Questions tagged [transaction-input]
Questions about the mechanics of redeeming a UTXO in an input script.
96
questions
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1answer
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Track the expenditure of an output with Bitcoin-qt via the REST API
How do you find the transaction whose input, vin, is a given output, vout? For example, the following is the JSON representation of the block with height 1000; here the mining reward is locked behind ...
0
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1answer
23 views
Invalid input scripts? Why are they included? Is there a correct way to identify them? [duplicate]
Transaction 88025f2bfa2435a7036a865ea0b4748491d21f9b8cfd72788e9d1c9aa8977e7d is valid, but its one and only input has an invalid script. (There are many transactions like this, but this one will ...
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1answer
24 views
What is the weight of a P2TR input?
I'm looking for a detailed explanation of the weight, vsize and serialized length of a P2TR input, in the same vein as How big is the input of a P2PKH transaction?.
0
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1answer
31 views
What is the size and weight of a wrapped segwit single-sig input?
I'm looking for a detailed explanation of the exact weight, vsize and serialized length of a P2SH-P2WPKH (wrapped-segwit single-sig) input, in the same vein as How big is the input of a P2PKH ...
0
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2answers
30 views
Why is the previous output index 4 bytes?
Using this post to define the format of a transaction: Create Output with a bunch of input
Why is the previous utxo index (also called the previous output index) 4 bytes?
The maximum output index ...
0
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1answer
33 views
Can I trace Bitcoin transactions using spent_transaction_hash?
I've spent some time analyzing Bitcoin transaction data and found out that the input column has this value called "spent_transaction_hash". In the dataset, the definition of this value is &...
0
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1answer
32 views
P2SH-Multisig transaction not going through
I have some funds locked in a testnet P2SH address which requires 2-of-3 signatures.
This is the address: 2NEKRqUqoDtsELzpBa5wuWEiJeVbio5cSa2
and the 3 keys:
#1 - ...
1
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1answer
69 views
What exactly is signed in "prev_out"?
What is signed by scriptSig? I use my private key to sign data from the unspent transaction? I sign the "prev_out" object?
I read that the signature in "prev_out" is there to ...
1
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1answer
34 views
What is the exact size and weight of a 2-of-2 P2WSH input?
I'm proofreading an article mentioning the cost reduction of P2TR for Lightning channels in comparison to P2WSH. To that end, I'm looking for the precise weight, vsize and serialized length of a 2-of-...
1
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1answer
130 views
What is "Witness"?
What really is "Witness"? I saw this data in blockchain and can not identify what it really is.
Here is the dump of transaction for example.
TX hash = ...
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1answer
19 views
How is the input and output fields serialised in a transaction?
I'm trying to write a parsing function to find the input and output fields in a serialised transaction.
My problem is that I can find the number of inputs and outputs using the varint byte(s), but not ...
0
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1answer
28 views
Understanding transaction input and ouput
The definition of bitcoin transaction input and output that is there on the web is:
Input = address from which money was sent, Output = address to which money is received
1.
But when I looked at one ...
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1answer
77 views
Confused about input and output spending limitations and consolidation
I am sure the answer to this is trivial to someone who already knows the answer, but not to me.
I recently wanted to spend some received bitcoin for the first time and discovered that the associated ...
0
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1answer
66 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 ...
0
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2answers
38 views
How 1 address can create 14 inputs in output transaction to 1 direct address?
Check this address 1NM3apKLeDGKiFsd6gu1o4nh52efi38iEv
The reason of this extremely high fee because of 14 inputs
But why 1 address generate 14 inputs instead 1?
3
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1answer
422 views
What is the size and weight of a P2WPKH input?
I'm investigating diverging P2WPKH input size calculations on two Bitcoin projects and some blog posts. I'm looking for a detailed explanation of the exact weight, vsize and serialized length of a ...
3
votes
1answer
513 views
How can the segwit witness data be "off-chain"? What does it really mean?
I have several questions regarding the segwit witness data. My current understanding is as follows.
Before segwit, the witness data was part of the input that the user had to provide so that they ...
0
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2answers
115 views
How many addresses can be in input and output of a transaction
I have read through this question and i understand that there can be many sender and receiver addresses within 1 transaction(i'm new to bitcoin transaction, previous i was working with ethereum where ...
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1answer
136 views
How is the UTXOs of each partially-spent TxIn determined?
My current understanding of a transaction is as follows:
a transaction (Tx) can have multiple inputs (which are previous unspent transactions = UTXOs), let's call them the TxIn
a Tx can have multiple ...
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0answers
24 views
Relation between transaction fees and inputs [duplicate]
So this might appear as a duplicate of some of the other questions on this stackexchange, but I feel most of the questions have failed to ask a question that I am really interested in.
I want to ...
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1answer
180 views
Is sharing a signed input safe?
Is it possible to decode the private key from a signed input?
For example:
From this signed input hex...
...
5
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1answer
331 views
What are the sizes of single-sig and 2-of-3 multisig taproot inputs?
There was a Twitter discussion about the sizes of inputs and Taproot came up. What are the input sizes for Taproot inputs?
Please cover both the key path spend (single-sig or default spend) and 2-of-...
0
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1answer
33 views
More Input-Values than necessary. How and why is this possible? No it is not the fees!
The TXID I am talking about: 21179a8560a0a0906f0c3396af338f74528130d46b65b7f0c79c378d343b3177
blockchain.com link: https://www.blockchain.com/btc/tx/...
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1answer
30 views
How to know where number of inputs field ends in a transaction if it is not a fixedsize field?
I know that we parse a transaction in bytes. So there are 2 quesions that I search for the answers of:
1- Can VarInt field -that gives the number of inputs in a transaction- be more than 2 hex digits(...
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1answer
55 views
How do I calculate the sum of transaction inputs?
I am attempting to calculate the mining fee of a transaction, given it's unsigned transaction hex by taking difference between the sum of the inputs and outputs.
I also have access to an array of ...
0
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1answer
40 views
Is it possible to reference an input outpoint more than once in a transaction?
For example, could you have the following transaction:
A --> B
A --> C
Where A is an input txid and index, and B and C are outputs? The reason I'm asking is because I believe with SIGHASH_SINGLE ...
5
votes
2answers
207 views
Can signature be re-used to cash out everything in the address?
I Know for the P2PK locking script it was like this
[pubkey] <OP_CHECKSIG>
and then an unlocking script is provided as simple as this:
[sig]
But if it works like this, others can simply grab ...
0
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1answer
44 views
Do transactions need to be signed
I always thought a transaction can be accepted when all its inputs are correctly provided with their unlock script (which usually contains a signature) ——yes transactions may also be rejected with ...
0
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1answer
37 views
Input of a transaction
If i want to send 0.2 bitcoin to Bob, will my transaction (in the input field) contain the list of all my previous transactions (both the ones in which i received bitcoins and the ones in which i sent ...
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1answer
4k views
Usage of PkScript as a part of Inputs of a Transaction
I've seen transactions with PkScripts as part of Inputs
eg : Example of such a transaction
Could anyone please explain how this PkScript is used ?
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1answer
351 views
How to create a bitcoin transaction without inputs
How can I create a transaction without inputs and it will be broadcasted but of course won't get confirmed? I would like the simplest method to do this
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2answers
49 views
Can addresses used in a single tx be assumed to be from the same wallet?
can addresses of input of a single tx be always considered as belonging to same account?
Above is a sample transaction on bitcoin.
Here, input addresses are
3P2hJg8iRSBExAjd9yQGaazCLPFLeGB3hU (0....
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2answers
2k views
How to get input address and amount from vin using bitcoin core rpc
I am trying to find details of every transaction using bitcoin core rpc. First, I using bitcoin-cli getblock to get the block data, then use bitcoin-cli getrawtransaction to get the transaction ...
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1answer
112 views
What does is mean to have input from multiple wallet addresses?
I've trying to parse some data from the blockchain as provided by blockchain.info
My question is about transactions that have multiple inputs like this one:
https://www.blockchain.com/btc/tx/...
0
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1answer
98 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
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2answers
618 views
How to manually sign a transaction with multiple inputs and multiple outputs?
I'm developing transaction constructor, but i faced several problems. To some of which i found answer in How to sign a transaction with multiple inputs?, for the rest i'll try to explain:
When we ...
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2answers
145 views
What’s the purpose of checking for input overflow?
Everyone knows this famous fix for block 74638 which still exists in other files. But there’s something I can’t understand, why check for inputs overflow since it’s not possible to have enough utxo ...
4
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1answer
654 views
Maximum number of inputs per transaction
In theory, what is the maximum number of inputs per transaction? Is it defined primarily by the maximum number we can store on the 9 byte varint?
How big of a number can be stored on 9 bytes?
Would ...
4
votes
1answer
321 views
Are all UTXOs locked by an address spent in a transaction?
Imagine I have 2 UTXOs locked by my address, each of which allows me to spend 5 bitcoins.
If I subsequently want to send just 2 bitcoins to someone else, will both UTXOs be used as inputs in the ...
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votes
2answers
2k views
How do virtual size, stripped size and raw size compare between legacy address formats and native segwit?
This answer states that SegWit doesn't reduce transaction size. If this is true, why is it cheaper to send a SegWit transaction?
0
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2answers
48 views
Reference an UTXO of a transaction that has not been yet mined
How to reference an UTXO that has not been yet mined? I want to prepare a transaction and, before spreading it, use its UTXO as input for another relative timelocked transaction. Then, spread the ...
1
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1answer
722 views
bitcoinj java library not decoding input addresses for some transactions
I'm trying to "extract" sender's addresses from OP_RETURN Bitcoin transactions, but my code is not working properly.
getWalletAddressOfSender(final Transaction tx)
public static Address ...
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1answer
124 views
How do these inputs/outputs make sense for this transaction?
Using coinbase, I transferred $1 in BCH to my friends BCH address. Now I am studying the transaction on a blockchain explorer as a learning exercise.
See here: https://blockchair.com/bitcoin-cash/...
1
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1answer
701 views
Why are the inputs of Bitcoin transactions signed?
This is my understanding of what a transaction looks like:
inputs:
input0:
txid: <funding tx0 TXID>
outputID: <output ID of UTXO in the funding tx0>
scriptSig: <...
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0answers
42 views
What to pass in Transaction Input using Bitcoinj library
URGENT - Need help with setting up Transaction Input and Output objects
Transaction rawTransaction = new Transaction(params);
txnAmount = Coin.valueOf(50000000);
rawTransaction.addOutput(txnAmount, ...
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2answers
101 views
How many weight units does an input use?
What is the weight unit cost of an input? And can you batch/aggregate the inputs or is it linearly growth when you add more inputs to a tx?
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1answer
61 views
Which values are GetValueIn() and GetValueOut() calculate?
In Transaction.cpp, there is a function CAmount CTransaction::GetValueOut() const.
In Coins.cpp, there is a function CAmount CCoinsViewCache::GetValueIn(const CTransaction& tx) const.
My ...
2
votes
1answer
551 views
what does it mean when a transaction contain multiple inputs?
Just like https://www.blockchain.com/btc/tx/230636ab4f285ca5e9f4c32dbae581c10d491a99493d8733c594af780f1edc5e
what does it mean when a transaction contain multiple inputs?
as i know, an transaction ...
2
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1answer
151 views
How does fee split between senders in a transaction?
I know how fee is calculated in a transaction,
but I don't know how this fee amount split into senders.
For example, consider the following transaction with 0 BTC miner fee:
inputs:
Alice ...
0
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1answer
224 views
Sign Bitcoin transaction with several inputs using bitcoinj. Broadcasting of transaction failed
Good day!
I'm working with low level API to make tx and sign it offline. But after all preparations I try to broadcast it and than i get an error from network:
16: mandatory-script-verify-flag-...
