Questions tagged [transaction-input]

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

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1
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1answer
170 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... ...
2
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1answer
49 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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1answer
22 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
20 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
22 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 ...
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1answer
24 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
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2answers
193 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 ...
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1answer
34 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 ...
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1answer
31 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
399 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
206 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
37 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
509 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
45 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/...
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1answer
50 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 <...
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1answer
145 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
112 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 ...
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1answer
272 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
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1answer
185 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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2answers
669 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?
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2answers
44 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 ...
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1answer
391 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
71 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/...
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1answer
318 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
34 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
69 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
54 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 ...
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1answer
284 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
84 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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1answer
153 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-...
2
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2answers
198 views

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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1answer
105 views

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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2answers
567 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
76 views

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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1answer
6k views

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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2answers
66 views

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 ...
0
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1answer
45 views

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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1answer
66 views

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 ...
0
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1answer
293 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? ...
0
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1answer
899 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 ...
0
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1answer
133 views

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 ...
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1answer
129 views

Does input and output size vary by address type?

For instance, we have two outputs, output X sends to a P2SH address, and output Z sends to a P2PKH address. Would output X have a different transaction size than output Z? What about the size of the ...
3
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2answers
205 views

Why do we refer to previous transactions in each transaction?

Isn't it enough to just have the Input Address, Output Address, Amount and Signature for each transaction?
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1answer
374 views

How to calculate scriptPubkey?

Given an address (i.e. 1BnPVV5Tt25cxbDg6DqoxJunjSL8reCGz6), how can I calculate its scriptPubKey in order to build a transaction?
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2answers
518 views

Can you specify more than one output index in a transaction's input?

It looks to me like each input to a bitcoin transaction has an index that specifies only one output from the input its spending. Is there a way to specify more than one output index, or do you have to ...
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2answers
106 views

Does using different addresses affect subsequent transaction size, given the same number of inputs?

I'm quite confused about the input count that affect the transaction size, example: x1 = my receive btc address x2 = my another receive btc address x3 = my another receive btc address Scenario A ...
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1answer
483 views

Can a low fee unconfirmed transaction prevent confirmations of following transactions?

To be more precise, consider the following situation: Address A gets an input of 4 BTC. You try to make a transaction from A to B with 1 BTC and a very low fee, which means its unconfirmed for a long ...
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2answers
407 views

Do i need to sign each input in a raw transaction?

I've been reading up about raw transactions on bitcoin.org and there are two examples Simple and Complex. What I can't tell from the information provided is if it necessary to sign each of the inputs ...
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2answers
921 views

Sign transaction with multiple inputs using bitcoinj/peercoinj libraries

Good day for everyone! I have some troubles with adding signed Input to the transaction. Currently, I'm working with altCoin (fork peercoin) currency. I'm trying build the transaction in the ...
7
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2answers
2k views

How do transaction costs compare between Bech32 addresses and legacy Bitcoin addresses?

Now that Electrum 3 supports Bech32 addresses for segwit, when sending coins to a legacy address are fees higher or cheaper?