Questions tagged [transaction-verification]
The process in which every Bitcoin node checks every part of every Bitcoin transaction worldwide for conformance to standard rules and uses the complete history of all previous Bitcoin transactions to check that money being spent in a transaction has not previously been spent in any earlier transaction since the beginning of Bitcoin.
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When the validity of scriptPubKey is checked?
I have a couple of questions related to validation of script in transaction output (scriptPubKey).
I apologize for a little more text, but I tried to explain in detail what I don't understand.
Since ...
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Taking the existing INPUT and changing the OUTPUT to steal bitcoins. Is this a possible bitcoin theft scenario and how to prevent it?
I'm relatively new to Bitcoin and I'm wondering how Bitcoin defends against the following scenario and if it's even possible.
Before I start with the scenario, just two notes:
1. There is a lot of ...
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Do Bitcore APIs have daily limits?
I can't find online if the bitcore API (https://github.com/bitpay/bitcore/blob/master/packages/bitcore-node/docs/api-documentation.md) has daily limits for making requests, or if there is a need to ...
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Unconfirmed transaction Bitcoin Core 22.0
I use Bitcoin Core 22.0. I sent a transaction.
By mistake I chose a low feerate, and now the transaction is stuck in the mempool, and who knows if anyone will notice it. In previous versions of ...
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Where is a transaction stored before getting added to the mempool?
A transaction is stored in the mempool before it is confirmed. However, the Bitcoin node can't verify incoming transactions with 'light speed' to add them to a mempool—it obviously needs some time. So,...
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Does running a standard Bitcoin full node mean your node verifies transactions of other members?
If I install Bitcoin Core and run it as a Full Node, will Bitcoin Core automatically verify transactions from other users? So, just by installing a Bitcoin Core Full Node, could I possibly process ...
user140388
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How come an `OP_3` P2SH redeem script is spendable?
I completed a round trip transaction with the redeem script hash: 31vFvEkyAb2iusbPip36H9rVt6pxExuaVR, whose redeem script is OP_3 (0x53) (yes I know not secure).
I can understand OP_1 redeem script ...
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Why does the Bitcoin network encrypt the transaction data? [duplicate]
The whole process of encryption sounds useless to me. Miners/validators and full nodes need to verify each transaction. They need two pieces of information:
The original transaction data
The ...
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Need a detailed step-by-step P2PK signature validation example
In the process of validating transactions by hand with a new library in elixir. I am starting with f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16, which is one of the first P2PK ...
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What Lightning Network transaction information is usable to provide a verifiable public index of received payments?
I have in mind a protocol architecture that includes value transfer, where BTC is the unit of account.
To make the protocol scalable I could specify use of the Lightning Network protocol.
In this case,...
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When was the 10,000 B limit for scripts introduced?
The file src/script/script.h defines a MAX_SCRIPT_SIZE of 10,000 B. Among other instances, the MAX_SCRIPT_SIZE is used in the IsUnspendable() check, which allows us to avoid adding outputs with ...
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What rules does a node execute to determine if a transaction is valid and propagate it to other nodes?
How does a node decide whether a transaction is valid and whether to propagate it to other nodes?
Could you please mention some of the basic rules that nodes follow for such a purpose?
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Why does IsCoinBase() check if there is exactly one input?
In the Bitcoin Core source code there is a function to check if a given transaction is a coinbase or not:
bool IsCoinBase() const
{
return (vin.size() == 1 && vin[0].prevout....
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When The Unlocking Script Is Created, Who Verifies The Script?
I am familiar with the many ways an unlocking script is created. But in this scenario, lets use P2PKH. When we generate the unlocking script (excuse the simplicity):
<dup> <hash160> <...
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The true reason bitcoin needs merkle proof for SPV wallet?
I know exactly what merkle tree is, and I know it is used to verify a transaction is in a block with just a hundred of bytes flowing through my network cable (btw do I really lack that megabytes ...
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Is there a way to know how many of currently unconfirmed transactions in the MemPool is currently being attempted by other miners?
Assume there there 100 unconfirmed transactions currently in the MemPool. And the size of a block is such that it's roughly made up of 10 transactions.
Now when a miner completes the Proof of Work &...
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What algorithm do miners use to validate individual transactions in a broadcasted solution before accepting it to their blockchain?
If proof of work is a consensus algorithm that guards against malicious nodes from adding faulty blocks, what actually happens when a miner successfully confirms a fraudulent block (i.e. a block that ...
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Curiosity, Minimal transaction accepted as valid? (zero input/ zero output)
$ bitcoin-cli decoderawtransaction 00000000000000000000
{
"txid": "f702453dd03b0f055e5437d76128141803984fb10acb85fc3b2184fae2f3fa78",
"hash": "...
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Does every single node in the blockchain validate the transactions in the mempool?
I have read several responses to various questions SE. Some responses partially respond to the question so I was hoping to get your help to bridge my gaps in understanding.
Does every single node on ...
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What databases is used to see if a transaction is valid?
When you check a transaction before adding it to a block what data source is used as a source to make sure all the coinbase transactions are valid.
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Using EQUALVERIFY with different public keys, but generated from the same seed
I am building certain system that involves Bitcoin and therefore I need to understand well how it works under the hood.
In order to receive funds, for every new transaction new public key and its hash ...
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How and when do nodes stop broadcasting a transaction?
Suppose a node begins broadcasting a signed transaction.
Question 1. At what stage is the signature verified? In §5 of the whitepaper, verification only appears during block acceptance after mining. ...
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Why can't I modify someone else's transactions, if I have their signature data?
As I know, signature system is adding signature to end of transaction. And doesn’t hash transaction, so others can know my signature.
If I can send a message directly to the node, can I use other’s ...
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How many times and where exactly is ECDSA used in Bitcoin?
I'm currently a little confused about where exactly ECDSA is used in the transaction process... some resources seem to say it's used once, whereas others seem to say it's used three times.
Which is ...
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Trying to understand a nonstandard transaction in bitcoin tests
I am trying to implement a bitcoin script interpreter and today I stumbled upon a nonstandard transaction in tx_valid.json which gave me a lot of headaches. The transaction in question has the ...
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Why is OP_XOR disabled? Are there any forks on which it has been enabled? [duplicate]
Why is OP_XOR disabled?
Are there any forks on which it has been enabled?
Are there any plans to enable it?
Perhaps this is the answer, still perhaps there is another reason for the bitwise logic ...
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Can the order of transactions not strictly follow the chronological order?
Suppose I have 1 bitcoin, I give Alice 0.2 bitcoin first, then Bob 0.2 bitcoin immediately, both transactions are legal
can miners reverse the chronological order when packing block ?
If (1) is true, ...
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How does validating a transaction get more and more hard?
As far as I know, to prevent double-spend attack and to confirm that a specific transaction is valid, miners have to go through all blocks in the blockchain and check the sender's history of ...
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Bitcoin transaction script debugging strategy - how to debug 'invalid script' errors
I've been playing around with DLC transactions but I can't seem to create a valid CET transaction to conclude simple all or nothing bets. Further details below on my specific case, though this ...
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Are the block headers kept in memory?
Bitcoin Core keeps block data as files in the file system and blocks indexes in a LevelDB database to make the search process of transactions and blocks faster. But Bitcoin Core also stores block ...
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Watch incoming transaction with node.js
I would like to watch a set of Bitcoin addresses and be able to execute some logic as they receive a payment.
According to this answer it can be done using blockchain.info:
const Socket = require('...
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Block 170 transaction validation in the old days
I'm trying to understand how to validate the first non-coinbase transaction, that is transaction 1 of block 169, as it was validated in the old days.
This transaction has one input, which decoded ...
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How much time do miners spend validation?
Before mining, miners have to validate previous block and transactions which exist in mempool. Then, they pick up some validated transactions from pool and start mining on top of validated block using ...
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Why there are signature and public key pair on blocks when transaction verifying is over
I'm student studying about bitcoin and blockchain. I want to know why all blocks have signature and key pair after the transaction is over.
Why I ask this, I'm studying post quantum cryptography (PQC) ...
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What's the difference between an 'address' and an 'addressHash' in a transaction on a bitcoind node?
I'm listening to a ZMQ socket; it's sending out messages every time my node receives a transaction. The message is the binary value of the transaction itself. When I decode the binary (using a tool in ...
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Bitcoin transaction validation is not based on a static pattern, but instead is achieved through the execution of a scripting language
What is static pattern and why it is not used in transaction validation and why execution pattern is used through the scripting language i am a bit confused need a clear explanation.
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My transaction is in review for over 24hrs on blockchain, I want to cancel it
Please I want to cancel my in review transaction on blockchain. How will I go about it. Please help me,I need answers as soon as possible.
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Transaction not received? [duplicate]
Can someone help me? i did my first transaction
From ID : 3FxvvRt1wpTHzN8xYVBXMsrGB6aTSrndBQ
To ID: 3LSGTkzC62tgTALSGHF7Ztw1dPF5Vyg38B
The adresses are right, not fault to find?
Thanks
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Bitcoin wallet key pair change and transaction validation
For anonymity reasons key pair of a wallet can change. Then how does miner validate if a sender has enough bitcoins?
After key pair change blockchain history contains only old public key as a wallet ...
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What does verifying a fake transaction mean?
Dear China: please ban bitcoin mining.
Four large Chinese mining pools control almost 60% of bitcoin supply and could in theory collude to verify a fake transaction: Goldman
https://twitter.com/...
user103136
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Error validating a transaction with blockcypher
I've created a testnet transaction using blockcypher API (https://api.blockcypher.com/v1/btc/test3/txs/new) and then signed the transaction using the signer (go lang). And then sent signed transaction ...
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Function combinerawtransaction is not working
I have multiple partially signed transactions that I want to combine into one transaction. All those transactions were signed using the same key so it should be possible to combine all those partial ...
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How are the unlocking script + locking script executed?
I just wanted to verify the input of transaction 7de75. The related output is index 10 of transaction 00f64.
The locking script defined in 76a91 (index 10) is:
OP_DUP
OP_HASH160
...
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Inner working of OP_IF and OP_ELSE
How does OP_ELSE work exactly? Is there an else if in Script?
According to https://en.bitcoin.it/wiki/Script#Flow_control, the statements after an OP_ELSE are executed in three cases. It says:
If ...
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Why does the value range of outputs need to be restricted?
In the 'tx messages' section for protocol rules we have
Each output value, as well as the total, must be in legal money range
For each input, if the referenced output does not exist (e.g. never ...
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Generating zero-amount transactions in regtest mode?
I'm setting up a larger test network of regtest nodes in which all of them should be easily capable of creating blocks and sending transactions.
To this end, I'm looking for a simple way for the nodes ...
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How does the blockchain resolve arbitration issues?
I understand that a bitcoin wallet is nothing but a transaction record performed on the block chain.
How are transaction details updated in the decentralised block chain?
In a centralised system a ...
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Final Balance -Balance showing different then Coinspot BTC wallet
Bit of a beginner question
I have been using crypto wallets for a few months and have basically learned through trial and error.
The question is my BTC wallet on Coinspot has a $0 and 0.0 BTC balance.
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What exactly does the "For each input, if the referenced output exists in any other tx in the pool, reject this transaction." tx validation rule mean?
I am currently following the "tx" messages section of en.bitcoin.it/wiki website, and I need some clarity about the following rule regarding the validity of a transaction:
For each input, ...
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How are transactions verified with only the Bitcoin address, not the public key?
I understand how asymmetric cryptosystems and digital signatures work:
You generate a (private key, public key) pair. You never share the private key, you make the public key ... well, public.
You ...
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