Questions tagged [transaction-input]

Questions about the mechanics of redeeming a UTXO in an input script.

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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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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 ...
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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 ...
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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?
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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 ...
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369 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 ...
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76 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
80 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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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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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... ...
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257 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-...
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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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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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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 ...
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33 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 ...
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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 ...
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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 ...
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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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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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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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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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1k 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
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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/...
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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 <...
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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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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 ...
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520 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 ...
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265 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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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?
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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 ...
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1answer
607 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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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/...
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563 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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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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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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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 ...
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1answer
457 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 ...
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1answer
131 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 ...
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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-...
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2answers
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If I reuse the same address can a previously used transaction be reused?

I was wondering, if I used an address adr0 to spend some coins in a transaction tx0 that give the coins to a different address adr1, and eventually, after some time, I receive some (completely ...
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How get outpoint from txIn

I'm from Ukraine and do not know much English, sorry. I'm not understand where in transaction keep outpoint. Please give me example or manual how get outpoint from input.
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610 views

How get address from ScriptSig: PUSHDATA(N)?

I'm from Ukraine and do not know much English, sorry. I want to parse blockchain, but I have problems. In block 728 will first txs (user-user). But input-script have not public keys. I read this ...
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1answer
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How to read a transaction from a block? Who paid whom?

I'd like to know how to read a 'transaction', so if we take an example of this transaction (which comes from block #520156) it's easy to spot that 'th' paid 'U8' 0.005BTC and '9E' paid 'Y5' 0.013BTC. ...
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multiple input and output addresses in bitcoin transactions

I was checking transactions in blockchain.info. I have some questions about transaction information about input and output addresses. block address: https://blockchain.info/address/...
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how to use multiple time specific address in input scripts with difference balances?

look at to the following transaction (withdraw transaction from binance) https://blockchain.info/tx/404fd22d3d88d129975d03fe2993f0126db8f066b3d8126d6cca676747439515?show_adv=true How in input scripts ...
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Could someone explain how the TX operation here works?

I know this is a BCH address, but it's the best example I could find. The same concept holds for BTC, so understanding what's going on is relevant. https://explorer.bitcoin.com/bch/tx/...
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How are 'excessive' numbers of inputs and outputs handled in bitcoin transactions?

I wrote a bitcoin transaction parser in python and it flips out when transactions have more than 255 inputs or outputs. Some transactions have their number of inputs/outputs represented by a 1 byte ...
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317 views

Unable to decode input address

It seems that some transactions, although having "prev_out" field in their "inputs", does not have "addr" in the "prev_out", i.e. they do not have input address. What is this kind of transactions for? ...
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2k views

what happens to UTXOs when a transaction output script is satisfied?

As per my understanding from the book "Mastering bitcoin", a transaction output contains three things Amount - Bitcoin Value in Satoshis Locking-Script-Size - Locking-Script length in bytes, to ...
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Is there a way to get all addresses from an Wallet?

If I was to search the blockchain for address X, then I see that it has two inputs in a transaction, X and Y. I can safely assume that X and Y are owned by the same person? Now if I look at all of ...