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Questions tagged [block-validity]

The tag has no usage guidance.

6
votes
1answer
227 views

When Schnorr signatures are part of Bitcoin will it be possible validate each block with only one signature validation?

In a recent talk Pieter Wuille talked about speed up verification when using Schnorr signatures and various algorithms for verifying multiple signatures. Would it really be possible to verify one ...
1
vote
2answers
65 views

Do miners become temporary dictators of blocks they mined?

This is something I've read here: https://blockgeeks.com/guides/bitcoin-forks-guide/ "When a group of miners discovers and mine a new block, they become temporary dictators of that block" Can anyone ...
1
vote
1answer
53 views

How long does it take to validate a full block?

I'm interested to know how long does it take to validate a Bitcoin block on average home pc. I'm less interested in a precise number. I'm fully aware that it can be different between different ...
4
votes
2answers
88 views

How are blocks verified?

I see in the bitcoin wiki there is something called "script" which compiles down to some bytecode to be run by a very very basic virtual machine. Does this mean that each block is actually just a ...
0
votes
1answer
133 views

How do you get Sibling Hashed Values in a Merkle Proof?

Merkle Proofs are one of the main reasons that people attribute Bitcoin's use of Merkle Trees. But I'm struggling to understand how these work in practice. Please explain theoretically as well as ...
0
votes
1answer
415 views

Why A Block have a Merkle root hash? [duplicate]

That is the question, why a block needs to have a Merkle root hash, as Iundestand, once a block is mined the hash value of this block is stored at the header of the next one so, it generates the chain....
2
votes
3answers
132 views

How do I know that a node provides the accurate blockchain

When I connect with a wallet to the bitcoin network, how is the balance actually retrieved? One node? Or more? I understand it is a sum of all transactions. But when I load my wallet I assume I ...
1
vote
1answer
51 views

What is the correct use of the term “validating”?

First, in the Bitcoin context what does validating mean? Second, is it incorrect to say something like " the average time it takes to validate a block by the network is 10 minutes." The way, I ...
1
vote
1answer
76 views

What happens to rejected transactions ( i.e double spend or invalid transactions)?

Do they get put in an orphaned block or not get put into any block at all?
0
votes
1answer
42 views

How can one full node know whether other full nodes added certain block to their blockchain?

How can one full node know whether other nodes agreed a block suggestion of a miner (so it will know whether to add the block to its blockchain too)? thank you
1
vote
4answers
287 views

What stops a miner from including arbitrary transactions in their block?

Suppose there is a miner who consistently cheats. That is, she will include "Alice sent me 100 bitcoins" in every block she creates. If she became the first miner to find a passable hash, then she ...
0
votes
4answers
101 views

What would happen if two miners were mining two blocks with two different set of transactions?

If two miners picked from the mempool two different sets of transactions, that were not dependent on each other. Then could both miners, mine both blocks and not create a fork? So miner 1 finishes ...
4
votes
3answers
234 views

Why do miners validate transactions?

It seems that if most transactions are valid, a miner could save a little time and increase its chance of mining a block by not validating. Is the reason that there are enough invalid transactions to ...
2
votes
0answers
183 views

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 ...
2
votes
1answer
740 views

Bitcoin Core - Go back to a specific block?

I have a full node of Bitcoin Core wallet. I would like to know if it's possible to delete data after a certain block. For example Bitcoin is currently at block 504385. There was a fork around block ...
1
vote
2answers
142 views

How does the protocol prevent miners from building off of a fraudulent blockchain?

Let's say someone creates a fraudulent block and finds a nonce that solves the hash puzzle. This block is broadcasted, its hash easily verified, and it's added to the blockchain. What prevents a miner ...
10
votes
2answers
2k views

Can someone explain this weird mining activity?

I can't figure why this block has 0 coinbase with 0 transactions... however still a valid block? Or it it empty? According to whalepanda this coinbase was sacrificed by unknown miner. See the block ...
1
vote
2answers
288 views

Valid block on top of invalid block

I have been researching a little on the concept of blockchain for some time now. If there is any corrupted block then others won't try to build blocks on top of it. But suppose for some time if it ...
1
vote
1answer
55 views

What prevents a node from sending a different version of the blockchain?

I understand that proof of work prevents a node from creating a new version of the blockchain unless they have >50% of the hash rate, but what if the attacker is also able to intercept the victim's ...
2
votes
2answers
62 views

In blockchain, particular bitcoin why is difficulty not part of the Block but merkleroothash is

After some consideration I came up with two assumptions, please correct me if I am way off here. The merkleroot being part of the block information is a validation shortcut? Difficulty not being part ...
2
votes
2answers
206 views

What forces transactions to be visible to all miners?

How are transactions provided to the miners? And what keeps the following scenario from occurring? A valid transaction is initially reported to a "rogue" node, A, in the network. If that node is a ...
1
vote
1answer
29 views

Which sender is banned in case of nvalid transactions or blocks?

When a node receives an invalid transaction or block, as far as I know, it bans the sender for 24 hours. However, I didn't exactly get which sender is banned. Is it the neighbor node that provides the ...
2
votes
1answer
311 views

How does a non-upgraded node read a SegWit transaction? [duplicate]

I'm trying to understand how my node would interperet a SegWit transaction if I do not upgrade. Even if I do not upgrade, I should be ...
9
votes
3answers
7k views

How long does block validation take?

Assume a miner receives a new block from a connected peer. Please correct me if I'm wrong: The miner validates the newly received block before using it themself and sending it to their other connected ...
5
votes
1answer
188 views

How does Bitcoin avoid splitting into multiple p2p networks?

So since Bitcoin is completely decentralized what stops multiple p2p networks from being formed? And what happens with the block chain when two separate P2P networks eventually reach each other? Will ...
1
vote
1answer
121 views

How does the Bitcoin network checks if the miner has changed the mining reward? [duplicate]

You know the mining reward is just a number in the code,what if a miner changed it?
2
votes
0answers
616 views

PoS coin is producing conflicted chain after merging with upstream developments

I'm sorry about the title, but I could not think of a more condensed way to describe this problem. I forked an older version of blackcoin a while back to make a test altcoin for fun. I have been ...
2
votes
1answer
118 views

Is it possible that someone forks the chain?

I'm not sure I understood everything but all the clients always keep the longest chain, ok. So, what happens if an evil person injects bad transactions in a block and successfully mine it (given the ...