New answers tagged blockchain
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Something not mentioned in the other answers, and which your question implies you are unaware of, is that there is no requirement that one have any transactions at all. If you want to mine a block that consists of nothing except you getting the block reward, that is a perfectly valid block. This is something that has happened, although it was more common in ...
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I want to update the status of the Bitcoin parser projects, one month ago I have released the new Bitcoin parser caller SpyCBlock, it resides to github at this link.
SpyCBlock is a simple parser multicore written with C++11, it parsing the file blk****.dat and produce different serialization, like:
Serialization JSON Bitcoin blockchain.
Serialization Graph ...
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This will not work, because a block's content includes the previous block's hash which means that a valid block can only be mined after the previous block is known.
The dummy transactions would not yield a reward to the miner, because the transaction fees are just going from the miner's left pocket to the miner's right pocket. The miner will only gain the ...
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What prevents this is the requirement to have the hash of the previous block's header in the new block header which is then put through Proof-of-Work. The hash of the previous block's header cannot be known until it is created, making it impossible to compute the work ahead of time. The miner cannot just pick any old block header to base his new block on as ...
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Python 3 parser available here https://github.com/alecalve/python-bitcoin-blockchain-parser
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Does the actual bitcoin price depend on the mining profitability?
I don't know what the price bitcoin depends, but if I understand your question, it is better to write: The mining profitability depends on the bitcoin price?" now have more sense (in my opinion)
At this question, the answer is yes because if the miner makes X bitcoin from mining action if ...
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Unless you're a miner you can't get that info. You can get the information of the last block but in order for the current you would have to mine it yourself and then win to be correct.
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I think you are referring to consensus..if you try to go back and add something to a prior block and transmit it to the network the other nodes will reject it..
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how does a block know that its transactions have tampered with in the
first place?
It is not the block that knows this; it is the nodes which verify that.
To quote the bitcoin whitepaper:
When a node finds a proof-of-work, it broadcasts the block to all
nodes. Nodes accept the block only if all transactions in it are valid
and not already spent.
...
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It's possible to do this externally, but it's tricky to get right and a cause of loss of funds if you do.
You need to correctly identify transactions you can spend. This is relatively trivial with P2PKH addresses, but a little more involved if using more exotic script types. You need to understand rules like transaction maturity before considering a UTXO ...
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Blocks include more than just those 3 variables. One of the most important ones is the merkle root. This is the hash of all of the transactions in the block, in a particular order. If different transactions are included or they are included in a different order, that merkle root is going to be different. So if each miner has a different merkle root, then ...
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It appears that the answer is yes. I have not fully established that it was successful, but it looks like it's headed that way. Here are the steps I followed:
Shut down the pruned node.
Edit bitcoin.conf to change pruned=10000 to pruned=0
Update the startup script to point to the new 400GB volume that already has the blocks folder on it.
Copy everything ...
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Questions like this are off-topic on this forum, however I'll take a stab at answering your question as you seem to have a lot of misunderstanding.
The bigger question you need to ask yourself if why you want to implement your e-commerce application on a 'blockchain'? It would be a gross neglect for basic engineering design principles as blockchain is ...
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Even though the software defining the Litecoin network is derived from Bitcoin's, Litecoin is a completely independent network with incompatible consensus rules.
Most notably Litecoin's Genesis block differs from Bitcoin's and therefore not a single block or transaction overlap between the networks.
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I analyzed a bit with forensic tools and found that with high likelihood either you or the scammer (or both) have an Huobi.com account.
If I understand you right then 03281a511f38992dff51dee176c66dfc5f873e92cd76228956ca5099a27214fd shows the scam transaction and the input addresses on the left side are yours and you initiated the transaction?
If yes then ...
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It’s not self contained. The chain state contains references to the positions within the blocks which are unique to the sync state.
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"SPV mining" refers to a bad practice where a miner starts hashing a new block on top of an unverified parent block. If the parent block turns out to be invalid due to a double spend or newly activated soft fork, the new block will also be invalid.
The term SPV in this case is used because the miner only verifies the headers of the incoming block and then ...
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The transaction has been cleared on the blockchain
How did you know that? Did you query the corresponding transaction on an online blockchain explorer?
If you are happy to trust third party services (like the online blockchain explorer you had used), then generally speaking, (you believed that) you have already received these bitcoins.
You just have not ...
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The wallet itself is still downloading the block and is 3 years and 29 months behind. Does this mean I must wait until this finishes before it shows up?
Yes, in order to understand the current state of the network (which includes the transaction that you received funds in), your node will need to work through the blockchain history. Otherwise, your node ...
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(2) Based on the previous block hash, I calculate the possible block
header combinations of the nonce, the version number, the timestamp*
and the Merkle root. The goal is to simply find a valid block header
which has a lower hash value than the current target.
The block header is 80 bytes size:
version: 4 bytes.
previous hash: 32 bytes.
merkle root: ...
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Wow! Thanks so much for the informative answers. However, after a frustrating search for a solution, I eventually found one. This video I found really helped me, I didn't make any upfront payment. And I believe it can help a whole lot of victims and investors.
Bitcoin Recovery Testimony
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What you have described will convey no advantage; your expected success rate is still just dependant in the amount of hashpower you control, relative to the rest of the network.
If you construct a block that has a valid block hash, then you should immediately submit it to the network so that yo have the best chance of having your block included in the ...
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You should call their support. They did not make the payment that receipt says that they made.
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