-locked script?

What is the limit in bits for the plain-text data of a secret (the data that it is actually hashed and used in a script) in a hash locked contract?
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1answer
137 views

Untypical input script

There are many untypical Input script data in blockchain. What does it mean? For example, transaction: 4A253F17E5F4B24B41F72A6AE46DD1BCB25F7F33769C2AA5D50C6A6A7CF9F76E (link) has it's input script: ...
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1answer
61 views

Confused about this particular Multisig transaction with a (maybe) invalid scripts, but spent output

I am confused about this particular transaction: { "txid": "c49b3c445c89d832289de0fd3b0281efdcce418333dacd028061e8de9f0a6f10", "hash": "...
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1answer
241 views

How does the scriptPubKey for this test vector work?

The scriptPubKey for cbebc4da731e8995fe97f6fadcd731b36ad40e5ecb31e38e904f6e5982fa09f7 is: ...
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1answer
45 views

Can a transaction be conditioned on signing another transaction?

I was thinking around http://lightning.network/ . My problem is Alice sending coins to Bob via Eve: A -- tx1 -> E -- tx2 -> B Is there a way to condition tx1 on Eve signing tx2?
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1answer
288 views

Does OP_EQUALVERIFY have a return value?

The Bitcoin wiki has a page that summarizes OP_EQUAL and OP_EQUALVERIFY: OP_EQUAL Opcode (Hex): 135 (0x87) Input: x1 x2 Output: True / false Summary: Returns 1 if the inputs are exactly equal, 0 ...
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1answer
50 views

What are some valid ways to obfuscate the scriptPubKey?

Is it possible to hide the balance of an address from standard clients who may be watching blockchain? I'm thinking about using script to modify the the key that is to be verified, but am having ...
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1answer
82 views

Tracking a specific Bitcoin to make it represent something else, which could then be traded without trust [duplicate]

Imagine if one could follow the movements of a specific Bitcoin (or fraction thereof) in the block chain. Then that would mean that I could make that specific Bitcoin represent something else, which ...
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1answer
72 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, ...
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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 ...
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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 ...
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1answer
34 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 ...
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0answers
39 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 ...
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1answer
40 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 ...
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0answers
67 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 ...
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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 ...
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1answer
76 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 ...
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1answer
22 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 ...
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0answers
176 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 ...
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0answers
91 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: ...
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1answer
84 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
468 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 ...
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0answers
65 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 ...
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0answers
32 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 ...
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1answer
277 views

Script to import multiple priv keys in Electrum

DuckDuckGo turns up nothing of interest. How to import multiple priv keys in Electrum from a file using Electrum console or shell script, for all derivable valid BTC addresses? (1,3,bc1) Eventually I ...
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1answer
228 views

ScriptCode field in P2SH-P2WPKH BIP-143 Test Vector

I'm trying to understand the meaning of scriptCode in the context of spending a P2SH(P2WPKH) UTXO. I've already read the following answer to a similar question, but it does not fully address my ...
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2answers
227 views

Can someone help me understand what these scripts mean?

Could someone explain what the commands i have in bold do? if possible. Thank you. Transaction URL www.blockchain.com/btc/tx Input Scripts- ScriptSig: PUSHDATA(71)[...
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0answers
61 views

Uniquely identifying a UTXO

I see two ways: Txid + index Txid + script hash Pros of the txid + index: Simple and short Cons of txid + index: It relies on array iteration being deterministic and all third party services ...

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