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Questions tagged [blocksize]

Collects questions discussing the memory limit of blocks.

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Why do large blocks increase the probability of chain reorgs?

After the recent two chain reorgs taking place in Bitcoin Cash SV, I am finding a number of developers stating that large blocks are the reason for the reorgs: "Almost each time someone is trying to ...
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regarding transaction size in a block

In What are the minimum sizes for transactions and blocks in Bitcoin? The first transaction is set to be 65 bytes long, due to coinbase requirements. What about the second one ? That can be 61 bytes ...
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re : minimum sizes of transactions and blocks

I see there's a similar question provided here: What are the minimum sizes for transactions and blocks in Bitcoin? But the answer provided might be not correct in the light that "A valid transaction ...
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2answers
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What happens if “transaction size” is larger than “maximum block size”?

Assuming a transaction size is T Bytes, while maximum block size is B Bytes, such that T>B. What happens for this transaction? It will be divided into two smaller parts and will be stored in two ...
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Would signature aggregation reduce the largest feasible blocksize

If a Schnorr signature aggregation scheme were to be integrated into Bitcoin. Would the reduction in witness data versus non witness data (need less bytes for a signature therefore witness data usage ...
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1answer
43 views

What is a fee market? Does it mean that blocks should be full, esp. after several halvenings?

As we all know, Bitcoin had experienced an unprecedented long-lasting congestion period in 2017. This seems quite horrible to some people generally, but it seems that such phenomenon was on the ...
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2answers
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Is there any mechanism in Bitcoin that allows it to dynamically adapt to the flow of transactions?

I've read some books and articles on Bitcoin and feel like I've understood many of its concepts but I'm not able to find an answer to a question I've had for a long time: How does the Bitcoin network ...
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1answer
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Why does a larger block size infer a bigger attack vector

I have read this in several articles that larger block sizes makes adversarial attacks easier. What I wonder is why is that so obvious? is it because in a larger block the number of transactions could ...
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How much can you compress a bitcoin for storage?

I've just implanted an NFC chip in my hand and I'm wondering if a bitcoin will fit in the chip. it has a capacity of 868 bytes.
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Why does BIP141 define both virtual transaction size and weight?

Why does BIP 141 (segwit) define both virtual transaction size and weight? Weight seems to be just four times virtual transaction size (or vice versa, depending on what you define first). Why are ...
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Creating lage blocks with multiple transactions in regtest mode?

I want to create blocks with multiple transactions in regtest mode. I want to test propagation with blocks of size 1-2 MB on the dash network. ./dash-cli -regtest -daemon -debug -port=8330 -rpcport=...
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1answer
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What is the current maximum Bitcoin block size in MB?

BIP141 specifies the following: https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki#block-size Block size Blocks are currently limited to 1,000,000 bytes (1MB) total size. We ...
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How are block interval, block size and effective throughput related?

I have two questions: Why does the effective throughput (as defined below) decreases when the block interval is decreased? How does a reduction in the block size results in maintaining a high ...
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3answers
117 views

Can we drive the bitcoin transaction fee arbitrarily close to zero by keep increasing the block size limit?

Can the bitcoin scalability problem be solved in the long run by increasing the block size limit (either dynamically or statically)?
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3answers
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Why is the Litecoin blockchain smaller than the Bitcoin one?

I do not understand why Litecoin's blockchain size is an order of magnitude smaller than Bitcoin's. Indeed according to this link the Bitcoin blockchain requires 196.52 GB and Litecoin's 16.55 GB. In ...
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3answers
5k views

What is the number of transactions in a block?

What determines the number of transactions that can be validated in a block?
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Segwit and block size limit

I'am learning about Bitcoin and I didn't understand something. Maybe someone could clarify. I [think] I understood what Segwit does (increases block size, solves malleability and works better with ...
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2answers
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Wasn't 0-conf more secure than Visa, before blocks got full and RBF was added?

RBF and full blocks make 0-conf useless, because it's easy to override. Wasn't it once useful? I've heard without those it's more secure than Visa in terms of double spending.
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151 views

How and why increasing and decreasing block size will affect transaction fees?

I am reading an article on bitcoin wiki about bitcoin block size https://en.bitcoin.it/wiki/Block_size_limit_controversy and it says that increasing block size will lead to "Bitcoin competitors will ...
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6answers
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can blocks remain capped to 1MB forever?

this is perhaps more of an economics question than a bitcoin question, but i'm wondering if it would be viable to leave the block size capped at 1MB for all time and simply let a series of rules ...
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2answers
1k views

What is block weight and how is it different from block size?

While reading about BIP141, I have encountered the following options: Block creation options: -blockmaxweight=<n> Set maximum BIP141 block weight (default: 3000000) -blockmaxsize=<n> ...
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1answer
109 views

Does Bitcoin Cash validate the fears about larger block sizes?

I read on this forum that a larger block size wouldn't necessarily mean less blocks since blocks are mined every ten minutes, and this is why block size should remain smaller -- Wouldn't a full ...
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1answer
446 views

Why increasing block size increases centralisation?

I understand this is a contentious question. Help me understand Why increasing block size increases the risk of centralization? I don't understand what Antonopoulos meant when he said few people can ...
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183 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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lower bound of block size towards increased speed of propagation

As far as I know there is an upper bound of a block, which is one megabyte, is there a lower bound? It was in terms of a race condition that I was considering this. Imagine you make a double spend ...
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1answer
90 views

Adjustable block size

We know that PoW difficulty is adjusted s.t a block is found roughly in every 10 minute. So, if nodes happen to mine a block too fast, difficulty is increased and vice versa. I wonder if it's ...
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1answer
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Improving transaction handling in shops: Is sending “prepared/approved/signed” transactions to a shop owner possible?

I am quite new to the idea of bitcoin but I have understood one of the main problems: Sending money with Bitcoin takes approximately 10 minutes, by design. For use at the counter in a shop this is ...
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Is there a limit on number of transactions included in a block? [duplicate]

As per my understanding, every transaction is included in a block and the difficulty to find a block gets adjusted such that one block is found for every 10 minutes. Is it the case that all ...
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56 views

Wouldn't a full node use nearly the same space for large or small block sizes?

I keep hearing that a larger block size for Bitcoin increases the network weight for full nodes, i.e. more hard drive space required for full nodes. And hence it would make less full nodes, and so ...
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With 100% segwit transactions, what would be the max number of transaction confirmation possible on a block?

With 100% segwit transactions, what would be the max number of transaction confirmation possible on a block? And, how many utxo can be updated by a block full of segwit transactions?
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388 views

How much will Segwit *actually* increase bitcoin capacity for realistic transactions?

I often see claims that Segwit increases transactions per block by 1.7x to 2x. I'm not sure if this is true, but if I do the math myself, I don't get this number. My understanding is: 1) The “weight”...
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How much will Segwit increase the number of transactions that can fit in each block?

How much weight would the witness data have on the total block size? What is the culminating effect of this on the number of transactions that can fit into each block? Thanks in advance :)
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Minimum transaction fee to COMPLETE when mempool is +50 MB

As of June 11, 2017: Mempool History - < Blockchain.info the mempool is currently about 50 MB, and a week ago, the mempool was about 100 MB. The blocks mined per day are about 150, so at 1 ...
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1 block only allow about 2000 transactions. Does it mean every 10 minutes, bitcoin can allow 2000 transactions?

Hi I very new to bitcoin and don't understand this. Isn't this 2000 too small? I thought there would be more than 10,000 transactions going around every 10 minutes. Especially when there is an ICO ...
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118 views

Is it possible that transactions throughput will grow to beyond what can be synchronized?

The number of users increases, and thus the number of transactions. Is it possible that in the future transactions arise faster than I can sync them?
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What is the weight of a block that contains no pay-to-witness scripts?

I'm trying to understand block weight, a metric introduced by segwit (BIP-141): block weight = 3 * base size + total size "base size" is the length of a pre-segwit block, which contains only ...
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1answer
2k views

What is the maximum transaction throughput of the Bitcoin network?

I have seen different values mentioned but the 3.3--7 transactions/second appears to pop up a lot. In Section 2 of On Scaling Decentralized Blockchains (A Position Paper) it says the following: ...
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Is SegWit a blocksize increase or more efficient use of blockspace?

This question gets asked frequently on reddit, and I think it would be beneficial to have a canonical answer here: Is SegWit a blocksize increase or more efficient use of blockspace?
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Does the 1 MB block size limit include the header?

I was able to follow the code to validation.cpp: // Size limits if (block.vtx.empty() || block.vtx.size() > MAX_BLOCK_BASE_SIZE || ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION | ...
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Why are there always some unconfirmed transactions?

As far as I know, a miner begins creating a new block as soon as it receives a valid block from another miner. It then begins to construct and hash the next block on top of the block it just received ...
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226 views

Why is the network congested?

I'm reading a lot of people saying that is taking around 3/4 days to confirm a transaction. What are the reasons for this being happening?
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Why miners try to produce big blocks i.e. try to put transaction in a block as many as possible?

Why miners try to produce big blocks? What if, does a miner deliberately produce a block with a single transaction (and a coinbase transaction of course) without considering the whole unconfirmed ...
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1answer
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Why some blocks didn't use full potential of their size?

Currently there is 73600 Unconfirmed Transactions. But some blocks has only 749 kB or 0,21 kB or two block in row has 33 and 173 kB. Why this blocks does not have 99x.xx kB? I mean there is a space ...
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Arguments against Bitcoin using adaptive blocksizes

Besides the risk of miners artificially increasing the average block size on purpose, what are some of the potential negatives of adaptive blocksizes? Are there any advantages of human set hard ...
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Cryptocurrency with small block size limit or large block time

So there are a lot of cryptocurrencies that tries to improve on Bitcoin's 1 Mb block size limit and 10 minute block time (6MB per hour) by using faster block times or larger block size limits. For ...
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1answer
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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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1answer
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What is the estimated size of complete blockchain when all bitcoins are mined. i.e around 2140?

By size, I mean how many GBs or TBs of data storage I would need to save entire blockchain starting from Genesis block when all bitcoins are mined?
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Why are mining pools not removing the 250 kb block size soft cap?

I might have misunderstood what is happening, but looking at the block sizes it seems that most mining pools are sticking to the 250 kb soft cap, with BTC Guild being the notable exception. There are ...
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What if some group of people start sending small transactions from wallet to wallet just to make the blockchain bigger?

What if some government start using their computers to move the tiniest amount of Bitcoin possible, from wallet to wallet, just to make the blockchain REALLY big? Is this possible? And also, is it ...
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How big will the block chain become?

How big can the block chain become? It's already 7 GB after a couple years!