Related to Bitcoin Blocks

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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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18 views

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
78 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
48 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
75 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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36 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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26 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 ...
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1answer
30 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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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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35 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
122 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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433 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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57 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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66 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
89 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
103 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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2answers
53 views

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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27 views

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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99 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
90 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
36 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
345 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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2answers
44 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
51 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
72 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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76 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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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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264 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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63 views

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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180 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
73 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
97 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
122 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
162 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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97 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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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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33 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
67 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 ...
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175 views

What are the equations to convert between bits and difficulty?

If we take transaction hash 0000000000000006770c3806960539ca83a24facbd99ea212f37f2a0e6a5629a for example. The difficulty as a 32 bit float is 50810339.04827648. The difficulty in bits as an unsigned ...
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287 views

Must a Block contain a coinbase transaction?

Must a block contain a coinbase transaction? If so, how is this enforced?
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106 views

What shape of merkle tree does the Bitcoin client build?

The Bitcoin client builds a merkle tree to represent the transactions, then includes the root of that tree in the block header. But usually, the number of transactions is not a power of two. When ...
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85 views

How many transactions in One Block?

Block is collection of transactions.Who can decide Number of transactions per block? and How transactions are selected in block? and How does the priority works for fee transactions? Thanks
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46 views

What is the algorithm of block selection using Target Difficulty?

Suppose below is target difficulty: 0x0000CDEF0A000000000000000000000000000000000000000000000000000000 So result value must lower than target to select block. So, If Miner 'A' found: ...
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1answer
74 views

Confirmation limit

When seeing transactions I see that the number of confirmations keeps increasing without any limit. I wanted to know if there is any time limit on including a already confirmed transaction in a block ...
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231 views

What is the block / confirmation time for NXT coin?

what is the block time to get my transaction confirmation? Do i still have to wait 10+ minutes to make sure a double spend didnt happen?
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57 views

What determines how many transactions end up in a given block?

What determines how many transactions end up in a given block? Blocks can have various numbers of transactions, so what decides how many are in a certain block?
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389 views

Custom altcoin won't sync with node and neither will accept a miner connection

I forked the BlackCoin source, changed the ports, generated the genesis block, merkle, blah blah blah. I set up a node on a DigitalOcean server and compiled my coin daemon there as well as on my local ...
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1answer
204 views

Created genesis block and set up node. How to mine?

Everything seems to be going well creating my altcoin for fun. I forked the BlackCoin source on Ubuntu, successfully mined a genesis block, recompiled. I bought a droplet over on digitalocean running ...
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1answer
108 views

Why is my new altcoin trying to connect to peers and sees almost 200k blocks remaining?

I downloaded and forked the Blackcoin source code. I changed all of the references to BlackCoin, changed the pszTimestamp string along with the current Unix timestamp. Then, I successfully mined the ...
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71 views

How to find a block containing a transaction using transaction hash only?

Well, the title says it all. I have a transaction hash and I want to find this transaction in the blockchain. I am working with bitcoinj. I am probably missing something very obvious here, but I ...