Related to Bitcoin Blocks

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Avarage block size

Has someone calculated the avarage block size (e.g., for a day)? On blockchain.info there are a few blocks listed with their size, on the top of the page :/
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1answer
35 views

Call function for block n on blockchain

I've been going through main.cpp in order to roughly find out which function calls the best block and I found out depending on situation there are several similar-sounding function names and code ...
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27 views

Where is UTXO stored?

When a new transaction is received it is added to the memory pool (after checking for conflicts). While mining, only the transactions which are in the pool are considered. What happens to the ...
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23 views

Exactly Who or What Assembles Transactions into Blocks? [duplicate]

Users broadcast transactions into the network. Miners find and compete to validate blocks created every ten minutes by combining transactions. Who or what assembles the transactions into blocks ...
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32 views

Which function is called to mine a block, broadcast the newly mined block & receive a newly mined block?

I am trying to understand the control flow and handling of transactions in the memory pool.
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255 views

Will a new block be found immediately, when there are enough transactions to fill a block?

I am trying understand the Bitcoin verification process. What happens, if a new block has not been found and there are enough transactions waiting to fill the current block size limit? Will a new ...
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1answer
79 views

What's the purpose of a maximum block size?

Bitcoin has a maximum of 1 MB of transaction data in each block. Why is this limit present? When was it added? Was it intended to be temporary, as some people have said?
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50 views

Is it time to move data storage (of things like music, images, virus definitions) out of the block chain?

This is a technical question and I don't have the answer. I would like someone to explain why this data is necessary. If your answer is receipts or smart contracts, then my question is, "Why not put ...
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1answer
33 views

Parameters in UpdateTip - calculation of log2_work

I looked up log2_work inside main.cpp and I can't follow its calculation by log(chainActive.Tip()->nChainWork.getdouble())/log(2.0). a) What is -> explicitely indicating? (I'm at basic level of ...
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18 views

Stopping Hash field in GetBlocks Message

Reading Bitcoin Developer Guide, I couldn't fully answer following question: What is the exact purpose of the Stopping Hash field inside a GetBlocks Message?
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1answer
39 views

Transaction inclusion into block

What are reliable and good sources for understanding the procedure of transaction inclusion into a block? Problem outline: Given, there are multiple peers - let's say 5 - in a test network, where 3 ...
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1answer
29 views

Regtest: One node nullifying other node's balance

I'm running 2 bitcoind servers on the same machine, called node0 and node1. In the following I'm listing steps I take and results I get and I'm wondering what is causing one node nullifying other ...
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1answer
23 views

Why Block351543 is older than Block351542? [duplicate]

I am a little confused here. Why the Age of older Block[351542] is younger than Block[351543]. Here is the screenshot from blockchain.info
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What happens when the Block Reward of a Currency is Changed to a Greater Value? [duplicate]

What Happens if the Reward for block solving is changed to a very great extent and if most / all of the users update to that version with the edit.. For example if block reward is 12 x and it is ...
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2answers
85 views

How does “headers first” effect BLKxxxx.dat structure?

Assuming a full node running Bitcoincore v0.10 (with txindex=1), how exactly does the new "headers first" functionality affect the structure of the blockchain data? (Specifically, the blkxxxx.dat ...
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1answer
55 views

Bitcoin transactions over Ripple Network

I am interested in using the ripple network in conjunction with bitcoin transactions, but am curious as to interplay between the ripple ledger verification and the bitcoin blockchain verification. I ...
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2answers
78 views

Is there a special name for the block currently at the head of the chain?

Just as we have the genesis block which is block 0, is there a special name for the block currently at the head of the chain? Obviously such a block would be observer dependent and never absolute but ...
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1answer
39 views

Energy to confirm one block?

What is the minimum energy (or CPU operations) required for someone to confirm one block on their own, to launch a double-spend attack? How can I calculate this from the current difficulty or ...
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0answers
28 views

What is the minimal block time practically possible? [duplicate]

There have been so many altcoins that experimented with parameters like block-time, and I was wondering what turned out to be the minimal feasible time? If its 10 seconds for example, there will be ...
2
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1answer
37 views

How do thin-clients know in which blocks to look?

Using SPV the client can assure that a transaction is inside a block, but how does it know in which blocks to look?
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0answers
36 views

If only six blocks are solved per hour, then how are more than six miners getting paid per hour? [duplicate]

According to this page on average six blocks in the Bit Coin network are solved per hour, yet there are thousands of Bit Coin miners and presumably more than six of them are making money every hour. ...
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2answers
38 views

What is Namecoin's blocksize limit?

Bitcoin's is 1MB at the time of writing this. Seems like Namecoin would have to be bigger due to it proving 512 bytes of storage with a name update, but it also has slower average block times(about 20 ...
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1answer
137 views

Pruning the branches in Merkle Tree

In Merkle tree, leaves are actual transactions and internal nodes are hash of their childrens. In the Bitcoin paper, Satoshi talks about pruning branches in the Merkle tree to save storage space. ...
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1answer
547 views

What are the arguments for and against the increase of the block size limit?

Can someone give a quick point by point list, what arguments the proponents and opponents of increased blocksize have for their case?
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70 views

What is the purpose of Merkle Tree in blocks?

The leaves of the Merkle Tree has the hash of the transactions. How are transactions stored in the block? What is the purpose of Merkle Tree.
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1answer
70 views

Verifying Bitcoin ownership

Suppose Alice has 30 bitcoins from David. Now Alice wants to transfer amount 20 bitcoins to Bob. Now, Alice creates a transaction with Bob's bitcoin address. To prove authenticity and integrity, ...
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1answer
90 views

Correct Citation Format for a Bitcoin Transaction

When writing an academic style paper where specific bitcoin transactions are used as examples, is there a standard format to "cite" a bitcoin transaction? If not, what do you think an appropriate ...
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1answer
112 views

Which cryptocurrency has the smallest block time?

What is the lowest block time of any cryptocurrency? I don't mean the time of an individual block, but the target time per block. What is the shortest reasonable block interval?
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Do P2Pool nodes always accept real blocks over share blocks?

The standard rule in bitcoin is that if you see two blocks on a chain that has the same work, you accept the one that you saw first as the correct one. If this extended to P2Pool chains, some nodes ...
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What is the cause and effect of all this 'mining'? [duplicate]

It seems mining is a reward system for the exchange of 'solving complex mathematical problems'. What 'exactly' is the 'complex mathematical equations' being analyzed in the mining process? How is ...
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1answer
107 views

How does merged mining work on a technical level?

In bitcoin, miners hash header twice with the SHA256 function. This header is consist of the below fields, as described by this question. version previousHashBlock merkleRoot time difficulty nonce ...
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1answer
93 views

What is a block?

I know bitcoin has a block chain that is from my best representation a list of blocks. I know the block holds many transactions. But i'm still very much lost as to what a block is and how a block can ...
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1answer
42 views

Can a blocksize limit be a sustainable way to introduce scarcity?

Some people feel that it will be important in the future to introduce some scarcity into the mining market by having a block size limit. The idea is that this will force transactors to bid up ...
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3answers
351 views

Why doesn't bitcoin place additional constraints on competing block chain forks, other than length of chain? (e.g., time and confirmation count)

In Bitcoin's proof-of-work system, consensus on which chain of blocks should be considered the "true" block chain is based only(?) on which chain is longer. Accordingly, to quote a nicely written ...
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46 views

In NXT, how long do you have to wait for 1440 blocks to be mined?

I see this referenced in many places with NXT for 1440 blocks. How long is that exactly?
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1answer
56 views

Transactions used to form a block

I've read the Developers Guide ( bitcoin.org/en/developer-guide ), asked a few peers and I still don't understand how the transactions are used to form the block. I did get that the transactions are ...
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1answer
73 views

How Does Network Difficulty Relate to the Odds of Finding a Block?

Right now the network difficulty for mining is 40640955016.576. And, according to blockexplorer.com, the current odds of finding a block for any given hash is ...
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1answer
83 views

Is the block timestamp reliable enough to timestamp the hash of a document?

In using the blockchain to timestamp the hash of a document, so to prove that it existed before a certain time. Is it reliable? Do you think it can stand on court? (IANAL and probably you neither) ...
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1answer
27 views

Can a bitcoin block reward be paid to a multisig address if the transaction is included in the block? [closed]

Can bitcoind or other miners be modified to use a fixed payout address?
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277 views

How often does a block have only one transaction?

I was looking at blocks on blockchain.info, and came across this one with only one transaction in it: (the mining reward one) ...
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In what order do new blocks get processed?

Node A receives a newest block with height h1, which it determines to be valid, and therefore stores the block on disk. A little later, it receives another block with the same height h1 but a greater ...
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1answer
199 views

How to fork an Altcoin Which has 0 Reward Block to continue mining after the LAST POW BLOCK

Im trying to learn how is it possible to Hard Fork an Altcoin Blockchain to Continue the Mining Phase after the LAST POW BLOCK. The Block Reward is already 0 and the LAST POW stops at Block 8000. And ...
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1answer
77 views

Do Miners get a reward for re-confirming blocks?

As far as I know, to ensure double-spending didn't happened and also for other security reasons, there is minimum number of confirmations that a transaction should have to be accepted. That value is ...
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3answers
100 views

When miners are working on their block, does everybody's block have the same transactions in them?

On Bitcoin-Wiki's page about Blocks, it says that "Bitcoin transactions are broadcast to the network by the sender, and all peers trying to solve blocks collect the transaction records and add them to ...
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3answers
126 views

How hard is it to alter a block after it was found?

Once a miner has found a block, how easy it is for him to add or remove a tx included in that very block? Would he have to solve the modified block from the scratch or is there a point he can resume ...
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3answers
176 views

Random numbers using blockchain

How are the block hashes generated? Are they trully 100% random (generated by hardware) or is it pseudo-random (generated by software)? Can i rely on it or any other blockchain data to make a 100% ...
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1answer
109 views

Growth Dependent Block Size Limit

Could the 1MB block size limit be replaced with a growth-dependent limit? From what I have read (here, for example) the 1MB limit is to prevent spamming of the blockchain. And if/when Bitcoin becomes ...
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1answer
27 views

Why do Bitcoin API services offer Block details?

I understand having APIs around addresses and transactions, but I'm less clear why I need to know what's happening with a Block(s). This is to confirm one's transactions? Might someone provide some ...
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1answer
36 views

Can zero-fee txs get into a block?

What happens if a transaction is set to have zero fees? Can it get into a block? Also, if you updated a coin's code to accept zero-fee transactions, would this cause a hardfork? (e.g. made tx's in ...
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1answer
73 views

How could block propagation time be reduced?

This website measures block and transaction time propagation.. At the time of writing, the time required for 90% of surveyed clients to get a block is about twelve seconds. (I just averaged the last ...