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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Transaction submits but is not valid when processed

I'm running two scripts that try to solve the same proof of work problem. from web3 import Web3 import json from hexbytes import HexBytes import numpy as np import os import time INFURA_ROPSTEN_URL ...
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Connect to any ethereum node remotely

Is it possible to connect to any synced ethereum node remotely and query their blockchain? Also, if the former is possible then are there any known remote nodes that offer this functionality for free? ...
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what kind of node I need

I want to use ethereum php lib and I need to set a node in the script to replace 127.0.0.1 and port 8545. What kind of node I use min space and min ram so it will save me money to set the node up Use ...
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What is the difference for parity and geth node [duplicate]

I try to find a php lib but most of them can only used with a geth node How can I get a free node to use that support send transaction and calling send erc20?
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Eth node quiknode and infura question

For infura node, whether the API support send transaction or support sending ERC20 token(this is calling contract actually)? supprt creating accounts also? For Quiknode, whether the API will support ...
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Accessing Ethereum network via JSON RPC from wallet balance/transactions

sorry if the question is silly.... I am tying to build a simple app that checks ETH wallet addresses balances and transactions (for both ETH and Tokens). As far as my knowledge goes, I think that I ...
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Modern Parity flags for faster sync? Compute instance won't catch up

I am using Parity 2.7.2 on a virgin compute instance (32gb RAM, SSD, fast internet, 6 cores), and after the snapshots were downloaded and it gets to the blocks, it is about 33,000 blocks behind. I ...
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Connect to a public node with web3js

Is it possible to connect the nodes that are listed on ethernodes.org I chose one of the listed nodes and try to connect with web3 but I get connection not open on send() error. const Web3 = require(...
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Does Hyperledger Besu support Plasma?

Does the Besu client support Plasma? I guess this question could also be asked about other clients such as Geth and Parity as well.
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Transactions stuck in pending state on a geth node

I have a private network of a geth and a few parity nodes. I use the geth node to submit transactions via RPC. A mining pool runs on one of the parity nodes. That node is connected to the geth node ...
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What happened if a Ethereum client do not have one event?

Reading this question, I understand that as long as you have the blockchain then you have all the events/logs. But if a dapp is reading data from a light Ethereum client, how will this light client ...
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How to fight against a cheating node?

As far as I know, there are roughly two kinds of contract calls on Ethereum. One kind is intended to change the global state of blockchain (i.e. change some storage values or transfer money). The ...
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Best Discovery Protocol implementation

Do you guys know an easy Discovery Protocol implementation that is not deprecated and is powerful enough. I've checked some, but all of them are not suitable for my task (reasons below). Checked ...
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My parity node constantly gets requests from 0x0

I ran my parity node (stable version) with this command on a docker: /bin/parity --chain=kovan \ --jsonrpc-interface all \ --jsonrpc-hosts all \ --light \ --force-sealing \ --auto-update=all \ --min-...
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Multiple nodes setup in Quorum Network

Is there any documentation to state how can we have redundant nodes configured in Quorum network so that even if a single node goes down, the data in blockchain is still retrievable by the app? ...
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Who confirms Ropsten and Rinkeby transactions?

Basic or more like "fundamental" question I guess: So if I got that right, each time someone runs Geth/Parity or other software they all become part of the EVM (ethereum virtual machine). However ...
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How can I find reliable Ropsten nodes for adding to my nodes whitelist?

After the recent hard-fork on Ropsten we follow the tip on peter_szilagyi tweet to add a peer whitelist. In case we want to add more nodes to our whitelist as in Connect to static nodes. where can I ...
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If I'll remove the peer whitelist that I've added after Ropsten hard-fork split while longest chain exists, how the node react?

After Istanbul Ropsten hard fork split, I followed whitelist tip - https://twitter.com/peter_szilagyi/status/1178634327518781441. How a node will react in case I'll remove the whitelist while the ...
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Hidding IP address behind sentry nodes

I would like to know how to set up an Ethereum node behind sentries (proxy nodes). I know there are several ways to approach this issue as mentioned here. https://medium.com/@kidinamoto/tech-choices-...
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Does staking on ETH 2.0 require a full node and how much space would that take?

I read that ETH 2.0 staking with 32 ETH requires users running a full node on their server. But doesn't a full node take up 500+ GB of space? What are the proposed system requirements?
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Why use nodepools or backends?

I have a fundamental question about eth/blockchain infrastructure. I see several posts talking about the need for backend node infrastructure when launching a dapp/ smart contract. This infrastructure ...
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ethereum node to setup with min space

i want to setup an ethereum node for my website to use. What is the min space I need? To save space do I need to use light node? Or even Better idea? How much space I need for light node or full node? ...
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How permanent is data stored in Ethereum?

Does it all depend on the availability of nodes? What if say there's 1 node left in Ethereum, will that node contains the entire blockchain?
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fail for read ethereum node base on leveldb.py

I installed leveldb base on python3.6.but when I using leveldb.LevelDB import path for files to be read. a error occered "leveldb.LevelDBError: Corruption: 3 missing files; e.g.: D:/downloads_by_geth/...
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Is it possible to use address you don't own while running ethereum RPC node (using geth)?

In other words, you start your own node and then somehow add accounts you don't own (aka - you don't have their private keys)? I'm asking because I wanted to make my own node exposed via RPC/...
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One smart contract deployed on 2 nodes will have same address?

Let's get creation of a smart contract address out of the way: The address for an Ethereum contract is deterministically computed from the address of its creator (sender) and how many transactions ...
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How to run 2 nodes simultaneously?

I created a Node 0 and exited before creating Node 1. Then I created Node 1. And using Admin API, I connected Node 1 to Node 0. Node 1 is up and running. How do I start Node 0 and sync it with Node 1?...
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Multiple Accounts on a single node?

I am a beginner and learning Ethereum. Can somebody please tell me if my understanding is correct? Q) There could be just 1 node running, but multiple accounts?
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Why can’t light nodes broadcast transactions directly?

Everything I’ve read about Ethereum thus far seems to state that light nodes are incapable of broadcasting/relaying/etc. transactions themselves. It is also my understanding that light nodes have ...
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Parity version while running

I'm running a Parity node in a docker container. I've installed it with docker pull parity/parity:stable some time ago. How can I know which version of Parity I'm running? (without stopping the node)....
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How does Geth query the blockchain?

This question has probably been already answered somewhere else but I didn't find anything on the internet so I'm asking here. I wonder how clients such as Geth query the blockchain to get specific ...
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How to get rid of inactive nodes in Geth

I am setting up a quorum network with Quorum-maker, which uses Geth. It is running at the moment, with three alive nodes. However, earlier I had attempted to create two other nodes, which failed. I ...
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How to programmatically check the type of Ethereum node/backend that I'm connected to using Go?

I'm aware that I can do this using CURL like so: curl -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"web3_clientVersion","params":[],"id":67}' https://the-node-ip-...
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Nodes from private network don't gossip

I have three Ethereum nodes created with Geth. Two of them are on my machine (MacOS) and the third one is running on a virtual machine with Ubuntu. Because I used the same genesis.json and also the ...
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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 ...
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Decrease the time between new blocks in Ethereum Development

I'm trying to create a DAPP (with docker-compose) which will require many transactions, and I am currently experiencing nonce problems with my Transaction Manager. However, I'm not looking for help ...
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What is the --force-sealing option in the parity for

Can someone please explain what the --force-sealing option is for? From the description I don't understand exactly what it's doing. I want to understand why it must be set if I want to get a pending ...
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Does nodes have maximum limit of transactions

Does geth/parity nodes have a maximum limit of transactions that they can have (in queue) after which they stop accepting transactions (or apply back pressure or something)
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Copy Geth full node onto external drive then continue syncing

My 1TB internal SSD on my mac doesn't appear to be enough for a full sync with state data. I know I can fast sync but I need full state data. I'm currently on block 5.2million and its at around 900GB ...
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How do I monitor 50k addresses for incoming ERC20 transactions?

I have a list of 50.000 Ethereum addresses which at any time may receive ERC20 transfers. I know I can create filters but I don't think it scales to send 50.000 RPC calls to an Ethereum node every 20 ...
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Can't catchup with Mainnet

16GB Linux, 512 GB SSD, mainly started for RPC purposes only. No mining activity. geth --datadir ./data --syncmode fast console --rpc --rpcport 8545 --rpcaddr "0.0.0.0" --rpccorsdomain "*" --rpcapi "...
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How do I list the running nodes with geth?

Is there a way to list the all nodes on my computer with geth command line, and maybe even see some status for them? (I'm new to go-ethereum, apologies if this is a noob question, but I cannot quite ...
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Different synchronization types

What are the different synchronization types for an Ethereum node? Which of them are client-specific (Geth, Parity)?
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Peers not syncing on PoA private network

I've got a private network with two PoA geth nodes, with each node running on a separate machine. One node has been running for some time (in instamine mode) and has mined 6909 blocks. I've just setup ...
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Is there any concern for the significant number of nodes being hosted on AWS/ cloud providers?

Just curious if there is any downside that many nodes are being hosted on cloud providers? For example Infura, which supports many nodes and provides a large portion of connections to Ethereum nodes, ...
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Geth losing transactions

I have a couple of applications running on an Ethereum Blockchain hosted on a VM. For some reason, every now and then, I find my VM rebooted... so my blockchain is turned off... There's no problem ...
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270 views

How to run geth for ropsten and mainnet in a same server?

Is it possible to run geth for ropsten and mainnet in a same server if I changed all the port for Ropsten node trying not to conflict the ports used in mainnet? For example, geth --rpcport 8546 --...
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Does a string message increase the gas usage of a `require` statement?

In solc 0.4.22 onward, it is possible to provide a string message containing details about the error that will be passed back to the caller (in require, assert and revert statements). Does the gas ...
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What is the username / node ID in an enode URL?

Looking at https://github.com/ethereum/wiki/wiki/enode-url-format and https://github.com/ethereum/go-ethereum/wiki/Connecting-to-the-network I can see that the enode URL includes some information ...
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How to mine a Empty Block or reject transaction?

How Can a miner can mine a empty block,reject honest transactions to be added into block ; does it mean we could tweak the miner client , if yes could someone tell how it is done and what are the ...

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