Questions tagged [blocks]
This tag is for questions dealing with the structure of blocks.
226
questions
2
votes
1answer
15 views
When MetaMask removes the Cancel button for a transaction?
When I start a transaction, MetaMask shows it with Cancel button.
When does this Cancel button disappear? Maybe after one confirmation? After N (what is N?) confirmations?
0
votes
1answer
15 views
Uniquely identifying and lexicographically sorting transactions
Is event.blockNumber + '-' + event.logIndex unique for an Ethereum transaction (that is no two different transactions having it the same)?
If not, is event.blockNumber + '-' + event.logIndex + event....
0
votes
1answer
23 views
Solo block verification
If I have one block from bitcoin blockchain. I can check that block is valid without having the previous blocks. (solo block verification)
Imagine I have one block from Ethereum blokchain. Can I check ...
1
vote
0answers
15 views
is “newBlockHeaders” in web3 emits a legit block?
I'm using web3.eth.subscribe('newBlockHeaders') to track transaction I sent to the blockchain. My question is that is the block emitted from "newBlockHeaders" legit or in other words, the block has ...
1
vote
0answers
16 views
Block number as part of header rationale
It seems to me that block number is something that can be derived correctly by a node locally (from the parent block relationship). What was the purpose of including it in block header -> making it a ...
0
votes
1answer
21 views
Blockhash Minus-256 Problem [duplicate]
What is meant by Blockhash Minus-256 Problem?
I am reading an article at:
Bad Randomness
It talks about Blockhash Minus-256 problem but does not explain much about it. As a result I can’t ...
0
votes
1answer
42 views
Blockhash: Register the block number
I am reading the following article from a website:
bad randomness
In the context of Blockhash the author says:
For instance, a good protocol (formulating a random trial as a “bet”)
is the following:
...
2
votes
1answer
30 views
What is meant by on-chain randomness? What is the difference between on-chain and off-chain operations in the context of randomness?
I want to understand on-chain and off-chain operations in the context of randomness. Kindly provide me an example so that its clear to me.
I got one post here:
What are offchain and onchain ...
6
votes
1answer
614 views
How to retrieve ERC20 from a hacked address monitored by a bot?
Check it out: https://discordapp.com/channels/554623348622098432/633092550407749652/714325610050355260
The address that was hacked: https://etherscan.io/address/...
1
vote
1answer
35 views
Spending funds before the block is mined
Suppose I have an application that receives funds from users and instantly moves them into an associated cold storage account.
If one of our nodes detects a transaction broadcast to one of our ...
0
votes
1answer
28 views
web3.eth.getBlock isn't triggered
Basically, i want get the callback result of first method to get each index value in pass it to the second method to scan this value, in this case is an ethereum transaction to get the input value. ...
0
votes
0answers
17 views
What’s the transaction ordering inside a block? [duplicate]
The game
I found a game where each gambler needs to pay 0.02 ᴇᴛʜ to register a secret before the game before the games switch to status==reveal each day.
Then, during the status==reveal period no ...
2
votes
0answers
34 views
When is a “shard block” cross-linked into a “finalized beacon block”?
In Ethereum 2.0, a shard block for being finalized needs to be linked into a finalized beacon block.
Under which conditions a "shard block" cross-linked into a "finalized beacon block"?
Having 2/3 of ...
2
votes
1answer
35 views
What's the difference between a Slot and a Block?
I'm running a private beacon chain with the Lighthouse client with some local validators:
Mar 23 10:35:08.281 INFO Block from local validator block_slot: 13009, block_root: 0x2bab…25a6, ...
2
votes
1answer
47 views
What if a malicious validator denies to sign a new block in a shard committee in Ethereum 2.0?
In Ethereum 2.0 (Sharding Blockchain), a new block requires to be signed by all the validators as members of a committee, where blockchain has been sharded in smaller parts for supporting parallel ...
1
vote
1answer
38 views
What is the block number of the first block mined in a private blockchain network deployed on say Quorum?
I am working on POCs on Azure Blockchain Service. While working on quickstarts, I observed that while deploying my 'Hello Blockchain!' smart contract, the block number of the block mined was 34136. ...
4
votes
1answer
69 views
How transactions are selected by the miners?
The deployment of transaction executions is bounded by the block gas limit that changes dynamically. If a block fits only one transaction, then the gas limit per transaction is, in theory, the same as ...
3
votes
0answers
37 views
Blocks can't contain more than 81 transactions
I'm building a private blockchain with Parity clients. For performance testing, I'm submitting many identical transactions. One of the nodes has a GPU miner attached. There are 2 issues I cannot ...
1
vote
1answer
24 views
What is the max number of Blocks which can be created in Quorum
I have nodes running from past few days, with almost 4100+ transactions successfully completed. When i try to interact with the contracts again to add/modify details it shows error
Error when ...
3
votes
2answers
73 views
How does Ethereum prevents a node from mining a block with tempered transaction?
My question is rather simple, and I found this question in the Bitcoin StackExchange that somehow relates to mine, although, for the Bitcoin Blockchain, which I'm not sure if Ethereum solves the ...
0
votes
2answers
42 views
Can anybody here help me in understanding how transactions and block is getting verified [closed]
Please help me in understanding how transactions are getting verified and also how blocks are getting verified before appending it to the canonical chain.
0
votes
1answer
28 views
Integrity of old blocks in the blockchain
I am learning Ethereum using Geth, and I am testing PoA-Clique networks. Now I have a conceptual doubt about old blocks integrity. Suppose I have a private blockchain network of only one miner node ...
0
votes
1answer
46 views
Multiple GasLimits on my Private Ethereum network?
I am wondering if it is available to make multiple gas limit block in one of my private networks. The multiple gas limits blocks in a private network means that size 10, 100, 1000 and so on, those are ...
1
vote
0answers
20 views
What happens if in the genesis file, I put something different than 0(0x0) for the “number” property?
From what I have understood, the number property from the genesis file represents the block number (to match block structure). So, logically, it should be 0x0 because the genesis file is the first ...
1
vote
1answer
69 views
Private Clique network, where can I get block sealer and block reward?
Private blockchain
PoA validation algorithm
Using geth attach MY-GETH-CLIENT, I want to check the sealer of a block as well as its reward.
Using eth.getBlock(BLOCK-NUMBER), the miner field is ...
0
votes
1answer
33 views
Is Ethereum block header a list?
Decoding a RLP encoded block using Eth specifications do we get header as list? But as per format i.e., [[blockHeader,transactionList,uncleList],totalDifficulty], blockHeader should have been string.
...
2
votes
1answer
41 views
4.3.1. Transaction Receipt-Yellow Paper
I am trying to understand the following function which appears in section 4.3.1 of the Ethereum Yellow Paper:
The function description state it "prepares" a transaction receipt, does it mean that the ...
0
votes
1answer
35 views
Writing string to separate block in Ethereum
Is it possible to take input of a string from client side and using smart contract write that string data to a new block inside the Ethereum blockchain mainet or any testnet?
Basically take in ...
1
vote
1answer
35 views
Are there block rewards for ETH2 validators during Phase0
ETH2 is rolling out in multiple phases. The first phase (typically called phase 0) is the minimal beacon chain. Does this chain already include block rewards? If not, what's the incentive to stake ETH ...
2
votes
1answer
80 views
How to calculate average time it takes for a transaction to be added to Ethereum blockchain?
In the following article (LINK) we read:
"despite the fact that at the time of this writing a new block is
produced approximately every 10–20 seconds the average time it
actually takes for a ...
1
vote
1answer
46 views
Web3: can last block be replaced?
I'm using web3py's getBlock function to get the latest block. I am right now caching the latest 50 blocks so that I reduce the amount of workload in my geth node, and to improve overall speed in my ...
0
votes
1answer
111 views
How do Miner choose transactions for a block?
i am wondering how a Miner chooses the transactions, he want to mine inside a block.
For example, a Miner has got the Transactions T1 and T2 at the moment he starts a new mining work. This Miner is ...
2
votes
1answer
47 views
Can the block number be set back in ganache?
I know about tools like ganache-time-traveler that let you advance the block number.
But is it possible to go back to a lower value?
0
votes
1answer
24 views
In ethereum network how data structured and is every data stored, is public?
Let's say, 3 companies are using ethereum network.
Company A
Company B
Company C
Company A put some data, block01 and block02. So ethereum network looks like,
Genesis Block -> block01 -> block02
...
0
votes
2answers
33 views
Does a transaction that consumes the block gas limit take an entire block by itself?
Does a transaction that requires the entire block gas limit to be executed (currently ~8M) take the entire block by itself?
And if that's true, will that transaction take longer to get confirmed than ...
0
votes
1answer
27 views
Can I rely on certain oracle to know the precise and reliable timestamp?
I am learning the security impact of smart contract on system properties like block.timestamp and block.number. I understood that block.timestamp can be controlled by the miner to certain degree and ...
1
vote
1answer
39 views
“The bigger the block size, the greater the computational power needed to mine a block” Does this make sense?
I was going through one of the papers and the authors in the paper mentioned this statement. I am not able to find the correlation as such.
I do understand that Larger blocks may propagate slower ...
0
votes
0answers
21 views
Mining pool assign blocks
I've been researching mining pools to figure out how they assign work to miners. I understand that pool would get a job from the blockchain they only has a header, dag, difficulity, probably block ...
3
votes
2answers
1k views
Avoid using “now”
I am using "now" to save the block timestamp details. But there is a warning to avoid its usage. If we need to avoid it what is the best alternative to it.
1
vote
1answer
45 views
Are transactions to EOA included in a block guaranteed to be successful?
Regardless of the source of the transaction (externally owned address / smart contract) and the data included within the transaction, if the destination is an EOA and the transaction was included in a ...
2
votes
1answer
47 views
Are transactions with zero data included within a block guaranteed to be successful?
I know there are transaction receipts to verify that a transaction included in a block was executed successfully and funds were actually transferred.
But can receipt verification be skipped if I'm ...
0
votes
1answer
12 views
How to get blocks from which an adress has taken coins&
I need to undeerstand how to find out from which blocks come coins that are currently stored at somee adress.Will be pleased to hear any suggestions.
3
votes
2answers
242 views
What is the difference between account nonce and block nonce?
Block and accounts both use a value called "nonce" but they seem to represent something very different.
For account I understand that the nonce is an integer quantity indicating the number of ...
4
votes
1answer
123 views
Timestamp in Ethereum
I have a smart contract where the user inputs temperature readings, I'd like to add a time stamp to relate those reading with a current time of submission. I understand that in Ethereum we only have ...
0
votes
1answer
62 views
How to calculate average gas price of several blocks?
I want to calculate average gas price of several blocks (in Gwei), however I don't see how a field on blocks for gasPrice. Do I have to calculate it by grabbing the gasPrice of each transaction in ...
0
votes
1answer
49 views
Is there any library to estimate timestamp of future block?
I am in need of a library that estimates a date or some sort of timestamp when fed with a future block number (on mainnet or any major testnet).
For instance, https://etherscan.io/block/countdown/...
0
votes
0answers
21 views
Parity synced at not existing block 4839212
I have problem with parity, cant get synchronization in archive mode to end,
anything, changing arguments, max-, min-, snapshot-peers, parity verisions do not help.
I have blockchain in archive mode ...
0
votes
0answers
56 views
Is latest block returned by eth.getBlockNumber fully processed
According to web3 docs, web3.eth.getBlockNumber returns the number of the most recent block.
My question is simple.
Is it safe to assume block's transactions and events are already in the node or ...
1
vote
1answer
40 views
Fetching block template from node
The most famous opensource pool uses eth_getBlockByNumber method with parameter "pending" to get block template and generate jobs from it. But now, in parity, I found that this parameter is deprecated ...
1
vote
3answers
388 views
Increase block number on Ganache
How can we increase block.number on Ganache for testing purpose ?
If not possible do you know an alternative like passing X fake transactions to artificially increase block.number.
Or if we have to ...
