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.

47 questions with no upvoted or accepted answers
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9
votes
1answer
202 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 ...
8
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1answer
367 views

Did the introduction of VerifyScript cause a backwards incompatible change to consensus?

My question is about the changes to bitcoin done by commit range [a75560d8, 6ff5f718], and their effect on consensus. Out of this range of four commits (all attributed to satoshi) during the dates ...
3
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0answers
485 views

How can I store a redeem script in my wallet?

Imagine that I wrote a redeem script. I calculated the related P2SH address, and sent some bitcoins to that address. In order to spend that bitcoins, I need to remember two things: The private keys ...
3
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0answers
507 views

Creation of P2SH MultiSig Input Script

In the createP2SHMultiSigInputScript() function of BitcoinJ according to this: public static Script createP2SHMultiSigInputScript(@NullableList signatures,Script multisigProgram) Create a program ...
3
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0answers
117 views

Any Innovations in altcoin tech for Bitcoin’s Script language?

Bitcoin’s Script is the forth-like, non-Turing complete language used for transactions. However, in practice, a very limited number of kinds of scripts are allowed, a number of opcodes have been ...
2
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0answers
47 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 ...
2
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1answer
101 views

How to make a homomorphic preimage/payment hash with current lightning network / Bitcoin implementations?

If I remember / understand it correctly by using the mechanisms from the scriptless scripts paper we could easily create homomorphic preimages / paymenthashes. I think this would be a very desirable ...
2
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0answers
30 views

Script and DER in P2PKH

Im trying to figure out the script and DER In P2PKH, the "first part (scriptsig)" push in stack (<sig><pubK>) because is it DER? Instead the "second part (scriptPubKey)" you can map the ...
2
votes
2answers
123 views

How to let surplus go to fundraiser in ANYONECANPAY crowdfunding script?

ANYONECANPAY can be used for crowdfunding, where pledged donations cannot be spent unless funding goal/soft cap is reached. But since output is committed, when soft cap is exceed, all the surplus will ...
2
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0answers
243 views

Locktime requirement not satisfied when locktime set to 1 in p2sh

I've created the following script on testnet: OP_IF 2 <pubkey1> <pubkey2> <pubkey3> 3 OP_CHECKMULTISIG OP_ELSE 1 OP_CHECKSEQUENCEVERIFY OP_DROP <pubkey1&...
2
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0answers
100 views

A common criticism of Segregated Witness is that it is “unnecessarily complex”. Why is it chosen over alternatives?

Segregated Witness (SegWit) is well-along the way to being implemented and deployed as a soft-fork. Facts: SegWit eliminates most forms of transaction malleability. Discounts input scripts in ...
1
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0answers
38 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
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0answers
38 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 ...
1
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0answers
25 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('...
1
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0answers
84 views

Error mandatory-script-verify-flag-failed (Signature is found in scriptCode)

I found a few questions with the specific error, but couldn't find also the appropriate answer. So, here I am. I am working on regtest in a Python library that create transactions and then use JSON-...
1
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0answers
247 views

Coinbase “convert” API?

I use the convert functions at coinbase to take advantage of market changes to increase my position amounts. This weekend I am going to write a php script that tracks the available conversion pairs ...
1
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1answer
92 views

How to split the funds and send X% to fee wallet and the remaining funds to another wallet?

Anybody have any idea about how to do it? User send the bitcoins X% goes to fee wallet remaining funds goes to service wallet I'm trying to use the "sendfrom" but it's not working because he only ...
1
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0answers
55 views

Segwit versioning limitations

Currently my understanding is that if new version of Segwit script is introduced, you are free to create whatever crazy rules you want there as long as they do not go against any valid consensus rules....
1
vote
1answer
82 views

Bitcoin multisig contract - to Lock coins with nTimeLock (BIP65)

I really need help. I am currently Developing a Bitcoin wallet and want to build in a SMS Based send function where the sender does not need to know the receiver publicKey. After the contract get ...
1
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0answers
183 views

Is it possible to create a Dapp on top of Bitcoin?

Is it possible to create a dapp on top of bitcoin similar to how it can be done with ethereum? Can it be just as capable as ethereum?
1
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2answers
144 views

Bitcoin library vs script to develop application

I'm curious about the development of application of Identity management in Blockchain platform, but I'm a bit confused about the technologies to use. In short words, when is more convenient to develop ...
1
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0answers
91 views

get utx scriptPubKey to become an object

I'm using this python script https://github.com/sebicas/bitcoin-sniffer When I see a utx I look at each output and find the scriptPubKey I expected to see something like "scriptPubKey": { "asm": ...
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0answers
440 views

Is there any library to process scriptSig script in transaction, and other scripts?

I'm trying to parse hex representation of scriptSig, in normal transactions there are variable int, r&s, pubkey. But some are really weird, like those ones: ...
1
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0answers
874 views

(Bither) how can i send my bitcoins?

i downloaded Bither as my virtual wallet and added bitcoins in a Hot Wallet Address. But when i try to send bitcoins, i can't. i fill the address, the amount of bitcoins and i type my password but ...
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0answers
507 views

Bitcoin script stack numbers format

On bitcoin wiki site I cant found this specification: *The stacks hold byte vectors. When used as numbers, byte vectors are interpreted as little-endian variable-length integers with the most ...
1
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0answers
454 views

How to get bitcoin address from the pubkey_hash using bitcoin-abe or something else?

I'm using: https://github.com/bitcoin-abe/bitcoin-abe to import the blockchain into a mysql DB it is almost done after 5 days. So I started looking at the data and didn't see any addresses. I know the ...
1
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0answers
167 views

Nonstandard script - TX rejected

I am experimenting in testnet with nonstandard scripts. There was a transaction, created by me, with the following vout script: OP_HASH256 ...
1
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0answers
77 views

How can I add recipient on bitcoind CLI

I know I can add recipients to a transaction on bitcoin-qt and I am looking for a similar way to do it on bitcoind CLI on linux and in bash script. I tried using createrawtransaction and multi-sig ...
0
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0answers
30 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
35 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
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1answer
28 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
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0answers
31 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 ...
0
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1answer
27 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
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0answers
53 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
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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 ...
0
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0answers
136 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
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0answers
69 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: ...
0
votes
1answer
67 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
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0answers
62 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
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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 ...
0
votes
1answer
197 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 ...
0
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0answers
57 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 ...
0
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0answers
37 views

Check an outpoint's scriptPubKey against known scripts

So I would like to check if coin.out.scriptPubKey is part of GetScriptForDestination(mypubkey.GetID()) A simple comparison isn't possible as the scriptPubKey (when I decode it) contains only the ...
0
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2answers
1k views

P2sh redeem script hash

What are the contents of a redeem script hash in a p2sh transaction? From what i read it's similar to the pubkey script but does it only contain the receiver's address?
0
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0answers
478 views

Error: mandatory-script-verify-flag-failed

I have created a raw transaction from myElectrum wallet, but when I try to broadcast it I get this error: mandatory-script-verify-flag-failed Why is this happening? The transaction is below: ...
0
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0answers
2k views

All of a sudden hashrate drops to half the normal

I usually get a nice 200 Mh/s out of my XFX 6770 clocked at 950 MHz / 300 MHz. Sometimes I'll check cgminer and see the hashrate has dropped to around 90Mh/s while temperature of the GPU dropped to a ...
-1
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1answer
161 views

Can someone create a very complex transaction to try to fork the network?

If contracts are built into the code already, what is to stop someone from creating a transaction script that is very cpu intensive to verify, so that some computers accept the block with it and ...