Questions tagged [private-blockchain]

Private blockchains are not available for the public and are maintained/secured by a cluster of trusted nodes. These kind of blockchains are useful when dealing with sensitive information.

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121 views

Maximum amount of TX per block

Yesterday we did a test. We launched around 1500 transactions simultaneously to our test private blockchain. They all went through perfectly, all at almost the same time (with correct and consecutive ...
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Gas estimation failed

whenever I want to run this code I get this error "Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending? VM ...
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1answer
143 views

Private network: Using geth to mine for parity nodes

I want to set up a private Ethereum network using a parity client. Ideally, I want to resemble the "real" Ethereum network as close as possible. Thus, I want to set up a proof of work network. For ...
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426 views

Puppeth: No ethstats server configured

Update This is an issue with Docker Compose >= 1.23.0 and I've raised this in the go-ethereum GitHub issues tracker. I'm following this guide to create my own private blockchain using PoA consensus. ...
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1answer
36 views

How to change the crypto-currency that is used in paying for gas fees in a private network

I have deployed my own network of blockchain that is based on the ethereum network. I wanted to know if one could change the currency used to pay for the gas on the private network.
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1answer
89 views

Generating genesis.conf for Clique PoA private network via command line

I'm trying to generate a Clique POA genesis file that specifies the original sealers using automation. However, puppeth only supports user input at the moment. There's no support for command line ...
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57 views

How would ethereum personal accounts helpful?

I have setup ethereum server node and created one test network. started mining, ether is generating in eth.accounts[0]. i have follwoing questions. How multi accounts(eth.accounts[0], eth.accounts[1],...
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519 views

Private Ethereum blockchain: missing trie node

I deployed a private blockchain with the following steps: Setting the difficulty to a fixed value (see Running a “quick” Ethereum private network for experimentation and testing) and creating the ...
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474 views

Please enable network time synchronisation in system settings geth windows 8.1

I'm learning Ethereum and following this tutorial to setup private chain on local machine. All works fine, however when I try to run the node(s) it displaying me an warring Please enable network time ...
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90 views

geth --ethash.dagsondisk 1 - option ignored?

I have configured a private network in which I can assign different roles to different nodes (machines). Before starting the test I generate the DAG for the block number 0 with the command: geth ...
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1answer
309 views

Pending transactions Geth private Blockchain

I have an ethereum consortium blockchain based on Azure (Geth 1.7.3). I've been experimenting with an application which has a very simple smart contract. The contracts itself, stores data that comes ...
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2answers
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Private chain Ethereum handshake failed Genesis block mismatch

I'm setting up a private chain between two VMs. The first node started mining successfully, and the connetion between the two VMs has no problem. But when I try to connect the second node to the ...
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can raiden network be used on ethereum PoA(proof of Authority)?

https://github.com/raiden-network/raiden can raiden network be used on ethereum PoA(proof of Authority) ? If it can , how to use it? Please help.
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completely disable contracts on a private network

I'm running a private network I've forked from Ethereum. I'm wondering if the code is so tightly coupled I won't be able to disable contracts or if I could possibly find a line or 2 of code to take ...
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199 views

Confirming transactions on my own blockchain

I have gone through this guide to create my own Ethereum smart contract on my own private network. I have created my own network, I have a smart contract code ready, I have Mist installed to deploy ...
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664 views

How to Sync Nodes on Private Blockchain

I have created a Private Ethereum Block chain on AWS with two nodes. One is Primary node and another is Miner. Now I deployed the smart contract on primary node. As its a P2P n/w, same smart contract ...
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Private Network - Ethereum Peers not connecting to LXC Containers nodes

We have 4 Computers with LXC containers installed. We have 4 geth instances running on host PCs and 4 geth instances running on LXC containers. My issue is that the nodes on host PCs and LXC ...
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2answers
363 views

Difference between eth.newAccount and personel.newAccount

Can anyone explain the difference between `eth.accounts.create()` and `eth.personal.newAccount()` and which one we should use and why? As I am new to ethereum so its very confusing for me. Thanks
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118 views

How get public address from State Root leaf node (code inside)?

In article "Understanding the ethereum trie"is written that: For the state trie, the keys are ethereum addresses. So i obtain State Trie and in that trie I got Merkle Leaf node: ['9:', ' LEAF ...
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100 views

Help understanding and translating my private network genesis file parameters with config.go variables

I am modifying the file config.go in the geth project for a private blockchain. Here are the config.go variables // MainnetChainConfig is the chain parameters to run a node on the main network. ...
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203 views

What is the physical location of Blockchain?

Hello everyone i am new in this technology and i am confused please clear my few doubts. Thanks in advance. Blockchain consist of Blocks but where these blocks are stored, i mean what is the physical ...
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325 views

Should genesis.json be copied to each node for private testnet?

I am referring to the main page of go-ethereum here. With the genesis state defined in the above JSON file, you'll need to initialize every Geth node with it prior to starting it up to ensure all ...
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140 views

Read function returning blank array in geth

I have deployed a smart contract on geth which has 2 simple read, write functions in it. Then I called the write function; e.g. payment.place_order("Laptop", 10,{from:eth.accounts[0]}). After the ...
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426 views

truffle log location?

Does anyone know where truffle keeps logs? I am unable to perform a migration. It gives me no error message; it just hangs on: Running migration: 1_initial_migration.js Deploying Migrations... ...
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448 views

nat:extip with toml configuration

I'm running the following command to get the toml configuration file: geth --datadir ./chain --nat extip:182.168.1.2 dumpconfig echo > config.toml But when I start get with the config.toml geth -...
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In a private blockchain network, can we delete the first N blocks and reassign the N+1th block as the genesis block?

I am aware of the data loss caused by deleting the first N blocks. But I am curious to know whether such a task is possible or not. If so, how to practically implement it? ( I am using go-ethereum. ...
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116 views

Miner not picking pending transactions from pool when TPS is high

I'm running a private testnet with a high block gas limit and low difficulty. When I start pumping in a large volume of transactions (say 150 tx/s), after a certain point of time, I see the miner ...
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257 views

Synchronisation issue on Mainnet, testnet and private network

I am just unable to synchronise on any kind of network either main network , testnet and not even on private network. I have updated my geth instance to a newer version - Geth/v1.5.9-stable-a07539fb/...
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81 views

Ethereum send transactions are unsuccessful when I run the node and miner in same machine

I have started the Ethereum client using the Go Ethereum. And also started the Ethereum miner on the same machine. Now node and miner are running in the single windows function. If I try to send ...
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177 views

Public-of-chain using proof-of-authority, where authority is defined as the amount of work on your public key

I'm wondering if there would be benefits to create a public blockchain based on the same algorithms used for private, proof-of-authority blockchain, except replacing the concept of authority by the ...
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342 views

Unable to get value of pending transactions on one peer on another peer

I have two nodes (A and B) running as peers on a private network . How can i check if there are pending transactions on one node (suppose Node A ) from node B. Node A has rpc enabled and rpcport is ...
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398 views

Parity with Nodejs - Sending bulk transactions

I'm running a private testnet with Parity, and interacting with it using a nodejs cli. I have a script with which I trigger multiple transactions in quick succession for a smart contract that I have ...
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251 views

Connection between two blockchains

I am looking for an approach to creating a connection between two blockchain-networks. I found out that I can use oracles to get data from extern systems (= second blockchain-network). But how can I ...
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289 views

geth taking a long time to mine a block

I'm using the embark framework to deploy some smart contracts to a private Ethereum network. The problem is, the network behaves differently on separate machines, even though they're similarly spec'd -...
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141 views

Remote Hosts don't recognise all peers on a private ethereum network

We are running geth on Ubuntu in virtualBox on Windows for all hosts. We are all relative NOOBS on this although have successfully set up and transacted remotely already. I have set up private ...
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110 views

GasLimit check failed for header -1 when mining in private chain

On a machine with geth and geth --testnet running I would like to creat a private chain as well. I have created a private chain with the following genesis.json { "name": "hackathon", "engine"...
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389 views

How to initialize private blockchain using flu?

I get the following error when trying to initialize a private bockchain using flu: $ sudo flu console --config ~/ppaconfig.json flu Hinted genesis block's state root hash is incorrect! flu Hinted #...
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25 views

Issue with failing to detect peers via Bootnode on Local Network

I am attempting to connect various nodes to my private blockchain on my local network using a bootnode to discover peers. Connecting the peers on the local machine running the bootnode is possible, ...
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Could not Able to start my genesis block “Fatal: Account unlock with HTTP access is forbidden!”

I am getting some problem while i am trying to mine for my genesis block on my Geth command prompt "Fatal: Account unlock with HTTP access is forbidden!" could anyone please provide me help ...
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BlockNumber stuck on 0 while a private network node is looking for peers

I'm extremely new to Blockchain and mining, and I've followed this tutorial to create my first private blockchain. I am stuck when it comes to mining and I'm afraid I'm quite lost. Afte I've started ...
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45 views

Deploy smart contract to private network

I have been having issues deploing any smart contract to my private network. I'm using geth 1.9.15. Here ALL the steps that I made to get the error: //CustomGenesis.json { "config": { &...
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Mining stops after some time in my Hyperledger-besu Private blockchain

I have been using Hyperledger-Besu's quickstart guide to build my private blockchain (with ibft2 as consensus algorithm) on an AWS instance, which basically just clones that repo https://github.com/...
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1answer
72 views

How to create a token exchange for private blockchain?

I have requirement to create a exchange for my private blockchain tokens, where registered user can buy and sell tokens, and token price goes up and down on demand and supply. I have searched bit, ...
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How to connect 2 nodes without admin.addPeer()?

So, I started 2 nodes on my private net using geth, with custom genesis file, different port numbers, all how it was supposed to be. In one instance I added the admin.nodeInfo.enode of the other ...
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1answer
80 views

How get private key in private network?

I launched a private RPC Blockchain network and connected through another computer to this network. The connection is successful. How can I get a private key(through Python) if the file is on another ...
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1answer
67 views

One contract accessing data from another fails

I am trying to get two contracts to interact: pragma solidity ^0.5.10; contract C2 { address public addr; constructor(address per) public { addr = per; } function ...
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The bootnode is not working properly

I am running a private ethereum network using geth. I started the bootnode first following the documentation and ran 5 different nodes on the same machine with same genesis file on same network with ...
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1answer
186 views

How to call a contract function that alters blockchain state on geth console

It should be easy, but I'm having a hard time using a simple smart contract described in the Solidity language reference called SimpleStorage. It only as one attribute, a setter and a getter, and I'm ...
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21 views

Private Etherum to work like Main Net

I want my private Ethereum blockchain to work like the Main net, I want to fix the number of mined ether (Set Max Cap over minded ether), and don't want that miners earn by mining empty blocks.
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1answer
69 views

Static difficulty in 1.8.27 for local network

I am having trouble getting geth 1.8.27 to have a static difficulty on a private network. I followed the instructions from here. But when I test it, the difficulty still increases. I tried again, ...

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