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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Scalability of private chain with 0 block time

What could be some issues in scalability if a block time of 0 is set to a private ethereum blockchain? If I set it to zero, blocks will only be added to the blockchain every time there's a single ...
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eth.coinbase gives the wallet address which is not exist in the system

I'm facing a strange issue, when I execute eth.coinbase command on Geth, it gives me wallet address which is not present in the key directory. But that isn't in the genesis file I'm not sure how ...
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sending transaction giving an error of “unknown account” after some time interval in Geth

I have review kinda same questions on this site, however, the issue in my case is different hence I'm asking. I have setup three nodes for the private chain, and it's working fine. I can send ...
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Ethereum Wallet(mist) not catching private network in windows 10

I have set these paths but not working C:\Program Files\Ethereum-Wallet and C:\Program Files\Geth I have made a private network using Geth, but when I installed the Ethereum Wallet, it is not ...
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How can two light nodes on a chain communicate individually?

Let's say I have two light nodes on a chain and I want them to exchange data ~3KB without appending anything to the chain. They are not on local network. How can I achieve it?
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Fail Transaction Using Metamask And Create Smart Contract Using Geth Private Blockchain

I have an error when building a private blockchain on my computer. The code that I run is like this (Simply my concept make it without mining and only focus on smart contract): genesis.json file { ...
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How other party can access my contract?

I am running private ethereum blockchain. As we know smart contract is used for agreements between non-trusting parties. Now, I am wondering how the other party can access/see my smart contract? ...
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What is the difference between IPDB and Blockchain Databases?

I wanted to know what are the differences between IPFS, interplanetary file system and a block chain database like IPDB and BigChainDB
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Eth 2.0 Private Chain

Now that Eth 2.0 testnet is in place, do we have a source to create a private chain of Eth2.0, similar to the private chain implementation of Eth 1.0. Any pointers are of great help Regards, Manoj
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uPort with private blockchain, is it free?

If I use uPort for a private blockchain, this means that all the transactions for identity management will be performed in the private network and are free?
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Peer nodes of another server not getting connected in private blockchain

I'm doing setup of a private blockchain using PoA, and facing issue in connectivity with peers of another server. I'm using geth 1.8.16, and created genesis file using puppeth. Structure Server-1 ...
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How to deploy a contract when a private chain start?

ethernet vererion: 1.8.x, language: golang 1.11.x I wrote a smart contract in solidity. The contract's contructor has two parameters like this: uint256 _initialAmount, string _tokenName I ...
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Contract deployment works but method calls fail

I think it has something to do with my start line geth --datadir ~/final --networkid 98763476 --rpcapi "web3,eth,personal,db,net" --rpcport 888 8 --rpcaddr "ip" --rpccorsdomain "*" --rpc --allow-...
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Starting Up tutorials for hyperledger fabric and Caliper Framework

I am new to Hyperledger world. My goal is to set up hyperledger fabric on my machine. Then, setting up a simple smart contract on the blockchain network. Then, using caliper to do measurements such as ...
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Miners are not working when running geth command in background in linux

I am running my private blockchain using geth on my ubuntu server with following cmd then its working fine geth --datadir ~/chaindata/ --networkid 45123 --verbosity 3 --rpc --port 30304 --rpcport ...
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Ethereum in space?

Is there a list of missions that have flown to space that have broadcasted the Ethereum network to ground? I'm interested to know the feasibility of this project and would like to start by surveying ...
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What causes .deployed() to return same contract instances in each test

It took me awhile to diagnose the problem. At first I just noticed that the states of my contracts were being affected by previous tests when running truffle test I then looked in the terminal tab in ...
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How do I unlock the Parity Ethereum Ethash prefunded account?

So i have my ethash node running with the following chainspec.json { "name": "Morden", "engine": { "Ethash": { "params": { "...
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Ethereum network event simulator

I would like to simulate and observe an emergent Ethereum network, so I could draw conclusions about the main net and simulate my own code at the infrastructure level. I am looking for the best tool ...
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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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How to include constructor arguments in bytecode for smart contract deployment in genesis block?

Please excuse if the title is not perfectly accurate but I had a hard time fitting my problem into 1 question. If you have a better title please feel free to suggest it and i will edit it. I want to "...
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Will there be support for admin.removePeer()?

Newest geth version has an admin.removePeer('') function, which I use in my IoT application. How easy is it to fork off web3.py and create a w3.admin.removePeer function? Can someone point me in the ...
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What should be the limit for miner to mine a block

I am trying to run my smart contract in remix ide, below is my smart contract code: pragma solidity >=0.4.17 <0.7.0; pragma experimental ABIEncoderV2; contract Department{ struct Employee{ ...
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Pending transactions at the client machine, but minter is not minting a new block since there are no pending transactions

I am running Blockbench on Quorom Raft using smallbank workload: 4 minters and 4 clients. Following the logs, I found that sometimes 1 specific client (Client 4) has pending transactions but the ...
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Ethereum Peer Removal

Current Geth version supports a removePeer function, which is great. I am working on a IoT application proof of concept using a local ethereum network, and I need to dynamically add and remove peers ...
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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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Azure Blockchain Service node properties [closed]

What exactly are Access key 1, Access key 2, Member account, Web socket, DNS, creater account, etc. of a node in Azure Blockchain Service? I am getting confused as to what are these. Also what are the ...
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What is the block number of the first block mined in a private blockchain network deployed on say Quorum?

I am working on POCs on Azure Blockchain Service. While working on quickstarts, I observed that while deploying my 'Hello Blockchain!' smart contract, the block number of the block mined was 34136. ...
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Truffle test using multiple connections

I am running a test which involves sending transactions to a smart contract from multiple nodes. Right now, I have seperate truffle folders in each node, with a test file that sends the transactions ...
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1answer
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Can I hardcode an enode hex-section in a local network?

I have multiple devices with unique IP's. Is there a way to attribute the same enode hex to all of them (while still having unique IP's contained in the enode).
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Smart contract transaction takes different amounts of gas on different platforms

I have an ERC-20 token contract on which I want to perform some testing on a local chain. I got my chain setup, contract deployment and testing scripts ready on my Windows machine. However, since I ...
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1answer
30 views

how to run a private blockchain network with geth on other machines, such as server and client?

i want to run private blockchain network , on the server I'm running: geth --networkid 4224 --mine --minerthreads 2 --datadir "D:\mydirectory\private-network" --nodiscover --rpc --rpcport "8545" --...
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Unable to get the Ethereum accounts (eth_accounts) using the JSON RPC

I launched an Ethereum installation with the Amazon Blockchain Templates using the simplest installation, the docker-local with a private network (not connected to the public Ethereum network). ...
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Blocks can't contain more than 81 transactions

I'm building a private blockchain with Parity clients. For performance testing, I'm submitting many identical transactions. One of the nodes has a GPU miner attached. There are 2 issues I cannot ...
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41 views

Deployed contract address is getting undefined after few days on private network

I have a private blockchain where I am able to deploy my smart contracts successfully and then I am getting the address of my smart contract which I am storing on my relational db. In geth console ...
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25 views

Geth Providing error on its directory path

I have initilize my node1 with my genesis file which worked fine command is 'geth --datadir node1/ init genesis.json'. But with same geth when I try to run this command geth --datadir node1/ --...
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Setting a value for ERC20 token on private blockchain?

Background: Currently we have an Dapp running on Ropsten. We've created an ERC20 token on Ropsten. Our employees are awarded these tokens over time. We want to use Dappos to allow our employees to ...
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What is the max number of Blocks which can be created in Quorum

I have nodes running from past few days, with almost 4100+ transactions successfully completed. When i try to interact with the contracts again to add/modify details it shows error Error when ...
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Geth automining does not fill blocks to maximum

I am running a throughput test on a private geth blockchain. The test sends 500 transactions rapidly and then waits for their confirmations in order to measure transactions per second. However, I've ...
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41 views

Calling provable_query via Ethereum-bridge work only the first time

I implemented a contract to call a api via provable and ethereum-bridge on a private ethereum. In the first time, when calling a api, it works fine. However, when tring to call api again, I got an ...
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Quorum private transactions not private

I am struggling to enforce privacy using Quorum's privateFor option. I have provisioned a consortium in Azure blockchian service with 3 nodes. I deploy a smart contract from node2 privateFor node1 ...
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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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Add Two peer from two different machine into one machine

I have created three node on three different machines. I have used same genesis file for all three nodes. Here is my screenshots of nodes Node-1 Similarly, I have set up two more node on two ...
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2answers
53 views

Measuring deployment time of a group of transactions in a heavy load testing

I am currently trying to perform heavy load testing on a ERC20 token. My plan is to use truffle to test stuff like how long it would take for 500 transfer transactions to be deployed (on a private ...
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1answer
135 views

how to build Dapp for Android using react-native

I have a ethereum Dapp for web application and have metamask extension installed in my chrome browser to make transactions. Now i want the same application to be developed in android using react-...
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How to reduce block time for existing ethreum blockchain network?

I had deployed my private blockchain network back in 2018-08-12 16:12:48 +0600 (1 year, 167 days ago). Since then it is working. At that time the block time was 20-30 seconds which was acceptable for ...
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Private Blockchain Chain Spec Sanity Check Please

A private blockchain running for two years runs find on Parity 2.3.9. When upgrading a node to 2.4, sync stops. Peers are still strong (25) but block import repeats at Block X where Block X is the ...
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Unable to change/read local variable in a smart contract on a local private geth blockchain

I trying to create and test an ERC-20 Token on a local geth blockchain. I tried compiling and testing my contract on Remix's Javascript VM environment and it works fine. Then, I wanted to try ...
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How is authorization handled in smart contracts

I have deployed a Quorum network on Azure Block chain service to be used by specific invited members of a consortium. I have not yet explored the privacy features provided by Quorum on top of Ethereum....

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