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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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geth node on ubuntu setup question

To run a node on my vps, 1.--rpccorsdomain "mydomain.com" and set maxconnection, can be set at the same time so that only my own website can send rpc call for security, also I use max connection to ...
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running node on a different server

Is it possible to run eth node geth on a different server. That means not on the same server of my web When I run the geth what should I pay attention? Whether I need to use rpccrossdomain etc? How ...
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Node is showing up as a Peer in Ethstats

I am experimenting which Blockchains in a private environment. I have created two nodes and they are showing up just fine in the ethstats page. One is local on my pc, the other one is also local but ...
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How do other nodes handle the accounts of a deleted node?

In Ethereum Blockchain, the accounts created on one node stay with it and are not replicated into other nodes. If that node is deleted and hence is not a part of that network, then what happen to the ...
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“Invalid JSON RPC response” using web3.getPastEvent

I am using web3js to query a remote geth node (Geth/v1.8.14-unstable-35fcd2f4/linux-amd64/go1.10.3) for a particular event Ping emitted by a smart contract. myinstance = new web3.eth.Contract(myABI, ...
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What are the differences between running a light node and connecting through the metamask server package?

What are the differences and what has to be considered to decide which approach to take? What are the benefits and disadvantages of running a full node, instead of one of those two approaches? By ...
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36 views

Which Ethereum clients support running a full node?

Are there any other Ethereum clients besides for Geth and Parity which support running a full node?
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33 views

Running a full node of ETH

I need to run a full node of ETH and its bound tokens for an experimental exchange site. How will I do to differentiate ETH from others tokens ? Is there a way to download the ETH blockchain ...
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How does geth communicate with other nodes to sync ?

Evening if all ports are closed geth can still sync with other nodes, what channels exactly are used for that ?
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“being full node” vs.“being sync” : Are they the same?

When we try to be sync using Parity or geth, Does it mean that we are trying to be a full node ? And is it correct to say that: being sync = being a full node = keeping the entire blockchain ?
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86 views

How to prepare VPS enviroment for instalation and running of Ambrosus node?

I would like to run Ambrosus development node. On Ambrosus github there are sume instructions, but I do not know how to prepare enviroment, what version of Ubuntu I should use and what tools should I ...
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How does a node handle smart contracts during sync?

I was thinking to set up an Ethereum full node, but have some questions I can’t find the answers to. Does my node have to execute every smart contract that was put in the blockchain over the past ...
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Hard vs Soft Hierarchical Address Derivation

I'm using parity as node/JSONRPC and I'm generating a HD wallet with it. Basically I have one address and, according to the Parity documentation, I can generate a new address with this command: ...
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25 views

How does an Ethereum node understand that 51% confirmations have been obtained?

In a private Ethereum setup: How does a node that computed the nonce understand that 51% of the nodes have confirmed the mining? Is there some kind of a counter maintained which shows number of ...
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eth.blockNumber does not match any network's current block

I set up a geth full node on Rinkeby with the following command: /usr/bin/geth --syncmode fast --nousb --cache 3072 --trie-cache-gens 1024 --rpc --rpcaddr 127.0.0.1 --rpcport 8545 --networkid 4 2>&...
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Is it possible to get account balances in --syncmode “fast”?

I want to get transaction details and account balance from Ethereum blockchain. The range of date is from genesis block to last mined. Is it possible to get these information from web3.js? Is it ...
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Unknown addresses on txpool on a full node

I just connected to our full node and after inspecting the txpool saw random addresses. I just wonder if someone is connecting to our node or if the transactions I'm seeing are from light clients. ...
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34 views

How do the other nodes know which particular node has the account used in the transaction?

A brief about my setup. I am using a private Ethereum network with 3 nodes. I have made all the nodes as peers of each other by using: admin.addPeer("enode:1234abcd..") When mining takes place, all ...
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How to generate Ethereum wallets & keys on serverside with JS?

Anybody knows, how can ether wallets be generated on serverside (node.js). It's needed for service, to create a new wallets for new customers. Maybe something like bitcoinJS-lib but for ethereum? But ...
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high availability ethereum node for web3 1.x beta

Infura doesn't cut it for me, it randomly times out for the level of requests I would like to me Are there hosted high availability ethereum nodes? Any recommendations welcome (Running my own isn't ...
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Bridge to a Node - Web3

In my site I call a contract's method that returns me a value, using web3, and then I show the value on screen. Obviously, if you go on my site you must have installed an ethereum node or a bridge to ...
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Is there any fee charged by QuikNode? [closed]

Is there any fee other than network fee that QuikNode charge while creating a new account or sending a new transaction? Also, is it on production network or testnet?
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47 views

Does running a Geth RPC server locally also require having a full Ethereum node?

I've been trying to learn about smart contracts and attempting to work through a few examples. Specifically, I found this one about creating an Oracle -- https://github.com/axic/tinyoracle. The ...
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Update Parity Node Installation

I have 3 nodes, all in Ubuntu 16.04 that I have to upgrade. To install the node, I downloaded the latest stable version from https://www.parity.io/ and then did: wget wget [LINK_FROM_PARITY] sudo ...
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46 views

Deploying Ethereum template on AWS?

I would like to deploy an Ethereum template (the one provided on aws website : https://docs.aws.amazon.com/blockchain-templates/latest/developerguide/blockchain-templates-ethereum.html) in a private ...
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Any way to get test ether from rinkedby without downloading an entire node?

I'm trying to learn about smart contracts. As part of a tutorial I was told to use the "rinkeby" network so I could get some test ether. Using this tutorial -- https://gist.github.com/cryptogoth/...
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128 views

How to connect not local node to private Blockchain?

Is there any way to connect NOT LOCAL node to running private Blockchain? So, there are 3 virtual machines in one local network. They are syncronized private blockchain. They have static-nodes.json ...
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What are the ramifications of changing `--port` in geth?

If I'm running a full node with --lightserv enabled for several hundred clients, what are the ramifications of me running geth on a port other than 30303? If I change it to --port 2345 will I still be ...
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48 views

Raspberry Pi Geth node: Unable to apt-get update and install packages (404)

what's up? I've recently started running an Ethereum node (Geth) on a Raspberry Pi 2 following the tutorials provided by Ethembedded.com. They provide a Raspi2/3 Geth (Go Ethereum) 1.4.10 image. It'...
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What is the best OS to run an Ethereum node on?

It was recommended that running your own node is beneficial for learning as well as for the network and community. Is there any reason to use one OS over another for running an Ethereum node? I ...
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1answer
79 views

how get to nonce that need to send in ethereum transaction?

I have written down node js code to send eth using web3. I am getting nonce value using getTransactionCount which is working fine but as all know it can not count pending transaction so if i send ...
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61 views

How do I connect to MY full node using RPC

I have a full node(Parity) running at home. I know I can trust this node. How would I go about connecting to it from another computer?
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Why is that the 'blocks count' is always in multiples of 192?

I'm running light node client for rinkeby using command: geth --rinkeby --syncmode=light --rpc --rpcapi personal,db,net,eth,web3 The terminal runs continuously and I don't quit it when I close the ...
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How does Ethereum handle undeterministic results from oracles?

Since when a transaction is done, every node in the blockchain runs the smart contract in their machines, what if the smart contract is calling an oracle to get a random value? Shouldn't it return ...
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What happens when transaction is sent from smart contract?

If during smart contract execution it decides to send a transaction, then transaction would be created, validated and broadcasted to the network from all the nodes executing this smart contract. ...
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How would I query my full node locally from code?

If I have a full node already running on a cloud service, and I open up a go file for example. How would I query my own, without allowing other lightweight nodes to connect and query it too? My node ...
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geth node pending transactions

Not really sure what information you need.. I am running geth with the following command: /usr/bin/geth --datadir /mnt/ethereum --fast --nousb --cache 4096 --trie-cache-gens 1024 --rpc --rpcaddr 0.0....
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Ethereum blockchain node & block terminology

I was studying about the basic blockchain terminology and got confused the point of node & block. In some links, both seem similar whereas in some both explained differently. I don't exactly know ...
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How to access an account if node is down

Consider a following scenario for a multi node private blockchain network: If one node is down, how can I access accounts created on that node from another node without having private key of the ...
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How to unlock account from another node in same blockchain network?

I have deployed DAPP on two node private ethereum blockchain network. According to this question it is not possible to access all accounts across multiple nodes. My question is consider a scenario ...
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Swarm node crashes when uploading big files

I noticed that when I try to upload files which size are around 100KB or higher to swarm, my node crashes with the following message: "panic: runtime error: slice bounds out of range goroutine 27181 ...
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23 views

How to check sync status of ethereum light node? [duplicate]

I'm running a Ethereum light node, I want to set up my website to accept ethereum, but I don't want to download the entire 250gb+ blockchain. After installing Ethereum, I ran geth --light. This is ...
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50 views

How many peers can an Ethereum node have?

Is there any maximum limit on the number of peers an Ethereum node can have? Does this vary for private and public networks? In case of Bitcoin, is there a limit?
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59 views

Unable to deploy smart conrtact using node js (not truffle)

here is the code as explained in web3 doc(node:13887) web3.eth.estimateGas({data: '0x' + bytecode}).then(value=>{ console.log('gasEstimate = ' + value); let MyContract = new web3.eth.Contract(...
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Transaction's initial node

Initially, transaction is created in some local node and is in its local pool. Then it propogates to other nodes. So, is it possible to know, what node was transaction initially created by?
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1answer
33 views

Add new sealers in aura network without hard-fork?

I've set up a private PoA (aura) network using parity-deploy and was wondering how it's possible to add/remove authorised nodes without doing a hard-fork of the network. I've heard about people ...
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How to get node to notify of transactions?

I just finished syncing my Ethereum node. I'd like to set up a way my node can run a bash script or trigger something to run a PHP script every time someone interacts with a contract. Node Detects ...
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Ethereum light node: Light vs Cache vs fastsync

There are many different options when running a Ethereum node. I want to make sure I pick the right options before I start downloading the blockchain... can someone explain the advantages of using: —...
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Error: Couldn't decode uint256 from ABI: 0x

I'm aware this is a duplicate, but the other never got authoritative answers and this is a simpler demonstration of the problem. I created this Contract: https://etherscan.io/address/...
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How to run pruned node?

This is my first time dealing with Ethereum nodes. With other coins, such as bitcoin, we have the option to "prune nodes" which allows us to only store the newest blocks to save space and resources. ...