Questions tagged [nodes]

A node is a machine which is running an Ethereum client. It synchronises the blockchain with other nodes in the network, so that they all have the same definitive copy. A node is needed to send and receive ether and to executive DApps.

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Private Ethereum Node is unable to add peers

My genesis file (used same for both nodes) "config": { "chainId": 42, "homesteadBlock": 0, "eip150Block": 0, "eip150Hash": "...
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Geth error: flag provided but not defined

Geth version Geth Version: 1.10.20-stable Git Commit: 8f2416a89a3def6ec2c749d5afafbf2c9a18e3c8 Architecture: amd64 Go Version: go1.18.1 Operating System: linux GOPATH= GOROOT=go Error: flag ...
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Create a wallet with ethereum node

If I install the ethereum node on the server, I can create a wallet through it. Now, if I send a transaction from this wallet, do I still have to pay the fee? In the past, someone told me that if you ...
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What is the start point of a Transaction in Ethereum blockchain?

As I learned so far, every node in network, has the address of other nodes and they can communicate with each other regarding mining new blocks, but what about the Wallets? What will happen exactly ...
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Getting issue while installing @ethereum-alarm-clock/cli

Ran Command : npm i -g @ethereum-alarm-clock/cli Issue received below : I am able to install other packages though, Is there something i need to do? while npm i -g @ethereum-alarm-clock/lib , I got
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Geth switching from full sync to snap sync

trying full sync with a Samsung T5 2 TB USB on a linux VM running on VMWare Workstation The full sync stopped responding at one point, so i force exited it and then restarted with the same command as ...
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how blocks are selected during the process of IBD

From what I understand during the Initial Blockchain Download we are connecting with other peers and download blocks which they are sharing with us. Two things comes to my mind. First - are we ...
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How to tell if my node is a full node given an rpc endpoint?

As I understand it, there are 3 types of nodes: full archive light How can I tell which node I'm connected to given an RPC URL?
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How do node providers (e.g. Infura, Alchemy) determine gas pricing on contract writes?

When writing to a smart contract, we can specify the priority and fee per gas. await contract.connect(owner).foo({ maxFeePerGas: "<YOUR FEE>" maxPriorityFeePerGas: "<YOUR ...
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Does calling a read function with input leave any trace?

I want to call a read function which does a calculation and returns a result. It is important that the input will not be saved on the blockchain. If I were to use a write function then even if there ...
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What if I as a miner , include some wrong transactions in the block and push it . What is the process so that other nodes get notified about it?

Also give tips to sail easily through the ethereum yellow paper
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Why does Ethereum state storage cost more than history storage?

According to this spreadsheet that Vitalik has referenced before, stating that it's what they used to determine gas fees for each opcode, state storage costs around 190 gas per byte while history ...
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"geth attach server" fails with 401 but fine with `ethclient.Dial(server)` in GoLang

I want to trace transaction with debug.traceTransaction() in geth, I'm using free archive node from "moralis.io", the url looks like "https://speedy-nodes-nyc.moralis.io/...my_key.../...
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Bsc full node setup

I have followed all the steps correctly in setting up.. BSC node... from the Guide on quicknode.com But keep getting this error "Snapshot extension registration failed" "peer connected ...
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BSC bot stops buying tokens after some time

I made a mostly profitable bot using node.js buying and selling shitcoins on BSC. However, sometimes the bot just stops buying. I use web3 to find relevant mined transactions (this part always works) ...
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Does an Ethereum Node need to be accessible from the internet?

Suppose I want an Ethereum/BSC node running on my network using GETH. I want to be able to access the node and run any sort of API calls against via Web3 from a locally running software. The node has ...
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Can Blockchain technology be really descentralized while using centralized ISP?

There are 15 tier 1 network providers. As I see it the vast majority of internet traffic passes through one of these 15 providers. Since a node has to connect to its peers through one of these ...
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How does blocks get copied from peer to peer?

Suppose a block is accepted and validated at a node in a blockchain at a particular gas fees...... so during the process of coping the block to the other nodes of the blockchain network, can it be ...
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Why are local reads so slow?

Why is it so slow to read data from the blockchain? Even if you use a local node, reading is slow. Consider for example the following contract: contract Test { bytes3[100] private largeArray; ...
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Block chain beginner questions

I am new to this Block Chain environment and this is not an excuse for asking this basic doubt its just that I am very curious about this question and I am not able to find any answer to this question....
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What are the Node Providers for Avalanche Network

Is there any node providers for Avalanche network so that I can get realtime data from blockchain? I have tried Moralis and Graph, but they have 5-10 seconds lagging behind the blockchain. So I need ...
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Patricia Merkle trie and LevelDB in each block

I have a few questions regarding Ethereum's modified Patricia Merkle trie and LevelDB. Does each block only contain the root hash of all the tries (World State, transaction, and receipt) or the ...
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How can i find a ommer block using web3js

Hello i try to learn web3js to get data for my project. What i need is to find ommer block. My idea is I will connect to 4-5 nodes in different regions(via node provider) and save the highest block ...
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How does a node know the consensus and reconcile the differences?

There are a lot of similar questions like this, but I could not find satisfactory answers specific to my questions. 1.Purely from a single node's perspective, how does it know that the block it ...
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I want to run Uniswap, Pancakeswap, Kyber nodes in my local machine

Instead of polling prices across multiple exchanges, I would like to run each of these nodes locally and fetch them in real time on a smaller machine like Rasberry Pi. I'm trying to find the best way ...
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How does a new node register in the network? [duplicate]

I am just trying to get into the topic of Etherium and Blockchain and currently I do not understand the following. Etherium network is decentralized p2p network. But if I start a node, the network ...
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What's the ancient folder in Geth?

I'm new to the nodes world and i'm trying to setup my own with Geth on Windows. I was wondering what the /ancient folder does for the Node. Please correct if i'm wrong, but synthetically this is what ...
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Simulating a transaction's state change without writing to the blockchain

I'm trying to simulate a transaction to observe the state change and events that will be emitted, before sending the transaction to the blockchain. I'm interested in all the internal calls and state ...
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Switching from Full to Fast Syncmode in Geth

I have been syncing my node for about 3 days now and am only at 39%. I assume part of that is my internet speed, and specs. However, I am wondering if I can pause geth, switch the service to use --...
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How does ethernodes.org discover nodes?

I am running my light-client at the moment and wanted to know, how does ethernodes.org discover nodes? And is it possible to get discovered using a light node? Thanks in advance!
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Is it possible to verify a node is running remotely?

I am trying to run many different nodes remotely and I was asking if it were possible to verify they are running remotely. Is it possible to verify a running Geth-node remotely? Thanks!
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The Ethereum node gives an error and writes off all funds

Colleagues, hello! Help me understand and solve the problem with the ether node. We execute a request in our node with the following code eth.sendTransaction ({from: '...
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Benefits of using Light Nodes, if you already have a Archive / Full node at your disposal?

I might have asked this question in the question i posted yesterday, but i realized that this would be better off as a separate question. So assume you have a really powerful PC/Server Machine (let's ...
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Are pure functions and events verifiable/guaranteed

I am very new to solidity so please forgive me if I'm mistaken, but it seems that pure and view functions are not really run on chain if I access them with web3 (but they are if I access within a ...
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When we say that a 51% control of total computation power could lead to a successful Sybil attack, do we refer to miners or nodes?

As per my understanding of the blockchain so far (Bitcoin and Ethereum) nodes and miners have different jobs to do in a blockchain network. Although the terms are extensively used interchangeably, ...
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How to use NodeReal's Meganode service in BSC Testnet?

This question seems even a bit stupid to me, but I read in Binance documentation about Nodereal, and they state in their documentation about Meganode service, the following: Supports mainnet and ...
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How does a smart contract "run on a blockchain" under-the-hood?

I'm quite new to the blockchain technology and I would like to understand a few concepts for which I couldn't find an in-depth explanation online. All the resources I examined so far explain the ...
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Question: Multiple Node connection, primary purpose to keep a full node in sync

Goal: Build a Full Ethereum and BSC node, deploy other full nodes in different geo-locations with the primary purpose to feed the Main full node with the fastest and up to >second data. Reasoning: ...
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Getting a could not detect network error when I try to connect to a Hardhat node which is connected to Alchemy

I have set up my project following these guides (in order): https://hardhat.org/getting-started/#overview (the installation part) https://docs.uniswap.org/sdk/guides/using-ethers (the first steps ...
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Does a geth light node verify transactions before sending them on chain?

I have a geth light node running locally , i used to use alchemy but now i use geth, however i noticed alchemy json rpc fails and doesnt submit the transaction when something is wrong , whereas my ...
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Send transaction from accounts of different node

I am running a private blockchain using geth. I have 3 nodes A,B and C and each node has its accounts. So if I connect via RPC to node A. when I send a trasnaction from nodeA_user 1 to nodea user 2 it ...
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bsc node fast sync : diff layers too new from current

I'm trying to do a fast resync of my node running on a 36gb ram, Ryzen 9, nvme ssd. But now i have an error but can't find anything on it... ERROR[10-28|11:29:47.644] diff layers too new from current ...
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I am trying to addLiquidity on Uniswap v2 but I am getting error Reason provided by the contract: "TransferHelper: TRANSFER_FROM_FAILED"

function addLiquidity( address tokenA, address tokenB, uint amountADesired, uint amountBDesired, uint amountAMin, uint amountBMin, address to, uint deadline ) external ...
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Can GETH run quickly and be always up-to-date with an AWS c5 instance?

I've noticed that most people who are using AWS to run their ethereum node are using the i3 (or i3en) instance type for its high I/O performance with the attached SSD. For my particular use case, I ...
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Connecting Metamask to local geth node RPC only works on Chrome but not Firefox

I'm trying to connect to my local geth node RPC from my Metamask in Firefox, but it always gives the following error under the "Chain ID" field: Could not fetch chain ID. Is your RPC URL ...
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chainlink request to cancelChainlinkRequest

I have been on this to test how requests will be canceled. i go this error the has of the transaction here: https://testnet.bscscan.com/tx/...
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Is Chiliz a sidechain? How to get transactions from it?

Suppose I want information about some ERC20 token. I run Ethereum mainnet node of my preference, load all events of ERC20 token of my interest with eth_getLogs, and do whatever I want with that info. ...
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What if all nodes dissapear?

I know this may be a dumb question... And I know this is a very unlikely scenario... but I want to know. What if all the nodes from ethereum network dissapear? The transactions would stop being ...
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How to edit minium link payment as a node-operator

Been running a node, and I notice the payment in configuration settings is not editable, how do I figure that out, also am not seeing the Oracle balance in link increase and it debiting the user using ...
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Running chainlink node on google cloud and accessing the node server as an operator

I was able to access the localhost:6688 when I was running the node server, so whenever I closed the console the server will go down, so I decided to detach it by installing sleep now the server is up ...
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