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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Transaction included in block whereas log not generated

When I sent a transaction continuously below 27 Transaction Per Second (TPS) then all transaction is included in a block and generated the log as expected. Whereas When TPS increases above 27 then ...
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Transaction sent from web3 cannot reached all transaction to network node

I used one node endpoint to interact with the network. While sending a transaction from web3.js 0.20 to ethereum network, transaction per second (TPS) I achieved is only 28 TPS. I have configured the ...
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Smart contract will not deploy to my private blockchain when using Remix IDE

So I'm a complete newbie and trying to deploy my first smart contract to a local Ethereum blockchain. I'm doing this on a Windows machine. I have created a private blockchain using geth, made an ...
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Changing chain specification

We have a private network with 10 nodes actually. It's been working for a couple months now. When we did it, we set up some parameters in the chain specification that are now too small for the growth ...
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Ethereum Enterprise Blockchain

I am starting a project that I need to build a solution to track products (ex: from farm until it gets to the supermarket) Basically, I need to set up a blockchain structure for my company(private) ...
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Change name “Ethereum”, “ETH” etc. of a private chain

I'm trying to run a private chain with geth and all works properly, but how can I change the name of "Ethereum" and "ETH" and choose a new name and a new TAG? Thank you.
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How feasible it to combine Proof of Work and Proof of Elapsed time consensus to create a custom blockchain?

I wonder if it feasible to create your own custom consensus by combining Proof of Work and Proof of Elapsed time? How would I approach it? Any tools or frameworks to build it? I appreciate all the ...
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Delay on receiving block by peered node

Sometimes it takes an around of 25ms to import new block by the other peered node after mined by miner. But sometimes it increases directly around 400ms to import block by peered node after mined by ...
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110 views

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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173 views

I have question about private block chain gas structure

I have a basic question about gas price charged for transaction. Say I have a private ethereum block chain with ten nodes and I don't want to charge any fee for the transaction taking place in this ...
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42 views

Geth and Private Blockchain Mining

I am trying to set up a private blockchain for the first time with a Geth client. After initializing my custom genesis json file, running the networkid in the console and setting up a couple of ...
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119 views

I have connected two notes using bootnode in ethereum private blockchain but mining is not started why?

I have generated the enode from Bootnode in Ethereum private network and i connected three individual nodes using that enode through Bootnode, and i have checked whether that nodes are connected or ...
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simulation or performance evaluation with Ethereum testnet

I was if you could help me about simulation. How can I simulate the performance of my following IoT-based Application with Ethereum testnet? In my senario,there are some nodes that store sensor data ...
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133 views

How to create private chain in trinity / py-evm?

I am doing academic research using ethereum and want to use trinity / py-evm for the same. I have installed trinity and py-evm now next steps for me is to create a private chain and write some ...
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99 views

smart contract and permissioned blockchain

I have some IoT(Internet of things) nodes sharing the received data from sensors with each others. I partitioned them to 2 permissioned networks: Network 1 includes: X,Y,Z nodes trusting each other. ...
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180 views

Error in mist : exceed block gas limit

I am trying to deploy a smart contract in private network using mist, but when I deploy my contract and provide transaction fee as 0.04 ether it throws error as exceeding block gas limit. Here is the ...
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392 views

Quorum 7nodes example unable to attach to geth node 1,2,4,5,6,7 but node 3 is working

Quorum 7nodes example all of sudden gave fatal error unable to attach to remote geth. Problem: can't attach to geth node Every time I import metamask account to geth node (using personal.importRawKey(...
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Ethereum geth node sync problem

I have to ethereum geth node runing as testnet syncmode=full on aws both running on same hardware and bandwidth why one is syncing very slow and other one is syncing fast? and if I will stop the ...
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Why is my private ethereum network stuck at “Recalculated downloader QoS values” while trying to mine?

I'm using Mac OS High Sierra version 10.13.6 My customgenesis.json file is this. {"config": { "chainId": 15, "homesteadBlock": 0, "eip155Block": 0, "eip158Block": 0 },"nonce": "0x0000000000000042","...
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694 views

miner.start(1) triggers but not starting the mining

I am creating my own private ethereum blockchain. sudo geth --rpcapi eth,web3,personal --rpc --networkid=15 Above command gives the below logs. INFO [09-18|10:16:42.151] Maximum peer count ...
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324 views

geth keeps quitting

I am running a geth node in a docker container for a POA private blockchain. The version of geth is Geth/v1.8.14-unstable-35fcd2f4/linux-amd64/go1.10.3. It is started using the command --networkid ...
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105 views

How to deploy contract in Mist Browser connected to Ganache?

I connected Mist to my Private Ganache Blockchain, but when I try to deploy it it gives the following error: Returned Error: Method personal sign_Transaction not supported I can deploy contracts ...
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156 views

Getting error invalid command: “networkid=15”

geth --rpcapi eth,web3,personal --rpc networkid=15 2>&1 | tee -a blockchain.log while running the above command i get following error invalid command: "networkid=15" And the same ...
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1answer
339 views

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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142 views

Cannot connect to the Web3 provider when rpccorsdomain is on

I am getting the message: Not possible to connect to the Web3 provider. Make sure the provider is running and a connection is open (via IPC or RPC). When I specify: --rpccorsdomain "http://...
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358 views

Best Method to Increase TPS on PoA Blockchain

In creating a PoA blockchain where a high TPS is needed, how will you define the genesis.json configuration? There will be sealer nodes on opposite ends of the globe with ~ 0.1-0.2 second latency. ...
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113 views

Getting sealers in POA

how to get sealers in Proof of authority network through solidity contract, like inside a contract ?
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159 views

Ethereum Block Pattern change

I want to know how block data get added to the leveldb chaindata in Ethereum . So that i can change the pattern of block. Basically i am creating my own private ethereum blockchain. And i want to add ...
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193 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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202 views

Ethereum private chain not able to addPeer

I created a private chain with my friend with exactly the same genesis block and we wanted to connect through the admin.addPeer method. The problem is that for some reason they are able to connect to ...
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351 views

Cannot send transactions to locally deployed smart contract

I setup a ethereum private network following this. Then I tried to deploy smart contract and send transaction to smart contract following this blog post. here is the python file I am using to deploy ...
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26 views

Parity Chain Spec - Require More GPU RAM?

Is there any setting on a Parity chain spec file that would allow the chain to require more than 1GB RAM to start? or to change the rate of increase per epoch? This would make a private blockchain ...
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62 views

Transactions bottleneck Geth

I have an ethereum consortium blockchain based on Azure. I've been experimenting with an application which has a very simple smart contract, but may be data intensive(?). The contracts itself, stores ...
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How to connect with different node if main node get down in private ethereum blockchain?

I have created private ethreum blockchain,It is hosted in LAN network and connected with 3 nodes, i am using one main Node IP (e.g 192.168.1.27:8546) to connect my application(created using web3.js ...
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374 views

Error: new BigNumber() not a base 16 number when use map

I am new to Solidity programming and writing smart contracts for one of the application. I test the contract on my private train: contract Proof { struct FileDetails { uint timestamp; ...
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95 views

Need help with start mining(I am getting like this)

I am new to ethereum private blockchain System information: geth version:1.8.2 os&version:linux synopsis: when i tried to connect peers to my private blockchain it showing like WARN [03-20|11:...
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73 views

Block confirmation in private chains?

How many blocks I need to wait for a confirmation on a private ethereum chain? The consensus algorithm is PoA.
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Cannot see address on geth instance console in the dev network

I am trying to develop a ethereum private network & i am using a single dev node. I startup my local dev instance of geth using this command below. geth --mine --dev --rpc --rpccorsdomain="...
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153 views

How to use bootnode in private blockchain to connect to nodes

I am trying to set 2 geth on same system to connect each other using bootnode option. I got two different folders with same genesis file then how to initilize and start geth console to see two nodes ...
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95 views

How do two nodes discover each other by a third node in a private blockchain?

I'm using geth in three different containers. Note: start a container means start geth and start mining. Each container has its ports exposed. A: -p 30303:30303 -p 8545:8545; B: -p 30304:30303 -p ...
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185 views

Not able to add ether in my private network's account

1. I have created a small ethereum private network. I opened launched the private network from terminal 1, launched the geth console from terminal 2, and opened mist browser in terminal 3. Once mist ...
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Share private data and prevent data forwarding

Let's say A has some private medical records of patients and B is a pharmaceutical company who wants to view medical records from A to find out the effect of a particular drug on the patients (run a ...
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1answer
281 views

How to connect IPC and RPC to transact fake ethers?

I have setup 2 nodes, 1 on testRPC and the other on geth(using cmd and mist). How to sync both the nodes so that I can write a crowdfunding smartcontract for the accounts in both the private nodes to ...
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892 views

Geth Private Network Unable to Add Light Node

I have a private network setup with geth and a few machines (2 full nodes for mining and a light node). The three devices have the following IPs: MINER1 - 10.42.0.40 MINER2 - 10.42.0.250 LIGHT-NODE - ...
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640 views

How to get Ethereum dashboard up and running

How to get the ethereum dashboard running, I have installed all the dependencies, following steps mentioned in https://github.com/ethereum/go-ethereum/tree/master/dashboard I followed the steps ...
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512 views

How does reward mechanism works on Proof-of-Authority consensus?

By following this tutorial. I have created a private chain based on Proof-of-Authority. Please see my CustomGenesis.json file. I have started my chain: > geth --datadir /Users/ethereum/POA/...
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Private Blockchain Reserved Nodes Disconnecting

Using Parity I have a private blockchain with 5 reserved nodes specified with --reserved-nodes /path/to/file. After a few days of conectivity, the reserved nodes stop talking to each other. It is ...
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688 views

Mist Connection Error at Private Geth Node

I've created my private network run my Geth Node as: geth --datadir /mychaindata --rpc --rpccorsdomain "*" --nodiscover I can successfully attach it and create account when I run: geth attach ipc:/...
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175 views

Python state channel client

Stumbled upon this piece of Solidity code which is an Ethereum payment channel : https://github.com/mattdf/payment-channel How am I to write a Python client that interacts with it over Web3 ? What ...
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Do nodes lose connectivity if no network activity is happening?

I have a private blockchain that seems to work great, but over 18 hours, the nodes stop talking to each other, no matter how many I start with. So they go from 25/25 connections to 0. Something I ...

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