Questions tagged [verification]

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25
votes
1answer
14k views

When a block is “discovered” how is the nonce determined?

I know that a block is based on a random number called a nonce, but if that number is random and unknown to the miner, how is that number actually verified as the correct nonce and not some arbitrary ...
12
votes
2answers
5k views

MtGox - trusted vs verified

What is the difference between a "trusted", "verified" and other accounts at MtGox? In order to get "verified", one needs to provide them with photo ID and utility bill, but how does one get "trusted"?...
9
votes
2answers
2k views

What exactly is checked at various -checklevel's?

The standard bitcoin-qt/bitcoind client has an option -checklevel which purports to perform various checks on the block data stored on disk. Is there current documentation (other than the source) ...
8
votes
2answers
3k views

Different error messages under “Mandatory script verify flag failed.”

I've been playing with raw transactions and signed transaction and I've noticed that the error "Mandatory script verify flag failed" comes in two variations. script failed on OP_EQUALVERIFY OP Script ...
7
votes
2answers
668 views

Is it possible for someone to verify that a wallet is theirs wallet, without providing their private key?

I need to know with 100% certainty that someone can tell me "this is my wallet" and prove it to me. I could of course simply get their private key/brainwallet phrase, is there any other way to do it?
7
votes
2answers
481 views

How should one try verifying to whom a given Bitcoin address belongs?

Lets say, I'd have a website that shows a large number of Bitcoin public addresses, and wanted to give option for anyone that owns a given address to verify it automatically. Assuming that one ...
7
votes
2answers
635 views

What alternatives are there to hardcoding checkpoints into the Bitcoin client?

Checkpoints seem like a crucial part of the security & validation apparatus in Bitcoin. Is there a written policy in place, among the developers defining the maximum interval between checkpoints? ...
7
votes
3answers
2k views

Is there a way to prove ownership of a transaction?

Is it possible to prove that you are the sender in a transaction? Prove this to 3rd-parties, not only the receiver.
7
votes
2answers
600 views

What is “Verifying last 288 blocks at level 3”?

Upon every start of bitcoind, I see the following in de debug log: Verifying last 288 blocks at level 3 come up. At this point, no new blocks have been downloaded and the block chain was 100% up to ...
6
votes
4answers
4k views

Can each Bitcoin and Satoshi be uniquely identified?

I'm pretty sure I've read somewhere that BitCoins have an "address", so they can be uniquely identified. What I want to know is: Does each Satoshi have it's own unique identity? How is the identity ...
6
votes
1answer
712 views

Transaction verification by miner VS full node with & without SegWit

I'm trying to fill a few gaps in my understanding of transaction verification and would appreciate any insight. Without SegWit Miners broadcast new blocks which contain the signature(s) with every ...
6
votes
1answer
6k views

What is the block verification procedure, and will it ever become too expensive?

I'm trying to get a grasp on which items the network is responsible for validating / enforcing. If I understand correctly, when a new block is received, the recipient needs to verify the following: ...
5
votes
2answers
7k views

How do signatures work?

Just curious, if I send a transaction from one address to another, how do they verify it without knowing my private key?
5
votes
3answers
1k views

Would it be possible to provide a downloadable blockchain that is updated and verified by a mass of people?

As of November 2012, the blockchain is nearly 3 GB in size with a near-linear growth of about 500 MB/month (cut from exponential growth by the hard-coded block size limit, I guess). I want to install ...
5
votes
1answer
749 views

Does 'simplified payment verification' work?

I was reading the original bitcoin paper where they mention a simplified payment verification scheme in section 8. I was wondering whether or not this actually works. A quick sketch: The scheme ...
5
votes
1answer
826 views

How does a client get the merkle branch of a transaction?

When the Bitcoin client receives a transaction, it checks if the transaction is confirmed. This is done by verifying that the transaction hashes correctly, in the merkle tree, to the merkle root in a ...
4
votes
2answers
911 views

How can someone verify the signature of a Bitcoin ECDSA signature without knowing the signer's public key?

I understand how ECDSA exactly works and for verification of a signature, the public key of the signer is required. But in Bitcoin, public key is double hashed and the only information the receiver ...
4
votes
1answer
528 views

Block verification time

Does block verification time (by all nodes in the network) takes up a large portion of the total block propagation time? What is the percentage, on average?
4
votes
1answer
428 views

Should I verify the Bitcoin Core release signing keys?

I have been running Bitcoin Core on an old Macbook for about a year, and I updated to v0.18.0 a couple of months ago which I downloaded from bitcoin.org. I have recently been delving deeper and I ...
4
votes
1answer
116 views

What is the point of comparing sha256 of downloaded file with published on the same website code? [closed]

Some websites publish sha256 to check authenticity of downloaded file. I suppose this is to protect against man-in-the-middle attack - that my file was not altered during download. What prevents man-...
4
votes
1answer
276 views

Do all block have to be verified every time a new block is broadcasted?

I did a presentation for my office and during the presentation I was asked a question that I was not prepared for. It's a more technical question from my perspective, but someone here might already ...
3
votes
2answers
879 views

Is it possible for a valid block to be added to an invalid one, and have it accepted by another client?

This wiki page says invalid blocks aren't counted towards determining chain length and that make me want understand how invalid blocks are treated. Can an valid block be added to an invalid one.. and ...
3
votes
2answers
7k views

How do I “Verify my wallet” [closed]

I'm completely new to the BitCoin world and I've purchased a couple of coins through eBay. The seller has messaged me saying this: "Donation sent to 1Nf9iW******Yx4cPKB ...Please verify wallet and ...
3
votes
2answers
494 views

How do you know that Block, the Merket Root & the hashes in the path are authentic?

I went through this Q & A on Merkle Root What is the Merkle root? And several others on the Merkle Root & the Merkle Tree. I understand what is a Merkle Tree & how you can take use your ...
3
votes
2answers
1k views

How to check if raw transaction is signed?

I have a raw transaction and would like to check if signed or not. How can I do this. I tried using bitcoind and verifying a transaction from be blockchain but it says its not complete. $ bitcoin-...
3
votes
1answer
782 views

Ethereum - how is the output of a contract computation verified? [closed]

This may be as simple as a pointer to some place in the docs I've missed, but how/where is the output of a contract's computation checked, or assured against a malicious miner with an intentionally ...
3
votes
1answer
4k views

Miner username and password - does it need to be unique in the major pools?

Every Bitcoin mining pool relies on Basic Access Authentication to identify the user and credit their account for the work performed. But does this identification in form of username and password have ...
3
votes
1answer
987 views

How do I check if an address belongs to my wallet using bitcoinJ?

I'm using bitcoinJ and I want to verify if some of the destination addresses in a transaction belongs to my wallet when I receive a amount of bitcoin. How can I verify it?
3
votes
3answers
1k views

Tracking transactions as a Receiver

I have a question concerning the transaction of bitcoins. If, for example, I send some BTC to a specific address, does the receiver have any chance in verifying that I have already sent the BTC, ...
3
votes
0answers
74 views

How many bitcoin transactions can be verified per second on commodity hardware in 2020?

I am trying to figure out how many Bitcoin transactions could be verified per second. Am I correct that signature verification is more expansive than computing Merkletrees and hashes and constitutes ...
3
votes
0answers
2k views

Why MtGox does not accept a bank statement as proof of address for verification? [closed]

To increase the transaction limits on a MtGox account you need to submit a personal ID (passport or drivers license) and a utility bill (electricity/water/gas/phone) as a proof of address. It is ...
2
votes
1answer
272 views

Verifying a bitcoin Signature and what is the transaction data that is signed?

Given a bitcoin transaction where it is able to redeem it's UTXO's, how can I verify in Java if the signature is actually a valid signature or not. I was trying to use the Bouncy Castle library where ...
2
votes
1answer
319 views

How was the overflow bug of 2010 detected? Should UINT64_MAX value transactions be considered suspicious?

The overflow bug of 2010 was a result of a client that summed two values together and reaching INT64_MAX instead of UINT64_MAX. Should transactions of INT64_MAX (or any similar constant) be treated ...
2
votes
3answers
792 views

How does the receiver of a transaction check the whole chain of ownership?

While reading Satoshi Nakamoto's paper on how bitcoin works, I got stuck on #2. In a chain of transactions, how can someone who has received the coin check the whole chain with just a signed hash of ...
2
votes
3answers
1k views

how do nodes verify that a block has been solved and can be added to the blockchain

when a miner solves a block it gets sent out to the network, when other nodes receive it, how do they verify that the block received was indeed solved and can be added to the blockchain. So you don't ...
2
votes
1answer
210 views

Transaction verification process in full nodes

I'm having some trouble understanding the process of transaction verification on full nodes. I understand how a transaction is verified via public cryptography (hashes, signature, etc, as it's ...
2
votes
1answer
336 views

Verification of transaction once trasaction is broadcasted

I have few doubts regarding verification of transaction and am trying to find answers from last few days. I agree similar post exist in this portal but I am not getting satisfactory answer for my ...
2
votes
1answer
17k views

GUI Miner no responses to getwork, and Verification failed

I just starting with mining today I have everything set up for slush pool on GUIMiner - v2012-12-03 . I'm not sure what is wrong but this is what the console says 2013-06-21 01:37:26: Listener for "...
2
votes
1answer
458 views

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 ...
2
votes
1answer
492 views

Verifying a legitimate version of bitaddress.org on Windows

How can I make sure I am accessing (online) or have downloaded (as an HTML file or from GitHub) a legitimate, trustworthy version of bitaddress.org? In other words, how can I make sure no hacker has ...
2
votes
1answer
459 views

why verification of transaction after proof of work?

I have question about bitcoin protocol. In Satoshi's paper it is mentioned that: New transactions are broadcast to all nodes. Each node collects new transactions into a block. Each node works on ...
2
votes
1answer
255 views

What are zkSNARK parameters and how to verify them?

When installing the zcash client for the first time it downlods a bulk of around 900 MiB in zkSNARK parameters. I am wondering: why and what are they exactly used for? Is this a security feature? How ...
2
votes
1answer
1k views

Mtgox account verification pending, how to withdraw my bitcoins?

I had submitted my personal document for verification over 30 days; however, my account still pending for verification, what I can do to withdraw my bitcoin?
2
votes
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 ...
2
votes
1answer
160 views

Address Verification Failed / View on Tresor Address don't Match

Using LTC wallet on new Trezor. On "Receive Payment" tab, clicking eyeball icon, the address shown on the Trezor does not match the address shown on screen. What gives? Did I already get hacked?
2
votes
0answers
41 views

Proving sendership of transactions

Why does Bitcoin Core, on the message verification tab, say that verifying messages signed by Bitcoin addresses "only proves the signing party receives with the address, it cannot prove sendership of ...
2
votes
0answers
61 views

Bitcoin payment verification [duplicate]

I am having a tough time in understanding how Bitcoin payment verification works: How is Merkle tree related to Bitcoin blocks? Had Merkle tree not been there, what would have been the problem?
2
votes
1answer
520 views

Multi-Signature Transaction - Verify First Signature is Valid?

Using Gavin Anderson's TwoOfThree.sh Gist located here: https://gist.github.com/gavinandresen/3966071 Is it possible to verify the first "partial" signrawtransaction is valid from the known public ...
1
vote
1answer
129 views

bitcoind - how to find out what is affecting the verificationprogress

Problem Bitcoind verificationprogress continues to go up and down around .99999xxx and never finish verifying Background Looking for any insight here, had a node that went down and upon bringing it ...
1
vote
2answers
3k views

How can transactions be verified without the private key?

Trying to get my head around her royal Bitcoin here... I understand that blocks of transactions are broadcast to the network, and that miners verify that the BC is 'spendable' by trawling the ...