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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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Using traditional identities on a private Ethereum blockchain & wallet-less usage

I am trying to integrate a DApp (typical solidity, web3.js setup) running on a private Ethereum blockchain with a traditional enterprise user directory (let's say Azure AD). The idea would be : at ...
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29 views

connect users to the sidechain SKALE

SKALE is Ethereum Dapps to run high speed, Low cost smart contract layer. I wish to connect users to the sidechain SKALE,from their browser. automatically without the manual change as necessary for ...
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Can Hyperledger Fabric Blockchain Supports Partial Transaction Encryption?

My use case is that we need to protect only sensitive data in the transaction in blockchain. But we want to open other data in the same transaction to the public, Can Hyperledger Fabric supports the ...
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288 views

Get RPC URL / IP of Metamask's current provider

Suppose I have multiple copies of the same dapp running on different servers which do not directly communicate with each other, for testing purposes, and can manually interact with different dapp ...
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20 views

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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127 views

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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1answer
22 views

Custom miner checks in a private chain?

I have used the ideas from the link [1]How to make miner to mine only when there are Pending Transactions? in my private chain. I have a couple of questions, - How can I add custom code on the miners ...
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2answers
60 views

Create multiple tokens and manage multiple wallets from the platform

I'm new to blockchain and Ethereum, I currently started researching about to work on a new project. I wanted to ask for advice on what should I use or what it will fits better for my use case: In my ...
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54 views

How to create an ethereum private network with proof of authtority without gas cost or gas price zero?

I want to create a private network but I don't need to use ether or gas, only I want to run smart contracts and the blockchain using ethereum technology. I find this tutorial Private proof of ...
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1answer
20 views

Is a PoW-based Ethereum private chain a permissioned blockchain?

If I creat a ethereum private chain through geth. Is the Ethereum private chain a permissioned blockchain?
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29 views

What is the philosophy behind the difficulty setting and block generating time?

We know that on the Ethereum mainnet, generating a block always costs about 15 seconds in order to maintain the synchronization. Yet, why it is set to 15 seconds but not a larger or smaller value? ...
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Unable to Synchronize raspberry pi node my private network

I have created a private network with 3 nodes - two nodes in computer and one in raspberry pi I connected computer and raspberry pi to same network through LAN computer ip: 192.168.122.1 pi ip ...
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235 views

What's problem about “gas required exceeds allowance or always failing transaction”

I translate smart contract into Java with solc and web3j, but I meet the probelm "gas required exceeds allowance or always failing transaction". This is my smart contract. It is work when I use ...
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Can read from smart contract but can't write

I have a app.js script that I am trying to use to interact with a smart contract. I can read from the contract however, I cannot write to it. The called method countMessages() returns the correct ...
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1answer
39 views

Automatically Run Contract

I have a private ethereum network made up of multiple nodes and I would like one of them to interact with the a deployed smart contract without my input. Is it possible for create a script that will ...
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1answer
41 views

How can you deploy a contract using the non-interactive mode?

I have a contract written in remix, but I am trying to deploy it using Geth's non-interactive mode using geth attach ipc:<path> -exec "<contract deploy info>". When I am in interactive ...
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114 views

Error: invalid merkle root | Error in XDPoS Consensus | fork of go-ethereum

Block Synchronisation failed in code :- https://github.com/XinFinOrg/XDPoS-TestNet-Apothem ERROR[03-23|19:47:12] #### BAD BLOCK Chain config: {ChainID: 1151 Homestead: 1 DAO: DAOSupport: false ...
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176 views

Can we do ethereum transaction for free on private blockchain

I am very new to ethereum Blockchain. Please give some suggestion regarding one query regarding gas fee. Can we do ethereum transaction and smart contract deployment for free on private blockchain ...
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1answer
44 views

Blockchain usage in smart home

I am currently gathering information for my thesis about smart home implementaton with a use of blockchain. The blockchain usage is a requirement from my thesis supervisor and I have huge problem with ...
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290 views

Deploying contract with no cost (gasPrice 0) on private network

In order to achieve a no-coin bootstrapping of my private network I'm trying to deploy a first special contract having zero funds in owner wallet (every wallet of this private network should have zero ...
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28 views

Inconsistency after restarting EthereumMiner, using AWS Blockchain Template for Ethereum

I have deployed the AWS Blockchain Template for Ethereum stack (the ECS version). There is 1 miner and 2 clients (default stack). I realized that I don't have access to the default accounts set in the ...
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22 views

Private Chain Gas Zero [duplicate]

Is there a way to make transactions costless on a private Ethereum network? I am already limiting who can interact with the deployed smart contracts and who is a member of the network with code. I ...
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111 views

Issue calling one contract from another using Quorum

I'm using truffle and running locally with 4 quorum nodes, trying to call another contract's function, but keep getting 0 in return instead of the expected value the I get once calling the contract ...
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2answers
24 views

Private Chain Peering and Port Problem

Two AWS nodes on separate machines are trying to peer. They are listening and discovering at port 30303, when I open these ports for inbound connection they are still unable to peer; but, when I open ...
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Can't add peers outside of local machine

I am able to spin up as many nodes on the same machine as I would like and have them peered in the same private blockchain network. But when I try to use addPeer() on a separate EC2 instance, I am ...
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37 views

Private blockchain losing access to older blocks

So, my private blockchain became out of sync and one of the nodes reset to block 0 – it then synced up with the other nodes. The node that went to block 0 is the node that is providing the rpc port ...
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1answer
210 views

Peers not syncing on PoA private network

I've got a private network with two PoA geth nodes, with each node running on a separate machine. One node has been running for some time (in instamine mode) and has mined 6909 blocks. I've just setup ...
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22 views

Is there a node-static.json file for swarm node?

As far as I am aware of a static-node.json is a file for P2P geth node connection on disconnect. I have tested that and It works just fine. I was, therefore, wondering if it is possible to have such a ...
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56 views

Instant Transactions: Private vs Public Blockchain

I have been developing a smart contract with solidity. My question is related to the deployment of smart contracts. I have studied and followed answers in the following links: Main Network vs Private ...
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21 views

Adding two peers in ethereum privatenet on same machine

I am trying to add two peers in ethereum privatenet but not adding its shows peer count is 0. I run the below commands Node1: geth --identity "Privatenet1" --datadir=./Privatenet1 --networkid 1995 --...
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2answers
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Create a blockchain platform to store students and its degree results on it [closed]

I would like to create a application on blockchain where i will store all students data and their results on blockchain So anyone having a idea how can i do that or is that feasible to create a that ...
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3answers
40 views

What mechanism to use to pay for viewing another users data on blockchain

I am new to blockchain development and following some tutorials I have created a DApp that allows a user to save and view information. Now, i want to let another user view that saved information but ...
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1answer
163 views

ethereum-bridge oracle on private network does not receive queries

I have a private network with a few nodes and I have installed ethereum-bridge to deploy an Oracle. One of my blockchain nodes is used by ethereum-bridge to deploy the oracle. The node is started ...
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26 views

API for private state

assume that I have a private smart contract between peers A and B using quorum blockchain. Then, the variables of the smart contract will be placed in the private state. My question is: Can I make ...
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2answers
323 views

Geth Proof of Authority Implementation

I have implemented PoA on private blockchain with following genesis.json. { "config": { "chainId": 1515, "homesteadBlock": 1, "eip150Block": 2, "eip150Hash": "...
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44 views

How to mine ether on private network with CPU?

I have a private ethereum network and connected my own pool to it. Now I want to test the mining process with my CPU, what are some the ethereum mining software that support CPU mining and stratum ...
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1answer
65 views

Private chain, metamask, accounts

I am wondering how a private chain can communicate through Metamask. My biggest concern is the HttpProvider and accounts. Aren't accounts accessed through the web3 instance? Since accounts aren't ...
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1answer
146 views

web3.eth.getAccounts() never resolves

I am attempting to connect the frontend of an application to a private chain through Metamask. As no web3 is injected, the following code is run const getWeb3 = () => ... ... ... ... const ...
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66 views

Proper number of confirmations in a small testnet

In a private blockchain with just 4 miners, what should be the proper number of confirmations? 24 is by default, but does it make sense? should it be just 4 (one per miner)?
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289 views

Modify number of confirmations

By default there are 24 confirmations but I am running a testnet with just 3 miners and I would like to change this number bucause it makes not sense to have 24. I have been checking ...
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94 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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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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1answer
26 views

Is it possible to put tax lien certificates on the blockchain?

Tax lien certificates are investment vehicles issued by a county taxing authority secured by unpaid tax liens on property. Is it possible to put these assets onto the blockchain so they can be traded ...
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23 views

Ethereum fork with Ring Signature at the core layer

Today we can have Ring Signature at the contract-level. https://github.com/HarryR/solcrypto/blob/master/contracts/UAOSRing.sol I wanted to know if there is any fork or project that would like to ...
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101 views

How to deploy a dapp which uses multiple blockchain

I am a newbie and started learning dapp on ethereum. Up till now, I wrote smart contracts; created frontend with html, css and js; deployed smart dapp on either private network(geth, ganache) or ...
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48 views

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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37 views

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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105 views

Public smart contract that calls Private contract API

In a private blockchain (e.g, quorum), assume that I have a peer X and peer Y. X has a private smart contract (A) and Y has a public smart contract B. Assume that A provides an API for Y in order to ...
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227 views

How to skip transactional nonce for private ethereum chain

We are using a private ehtereum chain on geth. It is mainly for the purpose of storing the values as part of transactions and distribute across our private network. However when we are sending ...
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314 views

how to create genesis block on ethereum?

geth --datadir ./ init customgenesis.json Fatal: Failed to read genesis file: open customgenesis.json: no such file or directory