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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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Image and file storage in block chain

Is it possible to store a base64 image code as string in block chain? I know we can use IPFS or Swarm as a tool to store an image or a document, but if someone gets to know about the hash anyone can ...
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How to gather all addresses of nodes in a private network?

I am currently learning core-development in go-ethereum. I am a little weak with networking, RPC and connections. I am trying to write a function in my own consensus mechanism that gathers all ...
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How can I (efficiently) programatically see if I am on an ETH or ETC chain?

if i have 2 nodes, one ETH and one ETC, and I am writing a program to use these nodes, how can i determine which node I am using at any given time? the best i can come up with is to check a known ...
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how do I know which node picks up my transaction? in general, how is a node assigned to broadcast a specific transaction?

How do I know what node is broadcasting my transaction to the network? how can i get more information about this node? for example, how do i know if the node is a geth or parity node? does it matter?
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ethereum node hetzner packet back to getway error

I try to run ethereum node on hetzner windows10 virtual machine (based on my esxi delicated server) but every time hetzner block that vitual machine ip cuse of this error We have noticed that your ...
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What possibly could go wrong if I leave my private blockchain node 30303 port open to public? [duplicate]

I have the following setup: All the nodes inside my cluster are talking to each other via 30303 port. When I want to talk to them, I'm using a Geth light client via HTTP JSON RPC port 8545. Only the ...
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Techniques to count nodes [duplicate]

What are the different techniques to count nodes in ethereum? ethernodes.org has a count of nodes, how can we verify if that is true ? Are there any other techniques to do similar counting. Can you ...
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Detecting nodes by an identity in Ethereum network?

According to this answer: (https://bitcoin.stackexchange.com/a/63657/41513) the following can be definition of a node: "A node is a computer that has a copy of the blockchain (or at least a part ...
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creating multiple nodes in private block chain

this is the command used for creating my first node:geth --rpc --networkid 1114 --rpcport "8545" --port "30303" --rpcaddr "0.0.0.0" --nodiscover --ipcdisable --rpccorsdomain "*" --datadir ./myDataDir ...
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Two Ethereum Node (connected to private net) on Single PC: Node data write error .Synchronisation failed [duplicate]

Is it possible to create 2 geth instance on single PC? Both are connected the private blockchain? When I connect a node to the private blockchain,it must sync with the blockchain by downloading all ...
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No etherbase set and no accounts found as default

I am getting: "No etherbase set and no accounts found as default" when trying to sync my node using: geth --testnet --rpc --rpcapi db,eth,net,web3,personal --cache=1024 --rpcport 8545 --rpcaddr 127....
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Parity speed limitations

I have a question about the node limitation for mainnet. I want to send a lot of transactions at the same time (let's say 1k), on the ropsten network it queues every tx and send batches of 64 every 10 ...
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28 views

How can nodes fail

I am writing plans to support a parity blockchain cluster and need to determine guidelines for the DevOps team. What are the ways in which nodes can fail and back practice for handling these?
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“RPC error, your account is locked” when I try to deploy the last version of parity-bridge

I have already success to deploy the last version of parity-bridge (last month), but today i have pull the last version of parity-bridge. I have that on my terminal : env RUST_LOG=info parity-bridge-...
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What is best deployment practice for block-chain nodes?

What is the best practice for the deployment of block-chain/peers node? Is it best to have all the node in single cloud server or it should be decentralized and co-located on different server at ...
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eth_getTransactionReceipt returns null only sometimes and only on my node, tx is successfully mined in

I'm having this strange problem and it may be related to the way my node is configured. I'm making calls to both infura and my own nodes like so: {'id': 123, 'jsonrpc': '2.0', 'method': '...
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Getting the latest eth_call result from a cluster of nodes

What's the best way to know the block number associated with the result of an eth_call? Assume I have several nodes that i'm running and i'm making calls to all of them (for redundancy). My goal is ...
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“Elkrem:” Does it install an Ethereum client on a micro-controller?

I have read this article which describes the prototype of Ethkrem, a development board for IOT and Ethereum: https://devpost.com/software/elkrem-development-board-for-iot-ethereum . However, it is ...
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'curl: no URL specified!' Installing Parity on AWS (Ubuntu)

The accepted answer found here does not seem to work for me: https://ethereum.stackexchange.com/a/46926/11266 I created an EC2 instance of Ubuntu 16.04 LTS (HVM) $ bash <(curl https://get.parity....
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AWS full node requirements and querying transactions

I would like to work with the Ethereum blockchain and be able to get transactions associated with an address. I believe I cannot use the fast sync mode and need to have a fully valditating node? Do ...
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Unable to Add 3rd Proof-of-Authority Sealer Node

I have a geth POA private blockchain setup and running with 2 sealer nodes. Now I have setup a 3rd node as a sealer, and ran the following command on the both existing sealer nodes clique.propose("...
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geth node on ubuntu setup question

To run a node on my vps, --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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102 views

Which Ethereum clients support running a full node? [duplicate]

Are there any other Ethereum clients besides for Geth and Parity which support running a full node?
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234 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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289 views

“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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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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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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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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255 views

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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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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100 views

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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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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217 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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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'...