Related to Bitcoin Blocks

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7
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2answers
1k views

Who mined the infamous block 364422?

Block 364422 contains a transaction that takes a long time to verify. This transaction design demonstrates a way a denial of service attack could be executed. This prompted Gavin Andresen to propose ...
1
vote
1answer
18 views

How to add coinbase transaction with libblkmaker

I currently trying to develop a simple Bitcoin miner in c++ for a project on my university. For parsing the 'getblocktemplate'-data I'm using libblkmaker. Now I have to build the coinbase transaction ...
1
vote
2answers
61 views

How to run a full node: Am I already doing so?

I ´ve succesfully installed bitcoind and bitcoin-cli. I got some questions about it: I run bitcoind in the background by typing: bitcoind -daemon and block chain begins to download: by typing ...
2
votes
1answer
44 views

If Bitcoin time value is 4 bytes, is that Unix time from 1970?

I assume that when January 19, 2038 rolls around, there will be a plan for extending the time to more than four bytes. or is it the case that the four bytes are not UNIX time, or do not begin in ...
2
votes
3answers
44 views

how do nodes verify that a block has been solved and can be added to the blockchain

when a miner solves a block it gets sent out to the network, when other nodes receive it, how do they verify that the block received was indeed solved and can be added to the blockchain. So you don't ...
3
votes
2answers
56 views

Why are coinbase transaction outputs greater than reward?

If the sum of the coinbase transaction's outputs must be less than or equal to the current reward (25 btc currently), why in practice do blocks have a slightly higher coinbase transaction output (for ...
2
votes
0answers
21 views

What are the various block size increase proposals? [duplicate]

I'm aware of BIP101 and BIP100, but I'm sure there are others. I would like a simple table of comparison on the block size increase schedule of each one (including the status quo) in one place.
1
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0answers
41 views

What block version is this: d9b4bef9 (decimal: 3652501241)?

I'm trying to parse the blockchain directly from the .dat files. The parser works well up until I run into these blocks, with the version appearing as "d9b4bef9" (already reversed). What is this ...
4
votes
1answer
67 views

Mining for nil-transaction blocks only - gaming the incentive scheme by rogue miners / consortium?

I understand that there is incentive to include transactions where the output is less than the input so that the block creator can pocket the difference. But I'm wondering if that is really worthwhile ...
2
votes
0answers
26 views

Why do transactions get verified before it is clear that the block header is valid?

When I researched for the answer on What happens in detail, when Bitcoin Core verifies a block during synchronization?, I noticed something: According to the Wiki-Entry on Protocol rules some of the ...
4
votes
3answers
324 views

Can a Bitcoin block be less than 1mb?

Can a Bitcoin block be less than 1mb? To my understanding, a miner receives broadcasts. However, if not enough transactions come in, then would it just prematurely hash the block?
3
votes
2answers
273 views

How many blocks are there in blockchain as of today?

I have currently downloaded 300,000 blocks and the last one is generated 1 year and 19 weeks ago. I wonder how many blocks are more to go, before I am up to date.
4
votes
1answer
46 views

Why is CheckBlock called twice when processing a new block?

Once the Bitcoin node receives a message with a new block, it calls the ProcessNewBlock function: else if (strCommand == "block" && !fImporting && !fReindex) // Ignore blocks ...
3
votes
1answer
72 views

In Proof-of-Stake, can a block creator fudge the block hash?

In Proof-of-Work, a block hash is costly to manipulate (say, wanting the hash to be even, or have the hash of the hash smaller than some number) since there is a lot of computing power put into ...
3
votes
2answers
279 views

What is the genesis block?

What is the genesis block? In which ways is it important or different from other blocks?
1
vote
0answers
128 views

(Bither) how can i send my bitcoins?

i downloaded Bither as my virtual wallet and added bitcoins in a Hot Wallet Address. But when i try to send bitcoins, i can't. i fill the address, the amount of bitcoins and i type my password but ...
0
votes
0answers
24 views

Does not process blocks at all, stack on 0

I got this problem couple days ago: Catching up...Processed 0 of 375438 (estimated blocks)....Last generated block was generated 350 weeks ago. Qt version 4.8.4. Used to load very long time until ...
1
vote
0answers
14 views

Node Operators Reward [duplicate]

Why don't we implement a Node Operator reward program (in the core) or if such implementation ever existed what would be the overall (Downside,Cause for concern, etc) Why don't we use the Miner Fee ...
6
votes
1answer
65 views

What happens in detail, when Bitcoin Core verifies a block during synchronization?

Since version 0.10.x, block headers are acquired separately, and therefore download is not delayed until previous blocks have been verified. Previous questions about synchronization mention that the ...
2
votes
2answers
111 views

How can a block be considered more difficult to solve/hash than another one?

In this answer: http://bitcoin.stackexchange.com/a/760/28219 It is said: Because of all this work, when a Bitcoin client signs on to the network it can trust the block chain that was most ...
2
votes
2answers
102 views

When does a miner decide to stop collecting transactions and start calculating hashes to try to win?

I am confused about whether a miner chooses to wait for more transactions (more fees) or starts as soon as it receives the first transaction from the network. Once a miner has started calculating the ...
4
votes
1answer
31 views

Would an increased blocksize lower the stress of the stress tests?

I see that there are about 9000 unconfirmed transactions right now and that five of the last six blocks are under 1/2 Mb and 15 blocks in a row under 750 Kb. This suggests to me that larger block ...
2
votes
0answers
44 views

Get as many blocks as possible (stale, invalid, orphans)

I would like to download (and access) as much blocks as possible - including stale (extinct) blocks, orphans blocks and invalid blocks. I have 0.11 official client. My node is already synchronized but ...
1
vote
1answer
44 views

Shabal256 code explanation

Can anyone please explain the code below with comments? What are pbegin & pend ? What is ( I believe it is data, where it comes from ?): (pbegin == pend ? pblank : static_cast<const ...
1
vote
1answer
38 views

Why aren't block solutions sent to a multicast address?

In computer networking, multicast (one-to-many or many-to-many distribution) is group communication where information is addressed to a group of destination computers simultaneously. I think the ...
1
vote
1answer
72 views

Continuous integration setup using bitcoind regtest on travis-ci

Subtitle: travis-ci fails to run generate JSON-RPC method on regtest I'm trying to setup CI process on https://travis-ci.org platform to install bitcoind and start new blockchain using regtest mode. ...
2
votes
0answers
13 views

Transaction ordering when one transaction redeems another within a block [duplicate]

Say we have txA and txB, and txB contains an input that redeems an output from txA. In order for a block containing both txA and txB to be valid, is it necessary that txB be after txA in the list of ...
2
votes
1answer
97 views

Can Bitcoin Days Destroyed be a better resolution mechanism for competing blocks?

I've been looking at selfish mining and empty blocks. In all cases, the selfish miner profits by keeping block solutions private until their value to his own pool is maximized, rather than releasing ...
1
vote
1answer
73 views

Could increasing Block size solve the “End of mining” issue

Disclaimer: I am new to this forum and Bitcoin/cryptocurrency in general. After all 21 million bitcoins are released into circulation, it seems that the incentive to mine is gone unless transaction ...
2
votes
1answer
31 views

How can one extract an address balance at a specific height?

Is it possible to view the balance of an address at a specific height, without using any external web api? Could it perhaps be done using bx or the Bitcoin client API?
3
votes
2answers
124 views

Are blocks sent only after finding nonce?

One of the concerns with increasing the block size is that it may get orphaned more often due to network latency in sending the big block. Why can't miners send the block without the nonce as soon as ...
2
votes
2answers
129 views

Sending funds on same block of received funds. Confirm sending not received?

My question in quite conceptual: For creating a raw transaction, I just need the txid from the older transaction and the address to send it. Put the funds, the change, what's left is the fee. Sign it ...
3
votes
1answer
97 views

What happens to price when the block reward is gone completely?

What will happen, specifically to the price of Bitcoin and transaction fees when the block reward drops to a negligible amount? Today, each block reward is approximately worth 25 * $300 = $7,500. To ...
0
votes
3answers
162 views

How to monitor the blockchain for new blocks

I want to scan new transactions as they are added to the block chain. Does anyone have a suggestion on how to do this. Are there any APIs that allow for this? Or is there a way to directly tap into ...
2
votes
4answers
116 views

How can I get the DateTime of when bitcoind last received a block?

Is there a command to get the DateTime of when bitcoind last received a block?
0
votes
1answer
109 views

What is the mechanism of determining the transactions of a new block

I am newbie in the Bitcoin field. I have read about the transactions, blocks, blockchain and other materials. As I know, when a new valid block is found and announced by a user, other users start ...
0
votes
0answers
61 views

why to use blocknotify script, even if we can check for “share is block candidate” using target compare?

i have some complicate situation in altcoin wallet that wallet shows new block found with reward , but pool not show block found. could it be a reason that i not use block notify script. but checking ...
1
vote
1answer
96 views

Block Broadcasting - Unsolicited Block Push

Can someone, please, direct me to the source code section(s) relevant for an Unsolicited Block Push as described in the Bitcoin Developer Guide? I've been going through main.cpp and searched for the ...
0
votes
1answer
67 views

Amount of block locator hashes in “getblocks” message

How many block locator hashes are sent in a getblocks message? And how distant are these locator hashes from one another?
6
votes
2answers
124 views

Who makes the decision about blocksize?

I have been running a full node for little less than a year and I am following the discussion around blocksize increase. I am for it. Who actually can make a decision whether the blocksize increase ...
2
votes
1answer
61 views

Why bigger blocks will bring bigger memory usage for miners?

I see the different proposals for the block size and I keep wondering why bigger blocks means a bigger chain ? If the block limit size will rise to twenty-megabyte, it is just a limit, to fill it it ...
2
votes
2answers
101 views

What can a dishonest node do (or try to do)?

Except this kind of attacks: https://en.bitcoin.it/wiki/Double-spending For example can he simply create a new block that includes some invented transactions that steal money from real address? ...
2
votes
2answers
40 views

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 :/
0
votes
1answer
83 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 ...
0
votes
0answers
57 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 ...
0
votes
2answers
28 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 ...
1
vote
0answers
38 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.
3
votes
2answers
277 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 ...
10
votes
2answers
947 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?
-1
votes
2answers
160 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 ...