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Questions tagged [transaction-verification]

Refers to the process of checking the validity of transactions.

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1answer
61 views

Transaction vaildation

I have understood that miners validate the transactions by checking for double spends and that the transaction was not already confirmed, what I don't understand is how the miners are able to do this ...
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Can corrupted unspent transaction outputs list leading to higher than expected fee be seen as an actual threat?

Let's imagine, an attacker managed to corrupt your local list of unspent transaction outputs (or a blockhain explorer you use) in a way that certain unspent transaction outputs seem to hold less coins ...
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Is a miner running a full node?

Is a miner just running a full node that is connected with the mining hardware? Or is there such thing as a miner node? Does it use additional software for transaction selection? Thanks in advance!
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P2SH signature verification in python

I am trying to understand and verify P2SH script by writing a python code to parse real transaction in blockchain. I have chosen below Transaction randomly. TxID: ...
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Is the UTXO set size important for non-mining full nodes?

Recently, I have seen a lot of development effort going into techniques for different ways of storing, pruning UTXO/TXOs. The main motivation cited is reducing block orphaning, which is mining-...
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1answer
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Satoshi Nakamoto's Transaction Chain Diagram Hash Value

In Satoshi Nakamoto's diagram: The line coming from transaction block 1 and going the the "Hash" label in transaction block 2 appears to represent the hash of the entire transaction block (Owner 1's ...
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1answer
110 views

Merkle Tree computations

Assume I am running a mini-blockchain that is I only have blocks' headers but no transactions. I wish to verify a transaction of a third party. For that I need the transaction's path to the Merkle ...
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2answers
184 views

Merkle root Vs transaction hashes

It is not clear to me, why not we can simply store transaction hashes in a block header instead of storing the Merkle root. I understand that storing transactions' hashes will slightly increase size ...
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2answers
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Why can't Bitcoin transactions be stopped like SWIFT transfers?

As I know, most BTC hacking happens at digital wallet (but in blocks). I believe the hacker use normal BTC transaction to transfer those stolen BTC to other block addresses. Why can't we stop the ...
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1answer
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Why this transaction is valid?

The before transaction is @ https://www.blocktrail.com/tBTC/tx/da58f6688b0727a7f1bf3eec899099bde1f18b9c7099f9d2c79556db238e623d Its output script is "OP_HASH160 ...
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1answer
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Bitcoin core verification keeps reseting

I'm trying to run Bitcoin Core service with full node verification on Ubuntu on testnet and it keeps resetting. The verification increases to 0.3, then resets to 0, for 2 days already. Debug.log ...
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1answer
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What exactly is a bitcoin?

So I understand how blockchains work[1]. I understand how proof-of-work works[2]. And I understand how they work together. I also understand (or at least I think I do :) how transactions work (A block ...
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2answers
711 views

Difference between transaction chain vs blockchain

What are the difference between transaction chain in bitcoin and blockchain used in bitcoin? Is it sufficient to say to each transaction refers to previous transactions in the transaction chain and ...
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1answer
328 views

Does every miner verify blocks that are already in the Blockchain [duplicate]

Once a miner adds a block to the chain, does every other miner have to check that block to make sure that its transactions don't violate any rules? For instance, if a miner added a block with an ...
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why can't i push this transaction?

Why can't I push this transaction using blockchain.info but a transaction just like mine was broadcasted and mined? My transaction: ...
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1answer
1k views

Signature verification in python using compressed public key

I am trying to learn bitcoin blockchain programming. I am trying to verify signature in Transaction with txid: 4269fdc239d027922dcec96f1ae283dbaff10e2d1bd49605661d091e79714956 I am getting ...
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1answer
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What is the computational power required for just verifying maybe two transactions

I want to know the amount of computational power required to verify a just a couple of transactions. No mining included, just verification can it be done with CPU or maybe even phones?
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1answer
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If in order to verify a block your hash just has to be lower than the hash in the block, then why won't 00000000000000000000000000001 work every time?

So if in order to verify a block you just need a hash lower than the block in the hash, then why do you need to do a bunch of calculations rather than just using ...
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2answers
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Can an attacker use a modified Bitcoin node to pass fake transactions into the mempool?

Is it possible for a malicious attacker to download a bitcoin software code, modify that code and use that software for his own benefit? I know that any changes implemented in the bitcoin software ...
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1answer
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Confirming transactions in the Merkle root and SegWit

I'm trying to find out how exactly transactions are confirmed in a block. I understand that to confirm a transaction, you hash it with its associated transaction and then the associated hashes until ...
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393 views

Bitcoin fake transactions

Suppose, A and B are malicious attackers. Both want to send unlimited fake transactions to each other. I know that the transactions won't be accepted in the blockchain. In fact, they don't want their ...
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1answer
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How does Proof of Stake prevents dishonest behaviour compared to PoW?

I know that in Proof of Work (PoW) once a node has found the solution (the nonce) they announce it to the network. Then the rest of the nodes can easily verify the correctness of the block hash and ...
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2answers
629 views

bitcoin transaction expired

I made a BTC transaction on the 17th of January with this ID: 1f15277460d80454fae5c3fae60012e9b1b250e16f778b647c6e8e4acc49f1dc According to coinify (blockchain.info) it expired, so I wasn't able to ...
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Not sure if I accidentally double spent my LTC LITECOIN

LEDGER NANO S - CHROME APP LTC LITECOIN I just sent two transactions (with different amounts) from one address to the same receiver one after another. While sending the second the first was still ...
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How bitcoin transaction fromat design can be explained?

Can someone clarify? Why is there bitcoin address in the transaction, when the bitcoin script already contains the pubkey hash? Why isn't the amount a part of the script? Why does bitcoin script ...
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1answer
626 views

Balance between minimum transaction fee and time using Electrum 3

Yesterday I made my first Bitcoin transaction using Electrum and I was able to configure the fees I was going to pay. As it was a non-urgent transfer I selected the minimum fee Electrum allowed me: "...
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3answers
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Does the version prefix of an address force the type of transactions the address may treat?

A Bitcoin address is created with Base58Check encoding and it requires a version prefix, such as 0x00 for a P2PKH(pay-to-public-key-hash) address, 0x05 for a P2SH(pay-to-script-hash) address. Does ...
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1answer
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Using the Merkle Root to prove the integrity of a block's transactions

I understand that a Merkle Root is the hash of hashes of hashes (etc.) of transaction pairings within a block that ultimately results in one 'Root' hash. Changing anything about any of the original ...
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2answers
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Private Keys / Transaction Verification

Perhaps an ignorant question, my background is in finance not cryptography. After a transaction is made and "signed" with the sender's private key, how can other nodes verify it without knowing the ...
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3answers
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How are bitcoin transactions and the blockchain transferred over the internet?

So I have several specific question connected to this topic and I'm aware of the conceptual answers and I'm only interested in the technical details (with programming terms and concepts as I'm a ...
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0answers
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bitcoin transaction spent but not received

I hope you are well. I had a weird transaction which was sent a few days ago, it now says spent, and received but has not changed my wallet balance, sent it from one exchange to another. When it is ...
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1answer
631 views

10 days, still no confirmation. Will this ever get confirmed [duplicate]

Hello StackExchange users, I've been waiting for 10 days now for my transaction to confirm, and it still hasn't. Can anyone please tell me if there is something I can do, or what the status of my ...
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1answer
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Does the miner first validate transaction before doing POW or he does not validate at all ? [duplicate]

Does the miner validate the transaction before putting it on the block for proof of work? my understanding is if the miner does not validate the transaction and published the block and the block gets ...
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How do I lookup the details of a transaction, given the transaction ID?

I transferred BTC from GDAX to Binance. I have the transaction ID. How do I find out the status of the transfer. GDAX reports transfer complete. Thanks.
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How Blockchain transaction verification takes place?

How does each transaction verifying node come to know if the sender has enough amount in its wallet to transfer to the receiver or not? How are Blockchain transactions validated?
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1answer
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What would happen if every miner adds a transaction to his block that did not occur?

Let's say every single miner in the world added the same transaction to their block via trickery. The transaction was never initiated by the wallet holder. Would a block from these miners be added to ...
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2answers
626 views

How does the computational cost of verifying transactions scale with the number of total transactions?

As more transactions are added to the block chain, does each individual transaction (ie. I send a bitcoin to a friend) get more expensive (in terms of FLOPS) to verify and commit to the chain? If each ...
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2answers
195 views

How is a miner prevented from adding transactions without signatures to their block?

Consider I'm a miner. I mine on my own, I don't mine in pools. I have power enough to find the hash, lets say, once per 2 years. When I find the hash within those 2 years I send the block back to the ...
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3answers
448 views

Why can't someone create a valid digital signature without knowing your private key?

I understand from the following two posts that private keys are not displayed by the sender when getting their transaction validated by the bitcoin miners: What happens to Private Key on Payment How ...
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1answer
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Verification of Transfer

Ok I have made bit Cash paper wallet ... Now I am going to transfer to it from my Trezor.. my question is how do I verify that what I transfered is on the paper wallet? Thanks Linda
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How it is possible to validate existing Pay to Public Key Hash transaction without public key?

These are my understanding or assumptions. Sign a document requires secret key and message only as below SignDocument(secret key, message) => signature And verification of signature requires ...
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1answer
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(Detailed) journey of a transaction

I want to understand better the paths taken by a bitcoin transaction. Whereas familiar with the general setup (submitting a payment, validation using your private key, everyone in the network can ...
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1answer
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Neutrality in Bitcoin Verification

Is there any build-in mechanism to retain neutrality in the verification process for bitcoin miners? I am thinking of a situation where I offer miners a fee not to include transactions from a certain ...
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3answers
1k views

Exchange Transaction versus Blockchain Verification

I am wondering about a question related to this post. According to bitcoinity, the number of bitcoin-trades at major exchanges per minute is roughly 400. However, as also pointed out by @eponymous in ...
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1answer
441 views

What if is there is no solution to a block?

Please let me know if I understand something wrong. Let's say I want to create a new block and verify previous transactions. To do this, I need to: Choose which transactions I want to include in my ...
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1answer
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i sent bitcoin from my coinbase account to my bittrex account but i used the Bitcoin cash address on accident

I have sent bitcoin from my coinbase account to my bittrex account but i have used my bitcoin cash address from bittrex on accident, Where did my money go and is there a way i could access it thru ...
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2answers
2k views

Transaction verification vs block mining

I cannot clearly understand if the transaction verification is done over a single or double phase. This is my understanding. Once a transaction is completely assembled, its inputs and outputs ...
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1answer
897 views

Error validating transaction using BLOCKCYPHER

I recently followed the steps on the answer by StephenM347 to the following problem: Cannot access my bitcoins because my wallet is still synchronising. What can I do to spend them immediately? ...
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1answer
144 views

API for getting the Hash-of-thing-to-sign

Does anyone have, or have access to a simple API that can calculate the hashofthingtosign for old transactions along the blockchain? I'm just looking for something simple to see what the "...
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1answer
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PlexCard Visa : Would it be legal all around the world?

Recently, Plexcoin is to come up in the market with very promising future. Directly, citing from their website, the features include In comparison to Bitcoin (45 minutes), the transactions (deposit, ...