Questions tagged [verification]

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1answer
38 views

Can you verify partial blockchain information from a third party, without yourself having an entire blockchain?

I'm considering consuming, or if unavailable, I'm considering providing, a bitcoin blockchain querying service along the lines of json rpc. Would it be possible for me as a consumer of such as service,...
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75 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 ...
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2answers
74 views

Multisignature technology in bitcoin - math and code

I am interested in the math and code behind bitcoin multisignature technology. I've been looking for actual code that creates a multisignature address/pub key, and verifies transactions/digital ...
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1answer
48 views

How can a reciever verify that transaction data was not altered by 3rd party?

My scenario: My web server: - Generates private and public, and a wallet address from the public key for a user website account - Server can not connect to the outside (Can not connect to the Bitcoin ...
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1answer
53 views

How to verify locking and unlocking scripts?

I've selected an arbitrary transaction id and retrieved its associated transaction details using the blockcypher explorer as follows: from blockcypher import get_transaction_details ...
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0answers
38 views

How verify (in C++) input signature?

First small problem: blockchair.com give me only output scripts, not input - is any blockexplorer online with it? I read binary data and this may be hard recreate my sample data and verify. I test BTC ...
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1answer
597 views

Bitcoin i have been asked to send money for a private key [duplicate]

Hi i have been asked to send money for funds that are nonspendable to receive a private key to unlock it, it's from bitcoin investing. How safe is this as i'm worried i wont receive the payment. It's ...
4
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1answer
430 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 ...
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3answers
140 views

Why do I have to deposit BTC as missing turnover

I accidently transferred BTC to a non existing wallet. The wallet is now being created and I have to activate and verify it. To activate and verify I have to deposit 4,9 BTC. Is that how it works? Why ...
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2answers
149 views

How Bitcoin dose find and verify UTXO ? is this efficient?

If Bitcoin sees all blocks, it will be very slow based on chain length and block size but, it can certainly verify incoming transactions. I know that blockchain is never modified any previous block. ...
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1answer
273 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 ...
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1answer
67 views

Running bitcoin node with already verified blockchain

I'm following this guide https://stadicus.github.io/RaspiBolt/ to setup a bitcoin full node on my new raspberry pi. I already downloaded and verified the blockchain on my host machine. I also pruned ...
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1answer
56 views

Transaction verification engine

In the Features of Bitcoin Core i found following Line: "Bitcoin Core includes a transaction verification engine" Please define Validation, is Validation = verify or not. Does the Engine verify ...
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1answer
132 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 ...
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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?
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3answers
474 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 ...
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2answers
67 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 ...
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2answers
133 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 ...
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1answer
607 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 ...
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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 ...
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0answers
101 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 ...
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0answers
120 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
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1answer
493 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 ...
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0answers
175 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?
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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 ...
2
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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?
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1answer
54 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 ...
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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 ...
2
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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 ...
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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 ...
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1answer
222 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 ...
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1answer
499 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
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2answers
496 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 ...
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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 ...
2
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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 ...
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2answers
503 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 ...
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1answer
91 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 ...
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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 ...
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0answers
100 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
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1answer
990 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
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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 ...
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2answers
324 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 (...
3
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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-...
4
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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 ...
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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 ...
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0answers
62 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
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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 ...
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2answers
404 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 ...
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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 ...
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1answer
123 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 ?