Questions tagged [blocks]
This tag is for questions dealing with the structure of blocks.
242
questions
0
votes
1answer
11 views
ROPSTEN: Duplicate Blocks adding transactions using Geth Real-Time Event API
I'm using the Geth Real-Time Event to get the new blocks via web-socket and there's a subscription called "newHeads" for that propose.
The thing is sometimes the socket returns a duplicate ...
0
votes
1answer
11 views
How to handle forks, dropped/reverted blocks
I'm building an ethereum wallet, I've setup geth.
I'm planning to subscribe to new transactions on geth websocket, I can't figure out how to deal with dropped blocks and hardfork. let's say a user ...
0
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0answers
44 views
Can a single transaction use up all the block gas limit?
The current Ethereum block gas limit is ~12M,
I see 100+ transactions are added per block on average.
My question is can a single transaction
use up all the Block gas limit (~12M) or miners will ...
0
votes
1answer
20 views
How are difficulty of finding a proof of work dynamically regulated without a central body? [duplicate]
The probability of a miners to mine a block dynamically changes so that blocks are mined at regular intervals.How does block chains accomplish this without a central regulating body,
1
vote
1answer
78 views
Ethereum block timestamp
Is the timestamp of a block referring to the time that block is created or when it's mined by a miner?
Suppose I subscribe to new incoming blocks using the following NodeJS code (with web3):
web3.eth....
0
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0answers
27 views
is it possible to change block' gas limit?
I'm trying to execute some heavy transactions. Before execute it, Remix advises me about the gas limit:
Ok, then I change my gas limit on Metamask to 9,000,000 (I'm on Ropsten network):
And finally, ...
1
vote
1answer
27 views
Failed mined transactions
Is transaction "status" flagged inside the block when it's mined?
Like if a transaction is mined but failed due to out of gas or not meeting contract conditions, is the transaction marked as ...
1
vote
1answer
151 views
Ropsten “exceeds block gas limit”
I am on GETH, 1.9.23 and I have had a smart contract running for more than 3 months now.
Suddenly, all transaction failed with "exceeds block gas limit".
I checked the Ropsten Testnet and ...
1
vote
1answer
24 views
where is receipt tree stored?
Simple question.
I know that state trie is stored in each node's drive. but they are not stored on actual state.
Question 1) What about receipt tree ? do they get stored separately too from the chain ...
0
votes
1answer
24 views
in which currency does state trie's balance is stored?
My question is very simple and I couldn't find the answer for it.
There's a state trie in ethereum. Each state trie has address as key and value as an object which has balance as one of the keys.
I am ...
0
votes
0answers
81 views
Truffle - multiple transactions per block
i try to simulate a large transaction load and therefore want to execute multiple transactions in a truffle test. I changed the block-time to five seconds and generate the transactions, but only one ...
0
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0answers
8 views
How to read the Ethereum Block header and check contract
I have downloaded some Ethereum block headers, such is one example (omitted some details for conciseness):
{"difficulty": 7314508281338, "extraData": "...
0
votes
1answer
25 views
Is Ethereum blockchain really temper proof or immutable?
Suppose there is a user A which transfers some ethers to user B through a proper transaction.
So is it possible to alter the transaction. Something like going back to the block which contains the ...
0
votes
1answer
8 views
Cost at block number
Is their any API available that gets me the price of Eth in USD for example at a particular blocknumber?
1
vote
1answer
36 views
A way to capture actual gas used per transaction
Two questions, related:
Is the getGasUsed() on the TransactionReceipt truly the actual gas used, not the gasLimit or the gas estimate? Looks like it but...
Is the actual gas used obtainable ("...
1
vote
0answers
22 views
Generating blocks without mining,
I have private test network, and I need to simulate forks. Is any possibility to immediately set number block fork-1 (in PoA or any other protocol) ? If yes, what is the easiest way to do it ??
1
vote
1answer
23 views
State Changes within a Block
I read somewhere that the 'state' is only updated at the end of each block. I've also read that each block contains a specific sequence of transactions, and thus implicitly 'updates' the state within ...
2
votes
1answer
67 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
21 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
30 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
23 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
33 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 canāt ...
0
votes
1answer
69 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 ābetā)
is the following:
...
2
votes
2answers
88 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 ...
7
votes
1answer
754 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
40 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
52 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
22 views
Whatās the transaction ordering inside a block? [duplicate]
The game
I found a game where each gambler needs to pay 0.02 į“į“Ź to register a secret before the game before the games switch to status==reveal each day.
Then, during the status==reveal period no ...
3
votes
0answers
49 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 ...
3
votes
1answer
91 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: 0x2babā¦25a6, ...
2
votes
1answer
56 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
40 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
117 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
39 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
28 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
199 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
44 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
38 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
62 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
21 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
132 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
45 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
45 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
49 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
50 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
286 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 10ā20 seconds the average time it
actually takes for a ...
1
vote
1answer
65 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
322 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 ...
3
votes
1answer
105 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?
