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Questions tagged [verification]

The tag has no usage guidance.

3
votes
1answer
251 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?
1
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0answers
91 views

How verify p2sh spending transaction signature using public key with btcsuite?

I'm trying to verify inputs signatures in Go using Verify Signature script of package btcec. Decoding this p2sh spending transaction rawSpendingTxd := ...
-1
votes
0answers
13 views

Does Elastico support transactions with multiple inputs?

Elastico: https://www.comp.nus.edu.sg/~loiluu/papers/elastico.pdf The paper mentioned a possible double spending checking logic in section 10.2. From what I understand, transactions are sharded into ...
0
votes
3answers
200 views

What are the realistic system requirements to run bitcoin core for generating wallets, signing and verifying messages on a laptop?

I need to be able to verify messages and check that funds in wallets are valid and that the claimed owner possesses the private keys (hence checking messages signed). I know that I need to be able ...
0
votes
1answer
27 views

Do mined coins show up on blockchain explorers and can the balance of the addresses that mined the coins be seen?

Somebody wants to do a deal for a bitcoin transaction but when proof of the coins is required they say that the coins will not show up on blockchain.info as they were "mined coins". Is this really ...
0
votes
2answers
79 views

Bitcoin Core LevelDB Index saves forked blocks

I've noticed that bitcoind will permanently save unverified blocks that it receives even if they turn out to be small blockchain forks, likely occurring from the relatively simultaneous discovery of ...
1
vote
1answer
385 views

How can one verify the address you are sending BTC to

I've had an incident with an exchange that provides addresses to deposit BTC funds. For some unknown reason, the exchange is telling me they have never received the funds. I read the address with a QR ...
2
votes
1answer
357 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 ...
1
vote
0answers
96 views

How long to verify transaction is not overdrawn?

Given that the block chain is 140gb now, how long does it take a node or a miner to verify that a transaction is valid i.e. Not giving negative balance for an address? Also, given that the number of ...
0
votes
0answers
118 views

Buying a coin only available on Bittrex (also Poloniex)

Is there an easier/alternative route to go about purchasing a currency that is only being traded on Bittrex? After attempting the basic verification, I received an error saying that there was NO ...
2
votes
1answer
287 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 ...
1
vote
0answers
157 views

Buying Bitcoins without verification and documents [closed]

I need to buy Bitcoins with Visa or MasterCard, but without verification and documents. The amount of purchase is large. Can you suggest such online services?
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 ...
1
vote
0answers
90 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?
0
votes
1answer
53 views

Do I have to try to mine bitcoin in order to verify peoples transactions?

I started investing in bitcoin about a year ago, did minor research and decided mining wasn't worth it because of the odds against finding a bitcoin. Lately I've started wanting to verify peoples ...
7
votes
1answer
641 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 ...
2
votes
1answer
404 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
0answers
35 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 ...
0
votes
1answer
208 views

Chainstate database verification

When you download the blockchain, do you download the chainstate too or it has to be generated by your own machine (it says that theoretically can be rebuilt from the block data but it is time ...
1
vote
1answer
482 views

Understanding blockchain 'under the hood' how a block is created

Bitcoin newbie here: I'm trying to understand the concept of the blockchain but what I don't get is what's going on behind the scenes? So let's say that there are only 10 miners in the universe and ...
3
votes
2answers
450 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 ...
6
votes
2answers
2k 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 ...
2
votes
1answer
228 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 ...
0
votes
2answers
464 views

How is it possibile to verify payments without running a full network node?

I've read the Nakamoto's paper "Bitcoin: a peer-to-peer electronic cash system". In paragraph Simplified Payment Verification he said that is possible to verify payments without running a full network ...
0
votes
1answer
86 views

setting up and verify a wallet under special circumstances

A friend of mine has a problem in verifying a wallet for the following reason. Since about 40 years he has been denied a passport and a normal ID card by the german authorities after he handed in his ...
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 ...
1
vote
0answers
90 views

Why do transactions get verified before it is clear that the block header is valid?

When I researched for the answer on What happens in detail, when Bitcoin Core verifies a block during synchronization?, I noticed something: According to the Wiki-Entry on Protocol rules some of the ...
3
votes
1answer
843 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
1answer
769 views

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

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 ...
1
vote
2answers
310 views

How instantaneous is a Bitcoin transaction?

How quick does a bitcoin transaction happen? (assuming that both parties are online at the time) I read somewhere on the Internet that it's not recommended to accept a bitcoin payment right away (...
2
votes
2answers
811 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-...
4
votes
2answers
763 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 ...
1
vote
2answers
2k 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 ...
2
votes
0answers
59 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
3answers
714 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 ...
0
votes
2answers
382 views

Payee identity verification

When reading the Bitcoin paper by Satoshi, I noticed that he didn't mention any protocol by which the payer can verify the payee's identity, i.e. he is indeed paying the intended recipient. I would be ...
2
votes
1answer
154 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 ...
1
vote
1answer
114 views

Transaction verification up to coinbase?

Do full nodes verify the entire transaction chain up to coinbase when verifiying a single transaction to be included on the block which they are working on ?
7
votes
1answer
440 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 ...
0
votes
1answer
665 views

Using blockchain to publish downloadable software verification codes

What is the point of comparing sha256 of downloaded file with published on the same website code? Why can't developers of currencies publish file version and sha256 hash on blockchain as alias or ...
4
votes
1answer
105 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-...
7
votes
2answers
479 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?
2
votes
1answer
311 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 ...
5
votes
4answers
3k 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 ...
2
votes
1answer
490 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 ...
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?
1
vote
2answers
667 views

How exactly does a block get constructed and verified?

From what I understand, a new block contains all the transactions within the last 10 minutes. So when Alice sends Bob 10 BTC, how does this information get put onto the newest block? I guess I am ...
7
votes
2answers
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.
5
votes
2answers
5k 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?
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) ...