Decentralization – Why is proof of work required in Bitcoin?

The proof of work is not Required fieldsthere are other algorithms, such as proof of participation, which are still decentralized (although I do not know how it works, even if Ethereum wants to use the proof of participation extraction). The proof of work poses a difficulty to a block by saying "there must be at least X zeros in a block". (X does not have to be an integer, if it were, the difficulty could only be adjusted in the order of two, four or sixteen years, now it is a little over 16.8). This addition of zeros controls the number of problems that can be solved. , and is usually in the order of hundreds or tens of hundreds (less) per day. When there are more minors, the network responds relatively quickly by raising difficulties (in less than 2 weeks), and when there are fewer, it also reacts by doing the opposite (possibly more than 2 weeks). Proof of work is like a lottery, and whoever solves the problem is randomly selected and then receives the prize via the coinbase. Proof of work is basically a checking mechanism that examines zeros in a hash (job) and forces a number (minimum) to zero.

How to send bitcoins from offline bitcoin without synchronized balance? (0 balance but has a little balance on the blockchain)

I prepare a cold wallet. How can I generate a signed gross transaction from the main Bitcoin wallet?

PS: I've generated the portfolio using getnewaddress in console since the bitcoin-qt GUI

Thanks in advance

Block validation in the blockchain – Bitcoin Stack Exchange

Yes, in general, Node A will send the entire block with all transactions in full to other nodes for validation. The destination nodes will receive an entire block with everything in the block header and all the transactions in the order required by the Merkle root. They will validate all the contents of this block.

There is a network optimization where Node A would send the block header, the transaction coinbase, and the list of transaction IDs of transactions in the block. This saves network bandwidth. Using a list of transaction identifiers (and not all transactions), node A assumes that the other nodes already have these transactions because they were in its mempool (ie, that these transactions were not confirmed and were broadcast on the network before a minor included them a block). The receiving nodes would then extract these transactions from its mempool tool and rebuild the block. If there are missing transactions, these are requested at node A.

The end result is that they have built a block that looks exactly the same as the one in node A, which is the same block. They can then pass this reconstructed block through the same verification functions as they would with any other block received in its entirety.

This optimization is known as Compact Blocks.

Whatever the case, when node A sends a block to another node, the node is left with a block containing the block header and all the transactions contained in the block. Node A always sends the list of transactions included in this block.

money transfer – Can I withdraw Bitcoin without proof of source?

I have about 25 BTC since the time when Bitcoin was about $ 10 or less. At the time, a friend sent me out and I never thought that they were worth a day. Since then, I have moved them and I do not think I have an original portfolio at this time. I have no solid proof of the initial transaction (maybe an old Skype chat log). I'm afraid if I tried to pull them out and take them out of my bank account, I would lose everything or worse.

From what I understand, if the government decides to investigate the transaction, it could seize it and put me in jail. The burden of proof is on me no? What is the best / worst scenario? Any suggestions on how to approach this?

A general answer would be fine, but to be precise, I would debit in my American or Canadian bank account.

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Calculation of mining operation – Bitcoin Stack Exchange

My goal is to understand bitcoin.

I've read what happens during a transaction and I wonder about it:

1) That's what I understood but I'm not sure: when a transaction occurs, the miners calculate a cold value "working prof". This value is calculated to get a value of 0 (or something very close to 0) for the hash of the value + the transaction + the last pow. That's all?

2) How is the calculation done? Is it basically a brute force? I mean try a hash, then another, etc.

3) I read that this calculation takes about 10 minutes. Does this mean that the people who make the transaction have to wait 10 minutes? (Imagine I want to buy a drink with Bitcoin.) The waiter has to wait 10 minutes to make sure the transaction goes well before giving me a beer?

4) The work of the minor is therefore to calculate a work prof. But I read the minor discover new bitcoins too. Is this another form of mining? I do not see the connection between the calculation of the prisoner of war and the new bitcoins)

5) I read a day that there will be more bitcoin to mine. But we will need a minor forever to calculate POW? There is something strange for me.

Thank you

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mac – MacOS: How to run Bitcoin Core GUI after compiling from sources?

I've built Bitcoin Core from sources by following this guide:

And make it work on the command line via: ./src/bitcoind

The screenshots of indicate that there is a GUI.

Screenshot of Bitcoin GUI

However, the guide does not mention (at the time of writing this) how to operate the GUI.

So where do I find it? How can I run it?

Please, help me recover my bitcoin

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Please, I need some serious help, I have sent a bitcoin to an address only to wake me up and see a different address, instead of l '& bit bit,,,,,,,,,,,,. send, it is transferred to a void recipient, please, I must rectify this